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01b1ae63c2
Now, management of "charge" under page migration is done under following
manner. (Assume migrate page contents from oldpage to newpage)
before
- "newpage" is charged before migration.
at success.
- "oldpage" is uncharged at somewhere(unmap, radix-tree-replace)
at failure
- "newpage" is uncharged.
- "oldpage" is charged if necessary (*1)
But (*1) is not reliable....because of GFP_ATOMIC.
This patch tries to change behavior as following by charge/commit/cancel ops.
before
- charge PAGE_SIZE (no target page)
success
- commit charge against "newpage".
failure
- commit charge against "oldpage".
(PCG_USED bit works effectively to avoid double-counting)
- if "oldpage" is obsolete, cancel charge of PAGE_SIZE.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
185 lines
4.9 KiB
C
185 lines
4.9 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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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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#ifdef CONFIG_CGROUP_MEM_RES_CTLR
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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(struct mm_struct *mm,
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gfp_t gfp_mask, struct mem_cgroup **ptr);
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extern void mem_cgroup_commit_charge_swapin(struct page *page,
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struct mem_cgroup *ptr);
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extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);
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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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extern void mem_cgroup_move_lists(struct page *page, enum lru_list lru);
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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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extern int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask);
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extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
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struct list_head *dst,
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unsigned long *scanned, int order,
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int mode, struct zone *z,
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struct mem_cgroup *mem_cont,
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int active, int file);
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extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
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int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
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extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
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#define mm_match_cgroup(mm, cgroup) \
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((cgroup) == mem_cgroup_from_task((mm)->owner))
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extern int
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mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr);
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extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
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struct page *oldpage, struct page *newpage);
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/*
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* For memory reclaim.
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*/
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extern int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem);
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extern long mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem);
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extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem);
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extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
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int priority);
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extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
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int priority);
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extern long mem_cgroup_calc_reclaim(struct mem_cgroup *mem, struct zone *zone,
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int priority, enum lru_list lru);
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#else /* CONFIG_CGROUP_MEM_RES_CTLR */
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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(struct mm_struct *mm,
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gfp_t gfp_mask, struct mem_cgroup **ptr)
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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 *ptr)
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{
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}
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static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
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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 int mem_cgroup_shrink_usage(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 void mem_cgroup_move_lists(struct page *page, bool active)
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{
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}
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static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
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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 *mem)
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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_prepare_migration(struct page *page, struct mem_cgroup **ptr)
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{
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return 0;
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}
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static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
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struct page *oldpage,
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struct page *newpage)
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{
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}
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static inline int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
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{
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return 0;
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}
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static inline int mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem)
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{
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return 0;
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}
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static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
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{
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return 0;
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}
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static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
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int priority)
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{
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}
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static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
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int priority)
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{
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}
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static inline long mem_cgroup_calc_reclaim(struct mem_cgroup *mem,
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struct zone *zone, int priority,
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enum lru_list lru)
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{
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return 0;
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}
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#endif /* CONFIG_CGROUP_MEM_CONT */
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#endif /* _LINUX_MEMCONTROL_H */
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