9442ec9df4
Replace free_hot_cold_page's VM_BUG_ON(page_get_page_cgroup(page)) by a "Bad page state" and clear: most users don't have CONFIG_DEBUG_VM on, and if it were set here, it'd likely cause corruption when the page is reused. Don't use page_assign_page_cgroup to clear it: that should be private to memcontrol.c, and always called with the lock taken; and memmap_init_zone doesn't need it either - like page->mapping and other pointers throughout the kernel, Linux assumes pointers in zeroed structures are NULL pointers. Instead use page_reset_bad_cgroup, added to memcontrol.h for this only. Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: David Rientjes <rientjes@google.com> Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hirokazu Takahashi <taka@valinux.co.jp> Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Cc: Paul Menage <menage@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
184 lines
4.7 KiB
C
184 lines
4.7 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 void mm_init_cgroup(struct mm_struct *mm, struct task_struct *p);
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extern void mm_free_cgroup(struct mm_struct *mm);
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#define page_reset_bad_cgroup(page) ((page)->page_cgroup = 0)
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extern struct page_cgroup *page_get_page_cgroup(struct page *page);
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extern int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
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gfp_t gfp_mask);
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extern void mem_cgroup_uncharge(struct page_cgroup *pc);
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extern void mem_cgroup_uncharge_page(struct page *page);
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extern void mem_cgroup_move_lists(struct page *page, bool active);
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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);
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extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
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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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int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
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#define mm_match_cgroup(mm, cgroup) \
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((cgroup) == rcu_dereference((mm)->mem_cgroup))
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extern int mem_cgroup_prepare_migration(struct page *page);
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extern void mem_cgroup_end_migration(struct page *page);
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extern void mem_cgroup_page_migration(struct page *page, 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_active(struct mem_cgroup *mem,
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struct zone *zone, int priority);
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extern long mem_cgroup_calc_reclaim_inactive(struct mem_cgroup *mem,
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struct zone *zone, int priority);
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#else /* CONFIG_CGROUP_MEM_RES_CTLR */
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static inline void mm_init_cgroup(struct mm_struct *mm,
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struct task_struct *p)
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{
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}
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static inline void mm_free_cgroup(struct mm_struct *mm)
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{
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}
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static inline void page_reset_bad_cgroup(struct page *page)
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{
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}
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static inline struct page_cgroup *page_get_page_cgroup(struct page *page)
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{
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return NULL;
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}
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static inline int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
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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_uncharge(struct page_cgroup *pc)
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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_move_lists(struct page *page, bool active)
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{
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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,
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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 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 mem_cgroup_prepare_migration(struct page *page)
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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 page *page)
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{
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}
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static inline void
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mem_cgroup_page_migration(struct page *page, 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_active(struct mem_cgroup *mem,
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struct zone *zone, int priority)
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{
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return 0;
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}
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static inline long mem_cgroup_calc_reclaim_inactive(struct mem_cgroup *mem,
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struct zone *zone, int priority)
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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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