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mm: memcontrol: remove unnecessary PCG_USED pc->mem_cgroup valid flag

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pc->mem_cgroup had to be left intact after uncharge for the final LRU
removal, and !PCG_USED indicated whether the page was uncharged.  But
since commit 0a31bc97c8 ("mm: memcontrol: rewrite uncharge API") pages
are uncharged after the final LRU removal.  Uncharge can simply clear
the pointer and the PCG_USED/PageCgroupUsed sites can test that instead.

Because this is the last page_cgroup flag, this patch reduces the memcg
per-page overhead to a single pointer.

[akpm@linux-foundation.org: remove unneeded initialization of `memcg', per Michal]
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Hugh Dickins <hughd@google.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Reviewed-by: Vladimir Davydov <vdavydov@parallels.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2014-12-10 15:44:02 -08:00 • committed by Linus Torvalds
commit 2983331575
2 changed files with 41 additions and 76 deletions
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10
include/linux/page_cgroup.h
View file

@ -1,11 +1,6 @@
#ifndef __LINUX_PAGE_CGROUP_H
#define __LINUX_PAGE_CGROUP_H
enum {
/* flags for mem_cgroup */
PCG_USED = 0x01, /* This page is charged to a memcg */
};
struct pglist_data;
#ifdef CONFIG_MEMCG
@ -19,7 +14,6 @@ struct mem_cgroup;
* then the page cgroup for pfn always exists.
*/
struct page_cgroup {
unsigned long flags;
struct mem_cgroup *mem_cgroup;
};
@ -39,10 +33,6 @@ static inline void page_cgroup_init(void)
struct page_cgroup *lookup_page_cgroup(struct page *page);
static inline int PageCgroupUsed(struct page_cgroup *pc)
{
return !!(pc->flags & PCG_USED);
}
#else /* !CONFIG_MEMCG */
struct page_cgroup;