![Vladimir Davydov](/assets/img/avatar_default.png)
It is only used in mem_cgroup_try_charge, so fold it in and zap it. Signed-off-by: Vladimir Davydov <vdavydov@parallels.com> Reviewed-by: Andres Lagar-Cavilla <andreslc@google.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Greg Thelen <gthelen@google.com> Cc: Michel Lespinasse <walken@google.com> Cc: David Rientjes <rientjes@google.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
935 lines
24 KiB
C
935 lines
24 KiB
C
/* memcontrol.h - 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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* 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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#ifndef _LINUX_MEMCONTROL_H
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#define _LINUX_MEMCONTROL_H
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#include <linux/cgroup.h>
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#include <linux/vm_event_item.h>
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#include <linux/hardirq.h>
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#include <linux/jump_label.h>
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#include <linux/page_counter.h>
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#include <linux/vmpressure.h>
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#include <linux/eventfd.h>
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#include <linux/mmzone.h>
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#include <linux/writeback.h>
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struct mem_cgroup;
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struct page;
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struct mm_struct;
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struct kmem_cache;
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/*
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* The corresponding mem_cgroup_stat_names is defined in mm/memcontrol.c,
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* These two lists should keep in accord with each other.
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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_RSS_HUGE, /* # of pages charged as anon huge */
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MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */
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MEM_CGROUP_STAT_DIRTY, /* # of dirty pages in page cache */
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MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */
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MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */
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MEM_CGROUP_STAT_NSTATS,
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};
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struct mem_cgroup_reclaim_cookie {
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struct zone *zone;
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int priority;
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unsigned int generation;
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};
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enum mem_cgroup_events_index {
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MEM_CGROUP_EVENTS_PGPGIN, /* # of pages paged in */
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MEM_CGROUP_EVENTS_PGPGOUT, /* # of pages paged out */
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MEM_CGROUP_EVENTS_PGFAULT, /* # of page-faults */
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MEM_CGROUP_EVENTS_PGMAJFAULT, /* # of major page-faults */
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MEM_CGROUP_EVENTS_NSTATS,
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/* default hierarchy events */
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MEMCG_LOW = MEM_CGROUP_EVENTS_NSTATS,
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MEMCG_HIGH,
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MEMCG_MAX,
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MEMCG_OOM,
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MEMCG_NR_EVENTS,
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};
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/*
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* Per memcg event counter is incremented at every pagein/pageout. With THP,
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* it will be incremated by the number of pages. This counter is used for
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* 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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enum mem_cgroup_events_target {
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MEM_CGROUP_TARGET_THRESH,
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MEM_CGROUP_TARGET_SOFTLIMIT,
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MEM_CGROUP_TARGET_NUMAINFO,
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MEM_CGROUP_NTARGETS,
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};
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/*
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* Bits in struct cg_proto.flags
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*/
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enum cg_proto_flags {
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/* Currently active and new sockets should be assigned to cgroups */
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MEMCG_SOCK_ACTIVE,
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/* It was ever activated; we must disarm static keys on destruction */
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MEMCG_SOCK_ACTIVATED,
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};
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struct cg_proto {
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struct page_counter memory_allocated; /* Current allocated memory. */
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struct percpu_counter sockets_allocated; /* Current number of sockets. */
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int memory_pressure;
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long sysctl_mem[3];
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unsigned long flags;
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/*
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* memcg field is used to find which memcg we belong directly
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* Each memcg struct can hold more than one cg_proto, so container_of
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* won't really cut.
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*
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* The elegant solution would be having an inverse function to
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* proto_cgroup in struct proto, but that means polluting the structure
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* for everybody, instead of just for memcg users.
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*/
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struct mem_cgroup *memcg;
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};
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#ifdef CONFIG_MEMCG
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struct mem_cgroup_stat_cpu {
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long count[MEM_CGROUP_STAT_NSTATS];
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unsigned long events[MEMCG_NR_EVENTS];
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unsigned long nr_page_events;
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unsigned long targets[MEM_CGROUP_NTARGETS];
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};
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struct mem_cgroup_reclaim_iter {
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struct mem_cgroup *position;
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/* scan generation, increased every round-trip */
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unsigned int generation;
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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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struct lruvec lruvec;
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unsigned long lru_size[NR_LRU_LISTS];
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struct mem_cgroup_reclaim_iter iter[DEF_PRIORITY + 1];
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struct rb_node tree_node; /* RB tree node */
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unsigned 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 *memcg; /* Back pointer, we cannot */
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/* use container_of */
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};
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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_threshold {
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struct eventfd_ctx *eventfd;
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unsigned long threshold;
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};
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/* For threshold */
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struct mem_cgroup_threshold_ary {
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/* An array index points to threshold just below or equal to usage. */
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int 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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struct mem_cgroup_thresholds {
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/* Primary thresholds array */
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struct mem_cgroup_threshold_ary *primary;
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/*
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* Spare threshold array.
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* This is needed to make mem_cgroup_unregister_event() "never fail".
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* It must be able to store at least primary->size - 1 entries.
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*/
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struct mem_cgroup_threshold_ary *spare;
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};
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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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struct mem_cgroup {
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struct cgroup_subsys_state css;
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/* Accounted resources */
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struct page_counter memory;
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struct page_counter memsw;
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struct page_counter kmem;
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/* Normal memory consumption range */
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unsigned long low;
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unsigned long high;
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unsigned long soft_limit;
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/* vmpressure notifications */
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struct vmpressure vmpressure;
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/* css_online() has been completed */
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int initialized;
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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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/* protected by memcg_oom_lock */
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bool oom_lock;
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int under_oom;
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int swappiness;
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/* OOM-Killer disable */
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int oom_kill_disable;
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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_thresholds thresholds;
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/* thresholds for mem+swap usage. RCU-protected */
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struct mem_cgroup_thresholds memsw_thresholds;
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/* For oom notifier event fd */
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struct list_head oom_notify;
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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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* set > 0 if pages under this cgroup are moving to other cgroup.
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*/
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atomic_t moving_account;
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/* taken only while moving_account > 0 */
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spinlock_t move_lock;
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struct task_struct *move_lock_task;
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unsigned long move_lock_flags;
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/*
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* percpu counter.
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*/
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struct mem_cgroup_stat_cpu __percpu *stat;
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spinlock_t pcp_counter_lock;
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#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_INET)
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struct cg_proto tcp_mem;
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#endif
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#if defined(CONFIG_MEMCG_KMEM)
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/* Index in the kmem_cache->memcg_params.memcg_caches array */
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int kmemcg_id;
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bool kmem_acct_activated;
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bool kmem_acct_active;
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#endif
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int last_scanned_node;
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#if MAX_NUMNODES > 1
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nodemask_t scan_nodes;
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atomic_t numainfo_events;
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atomic_t numainfo_updating;
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#endif
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#ifdef CONFIG_CGROUP_WRITEBACK
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struct list_head cgwb_list;
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struct wb_domain cgwb_domain;
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#endif
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/* List of events which userspace want to receive */
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struct list_head event_list;
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spinlock_t event_list_lock;
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struct mem_cgroup_per_node *nodeinfo[0];
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/* WARNING: nodeinfo must be the last member here */
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};
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extern struct cgroup_subsys_state *mem_cgroup_root_css;
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/**
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* mem_cgroup_events - count memory events against a cgroup
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* @memcg: the memory cgroup
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* @idx: the event index
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* @nr: the number of events to account for
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*/
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static inline void mem_cgroup_events(struct mem_cgroup *memcg,
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enum mem_cgroup_events_index idx,
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unsigned int nr)
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{
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this_cpu_add(memcg->stat->events[idx], nr);
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}
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bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg);
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int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
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gfp_t gfp_mask, struct mem_cgroup **memcgp);
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void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg,
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bool lrucare);
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void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg);
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void mem_cgroup_uncharge(struct page *page);
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void mem_cgroup_uncharge_list(struct list_head *page_list);
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void mem_cgroup_migrate(struct page *oldpage, struct page *newpage,
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bool lrucare);
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struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
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struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *);
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bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg);
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struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
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struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
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static inline
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struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){
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return css ? container_of(css, struct mem_cgroup, css) : NULL;
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}
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struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
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struct mem_cgroup *,
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struct mem_cgroup_reclaim_cookie *);
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void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
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static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg,
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struct mem_cgroup *root)
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{
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if (root == memcg)
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return true;
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if (!root->use_hierarchy)
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return false;
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return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup);
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}
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static inline bool mm_match_cgroup(struct mm_struct *mm,
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struct mem_cgroup *memcg)
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{
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struct mem_cgroup *task_memcg;
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bool match = false;
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rcu_read_lock();
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task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
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if (task_memcg)
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match = mem_cgroup_is_descendant(task_memcg, memcg);
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rcu_read_unlock();
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return match;
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}
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struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page);
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ino_t page_cgroup_ino(struct page *page);
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static inline bool mem_cgroup_disabled(void)
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{
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if (memory_cgrp_subsys.disabled)
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return true;
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return false;
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}
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/*
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* For memory reclaim.
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*/
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int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
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void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
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int nr_pages);
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static inline bool mem_cgroup_lruvec_online(struct lruvec *lruvec)
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{
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struct mem_cgroup_per_zone *mz;
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struct mem_cgroup *memcg;
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if (mem_cgroup_disabled())
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return true;
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mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec);
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memcg = mz->memcg;
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return !!(memcg->css.flags & CSS_ONLINE);
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}
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static inline
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unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
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{
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struct mem_cgroup_per_zone *mz;
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mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec);
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return mz->lru_size[lru];
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}
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static inline int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
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{
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unsigned long inactive_ratio;
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unsigned long inactive;
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unsigned long active;
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unsigned long gb;
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inactive = mem_cgroup_get_lru_size(lruvec, LRU_INACTIVE_ANON);
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active = mem_cgroup_get_lru_size(lruvec, LRU_ACTIVE_ANON);
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gb = (inactive + active) >> (30 - PAGE_SHIFT);
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if (gb)
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inactive_ratio = int_sqrt(10 * gb);
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else
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inactive_ratio = 1;
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return inactive * inactive_ratio < active;
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}
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void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
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struct task_struct *p);
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static inline void mem_cgroup_oom_enable(void)
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{
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WARN_ON(current->memcg_oom.may_oom);
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current->memcg_oom.may_oom = 1;
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}
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static inline void mem_cgroup_oom_disable(void)
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{
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WARN_ON(!current->memcg_oom.may_oom);
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current->memcg_oom.may_oom = 0;
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}
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static inline bool task_in_memcg_oom(struct task_struct *p)
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{
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return p->memcg_oom.memcg;
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}
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bool mem_cgroup_oom_synchronize(bool wait);
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#ifdef CONFIG_MEMCG_SWAP
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extern int do_swap_account;
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#endif
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struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page);
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void mem_cgroup_end_page_stat(struct mem_cgroup *memcg);
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/**
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* mem_cgroup_update_page_stat - update page state statistics
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* @memcg: memcg to account against
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* @idx: page state item to account
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* @val: number of pages (positive or negative)
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*
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* See mem_cgroup_begin_page_stat() for locking requirements.
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*/
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static inline void mem_cgroup_update_page_stat(struct mem_cgroup *memcg,
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enum mem_cgroup_stat_index idx, int val)
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{
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VM_BUG_ON(!rcu_read_lock_held());
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if (memcg)
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this_cpu_add(memcg->stat->count[idx], val);
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}
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static inline void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg,
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enum mem_cgroup_stat_index idx)
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{
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mem_cgroup_update_page_stat(memcg, idx, 1);
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}
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static inline void mem_cgroup_dec_page_stat(struct mem_cgroup *memcg,
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enum mem_cgroup_stat_index idx)
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{
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mem_cgroup_update_page_stat(memcg, idx, -1);
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}
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unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
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gfp_t gfp_mask,
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unsigned long *total_scanned);
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static inline void mem_cgroup_count_vm_event(struct mm_struct *mm,
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enum vm_event_item idx)
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{
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struct mem_cgroup *memcg;
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if (mem_cgroup_disabled())
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return;
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rcu_read_lock();
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memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
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if (unlikely(!memcg))
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goto out;
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switch (idx) {
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case PGFAULT:
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this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGFAULT]);
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break;
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case PGMAJFAULT:
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this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGMAJFAULT]);
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break;
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default:
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BUG();
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}
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out:
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rcu_read_unlock();
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}
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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void mem_cgroup_split_huge_fixup(struct page *head);
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#endif
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|
|
|
#else /* CONFIG_MEMCG */
|
|
struct mem_cgroup;
|
|
|
|
static inline void mem_cgroup_events(struct mem_cgroup *memcg,
|
|
enum mem_cgroup_events_index idx,
|
|
unsigned int nr)
|
|
{
|
|
}
|
|
|
|
static inline bool mem_cgroup_low(struct mem_cgroup *root,
|
|
struct mem_cgroup *memcg)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
|
|
gfp_t gfp_mask,
|
|
struct mem_cgroup **memcgp)
|
|
{
|
|
*memcgp = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static inline void mem_cgroup_commit_charge(struct page *page,
|
|
struct mem_cgroup *memcg,
|
|
bool lrucare)
|
|
{
|
|
}
|
|
|
|
static inline void mem_cgroup_cancel_charge(struct page *page,
|
|
struct mem_cgroup *memcg)
|
|
{
|
|
}
|
|
|
|
static inline void mem_cgroup_uncharge(struct page *page)
|
|
{
|
|
}
|
|
|
|
static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
|
|
{
|
|
}
|
|
|
|
static inline void mem_cgroup_migrate(struct page *oldpage,
|
|
struct page *newpage,
|
|
bool lrucare)
|
|
{
|
|
}
|
|
|
|
static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
|
|
struct mem_cgroup *memcg)
|
|
{
|
|
return &zone->lruvec;
|
|
}
|
|
|
|
static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
|
|
struct zone *zone)
|
|
{
|
|
return &zone->lruvec;
|
|
}
|
|
|
|
static inline bool mm_match_cgroup(struct mm_struct *mm,
|
|
struct mem_cgroup *memcg)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline bool task_in_mem_cgroup(struct task_struct *task,
|
|
const struct mem_cgroup *memcg)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline struct mem_cgroup *
|
|
mem_cgroup_iter(struct mem_cgroup *root,
|
|
struct mem_cgroup *prev,
|
|
struct mem_cgroup_reclaim_cookie *reclaim)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
|
|
struct mem_cgroup *prev)
|
|
{
|
|
}
|
|
|
|
static inline bool mem_cgroup_disabled(void)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline int
|
|
mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline bool mem_cgroup_lruvec_online(struct lruvec *lruvec)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline unsigned long
|
|
mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
|
|
int increment)
|
|
{
|
|
}
|
|
|
|
static inline void
|
|
mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
|
|
{
|
|
}
|
|
|
|
static inline struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void mem_cgroup_end_page_stat(struct mem_cgroup *memcg)
|
|
{
|
|
}
|
|
|
|
static inline void mem_cgroup_oom_enable(void)
|
|
{
|
|
}
|
|
|
|
static inline void mem_cgroup_oom_disable(void)
|
|
{
|
|
}
|
|
|
|
static inline bool task_in_memcg_oom(struct task_struct *p)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool mem_cgroup_oom_synchronize(bool wait)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg,
|
|
enum mem_cgroup_stat_index idx)
|
|
{
|
|
}
|
|
|
|
static inline void mem_cgroup_dec_page_stat(struct mem_cgroup *memcg,
|
|
enum mem_cgroup_stat_index idx)
|
|
{
|
|
}
|
|
|
|
static inline
|
|
unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
|
|
gfp_t gfp_mask,
|
|
unsigned long *total_scanned)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void mem_cgroup_split_huge_fixup(struct page *head)
|
|
{
|
|
}
|
|
|
|
static inline
|
|
void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
|
|
{
|
|
}
|
|
#endif /* CONFIG_MEMCG */
|
|
|
|
enum {
|
|
UNDER_LIMIT,
|
|
SOFT_LIMIT,
|
|
OVER_LIMIT,
|
|
};
|
|
|
|
#ifdef CONFIG_CGROUP_WRITEBACK
|
|
|
|
struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg);
|
|
struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb);
|
|
void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pavail,
|
|
unsigned long *pdirty, unsigned long *pwriteback);
|
|
|
|
#else /* CONFIG_CGROUP_WRITEBACK */
|
|
|
|
static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb,
|
|
unsigned long *pavail,
|
|
unsigned long *pdirty,
|
|
unsigned long *pwriteback)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_CGROUP_WRITEBACK */
|
|
|
|
struct sock;
|
|
#if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
|
|
void sock_update_memcg(struct sock *sk);
|
|
void sock_release_memcg(struct sock *sk);
|
|
#else
|
|
static inline void sock_update_memcg(struct sock *sk)
|
|
{
|
|
}
|
|
static inline void sock_release_memcg(struct sock *sk)
|
|
{
|
|
}
|
|
#endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */
|
|
|
|
#ifdef CONFIG_MEMCG_KMEM
|
|
extern struct static_key memcg_kmem_enabled_key;
|
|
|
|
extern int memcg_nr_cache_ids;
|
|
void memcg_get_cache_ids(void);
|
|
void memcg_put_cache_ids(void);
|
|
|
|
/*
|
|
* Helper macro to loop through all memcg-specific caches. Callers must still
|
|
* check if the cache is valid (it is either valid or NULL).
|
|
* the slab_mutex must be held when looping through those caches
|
|
*/
|
|
#define for_each_memcg_cache_index(_idx) \
|
|
for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++)
|
|
|
|
static inline bool memcg_kmem_enabled(void)
|
|
{
|
|
return static_key_false(&memcg_kmem_enabled_key);
|
|
}
|
|
|
|
static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg)
|
|
{
|
|
return memcg->kmem_acct_active;
|
|
}
|
|
|
|
/*
|
|
* In general, we'll do everything in our power to not incur in any overhead
|
|
* for non-memcg users for the kmem functions. Not even a function call, if we
|
|
* can avoid it.
|
|
*
|
|
* Therefore, we'll inline all those functions so that in the best case, we'll
|
|
* see that kmemcg is off for everybody and proceed quickly. If it is on,
|
|
* we'll still do most of the flag checking inline. We check a lot of
|
|
* conditions, but because they are pretty simple, they are expected to be
|
|
* fast.
|
|
*/
|
|
bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg,
|
|
int order);
|
|
void __memcg_kmem_commit_charge(struct page *page,
|
|
struct mem_cgroup *memcg, int order);
|
|
void __memcg_kmem_uncharge_pages(struct page *page, int order);
|
|
|
|
/*
|
|
* helper for acessing a memcg's index. It will be used as an index in the
|
|
* child cache array in kmem_cache, and also to derive its name. This function
|
|
* will return -1 when this is not a kmem-limited memcg.
|
|
*/
|
|
static inline int memcg_cache_id(struct mem_cgroup *memcg)
|
|
{
|
|
return memcg ? memcg->kmemcg_id : -1;
|
|
}
|
|
|
|
struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep);
|
|
void __memcg_kmem_put_cache(struct kmem_cache *cachep);
|
|
|
|
struct mem_cgroup *__mem_cgroup_from_kmem(void *ptr);
|
|
|
|
int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp,
|
|
unsigned long nr_pages);
|
|
void memcg_uncharge_kmem(struct mem_cgroup *memcg, unsigned long nr_pages);
|
|
|
|
/**
|
|
* memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed.
|
|
* @gfp: the gfp allocation flags.
|
|
* @memcg: a pointer to the memcg this was charged against.
|
|
* @order: allocation order.
|
|
*
|
|
* returns true if the memcg where the current task belongs can hold this
|
|
* allocation.
|
|
*
|
|
* We return true automatically if this allocation is not to be accounted to
|
|
* any memcg.
|
|
*/
|
|
static inline bool
|
|
memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
|
|
{
|
|
if (!memcg_kmem_enabled())
|
|
return true;
|
|
|
|
if (gfp & __GFP_NOACCOUNT)
|
|
return true;
|
|
/*
|
|
* __GFP_NOFAIL allocations will move on even if charging is not
|
|
* possible. Therefore we don't even try, and have this allocation
|
|
* unaccounted. We could in theory charge it forcibly, but we hope
|
|
* those allocations are rare, and won't be worth the trouble.
|
|
*/
|
|
if (gfp & __GFP_NOFAIL)
|
|
return true;
|
|
if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
|
|
return true;
|
|
|
|
/* If the test is dying, just let it go. */
|
|
if (unlikely(fatal_signal_pending(current)))
|
|
return true;
|
|
|
|
return __memcg_kmem_newpage_charge(gfp, memcg, order);
|
|
}
|
|
|
|
/**
|
|
* memcg_kmem_uncharge_pages: uncharge pages from memcg
|
|
* @page: pointer to struct page being freed
|
|
* @order: allocation order.
|
|
*/
|
|
static inline void
|
|
memcg_kmem_uncharge_pages(struct page *page, int order)
|
|
{
|
|
if (memcg_kmem_enabled())
|
|
__memcg_kmem_uncharge_pages(page, order);
|
|
}
|
|
|
|
/**
|
|
* memcg_kmem_commit_charge: embeds correct memcg in a page
|
|
* @page: pointer to struct page recently allocated
|
|
* @memcg: the memcg structure we charged against
|
|
* @order: allocation order.
|
|
*
|
|
* Needs to be called after memcg_kmem_newpage_charge, regardless of success or
|
|
* failure of the allocation. if @page is NULL, this function will revert the
|
|
* charges. Otherwise, it will commit @page to @memcg.
|
|
*/
|
|
static inline void
|
|
memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
|
|
{
|
|
if (memcg_kmem_enabled() && memcg)
|
|
__memcg_kmem_commit_charge(page, memcg, order);
|
|
}
|
|
|
|
/**
|
|
* memcg_kmem_get_cache: selects the correct per-memcg cache for allocation
|
|
* @cachep: the original global kmem cache
|
|
* @gfp: allocation flags.
|
|
*
|
|
* All memory allocated from a per-memcg cache is charged to the owner memcg.
|
|
*/
|
|
static __always_inline struct kmem_cache *
|
|
memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
|
|
{
|
|
if (!memcg_kmem_enabled())
|
|
return cachep;
|
|
if (gfp & __GFP_NOACCOUNT)
|
|
return cachep;
|
|
if (gfp & __GFP_NOFAIL)
|
|
return cachep;
|
|
if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
|
|
return cachep;
|
|
if (unlikely(fatal_signal_pending(current)))
|
|
return cachep;
|
|
|
|
return __memcg_kmem_get_cache(cachep);
|
|
}
|
|
|
|
static __always_inline void memcg_kmem_put_cache(struct kmem_cache *cachep)
|
|
{
|
|
if (memcg_kmem_enabled())
|
|
__memcg_kmem_put_cache(cachep);
|
|
}
|
|
|
|
static __always_inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr)
|
|
{
|
|
if (!memcg_kmem_enabled())
|
|
return NULL;
|
|
return __mem_cgroup_from_kmem(ptr);
|
|
}
|
|
#else
|
|
#define for_each_memcg_cache_index(_idx) \
|
|
for (; NULL; )
|
|
|
|
static inline bool memcg_kmem_enabled(void)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool
|
|
memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline void memcg_kmem_uncharge_pages(struct page *page, int order)
|
|
{
|
|
}
|
|
|
|
static inline void
|
|
memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
|
|
{
|
|
}
|
|
|
|
static inline int memcg_cache_id(struct mem_cgroup *memcg)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static inline void memcg_get_cache_ids(void)
|
|
{
|
|
}
|
|
|
|
static inline void memcg_put_cache_ids(void)
|
|
{
|
|
}
|
|
|
|
static inline struct kmem_cache *
|
|
memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
|
|
{
|
|
return cachep;
|
|
}
|
|
|
|
static inline void memcg_kmem_put_cache(struct kmem_cache *cachep)
|
|
{
|
|
}
|
|
|
|
static inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif /* CONFIG_MEMCG_KMEM */
|
|
#endif /* _LINUX_MEMCONTROL_H */
|
|
|