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memcg: avoid accounting special pages

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There are not-on-LRU pages which can be mapped and they are not worth to
be accounted.  (becasue we can't shrink them and need dirty codes to
handle specical case) We'd like to make use of usual objrmap/radix-tree's
protcol and don't want to account out-of-vm's control pages.

When special_mapping_fault() is called, page->mapping is tend to be NULL
and it's charged as Anonymous page.  insert_page() also handles some
special pages from drivers.

This patch is for avoiding to account special pages.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KAMEZAWA Hiroyuki
2008-10-18 20:28:10 -07:00
committed by Linus Torvalds
parent b7abea9630
commit 5b4e655e94
3 changed files with 29 additions and 24 deletions
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4
mm/rmap.c
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@ -727,8 +727,8 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma)
page_clear_dirty(page);
set_page_dirty(page);
}
mem_cgroup_uncharge_page(page);
if (PageAnon(page))
mem_cgroup_uncharge_page(page);
__dec_zone_page_state(page,
PageAnon(page) ? NR_ANON_PAGES : NR_FILE_MAPPED);
/*