671 lines
18 KiB
C
671 lines
18 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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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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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_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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#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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bool task_in_mem_cgroup(struct task_struct *task,
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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_css(struct cgroup_subsys_state *css);
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static inline
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bool mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *memcg)
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{
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struct mem_cgroup *task_memcg;
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bool match;
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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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match = __mem_cgroup_same_or_subtree(memcg, task_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_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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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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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_stat_index 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_stat_index 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_stat_index 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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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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if (mem_cgroup_disabled())
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return;
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__mem_cgroup_count_vm_event(mm, idx);
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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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#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 bool mm_match_cgroup(struct mm_struct *mm,
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struct mem_cgroup *memcg)
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{
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return true;
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}
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static inline bool 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 true;
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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 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_oom_enable(void)
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{
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}
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static inline void mem_cgroup_oom_disable(void)
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{
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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 false;
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}
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static inline bool mem_cgroup_oom_synchronize(bool wait)
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{
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return false;
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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_stat_index 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_stat_index 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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#if defined(CONFIG_INET) && defined(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_INET && CONFIG_MEMCG_KMEM */
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#ifdef CONFIG_MEMCG_KMEM
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extern struct static_key memcg_kmem_enabled_key;
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extern int memcg_limited_groups_array_size;
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/*
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* Helper macro to loop through all memcg-specific caches. Callers must still
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* check if the cache is valid (it is either valid or NULL).
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* the slab_mutex must be held when looping through those caches
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*/
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#define for_each_memcg_cache_index(_idx) \
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for ((_idx) = 0; (_idx) < memcg_limited_groups_array_size; (_idx)++)
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static inline bool memcg_kmem_enabled(void)
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{
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return static_key_false(&memcg_kmem_enabled_key);
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}
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/*
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* In general, we'll do everything in our power to not incur in any overhead
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* for non-memcg users for the kmem functions. Not even a function call, if we
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* can avoid it.
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*
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* Therefore, we'll inline all those functions so that in the best case, we'll
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* see that kmemcg is off for everybody and proceed quickly. If it is on,
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* we'll still do most of the flag checking inline. We check a lot of
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* conditions, but because they are pretty simple, they are expected to be
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* fast.
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*/
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bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg,
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int order);
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void __memcg_kmem_commit_charge(struct page *page,
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struct mem_cgroup *memcg, int order);
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void __memcg_kmem_uncharge_pages(struct page *page, int order);
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int memcg_cache_id(struct mem_cgroup *memcg);
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int memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s,
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struct kmem_cache *root_cache);
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void memcg_release_cache(struct kmem_cache *cachep);
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void memcg_cache_list_add(struct mem_cgroup *memcg, struct kmem_cache *cachep);
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int memcg_update_cache_size(struct kmem_cache *s, int num_groups);
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void memcg_update_array_size(int num_groups);
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struct kmem_cache *
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__memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp);
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void mem_cgroup_destroy_cache(struct kmem_cache *cachep);
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void kmem_cache_destroy_memcg_children(struct kmem_cache *s);
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/**
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* 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;
|
|
|
|
/*
|
|
* __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 with
|
|
* res_counter_charge_nofail, but we hope those allocations are rare,
|
|
* and won't be worth the trouble.
|
|
*/
|
|
if (!(gfp & __GFP_KMEMCG) || (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.
|
|
*
|
|
* there is no need to specify memcg here, since it is embedded in page_cgroup
|
|
*/
|
|
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 the memcg given by @memcg to the
|
|
* corresponding page_cgroup.
|
|
*/
|
|
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.
|
|
*
|
|
* This function assumes that the task allocating, which determines the memcg
|
|
* in the page allocator, belongs to the same cgroup throughout the whole
|
|
* process. Misacounting can happen if the task calls memcg_kmem_get_cache()
|
|
* while belonging to a cgroup, and later on changes. This is considered
|
|
* acceptable, and should only happen upon task migration.
|
|
*
|
|
* Before the cache is created by the memcg core, there is also a possible
|
|
* imbalance: the task belongs to a memcg, but the cache being allocated from
|
|
* is the global cache, since the child cache is not yet guaranteed to be
|
|
* ready. This case is also fine, since in this case the GFP_KMEMCG will not be
|
|
* passed and the page allocator will not attempt any cgroup accounting.
|
|
*/
|
|
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_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, gfp);
|
|
}
|
|
#else
|
|
#define for_each_memcg_cache_index(_idx) \
|
|
for (; NULL; )
|
|
|
|
static inline bool memcg_kmem_enabled(void)
|
|
{
|
|
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 int
|
|
memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s,
|
|
struct kmem_cache *root_cache)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void memcg_release_cache(struct kmem_cache *cachep)
|
|
{
|
|
}
|
|
|
|
static inline void memcg_cache_list_add(struct mem_cgroup *memcg,
|
|
struct kmem_cache *s)
|
|
{
|
|
}
|
|
|
|
static inline struct kmem_cache *
|
|
memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
|
|
{
|
|
return cachep;
|
|
}
|
|
|
|
static inline void kmem_cache_destroy_memcg_children(struct kmem_cache *s)
|
|
{
|
|
}
|
|
#endif /* CONFIG_MEMCG_KMEM */
|
|
#endif /* _LINUX_MEMCONTROL_H */
|
|
|