![KAMEZAWA Hiroyuki](/assets/img/avatar_default.png)
In current page-fault code,
handle_mm_fault()
-> ...
-> mem_cgroup_charge()
-> map page or handle error.
-> check return code.
If page fault's return code is VM_FAULT_OOM, page_fault_out_of_memory() is
called. But if it's caused by memcg, OOM should have been already
invoked.
Then, I added a patch: a636b327f7
. That
patch records last_oom_jiffies for memcg's sub-hierarchy and prevents
page_fault_out_of_memory from being invoked in near future.
But Nishimura-san reported that check by jiffies is not enough when the
system is terribly heavy.
This patch changes memcg's oom logic as.
* If memcg causes OOM-kill, continue to retry.
* remove jiffies check which is used now.
* add memcg-oom-lock which works like perzone oom lock.
* If current is killed(as a process), bypass charge.
Something more sophisticated can be added but this pactch does
fundamental things.
TODO:
- add oom notifier
- add permemcg disable-oom-kill flag and freezer at oom.
- more chances for wake up oom waiter (when changing memory limit etc..)
Reviewed-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Tested-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4357 lines
110 KiB
C
4357 lines
110 KiB
C
/* memcontrol.c - Memory Controller
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*
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* Copyright IBM Corporation, 2007
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* Author Balbir Singh <balbir@linux.vnet.ibm.com>
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*
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* Copyright 2007 OpenVZ SWsoft Inc
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* Author: Pavel Emelianov <xemul@openvz.org>
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*
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* Memory thresholds
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* Copyright (C) 2009 Nokia Corporation
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* Author: Kirill A. Shutemov
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/res_counter.h>
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#include <linux/memcontrol.h>
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#include <linux/cgroup.h>
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#include <linux/mm.h>
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#include <linux/hugetlb.h>
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#include <linux/pagemap.h>
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#include <linux/smp.h>
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#include <linux/page-flags.h>
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#include <linux/backing-dev.h>
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#include <linux/bit_spinlock.h>
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#include <linux/rcupdate.h>
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#include <linux/limits.h>
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#include <linux/mutex.h>
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#include <linux/rbtree.h>
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#include <linux/slab.h>
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#include <linux/swap.h>
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#include <linux/swapops.h>
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#include <linux/spinlock.h>
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#include <linux/eventfd.h>
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#include <linux/sort.h>
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#include <linux/fs.h>
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#include <linux/seq_file.h>
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#include <linux/vmalloc.h>
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#include <linux/mm_inline.h>
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#include <linux/page_cgroup.h>
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#include <linux/cpu.h>
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#include "internal.h"
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#include <asm/uaccess.h>
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struct cgroup_subsys mem_cgroup_subsys __read_mostly;
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#define MEM_CGROUP_RECLAIM_RETRIES 5
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struct mem_cgroup *root_mem_cgroup __read_mostly;
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#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
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/* Turned on only when memory cgroup is enabled && really_do_swap_account = 1 */
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int do_swap_account __read_mostly;
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static int really_do_swap_account __initdata = 1; /* for remember boot option*/
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#else
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#define do_swap_account (0)
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#endif
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/*
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* Per memcg event counter is incremented at every pagein/pageout. This counter
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* is used for trigger some periodic events. This is straightforward and better
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* than using jiffies etc. to handle periodic memcg event.
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*
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* These values will be used as !((event) & ((1 <<(thresh)) - 1))
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*/
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#define THRESHOLDS_EVENTS_THRESH (7) /* once in 128 */
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#define SOFTLIMIT_EVENTS_THRESH (10) /* once in 1024 */
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/*
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* Statistics for memory cgroup.
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*/
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enum mem_cgroup_stat_index {
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/*
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* For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
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*/
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MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */
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MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */
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MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */
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MEM_CGROUP_STAT_PGPGIN_COUNT, /* # of pages paged in */
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MEM_CGROUP_STAT_PGPGOUT_COUNT, /* # of pages paged out */
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MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */
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MEM_CGROUP_EVENTS, /* incremented at every pagein/pageout */
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MEM_CGROUP_STAT_NSTATS,
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};
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struct mem_cgroup_stat_cpu {
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s64 count[MEM_CGROUP_STAT_NSTATS];
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};
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/*
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* per-zone information in memory controller.
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*/
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struct mem_cgroup_per_zone {
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/*
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* spin_lock to protect the per cgroup LRU
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*/
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struct list_head lists[NR_LRU_LISTS];
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unsigned long count[NR_LRU_LISTS];
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struct zone_reclaim_stat reclaim_stat;
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struct rb_node tree_node; /* RB tree node */
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unsigned long long usage_in_excess;/* Set to the value by which */
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/* the soft limit is exceeded*/
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bool on_tree;
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struct mem_cgroup *mem; /* Back pointer, we cannot */
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/* use container_of */
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};
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/* Macro for accessing counter */
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#define MEM_CGROUP_ZSTAT(mz, idx) ((mz)->count[(idx)])
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struct mem_cgroup_per_node {
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struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES];
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};
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struct mem_cgroup_lru_info {
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struct mem_cgroup_per_node *nodeinfo[MAX_NUMNODES];
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};
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/*
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* Cgroups above their limits are maintained in a RB-Tree, independent of
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* their hierarchy representation
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*/
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struct mem_cgroup_tree_per_zone {
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struct rb_root rb_root;
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spinlock_t lock;
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};
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struct mem_cgroup_tree_per_node {
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struct mem_cgroup_tree_per_zone rb_tree_per_zone[MAX_NR_ZONES];
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};
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struct mem_cgroup_tree {
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struct mem_cgroup_tree_per_node *rb_tree_per_node[MAX_NUMNODES];
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};
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static struct mem_cgroup_tree soft_limit_tree __read_mostly;
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struct mem_cgroup_threshold {
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struct eventfd_ctx *eventfd;
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u64 threshold;
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};
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struct mem_cgroup_threshold_ary {
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/* An array index points to threshold just below usage. */
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atomic_t current_threshold;
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/* Size of entries[] */
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unsigned int size;
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/* Array of thresholds */
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struct mem_cgroup_threshold entries[0];
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};
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static void mem_cgroup_threshold(struct mem_cgroup *mem);
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/*
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* The memory controller data structure. The memory controller controls both
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* page cache and RSS per cgroup. We would eventually like to provide
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* statistics based on the statistics developed by Rik Van Riel for clock-pro,
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* to help the administrator determine what knobs to tune.
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*
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* TODO: Add a water mark for the memory controller. Reclaim will begin when
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* we hit the water mark. May be even add a low water mark, such that
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* no reclaim occurs from a cgroup at it's low water mark, this is
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* a feature that will be implemented much later in the future.
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*/
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struct mem_cgroup {
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struct cgroup_subsys_state css;
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/*
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* the counter to account for memory usage
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*/
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struct res_counter res;
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/*
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* the counter to account for mem+swap usage.
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*/
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struct res_counter memsw;
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/*
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* Per cgroup active and inactive list, similar to the
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* per zone LRU lists.
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*/
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struct mem_cgroup_lru_info info;
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/*
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protect against reclaim related member.
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*/
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spinlock_t reclaim_param_lock;
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int prev_priority; /* for recording reclaim priority */
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/*
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* While reclaiming in a hierarchy, we cache the last child we
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* reclaimed from.
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*/
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int last_scanned_child;
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/*
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* Should the accounting and control be hierarchical, per subtree?
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*/
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bool use_hierarchy;
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atomic_t oom_lock;
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atomic_t refcnt;
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unsigned int swappiness;
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/* set when res.limit == memsw.limit */
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bool memsw_is_minimum;
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/* protect arrays of thresholds */
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struct mutex thresholds_lock;
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/* thresholds for memory usage. RCU-protected */
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struct mem_cgroup_threshold_ary *thresholds;
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/* thresholds for mem+swap usage. RCU-protected */
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struct mem_cgroup_threshold_ary *memsw_thresholds;
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/*
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* Should we move charges of a task when a task is moved into this
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* mem_cgroup ? And what type of charges should we move ?
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*/
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unsigned long move_charge_at_immigrate;
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/*
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* percpu counter.
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*/
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struct mem_cgroup_stat_cpu *stat;
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};
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/* Stuffs for move charges at task migration. */
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/*
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* Types of charges to be moved. "move_charge_at_immitgrate" is treated as a
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* left-shifted bitmap of these types.
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*/
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enum move_type {
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MOVE_CHARGE_TYPE_ANON, /* private anonymous page and swap of it */
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NR_MOVE_TYPE,
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};
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/* "mc" and its members are protected by cgroup_mutex */
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static struct move_charge_struct {
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struct mem_cgroup *from;
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struct mem_cgroup *to;
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unsigned long precharge;
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unsigned long moved_charge;
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unsigned long moved_swap;
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struct task_struct *moving_task; /* a task moving charges */
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wait_queue_head_t waitq; /* a waitq for other context */
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} mc = {
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.waitq = __WAIT_QUEUE_HEAD_INITIALIZER(mc.waitq),
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};
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/*
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* Maximum loops in mem_cgroup_hierarchical_reclaim(), used for soft
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* limit reclaim to prevent infinite loops, if they ever occur.
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*/
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#define MEM_CGROUP_MAX_RECLAIM_LOOPS (100)
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#define MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS (2)
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enum charge_type {
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MEM_CGROUP_CHARGE_TYPE_CACHE = 0,
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MEM_CGROUP_CHARGE_TYPE_MAPPED,
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MEM_CGROUP_CHARGE_TYPE_SHMEM, /* used by page migration of shmem */
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MEM_CGROUP_CHARGE_TYPE_FORCE, /* used by force_empty */
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MEM_CGROUP_CHARGE_TYPE_SWAPOUT, /* for accounting swapcache */
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MEM_CGROUP_CHARGE_TYPE_DROP, /* a page was unused swap cache */
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NR_CHARGE_TYPE,
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};
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/* only for here (for easy reading.) */
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#define PCGF_CACHE (1UL << PCG_CACHE)
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#define PCGF_USED (1UL << PCG_USED)
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#define PCGF_LOCK (1UL << PCG_LOCK)
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/* Not used, but added here for completeness */
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#define PCGF_ACCT (1UL << PCG_ACCT)
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/* for encoding cft->private value on file */
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#define _MEM (0)
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#define _MEMSWAP (1)
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#define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val))
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#define MEMFILE_TYPE(val) (((val) >> 16) & 0xffff)
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#define MEMFILE_ATTR(val) ((val) & 0xffff)
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/*
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* Reclaim flags for mem_cgroup_hierarchical_reclaim
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*/
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#define MEM_CGROUP_RECLAIM_NOSWAP_BIT 0x0
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#define MEM_CGROUP_RECLAIM_NOSWAP (1 << MEM_CGROUP_RECLAIM_NOSWAP_BIT)
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#define MEM_CGROUP_RECLAIM_SHRINK_BIT 0x1
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#define MEM_CGROUP_RECLAIM_SHRINK (1 << MEM_CGROUP_RECLAIM_SHRINK_BIT)
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#define MEM_CGROUP_RECLAIM_SOFT_BIT 0x2
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#define MEM_CGROUP_RECLAIM_SOFT (1 << MEM_CGROUP_RECLAIM_SOFT_BIT)
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static void mem_cgroup_get(struct mem_cgroup *mem);
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static void mem_cgroup_put(struct mem_cgroup *mem);
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static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
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static void drain_all_stock_async(void);
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static struct mem_cgroup_per_zone *
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mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid)
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{
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return &mem->info.nodeinfo[nid]->zoneinfo[zid];
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}
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struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
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{
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return &mem->css;
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}
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static struct mem_cgroup_per_zone *
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page_cgroup_zoneinfo(struct page_cgroup *pc)
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{
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struct mem_cgroup *mem = pc->mem_cgroup;
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int nid = page_cgroup_nid(pc);
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int zid = page_cgroup_zid(pc);
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if (!mem)
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return NULL;
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return mem_cgroup_zoneinfo(mem, nid, zid);
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}
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static struct mem_cgroup_tree_per_zone *
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soft_limit_tree_node_zone(int nid, int zid)
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{
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return &soft_limit_tree.rb_tree_per_node[nid]->rb_tree_per_zone[zid];
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}
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static struct mem_cgroup_tree_per_zone *
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soft_limit_tree_from_page(struct page *page)
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{
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int nid = page_to_nid(page);
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int zid = page_zonenum(page);
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return &soft_limit_tree.rb_tree_per_node[nid]->rb_tree_per_zone[zid];
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}
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static void
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__mem_cgroup_insert_exceeded(struct mem_cgroup *mem,
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struct mem_cgroup_per_zone *mz,
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struct mem_cgroup_tree_per_zone *mctz,
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unsigned long long new_usage_in_excess)
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{
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struct rb_node **p = &mctz->rb_root.rb_node;
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struct rb_node *parent = NULL;
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struct mem_cgroup_per_zone *mz_node;
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if (mz->on_tree)
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return;
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mz->usage_in_excess = new_usage_in_excess;
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if (!mz->usage_in_excess)
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return;
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while (*p) {
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parent = *p;
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mz_node = rb_entry(parent, struct mem_cgroup_per_zone,
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tree_node);
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if (mz->usage_in_excess < mz_node->usage_in_excess)
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p = &(*p)->rb_left;
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/*
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* We can't avoid mem cgroups that are over their soft
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* limit by the same amount
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*/
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else if (mz->usage_in_excess >= mz_node->usage_in_excess)
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p = &(*p)->rb_right;
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}
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rb_link_node(&mz->tree_node, parent, p);
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rb_insert_color(&mz->tree_node, &mctz->rb_root);
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mz->on_tree = true;
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}
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static void
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__mem_cgroup_remove_exceeded(struct mem_cgroup *mem,
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struct mem_cgroup_per_zone *mz,
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struct mem_cgroup_tree_per_zone *mctz)
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{
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if (!mz->on_tree)
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return;
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rb_erase(&mz->tree_node, &mctz->rb_root);
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mz->on_tree = false;
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}
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static void
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mem_cgroup_remove_exceeded(struct mem_cgroup *mem,
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struct mem_cgroup_per_zone *mz,
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struct mem_cgroup_tree_per_zone *mctz)
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{
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spin_lock(&mctz->lock);
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__mem_cgroup_remove_exceeded(mem, mz, mctz);
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spin_unlock(&mctz->lock);
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}
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static void mem_cgroup_update_tree(struct mem_cgroup *mem, struct page *page)
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{
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unsigned long long excess;
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struct mem_cgroup_per_zone *mz;
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struct mem_cgroup_tree_per_zone *mctz;
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int nid = page_to_nid(page);
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int zid = page_zonenum(page);
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mctz = soft_limit_tree_from_page(page);
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/*
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* Necessary to update all ancestors when hierarchy is used.
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* because their event counter is not touched.
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*/
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for (; mem; mem = parent_mem_cgroup(mem)) {
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mz = mem_cgroup_zoneinfo(mem, nid, zid);
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excess = res_counter_soft_limit_excess(&mem->res);
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/*
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* We have to update the tree if mz is on RB-tree or
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* mem is over its softlimit.
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*/
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if (excess || mz->on_tree) {
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spin_lock(&mctz->lock);
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/* if on-tree, remove it */
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if (mz->on_tree)
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__mem_cgroup_remove_exceeded(mem, mz, mctz);
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/*
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* Insert again. mz->usage_in_excess will be updated.
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* If excess is 0, no tree ops.
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*/
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__mem_cgroup_insert_exceeded(mem, mz, mctz, excess);
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spin_unlock(&mctz->lock);
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}
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}
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}
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static void mem_cgroup_remove_from_trees(struct mem_cgroup *mem)
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{
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int node, zone;
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struct mem_cgroup_per_zone *mz;
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struct mem_cgroup_tree_per_zone *mctz;
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for_each_node_state(node, N_POSSIBLE) {
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for (zone = 0; zone < MAX_NR_ZONES; zone++) {
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mz = mem_cgroup_zoneinfo(mem, node, zone);
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mctz = soft_limit_tree_node_zone(node, zone);
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mem_cgroup_remove_exceeded(mem, mz, mctz);
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}
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}
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}
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static inline unsigned long mem_cgroup_get_excess(struct mem_cgroup *mem)
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{
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return res_counter_soft_limit_excess(&mem->res) >> PAGE_SHIFT;
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}
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static struct mem_cgroup_per_zone *
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__mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz)
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{
|
|
struct rb_node *rightmost = NULL;
|
|
struct mem_cgroup_per_zone *mz;
|
|
|
|
retry:
|
|
mz = NULL;
|
|
rightmost = rb_last(&mctz->rb_root);
|
|
if (!rightmost)
|
|
goto done; /* Nothing to reclaim from */
|
|
|
|
mz = rb_entry(rightmost, struct mem_cgroup_per_zone, tree_node);
|
|
/*
|
|
* Remove the node now but someone else can add it back,
|
|
* we will to add it back at the end of reclaim to its correct
|
|
* position in the tree.
|
|
*/
|
|
__mem_cgroup_remove_exceeded(mz->mem, mz, mctz);
|
|
if (!res_counter_soft_limit_excess(&mz->mem->res) ||
|
|
!css_tryget(&mz->mem->css))
|
|
goto retry;
|
|
done:
|
|
return mz;
|
|
}
|
|
|
|
static struct mem_cgroup_per_zone *
|
|
mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz)
|
|
{
|
|
struct mem_cgroup_per_zone *mz;
|
|
|
|
spin_lock(&mctz->lock);
|
|
mz = __mem_cgroup_largest_soft_limit_node(mctz);
|
|
spin_unlock(&mctz->lock);
|
|
return mz;
|
|
}
|
|
|
|
static s64 mem_cgroup_read_stat(struct mem_cgroup *mem,
|
|
enum mem_cgroup_stat_index idx)
|
|
{
|
|
int cpu;
|
|
s64 val = 0;
|
|
|
|
for_each_possible_cpu(cpu)
|
|
val += per_cpu(mem->stat->count[idx], cpu);
|
|
return val;
|
|
}
|
|
|
|
static s64 mem_cgroup_local_usage(struct mem_cgroup *mem)
|
|
{
|
|
s64 ret;
|
|
|
|
ret = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_RSS);
|
|
ret += mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_CACHE);
|
|
return ret;
|
|
}
|
|
|
|
static void mem_cgroup_swap_statistics(struct mem_cgroup *mem,
|
|
bool charge)
|
|
{
|
|
int val = (charge) ? 1 : -1;
|
|
this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_SWAPOUT], val);
|
|
}
|
|
|
|
static void mem_cgroup_charge_statistics(struct mem_cgroup *mem,
|
|
struct page_cgroup *pc,
|
|
bool charge)
|
|
{
|
|
int val = (charge) ? 1 : -1;
|
|
|
|
preempt_disable();
|
|
|
|
if (PageCgroupCache(pc))
|
|
__this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_CACHE], val);
|
|
else
|
|
__this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_RSS], val);
|
|
|
|
if (charge)
|
|
__this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_PGPGIN_COUNT]);
|
|
else
|
|
__this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_PGPGOUT_COUNT]);
|
|
__this_cpu_inc(mem->stat->count[MEM_CGROUP_EVENTS]);
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
static unsigned long mem_cgroup_get_local_zonestat(struct mem_cgroup *mem,
|
|
enum lru_list idx)
|
|
{
|
|
int nid, zid;
|
|
struct mem_cgroup_per_zone *mz;
|
|
u64 total = 0;
|
|
|
|
for_each_online_node(nid)
|
|
for (zid = 0; zid < MAX_NR_ZONES; zid++) {
|
|
mz = mem_cgroup_zoneinfo(mem, nid, zid);
|
|
total += MEM_CGROUP_ZSTAT(mz, idx);
|
|
}
|
|
return total;
|
|
}
|
|
|
|
static bool __memcg_event_check(struct mem_cgroup *mem, int event_mask_shift)
|
|
{
|
|
s64 val;
|
|
|
|
val = this_cpu_read(mem->stat->count[MEM_CGROUP_EVENTS]);
|
|
|
|
return !(val & ((1 << event_mask_shift) - 1));
|
|
}
|
|
|
|
/*
|
|
* Check events in order.
|
|
*
|
|
*/
|
|
static void memcg_check_events(struct mem_cgroup *mem, struct page *page)
|
|
{
|
|
/* threshold event is triggered in finer grain than soft limit */
|
|
if (unlikely(__memcg_event_check(mem, THRESHOLDS_EVENTS_THRESH))) {
|
|
mem_cgroup_threshold(mem);
|
|
if (unlikely(__memcg_event_check(mem, SOFTLIMIT_EVENTS_THRESH)))
|
|
mem_cgroup_update_tree(mem, page);
|
|
}
|
|
}
|
|
|
|
static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont)
|
|
{
|
|
return container_of(cgroup_subsys_state(cont,
|
|
mem_cgroup_subsys_id), struct mem_cgroup,
|
|
css);
|
|
}
|
|
|
|
struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
|
|
{
|
|
/*
|
|
* mm_update_next_owner() may clear mm->owner to NULL
|
|
* if it races with swapoff, page migration, etc.
|
|
* So this can be called with p == NULL.
|
|
*/
|
|
if (unlikely(!p))
|
|
return NULL;
|
|
|
|
return container_of(task_subsys_state(p, mem_cgroup_subsys_id),
|
|
struct mem_cgroup, css);
|
|
}
|
|
|
|
static struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
|
|
{
|
|
struct mem_cgroup *mem = NULL;
|
|
|
|
if (!mm)
|
|
return NULL;
|
|
/*
|
|
* Because we have no locks, mm->owner's may be being moved to other
|
|
* cgroup. We use css_tryget() here even if this looks
|
|
* pessimistic (rather than adding locks here).
|
|
*/
|
|
rcu_read_lock();
|
|
do {
|
|
mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
|
|
if (unlikely(!mem))
|
|
break;
|
|
} while (!css_tryget(&mem->css));
|
|
rcu_read_unlock();
|
|
return mem;
|
|
}
|
|
|
|
/*
|
|
* Call callback function against all cgroup under hierarchy tree.
|
|
*/
|
|
static int mem_cgroup_walk_tree(struct mem_cgroup *root, void *data,
|
|
int (*func)(struct mem_cgroup *, void *))
|
|
{
|
|
int found, ret, nextid;
|
|
struct cgroup_subsys_state *css;
|
|
struct mem_cgroup *mem;
|
|
|
|
if (!root->use_hierarchy)
|
|
return (*func)(root, data);
|
|
|
|
nextid = 1;
|
|
do {
|
|
ret = 0;
|
|
mem = NULL;
|
|
|
|
rcu_read_lock();
|
|
css = css_get_next(&mem_cgroup_subsys, nextid, &root->css,
|
|
&found);
|
|
if (css && css_tryget(css))
|
|
mem = container_of(css, struct mem_cgroup, css);
|
|
rcu_read_unlock();
|
|
|
|
if (mem) {
|
|
ret = (*func)(mem, data);
|
|
css_put(&mem->css);
|
|
}
|
|
nextid = found + 1;
|
|
} while (!ret && css);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline bool mem_cgroup_is_root(struct mem_cgroup *mem)
|
|
{
|
|
return (mem == root_mem_cgroup);
|
|
}
|
|
|
|
/*
|
|
* Following LRU functions are allowed to be used without PCG_LOCK.
|
|
* Operations are called by routine of global LRU independently from memcg.
|
|
* What we have to take care of here is validness of pc->mem_cgroup.
|
|
*
|
|
* Changes to pc->mem_cgroup happens when
|
|
* 1. charge
|
|
* 2. moving account
|
|
* In typical case, "charge" is done before add-to-lru. Exception is SwapCache.
|
|
* It is added to LRU before charge.
|
|
* If PCG_USED bit is not set, page_cgroup is not added to this private LRU.
|
|
* When moving account, the page is not on LRU. It's isolated.
|
|
*/
|
|
|
|
void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru)
|
|
{
|
|
struct page_cgroup *pc;
|
|
struct mem_cgroup_per_zone *mz;
|
|
|
|
if (mem_cgroup_disabled())
|
|
return;
|
|
pc = lookup_page_cgroup(page);
|
|
/* can happen while we handle swapcache. */
|
|
if (!TestClearPageCgroupAcctLRU(pc))
|
|
return;
|
|
VM_BUG_ON(!pc->mem_cgroup);
|
|
/*
|
|
* We don't check PCG_USED bit. It's cleared when the "page" is finally
|
|
* removed from global LRU.
|
|
*/
|
|
mz = page_cgroup_zoneinfo(pc);
|
|
MEM_CGROUP_ZSTAT(mz, lru) -= 1;
|
|
if (mem_cgroup_is_root(pc->mem_cgroup))
|
|
return;
|
|
VM_BUG_ON(list_empty(&pc->lru));
|
|
list_del_init(&pc->lru);
|
|
return;
|
|
}
|
|
|
|
void mem_cgroup_del_lru(struct page *page)
|
|
{
|
|
mem_cgroup_del_lru_list(page, page_lru(page));
|
|
}
|
|
|
|
void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru)
|
|
{
|
|
struct mem_cgroup_per_zone *mz;
|
|
struct page_cgroup *pc;
|
|
|
|
if (mem_cgroup_disabled())
|
|
return;
|
|
|
|
pc = lookup_page_cgroup(page);
|
|
/*
|
|
* Used bit is set without atomic ops but after smp_wmb().
|
|
* For making pc->mem_cgroup visible, insert smp_rmb() here.
|
|
*/
|
|
smp_rmb();
|
|
/* unused or root page is not rotated. */
|
|
if (!PageCgroupUsed(pc) || mem_cgroup_is_root(pc->mem_cgroup))
|
|
return;
|
|
mz = page_cgroup_zoneinfo(pc);
|
|
list_move(&pc->lru, &mz->lists[lru]);
|
|
}
|
|
|
|
void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru)
|
|
{
|
|
struct page_cgroup *pc;
|
|
struct mem_cgroup_per_zone *mz;
|
|
|
|
if (mem_cgroup_disabled())
|
|
return;
|
|
pc = lookup_page_cgroup(page);
|
|
VM_BUG_ON(PageCgroupAcctLRU(pc));
|
|
/*
|
|
* Used bit is set without atomic ops but after smp_wmb().
|
|
* For making pc->mem_cgroup visible, insert smp_rmb() here.
|
|
*/
|
|
smp_rmb();
|
|
if (!PageCgroupUsed(pc))
|
|
return;
|
|
|
|
mz = page_cgroup_zoneinfo(pc);
|
|
MEM_CGROUP_ZSTAT(mz, lru) += 1;
|
|
SetPageCgroupAcctLRU(pc);
|
|
if (mem_cgroup_is_root(pc->mem_cgroup))
|
|
return;
|
|
list_add(&pc->lru, &mz->lists[lru]);
|
|
}
|
|
|
|
/*
|
|
* At handling SwapCache, pc->mem_cgroup may be changed while it's linked to
|
|
* lru because the page may.be reused after it's fully uncharged (because of
|
|
* SwapCache behavior).To handle that, unlink page_cgroup from LRU when charge
|
|
* it again. This function is only used to charge SwapCache. It's done under
|
|
* lock_page and expected that zone->lru_lock is never held.
|
|
*/
|
|
static void mem_cgroup_lru_del_before_commit_swapcache(struct page *page)
|
|
{
|
|
unsigned long flags;
|
|
struct zone *zone = page_zone(page);
|
|
struct page_cgroup *pc = lookup_page_cgroup(page);
|
|
|
|
spin_lock_irqsave(&zone->lru_lock, flags);
|
|
/*
|
|
* Forget old LRU when this page_cgroup is *not* used. This Used bit
|
|
* is guarded by lock_page() because the page is SwapCache.
|
|
*/
|
|
if (!PageCgroupUsed(pc))
|
|
mem_cgroup_del_lru_list(page, page_lru(page));
|
|
spin_unlock_irqrestore(&zone->lru_lock, flags);
|
|
}
|
|
|
|
static void mem_cgroup_lru_add_after_commit_swapcache(struct page *page)
|
|
{
|
|
unsigned long flags;
|
|
struct zone *zone = page_zone(page);
|
|
struct page_cgroup *pc = lookup_page_cgroup(page);
|
|
|
|
spin_lock_irqsave(&zone->lru_lock, flags);
|
|
/* link when the page is linked to LRU but page_cgroup isn't */
|
|
if (PageLRU(page) && !PageCgroupAcctLRU(pc))
|
|
mem_cgroup_add_lru_list(page, page_lru(page));
|
|
spin_unlock_irqrestore(&zone->lru_lock, flags);
|
|
}
|
|
|
|
|
|
void mem_cgroup_move_lists(struct page *page,
|
|
enum lru_list from, enum lru_list to)
|
|
{
|
|
if (mem_cgroup_disabled())
|
|
return;
|
|
mem_cgroup_del_lru_list(page, from);
|
|
mem_cgroup_add_lru_list(page, to);
|
|
}
|
|
|
|
int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
|
|
{
|
|
int ret;
|
|
struct mem_cgroup *curr = NULL;
|
|
|
|
task_lock(task);
|
|
rcu_read_lock();
|
|
curr = try_get_mem_cgroup_from_mm(task->mm);
|
|
rcu_read_unlock();
|
|
task_unlock(task);
|
|
if (!curr)
|
|
return 0;
|
|
/*
|
|
* We should check use_hierarchy of "mem" not "curr". Because checking
|
|
* use_hierarchy of "curr" here make this function true if hierarchy is
|
|
* enabled in "curr" and "curr" is a child of "mem" in *cgroup*
|
|
* hierarchy(even if use_hierarchy is disabled in "mem").
|
|
*/
|
|
if (mem->use_hierarchy)
|
|
ret = css_is_ancestor(&curr->css, &mem->css);
|
|
else
|
|
ret = (curr == mem);
|
|
css_put(&curr->css);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* prev_priority control...this will be used in memory reclaim path.
|
|
*/
|
|
int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
|
|
{
|
|
int prev_priority;
|
|
|
|
spin_lock(&mem->reclaim_param_lock);
|
|
prev_priority = mem->prev_priority;
|
|
spin_unlock(&mem->reclaim_param_lock);
|
|
|
|
return prev_priority;
|
|
}
|
|
|
|
void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, int priority)
|
|
{
|
|
spin_lock(&mem->reclaim_param_lock);
|
|
if (priority < mem->prev_priority)
|
|
mem->prev_priority = priority;
|
|
spin_unlock(&mem->reclaim_param_lock);
|
|
}
|
|
|
|
void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, int priority)
|
|
{
|
|
spin_lock(&mem->reclaim_param_lock);
|
|
mem->prev_priority = priority;
|
|
spin_unlock(&mem->reclaim_param_lock);
|
|
}
|
|
|
|
static int calc_inactive_ratio(struct mem_cgroup *memcg, unsigned long *present_pages)
|
|
{
|
|
unsigned long active;
|
|
unsigned long inactive;
|
|
unsigned long gb;
|
|
unsigned long inactive_ratio;
|
|
|
|
inactive = mem_cgroup_get_local_zonestat(memcg, LRU_INACTIVE_ANON);
|
|
active = mem_cgroup_get_local_zonestat(memcg, LRU_ACTIVE_ANON);
|
|
|
|
gb = (inactive + active) >> (30 - PAGE_SHIFT);
|
|
if (gb)
|
|
inactive_ratio = int_sqrt(10 * gb);
|
|
else
|
|
inactive_ratio = 1;
|
|
|
|
if (present_pages) {
|
|
present_pages[0] = inactive;
|
|
present_pages[1] = active;
|
|
}
|
|
|
|
return inactive_ratio;
|
|
}
|
|
|
|
int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
|
|
{
|
|
unsigned long active;
|
|
unsigned long inactive;
|
|
unsigned long present_pages[2];
|
|
unsigned long inactive_ratio;
|
|
|
|
inactive_ratio = calc_inactive_ratio(memcg, present_pages);
|
|
|
|
inactive = present_pages[0];
|
|
active = present_pages[1];
|
|
|
|
if (inactive * inactive_ratio < active)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
|
|
{
|
|
unsigned long active;
|
|
unsigned long inactive;
|
|
|
|
inactive = mem_cgroup_get_local_zonestat(memcg, LRU_INACTIVE_FILE);
|
|
active = mem_cgroup_get_local_zonestat(memcg, LRU_ACTIVE_FILE);
|
|
|
|
return (active > inactive);
|
|
}
|
|
|
|
unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
|
|
struct zone *zone,
|
|
enum lru_list lru)
|
|
{
|
|
int nid = zone->zone_pgdat->node_id;
|
|
int zid = zone_idx(zone);
|
|
struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid);
|
|
|
|
return MEM_CGROUP_ZSTAT(mz, lru);
|
|
}
|
|
|
|
struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
|
|
struct zone *zone)
|
|
{
|
|
int nid = zone->zone_pgdat->node_id;
|
|
int zid = zone_idx(zone);
|
|
struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid);
|
|
|
|
return &mz->reclaim_stat;
|
|
}
|
|
|
|
struct zone_reclaim_stat *
|
|
mem_cgroup_get_reclaim_stat_from_page(struct page *page)
|
|
{
|
|
struct page_cgroup *pc;
|
|
struct mem_cgroup_per_zone *mz;
|
|
|
|
if (mem_cgroup_disabled())
|
|
return NULL;
|
|
|
|
pc = lookup_page_cgroup(page);
|
|
/*
|
|
* Used bit is set without atomic ops but after smp_wmb().
|
|
* For making pc->mem_cgroup visible, insert smp_rmb() here.
|
|
*/
|
|
smp_rmb();
|
|
if (!PageCgroupUsed(pc))
|
|
return NULL;
|
|
|
|
mz = page_cgroup_zoneinfo(pc);
|
|
if (!mz)
|
|
return NULL;
|
|
|
|
return &mz->reclaim_stat;
|
|
}
|
|
|
|
unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
|
|
struct list_head *dst,
|
|
unsigned long *scanned, int order,
|
|
int mode, struct zone *z,
|
|
struct mem_cgroup *mem_cont,
|
|
int active, int file)
|
|
{
|
|
unsigned long nr_taken = 0;
|
|
struct page *page;
|
|
unsigned long scan;
|
|
LIST_HEAD(pc_list);
|
|
struct list_head *src;
|
|
struct page_cgroup *pc, *tmp;
|
|
int nid = z->zone_pgdat->node_id;
|
|
int zid = zone_idx(z);
|
|
struct mem_cgroup_per_zone *mz;
|
|
int lru = LRU_FILE * file + active;
|
|
int ret;
|
|
|
|
BUG_ON(!mem_cont);
|
|
mz = mem_cgroup_zoneinfo(mem_cont, nid, zid);
|
|
src = &mz->lists[lru];
|
|
|
|
scan = 0;
|
|
list_for_each_entry_safe_reverse(pc, tmp, src, lru) {
|
|
if (scan >= nr_to_scan)
|
|
break;
|
|
|
|
page = pc->page;
|
|
if (unlikely(!PageCgroupUsed(pc)))
|
|
continue;
|
|
if (unlikely(!PageLRU(page)))
|
|
continue;
|
|
|
|
scan++;
|
|
ret = __isolate_lru_page(page, mode, file);
|
|
switch (ret) {
|
|
case 0:
|
|
list_move(&page->lru, dst);
|
|
mem_cgroup_del_lru(page);
|
|
nr_taken++;
|
|
break;
|
|
case -EBUSY:
|
|
/* we don't affect global LRU but rotate in our LRU */
|
|
mem_cgroup_rotate_lru_list(page, page_lru(page));
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
*scanned = scan;
|
|
return nr_taken;
|
|
}
|
|
|
|
#define mem_cgroup_from_res_counter(counter, member) \
|
|
container_of(counter, struct mem_cgroup, member)
|
|
|
|
static bool mem_cgroup_check_under_limit(struct mem_cgroup *mem)
|
|
{
|
|
if (do_swap_account) {
|
|
if (res_counter_check_under_limit(&mem->res) &&
|
|
res_counter_check_under_limit(&mem->memsw))
|
|
return true;
|
|
} else
|
|
if (res_counter_check_under_limit(&mem->res))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static unsigned int get_swappiness(struct mem_cgroup *memcg)
|
|
{
|
|
struct cgroup *cgrp = memcg->css.cgroup;
|
|
unsigned int swappiness;
|
|
|
|
/* root ? */
|
|
if (cgrp->parent == NULL)
|
|
return vm_swappiness;
|
|
|
|
spin_lock(&memcg->reclaim_param_lock);
|
|
swappiness = memcg->swappiness;
|
|
spin_unlock(&memcg->reclaim_param_lock);
|
|
|
|
return swappiness;
|
|
}
|
|
|
|
static int mem_cgroup_count_children_cb(struct mem_cgroup *mem, void *data)
|
|
{
|
|
int *val = data;
|
|
(*val)++;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mem_cgroup_print_oom_info: Called from OOM with tasklist_lock held in read mode.
|
|
* @memcg: The memory cgroup that went over limit
|
|
* @p: Task that is going to be killed
|
|
*
|
|
* NOTE: @memcg and @p's mem_cgroup can be different when hierarchy is
|
|
* enabled
|
|
*/
|
|
void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
|
|
{
|
|
struct cgroup *task_cgrp;
|
|
struct cgroup *mem_cgrp;
|
|
/*
|
|
* Need a buffer in BSS, can't rely on allocations. The code relies
|
|
* on the assumption that OOM is serialized for memory controller.
|
|
* If this assumption is broken, revisit this code.
|
|
*/
|
|
static char memcg_name[PATH_MAX];
|
|
int ret;
|
|
|
|
if (!memcg || !p)
|
|
return;
|
|
|
|
|
|
rcu_read_lock();
|
|
|
|
mem_cgrp = memcg->css.cgroup;
|
|
task_cgrp = task_cgroup(p, mem_cgroup_subsys_id);
|
|
|
|
ret = cgroup_path(task_cgrp, memcg_name, PATH_MAX);
|
|
if (ret < 0) {
|
|
/*
|
|
* Unfortunately, we are unable to convert to a useful name
|
|
* But we'll still print out the usage information
|
|
*/
|
|
rcu_read_unlock();
|
|
goto done;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
printk(KERN_INFO "Task in %s killed", memcg_name);
|
|
|
|
rcu_read_lock();
|
|
ret = cgroup_path(mem_cgrp, memcg_name, PATH_MAX);
|
|
if (ret < 0) {
|
|
rcu_read_unlock();
|
|
goto done;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
/*
|
|
* Continues from above, so we don't need an KERN_ level
|
|
*/
|
|
printk(KERN_CONT " as a result of limit of %s\n", memcg_name);
|
|
done:
|
|
|
|
printk(KERN_INFO "memory: usage %llukB, limit %llukB, failcnt %llu\n",
|
|
res_counter_read_u64(&memcg->res, RES_USAGE) >> 10,
|
|
res_counter_read_u64(&memcg->res, RES_LIMIT) >> 10,
|
|
res_counter_read_u64(&memcg->res, RES_FAILCNT));
|
|
printk(KERN_INFO "memory+swap: usage %llukB, limit %llukB, "
|
|
"failcnt %llu\n",
|
|
res_counter_read_u64(&memcg->memsw, RES_USAGE) >> 10,
|
|
res_counter_read_u64(&memcg->memsw, RES_LIMIT) >> 10,
|
|
res_counter_read_u64(&memcg->memsw, RES_FAILCNT));
|
|
}
|
|
|
|
/*
|
|
* This function returns the number of memcg under hierarchy tree. Returns
|
|
* 1(self count) if no children.
|
|
*/
|
|
static int mem_cgroup_count_children(struct mem_cgroup *mem)
|
|
{
|
|
int num = 0;
|
|
mem_cgroup_walk_tree(mem, &num, mem_cgroup_count_children_cb);
|
|
return num;
|
|
}
|
|
|
|
/*
|
|
* Visit the first child (need not be the first child as per the ordering
|
|
* of the cgroup list, since we track last_scanned_child) of @mem and use
|
|
* that to reclaim free pages from.
|
|
*/
|
|
static struct mem_cgroup *
|
|
mem_cgroup_select_victim(struct mem_cgroup *root_mem)
|
|
{
|
|
struct mem_cgroup *ret = NULL;
|
|
struct cgroup_subsys_state *css;
|
|
int nextid, found;
|
|
|
|
if (!root_mem->use_hierarchy) {
|
|
css_get(&root_mem->css);
|
|
ret = root_mem;
|
|
}
|
|
|
|
while (!ret) {
|
|
rcu_read_lock();
|
|
nextid = root_mem->last_scanned_child + 1;
|
|
css = css_get_next(&mem_cgroup_subsys, nextid, &root_mem->css,
|
|
&found);
|
|
if (css && css_tryget(css))
|
|
ret = container_of(css, struct mem_cgroup, css);
|
|
|
|
rcu_read_unlock();
|
|
/* Updates scanning parameter */
|
|
spin_lock(&root_mem->reclaim_param_lock);
|
|
if (!css) {
|
|
/* this means start scan from ID:1 */
|
|
root_mem->last_scanned_child = 0;
|
|
} else
|
|
root_mem->last_scanned_child = found;
|
|
spin_unlock(&root_mem->reclaim_param_lock);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Scan the hierarchy if needed to reclaim memory. We remember the last child
|
|
* we reclaimed from, so that we don't end up penalizing one child extensively
|
|
* based on its position in the children list.
|
|
*
|
|
* root_mem is the original ancestor that we've been reclaim from.
|
|
*
|
|
* We give up and return to the caller when we visit root_mem twice.
|
|
* (other groups can be removed while we're walking....)
|
|
*
|
|
* If shrink==true, for avoiding to free too much, this returns immedieately.
|
|
*/
|
|
static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
|
|
struct zone *zone,
|
|
gfp_t gfp_mask,
|
|
unsigned long reclaim_options)
|
|
{
|
|
struct mem_cgroup *victim;
|
|
int ret, total = 0;
|
|
int loop = 0;
|
|
bool noswap = reclaim_options & MEM_CGROUP_RECLAIM_NOSWAP;
|
|
bool shrink = reclaim_options & MEM_CGROUP_RECLAIM_SHRINK;
|
|
bool check_soft = reclaim_options & MEM_CGROUP_RECLAIM_SOFT;
|
|
unsigned long excess = mem_cgroup_get_excess(root_mem);
|
|
|
|
/* If memsw_is_minimum==1, swap-out is of-no-use. */
|
|
if (root_mem->memsw_is_minimum)
|
|
noswap = true;
|
|
|
|
while (1) {
|
|
victim = mem_cgroup_select_victim(root_mem);
|
|
if (victim == root_mem) {
|
|
loop++;
|
|
if (loop >= 1)
|
|
drain_all_stock_async();
|
|
if (loop >= 2) {
|
|
/*
|
|
* If we have not been able to reclaim
|
|
* anything, it might because there are
|
|
* no reclaimable pages under this hierarchy
|
|
*/
|
|
if (!check_soft || !total) {
|
|
css_put(&victim->css);
|
|
break;
|
|
}
|
|
/*
|
|
* We want to do more targetted reclaim.
|
|
* excess >> 2 is not to excessive so as to
|
|
* reclaim too much, nor too less that we keep
|
|
* coming back to reclaim from this cgroup
|
|
*/
|
|
if (total >= (excess >> 2) ||
|
|
(loop > MEM_CGROUP_MAX_RECLAIM_LOOPS)) {
|
|
css_put(&victim->css);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (!mem_cgroup_local_usage(victim)) {
|
|
/* this cgroup's local usage == 0 */
|
|
css_put(&victim->css);
|
|
continue;
|
|
}
|
|
/* we use swappiness of local cgroup */
|
|
if (check_soft)
|
|
ret = mem_cgroup_shrink_node_zone(victim, gfp_mask,
|
|
noswap, get_swappiness(victim), zone,
|
|
zone->zone_pgdat->node_id);
|
|
else
|
|
ret = try_to_free_mem_cgroup_pages(victim, gfp_mask,
|
|
noswap, get_swappiness(victim));
|
|
css_put(&victim->css);
|
|
/*
|
|
* At shrinking usage, we can't check we should stop here or
|
|
* reclaim more. It's depends on callers. last_scanned_child
|
|
* will work enough for keeping fairness under tree.
|
|
*/
|
|
if (shrink)
|
|
return ret;
|
|
total += ret;
|
|
if (check_soft) {
|
|
if (res_counter_check_under_soft_limit(&root_mem->res))
|
|
return total;
|
|
} else if (mem_cgroup_check_under_limit(root_mem))
|
|
return 1 + total;
|
|
}
|
|
return total;
|
|
}
|
|
|
|
static int mem_cgroup_oom_lock_cb(struct mem_cgroup *mem, void *data)
|
|
{
|
|
int *val = (int *)data;
|
|
int x;
|
|
/*
|
|
* Logically, we can stop scanning immediately when we find
|
|
* a memcg is already locked. But condidering unlock ops and
|
|
* creation/removal of memcg, scan-all is simple operation.
|
|
*/
|
|
x = atomic_inc_return(&mem->oom_lock);
|
|
*val = max(x, *val);
|
|
return 0;
|
|
}
|
|
/*
|
|
* Check OOM-Killer is already running under our hierarchy.
|
|
* If someone is running, return false.
|
|
*/
|
|
static bool mem_cgroup_oom_lock(struct mem_cgroup *mem)
|
|
{
|
|
int lock_count = 0;
|
|
|
|
mem_cgroup_walk_tree(mem, &lock_count, mem_cgroup_oom_lock_cb);
|
|
|
|
if (lock_count == 1)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static int mem_cgroup_oom_unlock_cb(struct mem_cgroup *mem, void *data)
|
|
{
|
|
/*
|
|
* When a new child is created while the hierarchy is under oom,
|
|
* mem_cgroup_oom_lock() may not be called. We have to use
|
|
* atomic_add_unless() here.
|
|
*/
|
|
atomic_add_unless(&mem->oom_lock, -1, 0);
|
|
return 0;
|
|
}
|
|
|
|
static void mem_cgroup_oom_unlock(struct mem_cgroup *mem)
|
|
{
|
|
mem_cgroup_walk_tree(mem, NULL, mem_cgroup_oom_unlock_cb);
|
|
}
|
|
|
|
static DEFINE_MUTEX(memcg_oom_mutex);
|
|
static DECLARE_WAIT_QUEUE_HEAD(memcg_oom_waitq);
|
|
|
|
/*
|
|
* try to call OOM killer. returns false if we should exit memory-reclaim loop.
|
|
*/
|
|
bool mem_cgroup_handle_oom(struct mem_cgroup *mem, gfp_t mask)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
bool locked;
|
|
|
|
/* At first, try to OOM lock hierarchy under mem.*/
|
|
mutex_lock(&memcg_oom_mutex);
|
|
locked = mem_cgroup_oom_lock(mem);
|
|
/*
|
|
* Even if signal_pending(), we can't quit charge() loop without
|
|
* accounting. So, UNINTERRUPTIBLE is appropriate. But SIGKILL
|
|
* under OOM is always welcomed, use TASK_KILLABLE here.
|
|
*/
|
|
if (!locked)
|
|
prepare_to_wait(&memcg_oom_waitq, &wait, TASK_KILLABLE);
|
|
mutex_unlock(&memcg_oom_mutex);
|
|
|
|
if (locked)
|
|
mem_cgroup_out_of_memory(mem, mask);
|
|
else {
|
|
schedule();
|
|
finish_wait(&memcg_oom_waitq, &wait);
|
|
}
|
|
mutex_lock(&memcg_oom_mutex);
|
|
mem_cgroup_oom_unlock(mem);
|
|
/*
|
|
* Here, we use global waitq .....more fine grained waitq ?
|
|
* Assume following hierarchy.
|
|
* A/
|
|
* 01
|
|
* 02
|
|
* assume OOM happens both in A and 01 at the same time. Tthey are
|
|
* mutually exclusive by lock. (kill in 01 helps A.)
|
|
* When we use per memcg waitq, we have to wake up waiters on A and 02
|
|
* in addtion to waiters on 01. We use global waitq for avoiding mess.
|
|
* It will not be a big problem.
|
|
* (And a task may be moved to other groups while it's waiting for OOM.)
|
|
*/
|
|
wake_up_all(&memcg_oom_waitq);
|
|
mutex_unlock(&memcg_oom_mutex);
|
|
|
|
if (test_thread_flag(TIF_MEMDIE) || fatal_signal_pending(current))
|
|
return false;
|
|
/* Give chance to dying process */
|
|
schedule_timeout(1);
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Currently used to update mapped file statistics, but the routine can be
|
|
* generalized to update other statistics as well.
|
|
*/
|
|
void mem_cgroup_update_file_mapped(struct page *page, int val)
|
|
{
|
|
struct mem_cgroup *mem;
|
|
struct page_cgroup *pc;
|
|
|
|
pc = lookup_page_cgroup(page);
|
|
if (unlikely(!pc))
|
|
return;
|
|
|
|
lock_page_cgroup(pc);
|
|
mem = pc->mem_cgroup;
|
|
if (!mem)
|
|
goto done;
|
|
|
|
if (!PageCgroupUsed(pc))
|
|
goto done;
|
|
|
|
/*
|
|
* Preemption is already disabled. We can use __this_cpu_xxx
|
|
*/
|
|
__this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED], val);
|
|
|
|
done:
|
|
unlock_page_cgroup(pc);
|
|
}
|
|
|
|
/*
|
|
* size of first charge trial. "32" comes from vmscan.c's magic value.
|
|
* TODO: maybe necessary to use big numbers in big irons.
|
|
*/
|
|
#define CHARGE_SIZE (32 * PAGE_SIZE)
|
|
struct memcg_stock_pcp {
|
|
struct mem_cgroup *cached; /* this never be root cgroup */
|
|
int charge;
|
|
struct work_struct work;
|
|
};
|
|
static DEFINE_PER_CPU(struct memcg_stock_pcp, memcg_stock);
|
|
static atomic_t memcg_drain_count;
|
|
|
|
/*
|
|
* Try to consume stocked charge on this cpu. If success, PAGE_SIZE is consumed
|
|
* from local stock and true is returned. If the stock is 0 or charges from a
|
|
* cgroup which is not current target, returns false. This stock will be
|
|
* refilled.
|
|
*/
|
|
static bool consume_stock(struct mem_cgroup *mem)
|
|
{
|
|
struct memcg_stock_pcp *stock;
|
|
bool ret = true;
|
|
|
|
stock = &get_cpu_var(memcg_stock);
|
|
if (mem == stock->cached && stock->charge)
|
|
stock->charge -= PAGE_SIZE;
|
|
else /* need to call res_counter_charge */
|
|
ret = false;
|
|
put_cpu_var(memcg_stock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Returns stocks cached in percpu to res_counter and reset cached information.
|
|
*/
|
|
static void drain_stock(struct memcg_stock_pcp *stock)
|
|
{
|
|
struct mem_cgroup *old = stock->cached;
|
|
|
|
if (stock->charge) {
|
|
res_counter_uncharge(&old->res, stock->charge);
|
|
if (do_swap_account)
|
|
res_counter_uncharge(&old->memsw, stock->charge);
|
|
}
|
|
stock->cached = NULL;
|
|
stock->charge = 0;
|
|
}
|
|
|
|
/*
|
|
* This must be called under preempt disabled or must be called by
|
|
* a thread which is pinned to local cpu.
|
|
*/
|
|
static void drain_local_stock(struct work_struct *dummy)
|
|
{
|
|
struct memcg_stock_pcp *stock = &__get_cpu_var(memcg_stock);
|
|
drain_stock(stock);
|
|
}
|
|
|
|
/*
|
|
* Cache charges(val) which is from res_counter, to local per_cpu area.
|
|
* This will be consumed by consumt_stock() function, later.
|
|
*/
|
|
static void refill_stock(struct mem_cgroup *mem, int val)
|
|
{
|
|
struct memcg_stock_pcp *stock = &get_cpu_var(memcg_stock);
|
|
|
|
if (stock->cached != mem) { /* reset if necessary */
|
|
drain_stock(stock);
|
|
stock->cached = mem;
|
|
}
|
|
stock->charge += val;
|
|
put_cpu_var(memcg_stock);
|
|
}
|
|
|
|
/*
|
|
* Tries to drain stocked charges in other cpus. This function is asynchronous
|
|
* and just put a work per cpu for draining localy on each cpu. Caller can
|
|
* expects some charges will be back to res_counter later but cannot wait for
|
|
* it.
|
|
*/
|
|
static void drain_all_stock_async(void)
|
|
{
|
|
int cpu;
|
|
/* This function is for scheduling "drain" in asynchronous way.
|
|
* The result of "drain" is not directly handled by callers. Then,
|
|
* if someone is calling drain, we don't have to call drain more.
|
|
* Anyway, WORK_STRUCT_PENDING check in queue_work_on() will catch if
|
|
* there is a race. We just do loose check here.
|
|
*/
|
|
if (atomic_read(&memcg_drain_count))
|
|
return;
|
|
/* Notify other cpus that system-wide "drain" is running */
|
|
atomic_inc(&memcg_drain_count);
|
|
get_online_cpus();
|
|
for_each_online_cpu(cpu) {
|
|
struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu);
|
|
schedule_work_on(cpu, &stock->work);
|
|
}
|
|
put_online_cpus();
|
|
atomic_dec(&memcg_drain_count);
|
|
/* We don't wait for flush_work */
|
|
}
|
|
|
|
/* This is a synchronous drain interface. */
|
|
static void drain_all_stock_sync(void)
|
|
{
|
|
/* called when force_empty is called */
|
|
atomic_inc(&memcg_drain_count);
|
|
schedule_on_each_cpu(drain_local_stock);
|
|
atomic_dec(&memcg_drain_count);
|
|
}
|
|
|
|
static int __cpuinit memcg_stock_cpu_callback(struct notifier_block *nb,
|
|
unsigned long action,
|
|
void *hcpu)
|
|
{
|
|
int cpu = (unsigned long)hcpu;
|
|
struct memcg_stock_pcp *stock;
|
|
|
|
if (action != CPU_DEAD)
|
|
return NOTIFY_OK;
|
|
stock = &per_cpu(memcg_stock, cpu);
|
|
drain_stock(stock);
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
/*
|
|
* Unlike exported interface, "oom" parameter is added. if oom==true,
|
|
* oom-killer can be invoked.
|
|
*/
|
|
static int __mem_cgroup_try_charge(struct mm_struct *mm,
|
|
gfp_t gfp_mask, struct mem_cgroup **memcg, bool oom)
|
|
{
|
|
struct mem_cgroup *mem, *mem_over_limit;
|
|
int nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
|
|
struct res_counter *fail_res;
|
|
int csize = CHARGE_SIZE;
|
|
|
|
/*
|
|
* Unlike gloval-vm's OOM-kill, we're not in memory shortage
|
|
* in system level. So, allow to go ahead dying process in addition to
|
|
* MEMDIE process.
|
|
*/
|
|
if (unlikely(test_thread_flag(TIF_MEMDIE)
|
|
|| fatal_signal_pending(current)))
|
|
goto bypass;
|
|
|
|
/*
|
|
* We always charge the cgroup the mm_struct belongs to.
|
|
* The mm_struct's mem_cgroup changes on task migration if the
|
|
* thread group leader migrates. It's possible that mm is not
|
|
* set, if so charge the init_mm (happens for pagecache usage).
|
|
*/
|
|
mem = *memcg;
|
|
if (likely(!mem)) {
|
|
mem = try_get_mem_cgroup_from_mm(mm);
|
|
*memcg = mem;
|
|
} else {
|
|
css_get(&mem->css);
|
|
}
|
|
if (unlikely(!mem))
|
|
return 0;
|
|
|
|
VM_BUG_ON(css_is_removed(&mem->css));
|
|
if (mem_cgroup_is_root(mem))
|
|
goto done;
|
|
|
|
while (1) {
|
|
int ret = 0;
|
|
unsigned long flags = 0;
|
|
|
|
if (consume_stock(mem))
|
|
goto done;
|
|
|
|
ret = res_counter_charge(&mem->res, csize, &fail_res);
|
|
if (likely(!ret)) {
|
|
if (!do_swap_account)
|
|
break;
|
|
ret = res_counter_charge(&mem->memsw, csize, &fail_res);
|
|
if (likely(!ret))
|
|
break;
|
|
/* mem+swap counter fails */
|
|
res_counter_uncharge(&mem->res, csize);
|
|
flags |= MEM_CGROUP_RECLAIM_NOSWAP;
|
|
mem_over_limit = mem_cgroup_from_res_counter(fail_res,
|
|
memsw);
|
|
} else
|
|
/* mem counter fails */
|
|
mem_over_limit = mem_cgroup_from_res_counter(fail_res,
|
|
res);
|
|
|
|
/* reduce request size and retry */
|
|
if (csize > PAGE_SIZE) {
|
|
csize = PAGE_SIZE;
|
|
continue;
|
|
}
|
|
if (!(gfp_mask & __GFP_WAIT))
|
|
goto nomem;
|
|
|
|
ret = mem_cgroup_hierarchical_reclaim(mem_over_limit, NULL,
|
|
gfp_mask, flags);
|
|
if (ret)
|
|
continue;
|
|
|
|
/*
|
|
* try_to_free_mem_cgroup_pages() might not give us a full
|
|
* picture of reclaim. Some pages are reclaimed and might be
|
|
* moved to swap cache or just unmapped from the cgroup.
|
|
* Check the limit again to see if the reclaim reduced the
|
|
* current usage of the cgroup before giving up
|
|
*
|
|
*/
|
|
if (mem_cgroup_check_under_limit(mem_over_limit))
|
|
continue;
|
|
|
|
/* try to avoid oom while someone is moving charge */
|
|
if (mc.moving_task && current != mc.moving_task) {
|
|
struct mem_cgroup *from, *to;
|
|
bool do_continue = false;
|
|
/*
|
|
* There is a small race that "from" or "to" can be
|
|
* freed by rmdir, so we use css_tryget().
|
|
*/
|
|
rcu_read_lock();
|
|
from = mc.from;
|
|
to = mc.to;
|
|
if (from && css_tryget(&from->css)) {
|
|
if (mem_over_limit->use_hierarchy)
|
|
do_continue = css_is_ancestor(
|
|
&from->css,
|
|
&mem_over_limit->css);
|
|
else
|
|
do_continue = (from == mem_over_limit);
|
|
css_put(&from->css);
|
|
}
|
|
if (!do_continue && to && css_tryget(&to->css)) {
|
|
if (mem_over_limit->use_hierarchy)
|
|
do_continue = css_is_ancestor(
|
|
&to->css,
|
|
&mem_over_limit->css);
|
|
else
|
|
do_continue = (to == mem_over_limit);
|
|
css_put(&to->css);
|
|
}
|
|
rcu_read_unlock();
|
|
if (do_continue) {
|
|
DEFINE_WAIT(wait);
|
|
prepare_to_wait(&mc.waitq, &wait,
|
|
TASK_INTERRUPTIBLE);
|
|
/* moving charge context might have finished. */
|
|
if (mc.moving_task)
|
|
schedule();
|
|
finish_wait(&mc.waitq, &wait);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (!nr_retries--) {
|
|
if (!oom)
|
|
goto nomem;
|
|
if (mem_cgroup_handle_oom(mem_over_limit, gfp_mask)) {
|
|
nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
|
|
continue;
|
|
}
|
|
/* When we reach here, current task is dying .*/
|
|
css_put(&mem->css);
|
|
goto bypass;
|
|
}
|
|
}
|
|
if (csize > PAGE_SIZE)
|
|
refill_stock(mem, csize - PAGE_SIZE);
|
|
done:
|
|
return 0;
|
|
nomem:
|
|
css_put(&mem->css);
|
|
return -ENOMEM;
|
|
bypass:
|
|
*memcg = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Somemtimes we have to undo a charge we got by try_charge().
|
|
* This function is for that and do uncharge, put css's refcnt.
|
|
* gotten by try_charge().
|
|
*/
|
|
static void __mem_cgroup_cancel_charge(struct mem_cgroup *mem,
|
|
unsigned long count)
|
|
{
|
|
if (!mem_cgroup_is_root(mem)) {
|
|
res_counter_uncharge(&mem->res, PAGE_SIZE * count);
|
|
if (do_swap_account)
|
|
res_counter_uncharge(&mem->memsw, PAGE_SIZE * count);
|
|
VM_BUG_ON(test_bit(CSS_ROOT, &mem->css.flags));
|
|
WARN_ON_ONCE(count > INT_MAX);
|
|
__css_put(&mem->css, (int)count);
|
|
}
|
|
/* we don't need css_put for root */
|
|
}
|
|
|
|
static void mem_cgroup_cancel_charge(struct mem_cgroup *mem)
|
|
{
|
|
__mem_cgroup_cancel_charge(mem, 1);
|
|
}
|
|
|
|
/*
|
|
* A helper function to get mem_cgroup from ID. must be called under
|
|
* rcu_read_lock(). The caller must check css_is_removed() or some if
|
|
* it's concern. (dropping refcnt from swap can be called against removed
|
|
* memcg.)
|
|
*/
|
|
static struct mem_cgroup *mem_cgroup_lookup(unsigned short id)
|
|
{
|
|
struct cgroup_subsys_state *css;
|
|
|
|
/* ID 0 is unused ID */
|
|
if (!id)
|
|
return NULL;
|
|
css = css_lookup(&mem_cgroup_subsys, id);
|
|
if (!css)
|
|
return NULL;
|
|
return container_of(css, struct mem_cgroup, css);
|
|
}
|
|
|
|
struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
|
|
{
|
|
struct mem_cgroup *mem = NULL;
|
|
struct page_cgroup *pc;
|
|
unsigned short id;
|
|
swp_entry_t ent;
|
|
|
|
VM_BUG_ON(!PageLocked(page));
|
|
|
|
pc = lookup_page_cgroup(page);
|
|
lock_page_cgroup(pc);
|
|
if (PageCgroupUsed(pc)) {
|
|
mem = pc->mem_cgroup;
|
|
if (mem && !css_tryget(&mem->css))
|
|
mem = NULL;
|
|
} else if (PageSwapCache(page)) {
|
|
ent.val = page_private(page);
|
|
id = lookup_swap_cgroup(ent);
|
|
rcu_read_lock();
|
|
mem = mem_cgroup_lookup(id);
|
|
if (mem && !css_tryget(&mem->css))
|
|
mem = NULL;
|
|
rcu_read_unlock();
|
|
}
|
|
unlock_page_cgroup(pc);
|
|
return mem;
|
|
}
|
|
|
|
/*
|
|
* commit a charge got by __mem_cgroup_try_charge() and makes page_cgroup to be
|
|
* USED state. If already USED, uncharge and return.
|
|
*/
|
|
|
|
static void __mem_cgroup_commit_charge(struct mem_cgroup *mem,
|
|
struct page_cgroup *pc,
|
|
enum charge_type ctype)
|
|
{
|
|
/* try_charge() can return NULL to *memcg, taking care of it. */
|
|
if (!mem)
|
|
return;
|
|
|
|
lock_page_cgroup(pc);
|
|
if (unlikely(PageCgroupUsed(pc))) {
|
|
unlock_page_cgroup(pc);
|
|
mem_cgroup_cancel_charge(mem);
|
|
return;
|
|
}
|
|
|
|
pc->mem_cgroup = mem;
|
|
/*
|
|
* We access a page_cgroup asynchronously without lock_page_cgroup().
|
|
* Especially when a page_cgroup is taken from a page, pc->mem_cgroup
|
|
* is accessed after testing USED bit. To make pc->mem_cgroup visible
|
|
* before USED bit, we need memory barrier here.
|
|
* See mem_cgroup_add_lru_list(), etc.
|
|
*/
|
|
smp_wmb();
|
|
switch (ctype) {
|
|
case MEM_CGROUP_CHARGE_TYPE_CACHE:
|
|
case MEM_CGROUP_CHARGE_TYPE_SHMEM:
|
|
SetPageCgroupCache(pc);
|
|
SetPageCgroupUsed(pc);
|
|
break;
|
|
case MEM_CGROUP_CHARGE_TYPE_MAPPED:
|
|
ClearPageCgroupCache(pc);
|
|
SetPageCgroupUsed(pc);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
mem_cgroup_charge_statistics(mem, pc, true);
|
|
|
|
unlock_page_cgroup(pc);
|
|
/*
|
|
* "charge_statistics" updated event counter. Then, check it.
|
|
* Insert ancestor (and ancestor's ancestors), to softlimit RB-tree.
|
|
* if they exceeds softlimit.
|
|
*/
|
|
memcg_check_events(mem, pc->page);
|
|
}
|
|
|
|
/**
|
|
* __mem_cgroup_move_account - move account of the page
|
|
* @pc: page_cgroup of the page.
|
|
* @from: mem_cgroup which the page is moved from.
|
|
* @to: mem_cgroup which the page is moved to. @from != @to.
|
|
* @uncharge: whether we should call uncharge and css_put against @from.
|
|
*
|
|
* The caller must confirm following.
|
|
* - page is not on LRU (isolate_page() is useful.)
|
|
* - the pc is locked, used, and ->mem_cgroup points to @from.
|
|
*
|
|
* This function doesn't do "charge" nor css_get to new cgroup. It should be
|
|
* done by a caller(__mem_cgroup_try_charge would be usefull). If @uncharge is
|
|
* true, this function does "uncharge" from old cgroup, but it doesn't if
|
|
* @uncharge is false, so a caller should do "uncharge".
|
|
*/
|
|
|
|
static void __mem_cgroup_move_account(struct page_cgroup *pc,
|
|
struct mem_cgroup *from, struct mem_cgroup *to, bool uncharge)
|
|
{
|
|
struct page *page;
|
|
|
|
VM_BUG_ON(from == to);
|
|
VM_BUG_ON(PageLRU(pc->page));
|
|
VM_BUG_ON(!PageCgroupLocked(pc));
|
|
VM_BUG_ON(!PageCgroupUsed(pc));
|
|
VM_BUG_ON(pc->mem_cgroup != from);
|
|
|
|
page = pc->page;
|
|
if (page_mapped(page) && !PageAnon(page)) {
|
|
/* Update mapped_file data for mem_cgroup */
|
|
preempt_disable();
|
|
__this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
|
|
__this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
|
|
preempt_enable();
|
|
}
|
|
mem_cgroup_charge_statistics(from, pc, false);
|
|
if (uncharge)
|
|
/* This is not "cancel", but cancel_charge does all we need. */
|
|
mem_cgroup_cancel_charge(from);
|
|
|
|
/* caller should have done css_get */
|
|
pc->mem_cgroup = to;
|
|
mem_cgroup_charge_statistics(to, pc, true);
|
|
/*
|
|
* We charges against "to" which may not have any tasks. Then, "to"
|
|
* can be under rmdir(). But in current implementation, caller of
|
|
* this function is just force_empty() and move charge, so it's
|
|
* garanteed that "to" is never removed. So, we don't check rmdir
|
|
* status here.
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* check whether the @pc is valid for moving account and call
|
|
* __mem_cgroup_move_account()
|
|
*/
|
|
static int mem_cgroup_move_account(struct page_cgroup *pc,
|
|
struct mem_cgroup *from, struct mem_cgroup *to, bool uncharge)
|
|
{
|
|
int ret = -EINVAL;
|
|
lock_page_cgroup(pc);
|
|
if (PageCgroupUsed(pc) && pc->mem_cgroup == from) {
|
|
__mem_cgroup_move_account(pc, from, to, uncharge);
|
|
ret = 0;
|
|
}
|
|
unlock_page_cgroup(pc);
|
|
/*
|
|
* check events
|
|
*/
|
|
memcg_check_events(to, pc->page);
|
|
memcg_check_events(from, pc->page);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* move charges to its parent.
|
|
*/
|
|
|
|
static int mem_cgroup_move_parent(struct page_cgroup *pc,
|
|
struct mem_cgroup *child,
|
|
gfp_t gfp_mask)
|
|
{
|
|
struct page *page = pc->page;
|
|
struct cgroup *cg = child->css.cgroup;
|
|
struct cgroup *pcg = cg->parent;
|
|
struct mem_cgroup *parent;
|
|
int ret;
|
|
|
|
/* Is ROOT ? */
|
|
if (!pcg)
|
|
return -EINVAL;
|
|
|
|
ret = -EBUSY;
|
|
if (!get_page_unless_zero(page))
|
|
goto out;
|
|
if (isolate_lru_page(page))
|
|
goto put;
|
|
|
|
parent = mem_cgroup_from_cont(pcg);
|
|
ret = __mem_cgroup_try_charge(NULL, gfp_mask, &parent, false);
|
|
if (ret || !parent)
|
|
goto put_back;
|
|
|
|
ret = mem_cgroup_move_account(pc, child, parent, true);
|
|
if (ret)
|
|
mem_cgroup_cancel_charge(parent);
|
|
put_back:
|
|
putback_lru_page(page);
|
|
put:
|
|
put_page(page);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Charge the memory controller for page usage.
|
|
* Return
|
|
* 0 if the charge was successful
|
|
* < 0 if the cgroup is over its limit
|
|
*/
|
|
static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
|
|
gfp_t gfp_mask, enum charge_type ctype,
|
|
struct mem_cgroup *memcg)
|
|
{
|
|
struct mem_cgroup *mem;
|
|
struct page_cgroup *pc;
|
|
int ret;
|
|
|
|
pc = lookup_page_cgroup(page);
|
|
/* can happen at boot */
|
|
if (unlikely(!pc))
|
|
return 0;
|
|
prefetchw(pc);
|
|
|
|
mem = memcg;
|
|
ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, true);
|
|
if (ret || !mem)
|
|
return ret;
|
|
|
|
__mem_cgroup_commit_charge(mem, pc, ctype);
|
|
return 0;
|
|
}
|
|
|
|
int mem_cgroup_newpage_charge(struct page *page,
|
|
struct mm_struct *mm, gfp_t gfp_mask)
|
|
{
|
|
if (mem_cgroup_disabled())
|
|
return 0;
|
|
if (PageCompound(page))
|
|
return 0;
|
|
/*
|
|
* If already mapped, we don't have to account.
|
|
* If page cache, page->mapping has address_space.
|
|
* But page->mapping may have out-of-use anon_vma pointer,
|
|
* detecit it by PageAnon() check. newly-mapped-anon's page->mapping
|
|
* is NULL.
|
|
*/
|
|
if (page_mapped(page) || (page->mapping && !PageAnon(page)))
|
|
return 0;
|
|
if (unlikely(!mm))
|
|
mm = &init_mm;
|
|
return mem_cgroup_charge_common(page, mm, gfp_mask,
|
|
MEM_CGROUP_CHARGE_TYPE_MAPPED, NULL);
|
|
}
|
|
|
|
static void
|
|
__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
|
|
enum charge_type ctype);
|
|
|
|
int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
|
|
gfp_t gfp_mask)
|
|
{
|
|
struct mem_cgroup *mem = NULL;
|
|
int ret;
|
|
|
|
if (mem_cgroup_disabled())
|
|
return 0;
|
|
if (PageCompound(page))
|
|
return 0;
|
|
/*
|
|
* Corner case handling. This is called from add_to_page_cache()
|
|
* in usual. But some FS (shmem) precharges this page before calling it
|
|
* and call add_to_page_cache() with GFP_NOWAIT.
|
|
*
|
|
* For GFP_NOWAIT case, the page may be pre-charged before calling
|
|
* add_to_page_cache(). (See shmem.c) check it here and avoid to call
|
|
* charge twice. (It works but has to pay a bit larger cost.)
|
|
* And when the page is SwapCache, it should take swap information
|
|
* into account. This is under lock_page() now.
|
|
*/
|
|
if (!(gfp_mask & __GFP_WAIT)) {
|
|
struct page_cgroup *pc;
|
|
|
|
|
|
pc = lookup_page_cgroup(page);
|
|
if (!pc)
|
|
return 0;
|
|
lock_page_cgroup(pc);
|
|
if (PageCgroupUsed(pc)) {
|
|
unlock_page_cgroup(pc);
|
|
return 0;
|
|
}
|
|
unlock_page_cgroup(pc);
|
|
}
|
|
|
|
if (unlikely(!mm && !mem))
|
|
mm = &init_mm;
|
|
|
|
if (page_is_file_cache(page))
|
|
return mem_cgroup_charge_common(page, mm, gfp_mask,
|
|
MEM_CGROUP_CHARGE_TYPE_CACHE, NULL);
|
|
|
|
/* shmem */
|
|
if (PageSwapCache(page)) {
|
|
ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &mem);
|
|
if (!ret)
|
|
__mem_cgroup_commit_charge_swapin(page, mem,
|
|
MEM_CGROUP_CHARGE_TYPE_SHMEM);
|
|
} else
|
|
ret = mem_cgroup_charge_common(page, mm, gfp_mask,
|
|
MEM_CGROUP_CHARGE_TYPE_SHMEM, mem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* While swap-in, try_charge -> commit or cancel, the page is locked.
|
|
* And when try_charge() successfully returns, one refcnt to memcg without
|
|
* struct page_cgroup is acquired. This refcnt will be consumed by
|
|
* "commit()" or removed by "cancel()"
|
|
*/
|
|
int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
|
|
struct page *page,
|
|
gfp_t mask, struct mem_cgroup **ptr)
|
|
{
|
|
struct mem_cgroup *mem;
|
|
int ret;
|
|
|
|
if (mem_cgroup_disabled())
|
|
return 0;
|
|
|
|
if (!do_swap_account)
|
|
goto charge_cur_mm;
|
|
/*
|
|
* A racing thread's fault, or swapoff, may have already updated
|
|
* the pte, and even removed page from swap cache: in those cases
|
|
* do_swap_page()'s pte_same() test will fail; but there's also a
|
|
* KSM case which does need to charge the page.
|
|
*/
|
|
if (!PageSwapCache(page))
|
|
goto charge_cur_mm;
|
|
mem = try_get_mem_cgroup_from_page(page);
|
|
if (!mem)
|
|
goto charge_cur_mm;
|
|
*ptr = mem;
|
|
ret = __mem_cgroup_try_charge(NULL, mask, ptr, true);
|
|
/* drop extra refcnt from tryget */
|
|
css_put(&mem->css);
|
|
return ret;
|
|
charge_cur_mm:
|
|
if (unlikely(!mm))
|
|
mm = &init_mm;
|
|
return __mem_cgroup_try_charge(mm, mask, ptr, true);
|
|
}
|
|
|
|
static void
|
|
__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
|
|
enum charge_type ctype)
|
|
{
|
|
struct page_cgroup *pc;
|
|
|
|
if (mem_cgroup_disabled())
|
|
return;
|
|
if (!ptr)
|
|
return;
|
|
cgroup_exclude_rmdir(&ptr->css);
|
|
pc = lookup_page_cgroup(page);
|
|
mem_cgroup_lru_del_before_commit_swapcache(page);
|
|
__mem_cgroup_commit_charge(ptr, pc, ctype);
|
|
mem_cgroup_lru_add_after_commit_swapcache(page);
|
|
/*
|
|
* Now swap is on-memory. This means this page may be
|
|
* counted both as mem and swap....double count.
|
|
* Fix it by uncharging from memsw. Basically, this SwapCache is stable
|
|
* under lock_page(). But in do_swap_page()::memory.c, reuse_swap_page()
|
|
* may call delete_from_swap_cache() before reach here.
|
|
*/
|
|
if (do_swap_account && PageSwapCache(page)) {
|
|
swp_entry_t ent = {.val = page_private(page)};
|
|
unsigned short id;
|
|
struct mem_cgroup *memcg;
|
|
|
|
id = swap_cgroup_record(ent, 0);
|
|
rcu_read_lock();
|
|
memcg = mem_cgroup_lookup(id);
|
|
if (memcg) {
|
|
/*
|
|
* This recorded memcg can be obsolete one. So, avoid
|
|
* calling css_tryget
|
|
*/
|
|
if (!mem_cgroup_is_root(memcg))
|
|
res_counter_uncharge(&memcg->memsw, PAGE_SIZE);
|
|
mem_cgroup_swap_statistics(memcg, false);
|
|
mem_cgroup_put(memcg);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
/*
|
|
* At swapin, we may charge account against cgroup which has no tasks.
|
|
* So, rmdir()->pre_destroy() can be called while we do this charge.
|
|
* In that case, we need to call pre_destroy() again. check it here.
|
|
*/
|
|
cgroup_release_and_wakeup_rmdir(&ptr->css);
|
|
}
|
|
|
|
void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr)
|
|
{
|
|
__mem_cgroup_commit_charge_swapin(page, ptr,
|
|
MEM_CGROUP_CHARGE_TYPE_MAPPED);
|
|
}
|
|
|
|
void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *mem)
|
|
{
|
|
if (mem_cgroup_disabled())
|
|
return;
|
|
if (!mem)
|
|
return;
|
|
mem_cgroup_cancel_charge(mem);
|
|
}
|
|
|
|
static void
|
|
__do_uncharge(struct mem_cgroup *mem, const enum charge_type ctype)
|
|
{
|
|
struct memcg_batch_info *batch = NULL;
|
|
bool uncharge_memsw = true;
|
|
/* If swapout, usage of swap doesn't decrease */
|
|
if (!do_swap_account || ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT)
|
|
uncharge_memsw = false;
|
|
/*
|
|
* do_batch > 0 when unmapping pages or inode invalidate/truncate.
|
|
* In those cases, all pages freed continously can be expected to be in
|
|
* the same cgroup and we have chance to coalesce uncharges.
|
|
* But we do uncharge one by one if this is killed by OOM(TIF_MEMDIE)
|
|
* because we want to do uncharge as soon as possible.
|
|
*/
|
|
if (!current->memcg_batch.do_batch || test_thread_flag(TIF_MEMDIE))
|
|
goto direct_uncharge;
|
|
|
|
batch = ¤t->memcg_batch;
|
|
/*
|
|
* In usual, we do css_get() when we remember memcg pointer.
|
|
* But in this case, we keep res->usage until end of a series of
|
|
* uncharges. Then, it's ok to ignore memcg's refcnt.
|
|
*/
|
|
if (!batch->memcg)
|
|
batch->memcg = mem;
|
|
/*
|
|
* In typical case, batch->memcg == mem. This means we can
|
|
* merge a series of uncharges to an uncharge of res_counter.
|
|
* If not, we uncharge res_counter ony by one.
|
|
*/
|
|
if (batch->memcg != mem)
|
|
goto direct_uncharge;
|
|
/* remember freed charge and uncharge it later */
|
|
batch->bytes += PAGE_SIZE;
|
|
if (uncharge_memsw)
|
|
batch->memsw_bytes += PAGE_SIZE;
|
|
return;
|
|
direct_uncharge:
|
|
res_counter_uncharge(&mem->res, PAGE_SIZE);
|
|
if (uncharge_memsw)
|
|
res_counter_uncharge(&mem->memsw, PAGE_SIZE);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* uncharge if !page_mapped(page)
|
|
*/
|
|
static struct mem_cgroup *
|
|
__mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
|
|
{
|
|
struct page_cgroup *pc;
|
|
struct mem_cgroup *mem = NULL;
|
|
struct mem_cgroup_per_zone *mz;
|
|
|
|
if (mem_cgroup_disabled())
|
|
return NULL;
|
|
|
|
if (PageSwapCache(page))
|
|
return NULL;
|
|
|
|
/*
|
|
* Check if our page_cgroup is valid
|
|
*/
|
|
pc = lookup_page_cgroup(page);
|
|
if (unlikely(!pc || !PageCgroupUsed(pc)))
|
|
return NULL;
|
|
|
|
lock_page_cgroup(pc);
|
|
|
|
mem = pc->mem_cgroup;
|
|
|
|
if (!PageCgroupUsed(pc))
|
|
goto unlock_out;
|
|
|
|
switch (ctype) {
|
|
case MEM_CGROUP_CHARGE_TYPE_MAPPED:
|
|
case MEM_CGROUP_CHARGE_TYPE_DROP:
|
|
if (page_mapped(page))
|
|
goto unlock_out;
|
|
break;
|
|
case MEM_CGROUP_CHARGE_TYPE_SWAPOUT:
|
|
if (!PageAnon(page)) { /* Shared memory */
|
|
if (page->mapping && !page_is_file_cache(page))
|
|
goto unlock_out;
|
|
} else if (page_mapped(page)) /* Anon */
|
|
goto unlock_out;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (!mem_cgroup_is_root(mem))
|
|
__do_uncharge(mem, ctype);
|
|
if (ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT)
|
|
mem_cgroup_swap_statistics(mem, true);
|
|
mem_cgroup_charge_statistics(mem, pc, false);
|
|
|
|
ClearPageCgroupUsed(pc);
|
|
/*
|
|
* pc->mem_cgroup is not cleared here. It will be accessed when it's
|
|
* freed from LRU. This is safe because uncharged page is expected not
|
|
* to be reused (freed soon). Exception is SwapCache, it's handled by
|
|
* special functions.
|
|
*/
|
|
|
|
mz = page_cgroup_zoneinfo(pc);
|
|
unlock_page_cgroup(pc);
|
|
|
|
memcg_check_events(mem, page);
|
|
/* at swapout, this memcg will be accessed to record to swap */
|
|
if (ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT)
|
|
css_put(&mem->css);
|
|
|
|
return mem;
|
|
|
|
unlock_out:
|
|
unlock_page_cgroup(pc);
|
|
return NULL;
|
|
}
|
|
|
|
void mem_cgroup_uncharge_page(struct page *page)
|
|
{
|
|
/* early check. */
|
|
if (page_mapped(page))
|
|
return;
|
|
if (page->mapping && !PageAnon(page))
|
|
return;
|
|
__mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_MAPPED);
|
|
}
|
|
|
|
void mem_cgroup_uncharge_cache_page(struct page *page)
|
|
{
|
|
VM_BUG_ON(page_mapped(page));
|
|
VM_BUG_ON(page->mapping);
|
|
__mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_CACHE);
|
|
}
|
|
|
|
/*
|
|
* Batch_start/batch_end is called in unmap_page_range/invlidate/trucate.
|
|
* In that cases, pages are freed continuously and we can expect pages
|
|
* are in the same memcg. All these calls itself limits the number of
|
|
* pages freed at once, then uncharge_start/end() is called properly.
|
|
* This may be called prural(2) times in a context,
|
|
*/
|
|
|
|
void mem_cgroup_uncharge_start(void)
|
|
{
|
|
current->memcg_batch.do_batch++;
|
|
/* We can do nest. */
|
|
if (current->memcg_batch.do_batch == 1) {
|
|
current->memcg_batch.memcg = NULL;
|
|
current->memcg_batch.bytes = 0;
|
|
current->memcg_batch.memsw_bytes = 0;
|
|
}
|
|
}
|
|
|
|
void mem_cgroup_uncharge_end(void)
|
|
{
|
|
struct memcg_batch_info *batch = ¤t->memcg_batch;
|
|
|
|
if (!batch->do_batch)
|
|
return;
|
|
|
|
batch->do_batch--;
|
|
if (batch->do_batch) /* If stacked, do nothing. */
|
|
return;
|
|
|
|
if (!batch->memcg)
|
|
return;
|
|
/*
|
|
* This "batch->memcg" is valid without any css_get/put etc...
|
|
* bacause we hide charges behind us.
|
|
*/
|
|
if (batch->bytes)
|
|
res_counter_uncharge(&batch->memcg->res, batch->bytes);
|
|
if (batch->memsw_bytes)
|
|
res_counter_uncharge(&batch->memcg->memsw, batch->memsw_bytes);
|
|
/* forget this pointer (for sanity check) */
|
|
batch->memcg = NULL;
|
|
}
|
|
|
|
#ifdef CONFIG_SWAP
|
|
/*
|
|
* called after __delete_from_swap_cache() and drop "page" account.
|
|
* memcg information is recorded to swap_cgroup of "ent"
|
|
*/
|
|
void
|
|
mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout)
|
|
{
|
|
struct mem_cgroup *memcg;
|
|
int ctype = MEM_CGROUP_CHARGE_TYPE_SWAPOUT;
|
|
|
|
if (!swapout) /* this was a swap cache but the swap is unused ! */
|
|
ctype = MEM_CGROUP_CHARGE_TYPE_DROP;
|
|
|
|
memcg = __mem_cgroup_uncharge_common(page, ctype);
|
|
|
|
/* record memcg information */
|
|
if (do_swap_account && swapout && memcg) {
|
|
swap_cgroup_record(ent, css_id(&memcg->css));
|
|
mem_cgroup_get(memcg);
|
|
}
|
|
if (swapout && memcg)
|
|
css_put(&memcg->css);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
|
|
/*
|
|
* called from swap_entry_free(). remove record in swap_cgroup and
|
|
* uncharge "memsw" account.
|
|
*/
|
|
void mem_cgroup_uncharge_swap(swp_entry_t ent)
|
|
{
|
|
struct mem_cgroup *memcg;
|
|
unsigned short id;
|
|
|
|
if (!do_swap_account)
|
|
return;
|
|
|
|
id = swap_cgroup_record(ent, 0);
|
|
rcu_read_lock();
|
|
memcg = mem_cgroup_lookup(id);
|
|
if (memcg) {
|
|
/*
|
|
* We uncharge this because swap is freed.
|
|
* This memcg can be obsolete one. We avoid calling css_tryget
|
|
*/
|
|
if (!mem_cgroup_is_root(memcg))
|
|
res_counter_uncharge(&memcg->memsw, PAGE_SIZE);
|
|
mem_cgroup_swap_statistics(memcg, false);
|
|
mem_cgroup_put(memcg);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/**
|
|
* mem_cgroup_move_swap_account - move swap charge and swap_cgroup's record.
|
|
* @entry: swap entry to be moved
|
|
* @from: mem_cgroup which the entry is moved from
|
|
* @to: mem_cgroup which the entry is moved to
|
|
* @need_fixup: whether we should fixup res_counters and refcounts.
|
|
*
|
|
* It succeeds only when the swap_cgroup's record for this entry is the same
|
|
* as the mem_cgroup's id of @from.
|
|
*
|
|
* Returns 0 on success, -EINVAL on failure.
|
|
*
|
|
* The caller must have charged to @to, IOW, called res_counter_charge() about
|
|
* both res and memsw, and called css_get().
|
|
*/
|
|
static int mem_cgroup_move_swap_account(swp_entry_t entry,
|
|
struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup)
|
|
{
|
|
unsigned short old_id, new_id;
|
|
|
|
old_id = css_id(&from->css);
|
|
new_id = css_id(&to->css);
|
|
|
|
if (swap_cgroup_cmpxchg(entry, old_id, new_id) == old_id) {
|
|
mem_cgroup_swap_statistics(from, false);
|
|
mem_cgroup_swap_statistics(to, true);
|
|
/*
|
|
* This function is only called from task migration context now.
|
|
* It postpones res_counter and refcount handling till the end
|
|
* of task migration(mem_cgroup_clear_mc()) for performance
|
|
* improvement. But we cannot postpone mem_cgroup_get(to)
|
|
* because if the process that has been moved to @to does
|
|
* swap-in, the refcount of @to might be decreased to 0.
|
|
*/
|
|
mem_cgroup_get(to);
|
|
if (need_fixup) {
|
|
if (!mem_cgroup_is_root(from))
|
|
res_counter_uncharge(&from->memsw, PAGE_SIZE);
|
|
mem_cgroup_put(from);
|
|
/*
|
|
* we charged both to->res and to->memsw, so we should
|
|
* uncharge to->res.
|
|
*/
|
|
if (!mem_cgroup_is_root(to))
|
|
res_counter_uncharge(&to->res, PAGE_SIZE);
|
|
css_put(&to->css);
|
|
}
|
|
return 0;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
#else
|
|
static inline int mem_cgroup_move_swap_account(swp_entry_t entry,
|
|
struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Before starting migration, account PAGE_SIZE to mem_cgroup that the old
|
|
* page belongs to.
|
|
*/
|
|
int mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
|
|
{
|
|
struct page_cgroup *pc;
|
|
struct mem_cgroup *mem = NULL;
|
|
int ret = 0;
|
|
|
|
if (mem_cgroup_disabled())
|
|
return 0;
|
|
|
|
pc = lookup_page_cgroup(page);
|
|
lock_page_cgroup(pc);
|
|
if (PageCgroupUsed(pc)) {
|
|
mem = pc->mem_cgroup;
|
|
css_get(&mem->css);
|
|
}
|
|
unlock_page_cgroup(pc);
|
|
|
|
if (mem) {
|
|
ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem, false);
|
|
css_put(&mem->css);
|
|
}
|
|
*ptr = mem;
|
|
return ret;
|
|
}
|
|
|
|
/* remove redundant charge if migration failed*/
|
|
void mem_cgroup_end_migration(struct mem_cgroup *mem,
|
|
struct page *oldpage, struct page *newpage)
|
|
{
|
|
struct page *target, *unused;
|
|
struct page_cgroup *pc;
|
|
enum charge_type ctype;
|
|
|
|
if (!mem)
|
|
return;
|
|
cgroup_exclude_rmdir(&mem->css);
|
|
/* at migration success, oldpage->mapping is NULL. */
|
|
if (oldpage->mapping) {
|
|
target = oldpage;
|
|
unused = NULL;
|
|
} else {
|
|
target = newpage;
|
|
unused = oldpage;
|
|
}
|
|
|
|
if (PageAnon(target))
|
|
ctype = MEM_CGROUP_CHARGE_TYPE_MAPPED;
|
|
else if (page_is_file_cache(target))
|
|
ctype = MEM_CGROUP_CHARGE_TYPE_CACHE;
|
|
else
|
|
ctype = MEM_CGROUP_CHARGE_TYPE_SHMEM;
|
|
|
|
/* unused page is not on radix-tree now. */
|
|
if (unused)
|
|
__mem_cgroup_uncharge_common(unused, ctype);
|
|
|
|
pc = lookup_page_cgroup(target);
|
|
/*
|
|
* __mem_cgroup_commit_charge() check PCG_USED bit of page_cgroup.
|
|
* So, double-counting is effectively avoided.
|
|
*/
|
|
__mem_cgroup_commit_charge(mem, pc, ctype);
|
|
|
|
/*
|
|
* Both of oldpage and newpage are still under lock_page().
|
|
* Then, we don't have to care about race in radix-tree.
|
|
* But we have to be careful that this page is unmapped or not.
|
|
*
|
|
* There is a case for !page_mapped(). At the start of
|
|
* migration, oldpage was mapped. But now, it's zapped.
|
|
* But we know *target* page is not freed/reused under us.
|
|
* mem_cgroup_uncharge_page() does all necessary checks.
|
|
*/
|
|
if (ctype == MEM_CGROUP_CHARGE_TYPE_MAPPED)
|
|
mem_cgroup_uncharge_page(target);
|
|
/*
|
|
* At migration, we may charge account against cgroup which has no tasks
|
|
* So, rmdir()->pre_destroy() can be called while we do this charge.
|
|
* In that case, we need to call pre_destroy() again. check it here.
|
|
*/
|
|
cgroup_release_and_wakeup_rmdir(&mem->css);
|
|
}
|
|
|
|
/*
|
|
* A call to try to shrink memory usage on charge failure at shmem's swapin.
|
|
* Calling hierarchical_reclaim is not enough because we should update
|
|
* last_oom_jiffies to prevent pagefault_out_of_memory from invoking global OOM.
|
|
* Moreover considering hierarchy, we should reclaim from the mem_over_limit,
|
|
* not from the memcg which this page would be charged to.
|
|
* try_charge_swapin does all of these works properly.
|
|
*/
|
|
int mem_cgroup_shmem_charge_fallback(struct page *page,
|
|
struct mm_struct *mm,
|
|
gfp_t gfp_mask)
|
|
{
|
|
struct mem_cgroup *mem = NULL;
|
|
int ret;
|
|
|
|
if (mem_cgroup_disabled())
|
|
return 0;
|
|
|
|
ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &mem);
|
|
if (!ret)
|
|
mem_cgroup_cancel_charge_swapin(mem); /* it does !mem check */
|
|
|
|
return ret;
|
|
}
|
|
|
|
static DEFINE_MUTEX(set_limit_mutex);
|
|
|
|
static int mem_cgroup_resize_limit(struct mem_cgroup *memcg,
|
|
unsigned long long val)
|
|
{
|
|
int retry_count;
|
|
u64 memswlimit;
|
|
int ret = 0;
|
|
int children = mem_cgroup_count_children(memcg);
|
|
u64 curusage, oldusage;
|
|
|
|
/*
|
|
* For keeping hierarchical_reclaim simple, how long we should retry
|
|
* is depends on callers. We set our retry-count to be function
|
|
* of # of children which we should visit in this loop.
|
|
*/
|
|
retry_count = MEM_CGROUP_RECLAIM_RETRIES * children;
|
|
|
|
oldusage = res_counter_read_u64(&memcg->res, RES_USAGE);
|
|
|
|
while (retry_count) {
|
|
if (signal_pending(current)) {
|
|
ret = -EINTR;
|
|
break;
|
|
}
|
|
/*
|
|
* Rather than hide all in some function, I do this in
|
|
* open coded manner. You see what this really does.
|
|
* We have to guarantee mem->res.limit < mem->memsw.limit.
|
|
*/
|
|
mutex_lock(&set_limit_mutex);
|
|
memswlimit = res_counter_read_u64(&memcg->memsw, RES_LIMIT);
|
|
if (memswlimit < val) {
|
|
ret = -EINVAL;
|
|
mutex_unlock(&set_limit_mutex);
|
|
break;
|
|
}
|
|
ret = res_counter_set_limit(&memcg->res, val);
|
|
if (!ret) {
|
|
if (memswlimit == val)
|
|
memcg->memsw_is_minimum = true;
|
|
else
|
|
memcg->memsw_is_minimum = false;
|
|
}
|
|
mutex_unlock(&set_limit_mutex);
|
|
|
|
if (!ret)
|
|
break;
|
|
|
|
mem_cgroup_hierarchical_reclaim(memcg, NULL, GFP_KERNEL,
|
|
MEM_CGROUP_RECLAIM_SHRINK);
|
|
curusage = res_counter_read_u64(&memcg->res, RES_USAGE);
|
|
/* Usage is reduced ? */
|
|
if (curusage >= oldusage)
|
|
retry_count--;
|
|
else
|
|
oldusage = curusage;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg,
|
|
unsigned long long val)
|
|
{
|
|
int retry_count;
|
|
u64 memlimit, oldusage, curusage;
|
|
int children = mem_cgroup_count_children(memcg);
|
|
int ret = -EBUSY;
|
|
|
|
/* see mem_cgroup_resize_res_limit */
|
|
retry_count = children * MEM_CGROUP_RECLAIM_RETRIES;
|
|
oldusage = res_counter_read_u64(&memcg->memsw, RES_USAGE);
|
|
while (retry_count) {
|
|
if (signal_pending(current)) {
|
|
ret = -EINTR;
|
|
break;
|
|
}
|
|
/*
|
|
* Rather than hide all in some function, I do this in
|
|
* open coded manner. You see what this really does.
|
|
* We have to guarantee mem->res.limit < mem->memsw.limit.
|
|
*/
|
|
mutex_lock(&set_limit_mutex);
|
|
memlimit = res_counter_read_u64(&memcg->res, RES_LIMIT);
|
|
if (memlimit > val) {
|
|
ret = -EINVAL;
|
|
mutex_unlock(&set_limit_mutex);
|
|
break;
|
|
}
|
|
ret = res_counter_set_limit(&memcg->memsw, val);
|
|
if (!ret) {
|
|
if (memlimit == val)
|
|
memcg->memsw_is_minimum = true;
|
|
else
|
|
memcg->memsw_is_minimum = false;
|
|
}
|
|
mutex_unlock(&set_limit_mutex);
|
|
|
|
if (!ret)
|
|
break;
|
|
|
|
mem_cgroup_hierarchical_reclaim(memcg, NULL, GFP_KERNEL,
|
|
MEM_CGROUP_RECLAIM_NOSWAP |
|
|
MEM_CGROUP_RECLAIM_SHRINK);
|
|
curusage = res_counter_read_u64(&memcg->memsw, RES_USAGE);
|
|
/* Usage is reduced ? */
|
|
if (curusage >= oldusage)
|
|
retry_count--;
|
|
else
|
|
oldusage = curusage;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
|
|
gfp_t gfp_mask, int nid,
|
|
int zid)
|
|
{
|
|
unsigned long nr_reclaimed = 0;
|
|
struct mem_cgroup_per_zone *mz, *next_mz = NULL;
|
|
unsigned long reclaimed;
|
|
int loop = 0;
|
|
struct mem_cgroup_tree_per_zone *mctz;
|
|
unsigned long long excess;
|
|
|
|
if (order > 0)
|
|
return 0;
|
|
|
|
mctz = soft_limit_tree_node_zone(nid, zid);
|
|
/*
|
|
* This loop can run a while, specially if mem_cgroup's continuously
|
|
* keep exceeding their soft limit and putting the system under
|
|
* pressure
|
|
*/
|
|
do {
|
|
if (next_mz)
|
|
mz = next_mz;
|
|
else
|
|
mz = mem_cgroup_largest_soft_limit_node(mctz);
|
|
if (!mz)
|
|
break;
|
|
|
|
reclaimed = mem_cgroup_hierarchical_reclaim(mz->mem, zone,
|
|
gfp_mask,
|
|
MEM_CGROUP_RECLAIM_SOFT);
|
|
nr_reclaimed += reclaimed;
|
|
spin_lock(&mctz->lock);
|
|
|
|
/*
|
|
* If we failed to reclaim anything from this memory cgroup
|
|
* it is time to move on to the next cgroup
|
|
*/
|
|
next_mz = NULL;
|
|
if (!reclaimed) {
|
|
do {
|
|
/*
|
|
* Loop until we find yet another one.
|
|
*
|
|
* By the time we get the soft_limit lock
|
|
* again, someone might have aded the
|
|
* group back on the RB tree. Iterate to
|
|
* make sure we get a different mem.
|
|
* mem_cgroup_largest_soft_limit_node returns
|
|
* NULL if no other cgroup is present on
|
|
* the tree
|
|
*/
|
|
next_mz =
|
|
__mem_cgroup_largest_soft_limit_node(mctz);
|
|
if (next_mz == mz) {
|
|
css_put(&next_mz->mem->css);
|
|
next_mz = NULL;
|
|
} else /* next_mz == NULL or other memcg */
|
|
break;
|
|
} while (1);
|
|
}
|
|
__mem_cgroup_remove_exceeded(mz->mem, mz, mctz);
|
|
excess = res_counter_soft_limit_excess(&mz->mem->res);
|
|
/*
|
|
* One school of thought says that we should not add
|
|
* back the node to the tree if reclaim returns 0.
|
|
* But our reclaim could return 0, simply because due
|
|
* to priority we are exposing a smaller subset of
|
|
* memory to reclaim from. Consider this as a longer
|
|
* term TODO.
|
|
*/
|
|
/* If excess == 0, no tree ops */
|
|
__mem_cgroup_insert_exceeded(mz->mem, mz, mctz, excess);
|
|
spin_unlock(&mctz->lock);
|
|
css_put(&mz->mem->css);
|
|
loop++;
|
|
/*
|
|
* Could not reclaim anything and there are no more
|
|
* mem cgroups to try or we seem to be looping without
|
|
* reclaiming anything.
|
|
*/
|
|
if (!nr_reclaimed &&
|
|
(next_mz == NULL ||
|
|
loop > MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS))
|
|
break;
|
|
} while (!nr_reclaimed);
|
|
if (next_mz)
|
|
css_put(&next_mz->mem->css);
|
|
return nr_reclaimed;
|
|
}
|
|
|
|
/*
|
|
* This routine traverse page_cgroup in given list and drop them all.
|
|
* *And* this routine doesn't reclaim page itself, just removes page_cgroup.
|
|
*/
|
|
static int mem_cgroup_force_empty_list(struct mem_cgroup *mem,
|
|
int node, int zid, enum lru_list lru)
|
|
{
|
|
struct zone *zone;
|
|
struct mem_cgroup_per_zone *mz;
|
|
struct page_cgroup *pc, *busy;
|
|
unsigned long flags, loop;
|
|
struct list_head *list;
|
|
int ret = 0;
|
|
|
|
zone = &NODE_DATA(node)->node_zones[zid];
|
|
mz = mem_cgroup_zoneinfo(mem, node, zid);
|
|
list = &mz->lists[lru];
|
|
|
|
loop = MEM_CGROUP_ZSTAT(mz, lru);
|
|
/* give some margin against EBUSY etc...*/
|
|
loop += 256;
|
|
busy = NULL;
|
|
while (loop--) {
|
|
ret = 0;
|
|
spin_lock_irqsave(&zone->lru_lock, flags);
|
|
if (list_empty(list)) {
|
|
spin_unlock_irqrestore(&zone->lru_lock, flags);
|
|
break;
|
|
}
|
|
pc = list_entry(list->prev, struct page_cgroup, lru);
|
|
if (busy == pc) {
|
|
list_move(&pc->lru, list);
|
|
busy = NULL;
|
|
spin_unlock_irqrestore(&zone->lru_lock, flags);
|
|
continue;
|
|
}
|
|
spin_unlock_irqrestore(&zone->lru_lock, flags);
|
|
|
|
ret = mem_cgroup_move_parent(pc, mem, GFP_KERNEL);
|
|
if (ret == -ENOMEM)
|
|
break;
|
|
|
|
if (ret == -EBUSY || ret == -EINVAL) {
|
|
/* found lock contention or "pc" is obsolete. */
|
|
busy = pc;
|
|
cond_resched();
|
|
} else
|
|
busy = NULL;
|
|
}
|
|
|
|
if (!ret && !list_empty(list))
|
|
return -EBUSY;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* make mem_cgroup's charge to be 0 if there is no task.
|
|
* This enables deleting this mem_cgroup.
|
|
*/
|
|
static int mem_cgroup_force_empty(struct mem_cgroup *mem, bool free_all)
|
|
{
|
|
int ret;
|
|
int node, zid, shrink;
|
|
int nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
|
|
struct cgroup *cgrp = mem->css.cgroup;
|
|
|
|
css_get(&mem->css);
|
|
|
|
shrink = 0;
|
|
/* should free all ? */
|
|
if (free_all)
|
|
goto try_to_free;
|
|
move_account:
|
|
do {
|
|
ret = -EBUSY;
|
|
if (cgroup_task_count(cgrp) || !list_empty(&cgrp->children))
|
|
goto out;
|
|
ret = -EINTR;
|
|
if (signal_pending(current))
|
|
goto out;
|
|
/* This is for making all *used* pages to be on LRU. */
|
|
lru_add_drain_all();
|
|
drain_all_stock_sync();
|
|
ret = 0;
|
|
for_each_node_state(node, N_HIGH_MEMORY) {
|
|
for (zid = 0; !ret && zid < MAX_NR_ZONES; zid++) {
|
|
enum lru_list l;
|
|
for_each_lru(l) {
|
|
ret = mem_cgroup_force_empty_list(mem,
|
|
node, zid, l);
|
|
if (ret)
|
|
break;
|
|
}
|
|
}
|
|
if (ret)
|
|
break;
|
|
}
|
|
/* it seems parent cgroup doesn't have enough mem */
|
|
if (ret == -ENOMEM)
|
|
goto try_to_free;
|
|
cond_resched();
|
|
/* "ret" should also be checked to ensure all lists are empty. */
|
|
} while (mem->res.usage > 0 || ret);
|
|
out:
|
|
css_put(&mem->css);
|
|
return ret;
|
|
|
|
try_to_free:
|
|
/* returns EBUSY if there is a task or if we come here twice. */
|
|
if (cgroup_task_count(cgrp) || !list_empty(&cgrp->children) || shrink) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
/* we call try-to-free pages for make this cgroup empty */
|
|
lru_add_drain_all();
|
|
/* try to free all pages in this cgroup */
|
|
shrink = 1;
|
|
while (nr_retries && mem->res.usage > 0) {
|
|
int progress;
|
|
|
|
if (signal_pending(current)) {
|
|
ret = -EINTR;
|
|
goto out;
|
|
}
|
|
progress = try_to_free_mem_cgroup_pages(mem, GFP_KERNEL,
|
|
false, get_swappiness(mem));
|
|
if (!progress) {
|
|
nr_retries--;
|
|
/* maybe some writeback is necessary */
|
|
congestion_wait(BLK_RW_ASYNC, HZ/10);
|
|
}
|
|
|
|
}
|
|
lru_add_drain();
|
|
/* try move_account...there may be some *locked* pages. */
|
|
goto move_account;
|
|
}
|
|
|
|
int mem_cgroup_force_empty_write(struct cgroup *cont, unsigned int event)
|
|
{
|
|
return mem_cgroup_force_empty(mem_cgroup_from_cont(cont), true);
|
|
}
|
|
|
|
|
|
static u64 mem_cgroup_hierarchy_read(struct cgroup *cont, struct cftype *cft)
|
|
{
|
|
return mem_cgroup_from_cont(cont)->use_hierarchy;
|
|
}
|
|
|
|
static int mem_cgroup_hierarchy_write(struct cgroup *cont, struct cftype *cft,
|
|
u64 val)
|
|
{
|
|
int retval = 0;
|
|
struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
|
|
struct cgroup *parent = cont->parent;
|
|
struct mem_cgroup *parent_mem = NULL;
|
|
|
|
if (parent)
|
|
parent_mem = mem_cgroup_from_cont(parent);
|
|
|
|
cgroup_lock();
|
|
/*
|
|
* If parent's use_hierarchy is set, we can't make any modifications
|
|
* in the child subtrees. If it is unset, then the change can
|
|
* occur, provided the current cgroup has no children.
|
|
*
|
|
* For the root cgroup, parent_mem is NULL, we allow value to be
|
|
* set if there are no children.
|
|
*/
|
|
if ((!parent_mem || !parent_mem->use_hierarchy) &&
|
|
(val == 1 || val == 0)) {
|
|
if (list_empty(&cont->children))
|
|
mem->use_hierarchy = val;
|
|
else
|
|
retval = -EBUSY;
|
|
} else
|
|
retval = -EINVAL;
|
|
cgroup_unlock();
|
|
|
|
return retval;
|
|
}
|
|
|
|
struct mem_cgroup_idx_data {
|
|
s64 val;
|
|
enum mem_cgroup_stat_index idx;
|
|
};
|
|
|
|
static int
|
|
mem_cgroup_get_idx_stat(struct mem_cgroup *mem, void *data)
|
|
{
|
|
struct mem_cgroup_idx_data *d = data;
|
|
d->val += mem_cgroup_read_stat(mem, d->idx);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
mem_cgroup_get_recursive_idx_stat(struct mem_cgroup *mem,
|
|
enum mem_cgroup_stat_index idx, s64 *val)
|
|
{
|
|
struct mem_cgroup_idx_data d;
|
|
d.idx = idx;
|
|
d.val = 0;
|
|
mem_cgroup_walk_tree(mem, &d, mem_cgroup_get_idx_stat);
|
|
*val = d.val;
|
|
}
|
|
|
|
static inline u64 mem_cgroup_usage(struct mem_cgroup *mem, bool swap)
|
|
{
|
|
u64 idx_val, val;
|
|
|
|
if (!mem_cgroup_is_root(mem)) {
|
|
if (!swap)
|
|
return res_counter_read_u64(&mem->res, RES_USAGE);
|
|
else
|
|
return res_counter_read_u64(&mem->memsw, RES_USAGE);
|
|
}
|
|
|
|
mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_CACHE, &idx_val);
|
|
val = idx_val;
|
|
mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_RSS, &idx_val);
|
|
val += idx_val;
|
|
|
|
if (swap) {
|
|
mem_cgroup_get_recursive_idx_stat(mem,
|
|
MEM_CGROUP_STAT_SWAPOUT, &idx_val);
|
|
val += idx_val;
|
|
}
|
|
|
|
return val << PAGE_SHIFT;
|
|
}
|
|
|
|
static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
|
|
{
|
|
struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
|
|
u64 val;
|
|
int type, name;
|
|
|
|
type = MEMFILE_TYPE(cft->private);
|
|
name = MEMFILE_ATTR(cft->private);
|
|
switch (type) {
|
|
case _MEM:
|
|
if (name == RES_USAGE)
|
|
val = mem_cgroup_usage(mem, false);
|
|
else
|
|
val = res_counter_read_u64(&mem->res, name);
|
|
break;
|
|
case _MEMSWAP:
|
|
if (name == RES_USAGE)
|
|
val = mem_cgroup_usage(mem, true);
|
|
else
|
|
val = res_counter_read_u64(&mem->memsw, name);
|
|
break;
|
|
default:
|
|
BUG();
|
|
break;
|
|
}
|
|
return val;
|
|
}
|
|
/*
|
|
* The user of this function is...
|
|
* RES_LIMIT.
|
|
*/
|
|
static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
|
|
const char *buffer)
|
|
{
|
|
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
|
|
int type, name;
|
|
unsigned long long val;
|
|
int ret;
|
|
|
|
type = MEMFILE_TYPE(cft->private);
|
|
name = MEMFILE_ATTR(cft->private);
|
|
switch (name) {
|
|
case RES_LIMIT:
|
|
if (mem_cgroup_is_root(memcg)) { /* Can't set limit on root */
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
/* This function does all necessary parse...reuse it */
|
|
ret = res_counter_memparse_write_strategy(buffer, &val);
|
|
if (ret)
|
|
break;
|
|
if (type == _MEM)
|
|
ret = mem_cgroup_resize_limit(memcg, val);
|
|
else
|
|
ret = mem_cgroup_resize_memsw_limit(memcg, val);
|
|
break;
|
|
case RES_SOFT_LIMIT:
|
|
ret = res_counter_memparse_write_strategy(buffer, &val);
|
|
if (ret)
|
|
break;
|
|
/*
|
|
* For memsw, soft limits are hard to implement in terms
|
|
* of semantics, for now, we support soft limits for
|
|
* control without swap
|
|
*/
|
|
if (type == _MEM)
|
|
ret = res_counter_set_soft_limit(&memcg->res, val);
|
|
else
|
|
ret = -EINVAL;
|
|
break;
|
|
default:
|
|
ret = -EINVAL; /* should be BUG() ? */
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void memcg_get_hierarchical_limit(struct mem_cgroup *memcg,
|
|
unsigned long long *mem_limit, unsigned long long *memsw_limit)
|
|
{
|
|
struct cgroup *cgroup;
|
|
unsigned long long min_limit, min_memsw_limit, tmp;
|
|
|
|
min_limit = res_counter_read_u64(&memcg->res, RES_LIMIT);
|
|
min_memsw_limit = res_counter_read_u64(&memcg->memsw, RES_LIMIT);
|
|
cgroup = memcg->css.cgroup;
|
|
if (!memcg->use_hierarchy)
|
|
goto out;
|
|
|
|
while (cgroup->parent) {
|
|
cgroup = cgroup->parent;
|
|
memcg = mem_cgroup_from_cont(cgroup);
|
|
if (!memcg->use_hierarchy)
|
|
break;
|
|
tmp = res_counter_read_u64(&memcg->res, RES_LIMIT);
|
|
min_limit = min(min_limit, tmp);
|
|
tmp = res_counter_read_u64(&memcg->memsw, RES_LIMIT);
|
|
min_memsw_limit = min(min_memsw_limit, tmp);
|
|
}
|
|
out:
|
|
*mem_limit = min_limit;
|
|
*memsw_limit = min_memsw_limit;
|
|
return;
|
|
}
|
|
|
|
static int mem_cgroup_reset(struct cgroup *cont, unsigned int event)
|
|
{
|
|
struct mem_cgroup *mem;
|
|
int type, name;
|
|
|
|
mem = mem_cgroup_from_cont(cont);
|
|
type = MEMFILE_TYPE(event);
|
|
name = MEMFILE_ATTR(event);
|
|
switch (name) {
|
|
case RES_MAX_USAGE:
|
|
if (type == _MEM)
|
|
res_counter_reset_max(&mem->res);
|
|
else
|
|
res_counter_reset_max(&mem->memsw);
|
|
break;
|
|
case RES_FAILCNT:
|
|
if (type == _MEM)
|
|
res_counter_reset_failcnt(&mem->res);
|
|
else
|
|
res_counter_reset_failcnt(&mem->memsw);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u64 mem_cgroup_move_charge_read(struct cgroup *cgrp,
|
|
struct cftype *cft)
|
|
{
|
|
return mem_cgroup_from_cont(cgrp)->move_charge_at_immigrate;
|
|
}
|
|
|
|
#ifdef CONFIG_MMU
|
|
static int mem_cgroup_move_charge_write(struct cgroup *cgrp,
|
|
struct cftype *cft, u64 val)
|
|
{
|
|
struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp);
|
|
|
|
if (val >= (1 << NR_MOVE_TYPE))
|
|
return -EINVAL;
|
|
/*
|
|
* We check this value several times in both in can_attach() and
|
|
* attach(), so we need cgroup lock to prevent this value from being
|
|
* inconsistent.
|
|
*/
|
|
cgroup_lock();
|
|
mem->move_charge_at_immigrate = val;
|
|
cgroup_unlock();
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
static int mem_cgroup_move_charge_write(struct cgroup *cgrp,
|
|
struct cftype *cft, u64 val)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
#endif
|
|
|
|
|
|
/* For read statistics */
|
|
enum {
|
|
MCS_CACHE,
|
|
MCS_RSS,
|
|
MCS_FILE_MAPPED,
|
|
MCS_PGPGIN,
|
|
MCS_PGPGOUT,
|
|
MCS_SWAP,
|
|
MCS_INACTIVE_ANON,
|
|
MCS_ACTIVE_ANON,
|
|
MCS_INACTIVE_FILE,
|
|
MCS_ACTIVE_FILE,
|
|
MCS_UNEVICTABLE,
|
|
NR_MCS_STAT,
|
|
};
|
|
|
|
struct mcs_total_stat {
|
|
s64 stat[NR_MCS_STAT];
|
|
};
|
|
|
|
struct {
|
|
char *local_name;
|
|
char *total_name;
|
|
} memcg_stat_strings[NR_MCS_STAT] = {
|
|
{"cache", "total_cache"},
|
|
{"rss", "total_rss"},
|
|
{"mapped_file", "total_mapped_file"},
|
|
{"pgpgin", "total_pgpgin"},
|
|
{"pgpgout", "total_pgpgout"},
|
|
{"swap", "total_swap"},
|
|
{"inactive_anon", "total_inactive_anon"},
|
|
{"active_anon", "total_active_anon"},
|
|
{"inactive_file", "total_inactive_file"},
|
|
{"active_file", "total_active_file"},
|
|
{"unevictable", "total_unevictable"}
|
|
};
|
|
|
|
|
|
static int mem_cgroup_get_local_stat(struct mem_cgroup *mem, void *data)
|
|
{
|
|
struct mcs_total_stat *s = data;
|
|
s64 val;
|
|
|
|
/* per cpu stat */
|
|
val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_CACHE);
|
|
s->stat[MCS_CACHE] += val * PAGE_SIZE;
|
|
val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_RSS);
|
|
s->stat[MCS_RSS] += val * PAGE_SIZE;
|
|
val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_FILE_MAPPED);
|
|
s->stat[MCS_FILE_MAPPED] += val * PAGE_SIZE;
|
|
val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_PGPGIN_COUNT);
|
|
s->stat[MCS_PGPGIN] += val;
|
|
val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_PGPGOUT_COUNT);
|
|
s->stat[MCS_PGPGOUT] += val;
|
|
if (do_swap_account) {
|
|
val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_SWAPOUT);
|
|
s->stat[MCS_SWAP] += val * PAGE_SIZE;
|
|
}
|
|
|
|
/* per zone stat */
|
|
val = mem_cgroup_get_local_zonestat(mem, LRU_INACTIVE_ANON);
|
|
s->stat[MCS_INACTIVE_ANON] += val * PAGE_SIZE;
|
|
val = mem_cgroup_get_local_zonestat(mem, LRU_ACTIVE_ANON);
|
|
s->stat[MCS_ACTIVE_ANON] += val * PAGE_SIZE;
|
|
val = mem_cgroup_get_local_zonestat(mem, LRU_INACTIVE_FILE);
|
|
s->stat[MCS_INACTIVE_FILE] += val * PAGE_SIZE;
|
|
val = mem_cgroup_get_local_zonestat(mem, LRU_ACTIVE_FILE);
|
|
s->stat[MCS_ACTIVE_FILE] += val * PAGE_SIZE;
|
|
val = mem_cgroup_get_local_zonestat(mem, LRU_UNEVICTABLE);
|
|
s->stat[MCS_UNEVICTABLE] += val * PAGE_SIZE;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
mem_cgroup_get_total_stat(struct mem_cgroup *mem, struct mcs_total_stat *s)
|
|
{
|
|
mem_cgroup_walk_tree(mem, s, mem_cgroup_get_local_stat);
|
|
}
|
|
|
|
static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,
|
|
struct cgroup_map_cb *cb)
|
|
{
|
|
struct mem_cgroup *mem_cont = mem_cgroup_from_cont(cont);
|
|
struct mcs_total_stat mystat;
|
|
int i;
|
|
|
|
memset(&mystat, 0, sizeof(mystat));
|
|
mem_cgroup_get_local_stat(mem_cont, &mystat);
|
|
|
|
for (i = 0; i < NR_MCS_STAT; i++) {
|
|
if (i == MCS_SWAP && !do_swap_account)
|
|
continue;
|
|
cb->fill(cb, memcg_stat_strings[i].local_name, mystat.stat[i]);
|
|
}
|
|
|
|
/* Hierarchical information */
|
|
{
|
|
unsigned long long limit, memsw_limit;
|
|
memcg_get_hierarchical_limit(mem_cont, &limit, &memsw_limit);
|
|
cb->fill(cb, "hierarchical_memory_limit", limit);
|
|
if (do_swap_account)
|
|
cb->fill(cb, "hierarchical_memsw_limit", memsw_limit);
|
|
}
|
|
|
|
memset(&mystat, 0, sizeof(mystat));
|
|
mem_cgroup_get_total_stat(mem_cont, &mystat);
|
|
for (i = 0; i < NR_MCS_STAT; i++) {
|
|
if (i == MCS_SWAP && !do_swap_account)
|
|
continue;
|
|
cb->fill(cb, memcg_stat_strings[i].total_name, mystat.stat[i]);
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_VM
|
|
cb->fill(cb, "inactive_ratio", calc_inactive_ratio(mem_cont, NULL));
|
|
|
|
{
|
|
int nid, zid;
|
|
struct mem_cgroup_per_zone *mz;
|
|
unsigned long recent_rotated[2] = {0, 0};
|
|
unsigned long recent_scanned[2] = {0, 0};
|
|
|
|
for_each_online_node(nid)
|
|
for (zid = 0; zid < MAX_NR_ZONES; zid++) {
|
|
mz = mem_cgroup_zoneinfo(mem_cont, nid, zid);
|
|
|
|
recent_rotated[0] +=
|
|
mz->reclaim_stat.recent_rotated[0];
|
|
recent_rotated[1] +=
|
|
mz->reclaim_stat.recent_rotated[1];
|
|
recent_scanned[0] +=
|
|
mz->reclaim_stat.recent_scanned[0];
|
|
recent_scanned[1] +=
|
|
mz->reclaim_stat.recent_scanned[1];
|
|
}
|
|
cb->fill(cb, "recent_rotated_anon", recent_rotated[0]);
|
|
cb->fill(cb, "recent_rotated_file", recent_rotated[1]);
|
|
cb->fill(cb, "recent_scanned_anon", recent_scanned[0]);
|
|
cb->fill(cb, "recent_scanned_file", recent_scanned[1]);
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u64 mem_cgroup_swappiness_read(struct cgroup *cgrp, struct cftype *cft)
|
|
{
|
|
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
|
|
|
|
return get_swappiness(memcg);
|
|
}
|
|
|
|
static int mem_cgroup_swappiness_write(struct cgroup *cgrp, struct cftype *cft,
|
|
u64 val)
|
|
{
|
|
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
|
|
struct mem_cgroup *parent;
|
|
|
|
if (val > 100)
|
|
return -EINVAL;
|
|
|
|
if (cgrp->parent == NULL)
|
|
return -EINVAL;
|
|
|
|
parent = mem_cgroup_from_cont(cgrp->parent);
|
|
|
|
cgroup_lock();
|
|
|
|
/* If under hierarchy, only empty-root can set this value */
|
|
if ((parent->use_hierarchy) ||
|
|
(memcg->use_hierarchy && !list_empty(&cgrp->children))) {
|
|
cgroup_unlock();
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock(&memcg->reclaim_param_lock);
|
|
memcg->swappiness = val;
|
|
spin_unlock(&memcg->reclaim_param_lock);
|
|
|
|
cgroup_unlock();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __mem_cgroup_threshold(struct mem_cgroup *memcg, bool swap)
|
|
{
|
|
struct mem_cgroup_threshold_ary *t;
|
|
u64 usage;
|
|
int i;
|
|
|
|
rcu_read_lock();
|
|
if (!swap)
|
|
t = rcu_dereference(memcg->thresholds);
|
|
else
|
|
t = rcu_dereference(memcg->memsw_thresholds);
|
|
|
|
if (!t)
|
|
goto unlock;
|
|
|
|
usage = mem_cgroup_usage(memcg, swap);
|
|
|
|
/*
|
|
* current_threshold points to threshold just below usage.
|
|
* If it's not true, a threshold was crossed after last
|
|
* call of __mem_cgroup_threshold().
|
|
*/
|
|
i = atomic_read(&t->current_threshold);
|
|
|
|
/*
|
|
* Iterate backward over array of thresholds starting from
|
|
* current_threshold and check if a threshold is crossed.
|
|
* If none of thresholds below usage is crossed, we read
|
|
* only one element of the array here.
|
|
*/
|
|
for (; i >= 0 && unlikely(t->entries[i].threshold > usage); i--)
|
|
eventfd_signal(t->entries[i].eventfd, 1);
|
|
|
|
/* i = current_threshold + 1 */
|
|
i++;
|
|
|
|
/*
|
|
* Iterate forward over array of thresholds starting from
|
|
* current_threshold+1 and check if a threshold is crossed.
|
|
* If none of thresholds above usage is crossed, we read
|
|
* only one element of the array here.
|
|
*/
|
|
for (; i < t->size && unlikely(t->entries[i].threshold <= usage); i++)
|
|
eventfd_signal(t->entries[i].eventfd, 1);
|
|
|
|
/* Update current_threshold */
|
|
atomic_set(&t->current_threshold, i - 1);
|
|
unlock:
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void mem_cgroup_threshold(struct mem_cgroup *memcg)
|
|
{
|
|
__mem_cgroup_threshold(memcg, false);
|
|
if (do_swap_account)
|
|
__mem_cgroup_threshold(memcg, true);
|
|
}
|
|
|
|
static int compare_thresholds(const void *a, const void *b)
|
|
{
|
|
const struct mem_cgroup_threshold *_a = a;
|
|
const struct mem_cgroup_threshold *_b = b;
|
|
|
|
return _a->threshold - _b->threshold;
|
|
}
|
|
|
|
static int mem_cgroup_register_event(struct cgroup *cgrp, struct cftype *cft,
|
|
struct eventfd_ctx *eventfd, const char *args)
|
|
{
|
|
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
|
|
struct mem_cgroup_threshold_ary *thresholds, *thresholds_new;
|
|
int type = MEMFILE_TYPE(cft->private);
|
|
u64 threshold, usage;
|
|
int size;
|
|
int i, ret;
|
|
|
|
ret = res_counter_memparse_write_strategy(args, &threshold);
|
|
if (ret)
|
|
return ret;
|
|
|
|
mutex_lock(&memcg->thresholds_lock);
|
|
if (type == _MEM)
|
|
thresholds = memcg->thresholds;
|
|
else if (type == _MEMSWAP)
|
|
thresholds = memcg->memsw_thresholds;
|
|
else
|
|
BUG();
|
|
|
|
usage = mem_cgroup_usage(memcg, type == _MEMSWAP);
|
|
|
|
/* Check if a threshold crossed before adding a new one */
|
|
if (thresholds)
|
|
__mem_cgroup_threshold(memcg, type == _MEMSWAP);
|
|
|
|
if (thresholds)
|
|
size = thresholds->size + 1;
|
|
else
|
|
size = 1;
|
|
|
|
/* Allocate memory for new array of thresholds */
|
|
thresholds_new = kmalloc(sizeof(*thresholds_new) +
|
|
size * sizeof(struct mem_cgroup_threshold),
|
|
GFP_KERNEL);
|
|
if (!thresholds_new) {
|
|
ret = -ENOMEM;
|
|
goto unlock;
|
|
}
|
|
thresholds_new->size = size;
|
|
|
|
/* Copy thresholds (if any) to new array */
|
|
if (thresholds)
|
|
memcpy(thresholds_new->entries, thresholds->entries,
|
|
thresholds->size *
|
|
sizeof(struct mem_cgroup_threshold));
|
|
/* Add new threshold */
|
|
thresholds_new->entries[size - 1].eventfd = eventfd;
|
|
thresholds_new->entries[size - 1].threshold = threshold;
|
|
|
|
/* Sort thresholds. Registering of new threshold isn't time-critical */
|
|
sort(thresholds_new->entries, size,
|
|
sizeof(struct mem_cgroup_threshold),
|
|
compare_thresholds, NULL);
|
|
|
|
/* Find current threshold */
|
|
atomic_set(&thresholds_new->current_threshold, -1);
|
|
for (i = 0; i < size; i++) {
|
|
if (thresholds_new->entries[i].threshold < usage) {
|
|
/*
|
|
* thresholds_new->current_threshold will not be used
|
|
* until rcu_assign_pointer(), so it's safe to increment
|
|
* it here.
|
|
*/
|
|
atomic_inc(&thresholds_new->current_threshold);
|
|
}
|
|
}
|
|
|
|
if (type == _MEM)
|
|
rcu_assign_pointer(memcg->thresholds, thresholds_new);
|
|
else
|
|
rcu_assign_pointer(memcg->memsw_thresholds, thresholds_new);
|
|
|
|
/* To be sure that nobody uses thresholds before freeing it */
|
|
synchronize_rcu();
|
|
|
|
kfree(thresholds);
|
|
unlock:
|
|
mutex_unlock(&memcg->thresholds_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mem_cgroup_unregister_event(struct cgroup *cgrp, struct cftype *cft,
|
|
struct eventfd_ctx *eventfd)
|
|
{
|
|
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
|
|
struct mem_cgroup_threshold_ary *thresholds, *thresholds_new;
|
|
int type = MEMFILE_TYPE(cft->private);
|
|
u64 usage;
|
|
int size = 0;
|
|
int i, j, ret;
|
|
|
|
mutex_lock(&memcg->thresholds_lock);
|
|
if (type == _MEM)
|
|
thresholds = memcg->thresholds;
|
|
else if (type == _MEMSWAP)
|
|
thresholds = memcg->memsw_thresholds;
|
|
else
|
|
BUG();
|
|
|
|
/*
|
|
* Something went wrong if we trying to unregister a threshold
|
|
* if we don't have thresholds
|
|
*/
|
|
BUG_ON(!thresholds);
|
|
|
|
usage = mem_cgroup_usage(memcg, type == _MEMSWAP);
|
|
|
|
/* Check if a threshold crossed before removing */
|
|
__mem_cgroup_threshold(memcg, type == _MEMSWAP);
|
|
|
|
/* Calculate new number of threshold */
|
|
for (i = 0; i < thresholds->size; i++) {
|
|
if (thresholds->entries[i].eventfd != eventfd)
|
|
size++;
|
|
}
|
|
|
|
/* Set thresholds array to NULL if we don't have thresholds */
|
|
if (!size) {
|
|
thresholds_new = NULL;
|
|
goto assign;
|
|
}
|
|
|
|
/* Allocate memory for new array of thresholds */
|
|
thresholds_new = kmalloc(sizeof(*thresholds_new) +
|
|
size * sizeof(struct mem_cgroup_threshold),
|
|
GFP_KERNEL);
|
|
if (!thresholds_new) {
|
|
ret = -ENOMEM;
|
|
goto unlock;
|
|
}
|
|
thresholds_new->size = size;
|
|
|
|
/* Copy thresholds and find current threshold */
|
|
atomic_set(&thresholds_new->current_threshold, -1);
|
|
for (i = 0, j = 0; i < thresholds->size; i++) {
|
|
if (thresholds->entries[i].eventfd == eventfd)
|
|
continue;
|
|
|
|
thresholds_new->entries[j] = thresholds->entries[i];
|
|
if (thresholds_new->entries[j].threshold < usage) {
|
|
/*
|
|
* thresholds_new->current_threshold will not be used
|
|
* until rcu_assign_pointer(), so it's safe to increment
|
|
* it here.
|
|
*/
|
|
atomic_inc(&thresholds_new->current_threshold);
|
|
}
|
|
j++;
|
|
}
|
|
|
|
assign:
|
|
if (type == _MEM)
|
|
rcu_assign_pointer(memcg->thresholds, thresholds_new);
|
|
else
|
|
rcu_assign_pointer(memcg->memsw_thresholds, thresholds_new);
|
|
|
|
/* To be sure that nobody uses thresholds before freeing it */
|
|
synchronize_rcu();
|
|
|
|
kfree(thresholds);
|
|
unlock:
|
|
mutex_unlock(&memcg->thresholds_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct cftype mem_cgroup_files[] = {
|
|
{
|
|
.name = "usage_in_bytes",
|
|
.private = MEMFILE_PRIVATE(_MEM, RES_USAGE),
|
|
.read_u64 = mem_cgroup_read,
|
|
.register_event = mem_cgroup_register_event,
|
|
.unregister_event = mem_cgroup_unregister_event,
|
|
},
|
|
{
|
|
.name = "max_usage_in_bytes",
|
|
.private = MEMFILE_PRIVATE(_MEM, RES_MAX_USAGE),
|
|
.trigger = mem_cgroup_reset,
|
|
.read_u64 = mem_cgroup_read,
|
|
},
|
|
{
|
|
.name = "limit_in_bytes",
|
|
.private = MEMFILE_PRIVATE(_MEM, RES_LIMIT),
|
|
.write_string = mem_cgroup_write,
|
|
.read_u64 = mem_cgroup_read,
|
|
},
|
|
{
|
|
.name = "soft_limit_in_bytes",
|
|
.private = MEMFILE_PRIVATE(_MEM, RES_SOFT_LIMIT),
|
|
.write_string = mem_cgroup_write,
|
|
.read_u64 = mem_cgroup_read,
|
|
},
|
|
{
|
|
.name = "failcnt",
|
|
.private = MEMFILE_PRIVATE(_MEM, RES_FAILCNT),
|
|
.trigger = mem_cgroup_reset,
|
|
.read_u64 = mem_cgroup_read,
|
|
},
|
|
{
|
|
.name = "stat",
|
|
.read_map = mem_control_stat_show,
|
|
},
|
|
{
|
|
.name = "force_empty",
|
|
.trigger = mem_cgroup_force_empty_write,
|
|
},
|
|
{
|
|
.name = "use_hierarchy",
|
|
.write_u64 = mem_cgroup_hierarchy_write,
|
|
.read_u64 = mem_cgroup_hierarchy_read,
|
|
},
|
|
{
|
|
.name = "swappiness",
|
|
.read_u64 = mem_cgroup_swappiness_read,
|
|
.write_u64 = mem_cgroup_swappiness_write,
|
|
},
|
|
{
|
|
.name = "move_charge_at_immigrate",
|
|
.read_u64 = mem_cgroup_move_charge_read,
|
|
.write_u64 = mem_cgroup_move_charge_write,
|
|
},
|
|
};
|
|
|
|
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
|
|
static struct cftype memsw_cgroup_files[] = {
|
|
{
|
|
.name = "memsw.usage_in_bytes",
|
|
.private = MEMFILE_PRIVATE(_MEMSWAP, RES_USAGE),
|
|
.read_u64 = mem_cgroup_read,
|
|
.register_event = mem_cgroup_register_event,
|
|
.unregister_event = mem_cgroup_unregister_event,
|
|
},
|
|
{
|
|
.name = "memsw.max_usage_in_bytes",
|
|
.private = MEMFILE_PRIVATE(_MEMSWAP, RES_MAX_USAGE),
|
|
.trigger = mem_cgroup_reset,
|
|
.read_u64 = mem_cgroup_read,
|
|
},
|
|
{
|
|
.name = "memsw.limit_in_bytes",
|
|
.private = MEMFILE_PRIVATE(_MEMSWAP, RES_LIMIT),
|
|
.write_string = mem_cgroup_write,
|
|
.read_u64 = mem_cgroup_read,
|
|
},
|
|
{
|
|
.name = "memsw.failcnt",
|
|
.private = MEMFILE_PRIVATE(_MEMSWAP, RES_FAILCNT),
|
|
.trigger = mem_cgroup_reset,
|
|
.read_u64 = mem_cgroup_read,
|
|
},
|
|
};
|
|
|
|
static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss)
|
|
{
|
|
if (!do_swap_account)
|
|
return 0;
|
|
return cgroup_add_files(cont, ss, memsw_cgroup_files,
|
|
ARRAY_SIZE(memsw_cgroup_files));
|
|
};
|
|
#else
|
|
static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
|
|
{
|
|
struct mem_cgroup_per_node *pn;
|
|
struct mem_cgroup_per_zone *mz;
|
|
enum lru_list l;
|
|
int zone, tmp = node;
|
|
/*
|
|
* This routine is called against possible nodes.
|
|
* But it's BUG to call kmalloc() against offline node.
|
|
*
|
|
* TODO: this routine can waste much memory for nodes which will
|
|
* never be onlined. It's better to use memory hotplug callback
|
|
* function.
|
|
*/
|
|
if (!node_state(node, N_NORMAL_MEMORY))
|
|
tmp = -1;
|
|
pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, tmp);
|
|
if (!pn)
|
|
return 1;
|
|
|
|
mem->info.nodeinfo[node] = pn;
|
|
memset(pn, 0, sizeof(*pn));
|
|
|
|
for (zone = 0; zone < MAX_NR_ZONES; zone++) {
|
|
mz = &pn->zoneinfo[zone];
|
|
for_each_lru(l)
|
|
INIT_LIST_HEAD(&mz->lists[l]);
|
|
mz->usage_in_excess = 0;
|
|
mz->on_tree = false;
|
|
mz->mem = mem;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void free_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
|
|
{
|
|
kfree(mem->info.nodeinfo[node]);
|
|
}
|
|
|
|
static struct mem_cgroup *mem_cgroup_alloc(void)
|
|
{
|
|
struct mem_cgroup *mem;
|
|
int size = sizeof(struct mem_cgroup);
|
|
|
|
/* Can be very big if MAX_NUMNODES is very big */
|
|
if (size < PAGE_SIZE)
|
|
mem = kmalloc(size, GFP_KERNEL);
|
|
else
|
|
mem = vmalloc(size);
|
|
|
|
if (mem)
|
|
memset(mem, 0, size);
|
|
mem->stat = alloc_percpu(struct mem_cgroup_stat_cpu);
|
|
if (!mem->stat) {
|
|
if (size < PAGE_SIZE)
|
|
kfree(mem);
|
|
else
|
|
vfree(mem);
|
|
mem = NULL;
|
|
}
|
|
return mem;
|
|
}
|
|
|
|
/*
|
|
* At destroying mem_cgroup, references from swap_cgroup can remain.
|
|
* (scanning all at force_empty is too costly...)
|
|
*
|
|
* Instead of clearing all references at force_empty, we remember
|
|
* the number of reference from swap_cgroup and free mem_cgroup when
|
|
* it goes down to 0.
|
|
*
|
|
* Removal of cgroup itself succeeds regardless of refs from swap.
|
|
*/
|
|
|
|
static void __mem_cgroup_free(struct mem_cgroup *mem)
|
|
{
|
|
int node;
|
|
|
|
mem_cgroup_remove_from_trees(mem);
|
|
free_css_id(&mem_cgroup_subsys, &mem->css);
|
|
|
|
for_each_node_state(node, N_POSSIBLE)
|
|
free_mem_cgroup_per_zone_info(mem, node);
|
|
|
|
free_percpu(mem->stat);
|
|
if (sizeof(struct mem_cgroup) < PAGE_SIZE)
|
|
kfree(mem);
|
|
else
|
|
vfree(mem);
|
|
}
|
|
|
|
static void mem_cgroup_get(struct mem_cgroup *mem)
|
|
{
|
|
atomic_inc(&mem->refcnt);
|
|
}
|
|
|
|
static void __mem_cgroup_put(struct mem_cgroup *mem, int count)
|
|
{
|
|
if (atomic_sub_and_test(count, &mem->refcnt)) {
|
|
struct mem_cgroup *parent = parent_mem_cgroup(mem);
|
|
__mem_cgroup_free(mem);
|
|
if (parent)
|
|
mem_cgroup_put(parent);
|
|
}
|
|
}
|
|
|
|
static void mem_cgroup_put(struct mem_cgroup *mem)
|
|
{
|
|
__mem_cgroup_put(mem, 1);
|
|
}
|
|
|
|
/*
|
|
* Returns the parent mem_cgroup in memcgroup hierarchy with hierarchy enabled.
|
|
*/
|
|
static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem)
|
|
{
|
|
if (!mem->res.parent)
|
|
return NULL;
|
|
return mem_cgroup_from_res_counter(mem->res.parent, res);
|
|
}
|
|
|
|
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
|
|
static void __init enable_swap_cgroup(void)
|
|
{
|
|
if (!mem_cgroup_disabled() && really_do_swap_account)
|
|
do_swap_account = 1;
|
|
}
|
|
#else
|
|
static void __init enable_swap_cgroup(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static int mem_cgroup_soft_limit_tree_init(void)
|
|
{
|
|
struct mem_cgroup_tree_per_node *rtpn;
|
|
struct mem_cgroup_tree_per_zone *rtpz;
|
|
int tmp, node, zone;
|
|
|
|
for_each_node_state(node, N_POSSIBLE) {
|
|
tmp = node;
|
|
if (!node_state(node, N_NORMAL_MEMORY))
|
|
tmp = -1;
|
|
rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, tmp);
|
|
if (!rtpn)
|
|
return 1;
|
|
|
|
soft_limit_tree.rb_tree_per_node[node] = rtpn;
|
|
|
|
for (zone = 0; zone < MAX_NR_ZONES; zone++) {
|
|
rtpz = &rtpn->rb_tree_per_zone[zone];
|
|
rtpz->rb_root = RB_ROOT;
|
|
spin_lock_init(&rtpz->lock);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct cgroup_subsys_state * __ref
|
|
mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
|
|
{
|
|
struct mem_cgroup *mem, *parent;
|
|
long error = -ENOMEM;
|
|
int node;
|
|
|
|
mem = mem_cgroup_alloc();
|
|
if (!mem)
|
|
return ERR_PTR(error);
|
|
|
|
for_each_node_state(node, N_POSSIBLE)
|
|
if (alloc_mem_cgroup_per_zone_info(mem, node))
|
|
goto free_out;
|
|
|
|
/* root ? */
|
|
if (cont->parent == NULL) {
|
|
int cpu;
|
|
enable_swap_cgroup();
|
|
parent = NULL;
|
|
root_mem_cgroup = mem;
|
|
if (mem_cgroup_soft_limit_tree_init())
|
|
goto free_out;
|
|
for_each_possible_cpu(cpu) {
|
|
struct memcg_stock_pcp *stock =
|
|
&per_cpu(memcg_stock, cpu);
|
|
INIT_WORK(&stock->work, drain_local_stock);
|
|
}
|
|
hotcpu_notifier(memcg_stock_cpu_callback, 0);
|
|
} else {
|
|
parent = mem_cgroup_from_cont(cont->parent);
|
|
mem->use_hierarchy = parent->use_hierarchy;
|
|
}
|
|
|
|
if (parent && parent->use_hierarchy) {
|
|
res_counter_init(&mem->res, &parent->res);
|
|
res_counter_init(&mem->memsw, &parent->memsw);
|
|
/*
|
|
* We increment refcnt of the parent to ensure that we can
|
|
* safely access it on res_counter_charge/uncharge.
|
|
* This refcnt will be decremented when freeing this
|
|
* mem_cgroup(see mem_cgroup_put).
|
|
*/
|
|
mem_cgroup_get(parent);
|
|
} else {
|
|
res_counter_init(&mem->res, NULL);
|
|
res_counter_init(&mem->memsw, NULL);
|
|
}
|
|
mem->last_scanned_child = 0;
|
|
spin_lock_init(&mem->reclaim_param_lock);
|
|
|
|
if (parent)
|
|
mem->swappiness = get_swappiness(parent);
|
|
atomic_set(&mem->refcnt, 1);
|
|
mem->move_charge_at_immigrate = 0;
|
|
mutex_init(&mem->thresholds_lock);
|
|
return &mem->css;
|
|
free_out:
|
|
__mem_cgroup_free(mem);
|
|
root_mem_cgroup = NULL;
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
static int mem_cgroup_pre_destroy(struct cgroup_subsys *ss,
|
|
struct cgroup *cont)
|
|
{
|
|
struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
|
|
|
|
return mem_cgroup_force_empty(mem, false);
|
|
}
|
|
|
|
static void mem_cgroup_destroy(struct cgroup_subsys *ss,
|
|
struct cgroup *cont)
|
|
{
|
|
struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
|
|
|
|
mem_cgroup_put(mem);
|
|
}
|
|
|
|
static int mem_cgroup_populate(struct cgroup_subsys *ss,
|
|
struct cgroup *cont)
|
|
{
|
|
int ret;
|
|
|
|
ret = cgroup_add_files(cont, ss, mem_cgroup_files,
|
|
ARRAY_SIZE(mem_cgroup_files));
|
|
|
|
if (!ret)
|
|
ret = register_memsw_files(cont, ss);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_MMU
|
|
/* Handlers for move charge at task migration. */
|
|
#define PRECHARGE_COUNT_AT_ONCE 256
|
|
static int mem_cgroup_do_precharge(unsigned long count)
|
|
{
|
|
int ret = 0;
|
|
int batch_count = PRECHARGE_COUNT_AT_ONCE;
|
|
struct mem_cgroup *mem = mc.to;
|
|
|
|
if (mem_cgroup_is_root(mem)) {
|
|
mc.precharge += count;
|
|
/* we don't need css_get for root */
|
|
return ret;
|
|
}
|
|
/* try to charge at once */
|
|
if (count > 1) {
|
|
struct res_counter *dummy;
|
|
/*
|
|
* "mem" cannot be under rmdir() because we've already checked
|
|
* by cgroup_lock_live_cgroup() that it is not removed and we
|
|
* are still under the same cgroup_mutex. So we can postpone
|
|
* css_get().
|
|
*/
|
|
if (res_counter_charge(&mem->res, PAGE_SIZE * count, &dummy))
|
|
goto one_by_one;
|
|
if (do_swap_account && res_counter_charge(&mem->memsw,
|
|
PAGE_SIZE * count, &dummy)) {
|
|
res_counter_uncharge(&mem->res, PAGE_SIZE * count);
|
|
goto one_by_one;
|
|
}
|
|
mc.precharge += count;
|
|
VM_BUG_ON(test_bit(CSS_ROOT, &mem->css.flags));
|
|
WARN_ON_ONCE(count > INT_MAX);
|
|
__css_get(&mem->css, (int)count);
|
|
return ret;
|
|
}
|
|
one_by_one:
|
|
/* fall back to one by one charge */
|
|
while (count--) {
|
|
if (signal_pending(current)) {
|
|
ret = -EINTR;
|
|
break;
|
|
}
|
|
if (!batch_count--) {
|
|
batch_count = PRECHARGE_COUNT_AT_ONCE;
|
|
cond_resched();
|
|
}
|
|
ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem, false);
|
|
if (ret || !mem)
|
|
/* mem_cgroup_clear_mc() will do uncharge later */
|
|
return -ENOMEM;
|
|
mc.precharge++;
|
|
}
|
|
return ret;
|
|
}
|
|
#else /* !CONFIG_MMU */
|
|
static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
|
|
struct cgroup *cgroup,
|
|
struct task_struct *p,
|
|
bool threadgroup)
|
|
{
|
|
return 0;
|
|
}
|
|
static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss,
|
|
struct cgroup *cgroup,
|
|
struct task_struct *p,
|
|
bool threadgroup)
|
|
{
|
|
}
|
|
static void mem_cgroup_move_task(struct cgroup_subsys *ss,
|
|
struct cgroup *cont,
|
|
struct cgroup *old_cont,
|
|
struct task_struct *p,
|
|
bool threadgroup)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* is_target_pte_for_mc - check a pte whether it is valid for move charge
|
|
* @vma: the vma the pte to be checked belongs
|
|
* @addr: the address corresponding to the pte to be checked
|
|
* @ptent: the pte to be checked
|
|
* @target: the pointer the target page or swap ent will be stored(can be NULL)
|
|
*
|
|
* Returns
|
|
* 0(MC_TARGET_NONE): if the pte is not a target for move charge.
|
|
* 1(MC_TARGET_PAGE): if the page corresponding to this pte is a target for
|
|
* move charge. if @target is not NULL, the page is stored in target->page
|
|
* with extra refcnt got(Callers should handle it).
|
|
* 2(MC_TARGET_SWAP): if the swap entry corresponding to this pte is a
|
|
* target for charge migration. if @target is not NULL, the entry is stored
|
|
* in target->ent.
|
|
*
|
|
* Called with pte lock held.
|
|
*/
|
|
union mc_target {
|
|
struct page *page;
|
|
swp_entry_t ent;
|
|
};
|
|
|
|
enum mc_target_type {
|
|
MC_TARGET_NONE, /* not used */
|
|
MC_TARGET_PAGE,
|
|
MC_TARGET_SWAP,
|
|
};
|
|
|
|
static int is_target_pte_for_mc(struct vm_area_struct *vma,
|
|
unsigned long addr, pte_t ptent, union mc_target *target)
|
|
{
|
|
struct page *page = NULL;
|
|
struct page_cgroup *pc;
|
|
int ret = 0;
|
|
swp_entry_t ent = { .val = 0 };
|
|
int usage_count = 0;
|
|
bool move_anon = test_bit(MOVE_CHARGE_TYPE_ANON,
|
|
&mc.to->move_charge_at_immigrate);
|
|
|
|
if (!pte_present(ptent)) {
|
|
/* TODO: handle swap of shmes/tmpfs */
|
|
if (pte_none(ptent) || pte_file(ptent))
|
|
return 0;
|
|
else if (is_swap_pte(ptent)) {
|
|
ent = pte_to_swp_entry(ptent);
|
|
if (!move_anon || non_swap_entry(ent))
|
|
return 0;
|
|
usage_count = mem_cgroup_count_swap_user(ent, &page);
|
|
}
|
|
} else {
|
|
page = vm_normal_page(vma, addr, ptent);
|
|
if (!page || !page_mapped(page))
|
|
return 0;
|
|
/*
|
|
* TODO: We don't move charges of file(including shmem/tmpfs)
|
|
* pages for now.
|
|
*/
|
|
if (!move_anon || !PageAnon(page))
|
|
return 0;
|
|
if (!get_page_unless_zero(page))
|
|
return 0;
|
|
usage_count = page_mapcount(page);
|
|
}
|
|
if (usage_count > 1) {
|
|
/*
|
|
* TODO: We don't move charges of shared(used by multiple
|
|
* processes) pages for now.
|
|
*/
|
|
if (page)
|
|
put_page(page);
|
|
return 0;
|
|
}
|
|
if (page) {
|
|
pc = lookup_page_cgroup(page);
|
|
/*
|
|
* Do only loose check w/o page_cgroup lock.
|
|
* mem_cgroup_move_account() checks the pc is valid or not under
|
|
* the lock.
|
|
*/
|
|
if (PageCgroupUsed(pc) && pc->mem_cgroup == mc.from) {
|
|
ret = MC_TARGET_PAGE;
|
|
if (target)
|
|
target->page = page;
|
|
}
|
|
if (!ret || !target)
|
|
put_page(page);
|
|
}
|
|
/* throught */
|
|
if (ent.val && do_swap_account && !ret &&
|
|
css_id(&mc.from->css) == lookup_swap_cgroup(ent)) {
|
|
ret = MC_TARGET_SWAP;
|
|
if (target)
|
|
target->ent = ent;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd,
|
|
unsigned long addr, unsigned long end,
|
|
struct mm_walk *walk)
|
|
{
|
|
struct vm_area_struct *vma = walk->private;
|
|
pte_t *pte;
|
|
spinlock_t *ptl;
|
|
|
|
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
|
|
for (; addr != end; pte++, addr += PAGE_SIZE)
|
|
if (is_target_pte_for_mc(vma, addr, *pte, NULL))
|
|
mc.precharge++; /* increment precharge temporarily */
|
|
pte_unmap_unlock(pte - 1, ptl);
|
|
cond_resched();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned long mem_cgroup_count_precharge(struct mm_struct *mm)
|
|
{
|
|
unsigned long precharge;
|
|
struct vm_area_struct *vma;
|
|
|
|
down_read(&mm->mmap_sem);
|
|
for (vma = mm->mmap; vma; vma = vma->vm_next) {
|
|
struct mm_walk mem_cgroup_count_precharge_walk = {
|
|
.pmd_entry = mem_cgroup_count_precharge_pte_range,
|
|
.mm = mm,
|
|
.private = vma,
|
|
};
|
|
if (is_vm_hugetlb_page(vma))
|
|
continue;
|
|
/* TODO: We don't move charges of shmem/tmpfs pages for now. */
|
|
if (vma->vm_flags & VM_SHARED)
|
|
continue;
|
|
walk_page_range(vma->vm_start, vma->vm_end,
|
|
&mem_cgroup_count_precharge_walk);
|
|
}
|
|
up_read(&mm->mmap_sem);
|
|
|
|
precharge = mc.precharge;
|
|
mc.precharge = 0;
|
|
|
|
return precharge;
|
|
}
|
|
|
|
static int mem_cgroup_precharge_mc(struct mm_struct *mm)
|
|
{
|
|
return mem_cgroup_do_precharge(mem_cgroup_count_precharge(mm));
|
|
}
|
|
|
|
static void mem_cgroup_clear_mc(void)
|
|
{
|
|
/* we must uncharge all the leftover precharges from mc.to */
|
|
if (mc.precharge) {
|
|
__mem_cgroup_cancel_charge(mc.to, mc.precharge);
|
|
mc.precharge = 0;
|
|
}
|
|
/*
|
|
* we didn't uncharge from mc.from at mem_cgroup_move_account(), so
|
|
* we must uncharge here.
|
|
*/
|
|
if (mc.moved_charge) {
|
|
__mem_cgroup_cancel_charge(mc.from, mc.moved_charge);
|
|
mc.moved_charge = 0;
|
|
}
|
|
/* we must fixup refcnts and charges */
|
|
if (mc.moved_swap) {
|
|
WARN_ON_ONCE(mc.moved_swap > INT_MAX);
|
|
/* uncharge swap account from the old cgroup */
|
|
if (!mem_cgroup_is_root(mc.from))
|
|
res_counter_uncharge(&mc.from->memsw,
|
|
PAGE_SIZE * mc.moved_swap);
|
|
__mem_cgroup_put(mc.from, mc.moved_swap);
|
|
|
|
if (!mem_cgroup_is_root(mc.to)) {
|
|
/*
|
|
* we charged both to->res and to->memsw, so we should
|
|
* uncharge to->res.
|
|
*/
|
|
res_counter_uncharge(&mc.to->res,
|
|
PAGE_SIZE * mc.moved_swap);
|
|
VM_BUG_ON(test_bit(CSS_ROOT, &mc.to->css.flags));
|
|
__css_put(&mc.to->css, mc.moved_swap);
|
|
}
|
|
/* we've already done mem_cgroup_get(mc.to) */
|
|
|
|
mc.moved_swap = 0;
|
|
}
|
|
mc.from = NULL;
|
|
mc.to = NULL;
|
|
mc.moving_task = NULL;
|
|
wake_up_all(&mc.waitq);
|
|
}
|
|
|
|
static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
|
|
struct cgroup *cgroup,
|
|
struct task_struct *p,
|
|
bool threadgroup)
|
|
{
|
|
int ret = 0;
|
|
struct mem_cgroup *mem = mem_cgroup_from_cont(cgroup);
|
|
|
|
if (mem->move_charge_at_immigrate) {
|
|
struct mm_struct *mm;
|
|
struct mem_cgroup *from = mem_cgroup_from_task(p);
|
|
|
|
VM_BUG_ON(from == mem);
|
|
|
|
mm = get_task_mm(p);
|
|
if (!mm)
|
|
return 0;
|
|
/* We move charges only when we move a owner of the mm */
|
|
if (mm->owner == p) {
|
|
VM_BUG_ON(mc.from);
|
|
VM_BUG_ON(mc.to);
|
|
VM_BUG_ON(mc.precharge);
|
|
VM_BUG_ON(mc.moved_charge);
|
|
VM_BUG_ON(mc.moved_swap);
|
|
VM_BUG_ON(mc.moving_task);
|
|
mc.from = from;
|
|
mc.to = mem;
|
|
mc.precharge = 0;
|
|
mc.moved_charge = 0;
|
|
mc.moved_swap = 0;
|
|
mc.moving_task = current;
|
|
|
|
ret = mem_cgroup_precharge_mc(mm);
|
|
if (ret)
|
|
mem_cgroup_clear_mc();
|
|
}
|
|
mmput(mm);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss,
|
|
struct cgroup *cgroup,
|
|
struct task_struct *p,
|
|
bool threadgroup)
|
|
{
|
|
mem_cgroup_clear_mc();
|
|
}
|
|
|
|
static int mem_cgroup_move_charge_pte_range(pmd_t *pmd,
|
|
unsigned long addr, unsigned long end,
|
|
struct mm_walk *walk)
|
|
{
|
|
int ret = 0;
|
|
struct vm_area_struct *vma = walk->private;
|
|
pte_t *pte;
|
|
spinlock_t *ptl;
|
|
|
|
retry:
|
|
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
|
|
for (; addr != end; addr += PAGE_SIZE) {
|
|
pte_t ptent = *(pte++);
|
|
union mc_target target;
|
|
int type;
|
|
struct page *page;
|
|
struct page_cgroup *pc;
|
|
swp_entry_t ent;
|
|
|
|
if (!mc.precharge)
|
|
break;
|
|
|
|
type = is_target_pte_for_mc(vma, addr, ptent, &target);
|
|
switch (type) {
|
|
case MC_TARGET_PAGE:
|
|
page = target.page;
|
|
if (isolate_lru_page(page))
|
|
goto put;
|
|
pc = lookup_page_cgroup(page);
|
|
if (!mem_cgroup_move_account(pc,
|
|
mc.from, mc.to, false)) {
|
|
mc.precharge--;
|
|
/* we uncharge from mc.from later. */
|
|
mc.moved_charge++;
|
|
}
|
|
putback_lru_page(page);
|
|
put: /* is_target_pte_for_mc() gets the page */
|
|
put_page(page);
|
|
break;
|
|
case MC_TARGET_SWAP:
|
|
ent = target.ent;
|
|
if (!mem_cgroup_move_swap_account(ent,
|
|
mc.from, mc.to, false)) {
|
|
mc.precharge--;
|
|
/* we fixup refcnts and charges later. */
|
|
mc.moved_swap++;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
pte_unmap_unlock(pte - 1, ptl);
|
|
cond_resched();
|
|
|
|
if (addr != end) {
|
|
/*
|
|
* We have consumed all precharges we got in can_attach().
|
|
* We try charge one by one, but don't do any additional
|
|
* charges to mc.to if we have failed in charge once in attach()
|
|
* phase.
|
|
*/
|
|
ret = mem_cgroup_do_precharge(1);
|
|
if (!ret)
|
|
goto retry;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void mem_cgroup_move_charge(struct mm_struct *mm)
|
|
{
|
|
struct vm_area_struct *vma;
|
|
|
|
lru_add_drain_all();
|
|
down_read(&mm->mmap_sem);
|
|
for (vma = mm->mmap; vma; vma = vma->vm_next) {
|
|
int ret;
|
|
struct mm_walk mem_cgroup_move_charge_walk = {
|
|
.pmd_entry = mem_cgroup_move_charge_pte_range,
|
|
.mm = mm,
|
|
.private = vma,
|
|
};
|
|
if (is_vm_hugetlb_page(vma))
|
|
continue;
|
|
/* TODO: We don't move charges of shmem/tmpfs pages for now. */
|
|
if (vma->vm_flags & VM_SHARED)
|
|
continue;
|
|
ret = walk_page_range(vma->vm_start, vma->vm_end,
|
|
&mem_cgroup_move_charge_walk);
|
|
if (ret)
|
|
/*
|
|
* means we have consumed all precharges and failed in
|
|
* doing additional charge. Just abandon here.
|
|
*/
|
|
break;
|
|
}
|
|
up_read(&mm->mmap_sem);
|
|
}
|
|
|
|
static void mem_cgroup_move_task(struct cgroup_subsys *ss,
|
|
struct cgroup *cont,
|
|
struct cgroup *old_cont,
|
|
struct task_struct *p,
|
|
bool threadgroup)
|
|
{
|
|
struct mm_struct *mm;
|
|
|
|
if (!mc.to)
|
|
/* no need to move charge */
|
|
return;
|
|
|
|
mm = get_task_mm(p);
|
|
if (mm) {
|
|
mem_cgroup_move_charge(mm);
|
|
mmput(mm);
|
|
}
|
|
mem_cgroup_clear_mc();
|
|
}
|
|
|
|
struct cgroup_subsys mem_cgroup_subsys = {
|
|
.name = "memory",
|
|
.subsys_id = mem_cgroup_subsys_id,
|
|
.create = mem_cgroup_create,
|
|
.pre_destroy = mem_cgroup_pre_destroy,
|
|
.destroy = mem_cgroup_destroy,
|
|
.populate = mem_cgroup_populate,
|
|
.can_attach = mem_cgroup_can_attach,
|
|
.cancel_attach = mem_cgroup_cancel_attach,
|
|
.attach = mem_cgroup_move_task,
|
|
.early_init = 0,
|
|
.use_id = 1,
|
|
};
|
|
|
|
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
|
|
|
|
static int __init disable_swap_account(char *s)
|
|
{
|
|
really_do_swap_account = 0;
|
|
return 1;
|
|
}
|
|
__setup("noswapaccount", disable_swap_account);
|
|
#endif
|