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memcg: add memcg sanity checks at allocating and freeing pages

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Add checks at allocating or freeing a page whether the page is used (iow,
charged) from the view point of memcg.

This check may be useful in debugging a problem and we did similar checks
before the commit 52d4b9ac(memcg: allocate all page_cgroup at boot).

This patch adds some overheads at allocating or freeing memory, so it's
enabled only when CONFIG_DEBUG_VM is enabled.

Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Daisuke Nishimura
2011-03-23 16:42:25 -07:00
committed by Linus Torvalds
parent af4a662144
commit f212ad7cf9
3 changed files with 69 additions and 2 deletions
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17
include/linux/memcontrol.h
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@ -151,6 +151,10 @@ u64 mem_cgroup_get_limit(struct mem_cgroup *mem);
void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail);
#endif
#ifdef CONFIG_DEBUG_VM
bool mem_cgroup_bad_page_check(struct page *page);
void mem_cgroup_print_bad_page(struct page *page);
#endif
#else /* CONFIG_CGROUP_MEM_RES_CTLR */
struct mem_cgroup;
@ -352,5 +356,18 @@ static inline void mem_cgroup_split_huge_fixup(struct page *head,
#endif /* CONFIG_CGROUP_MEM_CONT */
#if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
static inline bool
mem_cgroup_bad_page_check(struct page *page)
{
return false;
}
static inline void
mem_cgroup_print_bad_page(struct page *page)
{
}
#endif
#endif /* _LINUX_MEMCONTROL_H */