![Johannes Weiner](/assets/img/avatar_default.png)
Compaction (and page migration in general) can currently be hindered through pages being owned by memory cgroups that are at their limits and unreclaimable. The reason is that the replacement page is being charged against the limit while the page being replaced is also still charged. But this seems unnecessary, given that only one of the two pages will still be in use after migration finishes. This patch changes the memcg migration sequence so that the replacement page is not charged. Whatever page is still in use after successful or failed migration gets to keep the charge of the page that was going to be replaced. The replacement page will still show up temporarily in the rss/cache statistics, this can be fixed in a later patch as it's less urgent. Reported-by: David Rientjes <rientjes@google.com> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Hugh Dickins <hughd@google.com> Cc: David Rientjes <rientjes@google.com> Cc: Wanpeng Li <liwp.linux@gmail.com> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
412 lines
10 KiB
C
412 lines
10 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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struct mem_cgroup;
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struct page_cgroup;
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struct page;
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struct mm_struct;
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/* Stats that can be updated by kernel. */
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enum mem_cgroup_page_stat_item {
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MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */
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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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#ifdef CONFIG_MEMCG
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/*
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* All "charge" functions with gfp_mask should use GFP_KERNEL or
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* (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
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* alloc memory but reclaims memory from all available zones. So, "where I want
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* memory from" bits of gfp_mask has no meaning. So any bits of that field is
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* available but adding a rule is better. charge functions' gfp_mask should
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* be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
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* codes.
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* (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
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*/
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extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
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gfp_t gfp_mask);
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/* for swap handling */
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extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
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struct page *page, gfp_t mask, struct mem_cgroup **memcgp);
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extern void mem_cgroup_commit_charge_swapin(struct page *page,
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struct mem_cgroup *memcg);
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extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg);
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extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
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gfp_t gfp_mask);
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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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/* For coalescing uncharge for reducing memcg' overhead*/
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extern void mem_cgroup_uncharge_start(void);
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extern void mem_cgroup_uncharge_end(void);
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extern void mem_cgroup_uncharge_page(struct page *page);
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extern void mem_cgroup_uncharge_cache_page(struct page *page);
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bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
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struct mem_cgroup *memcg);
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int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg);
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extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
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extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
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extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm);
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extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
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extern struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);
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static inline
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int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
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{
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struct mem_cgroup *memcg;
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int match;
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rcu_read_lock();
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memcg = mem_cgroup_from_task(rcu_dereference((mm)->owner));
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match = __mem_cgroup_same_or_subtree(cgroup, memcg);
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rcu_read_unlock();
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return match;
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}
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extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg);
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extern void
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mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
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struct mem_cgroup **memcgp);
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extern void mem_cgroup_end_migration(struct mem_cgroup *memcg,
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struct page *oldpage, struct page *newpage, bool migration_ok);
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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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/*
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* For memory reclaim.
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*/
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int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec);
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int mem_cgroup_inactive_file_is_low(struct lruvec *lruvec);
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int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
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unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list);
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void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int);
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extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
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struct task_struct *p);
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extern void mem_cgroup_replace_page_cache(struct page *oldpage,
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struct page *newpage);
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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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static inline bool mem_cgroup_disabled(void)
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{
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if (mem_cgroup_subsys.disabled)
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return true;
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return false;
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}
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void __mem_cgroup_begin_update_page_stat(struct page *page, bool *locked,
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unsigned long *flags);
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extern atomic_t memcg_moving;
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static inline void mem_cgroup_begin_update_page_stat(struct page *page,
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bool *locked, unsigned long *flags)
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{
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if (mem_cgroup_disabled())
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return;
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rcu_read_lock();
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*locked = false;
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if (atomic_read(&memcg_moving))
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__mem_cgroup_begin_update_page_stat(page, locked, flags);
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}
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void __mem_cgroup_end_update_page_stat(struct page *page,
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unsigned long *flags);
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static inline void mem_cgroup_end_update_page_stat(struct page *page,
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bool *locked, unsigned long *flags)
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{
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if (mem_cgroup_disabled())
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return;
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if (*locked)
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__mem_cgroup_end_update_page_stat(page, flags);
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rcu_read_unlock();
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}
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void mem_cgroup_update_page_stat(struct page *page,
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enum mem_cgroup_page_stat_item idx,
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int val);
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static inline void mem_cgroup_inc_page_stat(struct page *page,
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enum mem_cgroup_page_stat_item idx)
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{
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mem_cgroup_update_page_stat(page, idx, 1);
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}
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static inline void mem_cgroup_dec_page_stat(struct page *page,
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enum mem_cgroup_page_stat_item idx)
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{
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mem_cgroup_update_page_stat(page, 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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void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
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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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#ifdef CONFIG_DEBUG_VM
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bool mem_cgroup_bad_page_check(struct page *page);
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void mem_cgroup_print_bad_page(struct page *page);
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#endif
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#else /* CONFIG_MEMCG */
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struct mem_cgroup;
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static inline int mem_cgroup_newpage_charge(struct page *page,
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struct mm_struct *mm, gfp_t gfp_mask)
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{
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return 0;
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}
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static inline int mem_cgroup_cache_charge(struct page *page,
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struct mm_struct *mm, gfp_t gfp_mask)
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{
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return 0;
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}
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static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
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struct page *page, gfp_t gfp_mask, struct mem_cgroup **memcgp)
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{
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return 0;
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}
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static inline void mem_cgroup_commit_charge_swapin(struct page *page,
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struct mem_cgroup *memcg)
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{
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}
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static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
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{
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}
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static inline void mem_cgroup_uncharge_start(void)
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{
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}
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static inline void mem_cgroup_uncharge_end(void)
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{
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}
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static inline void mem_cgroup_uncharge_page(struct page *page)
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{
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}
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static inline void mem_cgroup_uncharge_cache_page(struct page *page)
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{
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}
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static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
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struct mem_cgroup *memcg)
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{
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return &zone->lruvec;
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}
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static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
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struct zone *zone)
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{
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return &zone->lruvec;
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}
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static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
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{
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return NULL;
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}
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static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
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{
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return NULL;
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}
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static inline int mm_match_cgroup(struct mm_struct *mm,
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struct mem_cgroup *memcg)
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{
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return 1;
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}
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static inline int task_in_mem_cgroup(struct task_struct *task,
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const struct mem_cgroup *memcg)
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{
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return 1;
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}
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static inline struct cgroup_subsys_state
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*mem_cgroup_css(struct mem_cgroup *memcg)
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{
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return NULL;
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}
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static inline void
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mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
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struct mem_cgroup **memcgp)
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{
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}
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static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg,
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struct page *oldpage, struct page *newpage, bool migration_ok)
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{
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}
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static inline struct mem_cgroup *
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mem_cgroup_iter(struct mem_cgroup *root,
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struct mem_cgroup *prev,
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struct mem_cgroup_reclaim_cookie *reclaim)
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{
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return NULL;
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}
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static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
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struct mem_cgroup *prev)
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{
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}
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static inline bool mem_cgroup_disabled(void)
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{
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return true;
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}
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static inline int
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mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
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{
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return 1;
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}
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static inline int
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mem_cgroup_inactive_file_is_low(struct lruvec *lruvec)
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{
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return 1;
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}
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static inline unsigned long
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mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
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{
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return 0;
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}
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static inline void
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mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
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int increment)
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{
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}
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static inline void
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mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
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{
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}
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static inline void mem_cgroup_begin_update_page_stat(struct page *page,
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bool *locked, unsigned long *flags)
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{
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}
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static inline void mem_cgroup_end_update_page_stat(struct page *page,
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bool *locked, unsigned long *flags)
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{
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}
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static inline void mem_cgroup_inc_page_stat(struct page *page,
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enum mem_cgroup_page_stat_item idx)
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{
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}
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static inline void mem_cgroup_dec_page_stat(struct page *page,
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enum mem_cgroup_page_stat_item idx)
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{
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}
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static inline
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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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{
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return 0;
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}
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static inline void mem_cgroup_split_huge_fixup(struct page *head)
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{
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}
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static inline
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void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
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{
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}
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static inline void mem_cgroup_replace_page_cache(struct page *oldpage,
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struct page *newpage)
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{
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}
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#endif /* CONFIG_MEMCG */
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#if !defined(CONFIG_MEMCG) || !defined(CONFIG_DEBUG_VM)
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static inline bool
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mem_cgroup_bad_page_check(struct page *page)
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{
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return false;
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}
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static inline void
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mem_cgroup_print_bad_page(struct page *page)
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{
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}
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#endif
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enum {
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UNDER_LIMIT,
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SOFT_LIMIT,
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OVER_LIMIT,
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};
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struct sock;
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#ifdef CONFIG_MEMCG_KMEM
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void sock_update_memcg(struct sock *sk);
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void sock_release_memcg(struct sock *sk);
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#else
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static inline void sock_update_memcg(struct sock *sk)
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{
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}
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static inline void sock_release_memcg(struct sock *sk)
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{
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}
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#endif /* CONFIG_MEMCG_KMEM */
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#endif /* _LINUX_MEMCONTROL_H */
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