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authorBalbir Singh <balbir@linux.vnet.ibm.com>2009-06-18 03:26:34 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-19 00:03:47 +0400
commitd69b042f3d7406ddba560143b1796020df760800 (patch)
tree6b704864716240aa1282d06bb79c02ef4b77e16d /mm/page_cgroup.c
parentcd5008196f7e583f4c558531a2bca59f6c674c5b (diff)
downloadlinux-d69b042f3d7406ddba560143b1796020df760800.tar.xz
memcg: add file-based RSS accounting
Add file RSS tracking per memory cgroup We currently don't track file RSS, the RSS we report is actually anon RSS. All the file mapped pages, come in through the page cache and get accounted there. This patch adds support for accounting file RSS pages. It should 1. Help improve the metrics reported by the memory resource controller 2. Will form the basis for a future shared memory accounting heuristic that has been proposed by Kamezawa. Unfortunately, we cannot rename the existing "rss" keyword used in memory.stat to "anon_rss". We however, add "mapped_file" data and hope to educate the end user through documentation. [hugh.dickins@tiscali.co.uk: fix mem_cgroup_update_mapped_file_stat oops] Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Li Zefan <lizf@cn.fujitsu.cn> Cc: Paul Menage <menage@google.com> Cc: Dhaval Giani <dhaval@linux.vnet.ibm.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_cgroup.c')
-rw-r--r--mm/page_cgroup.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index 4f31c9b3e940..672089d5819f 100644
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -99,6 +99,8 @@ struct page_cgroup *lookup_page_cgroup(struct page *page)
unsigned long pfn = page_to_pfn(page);
struct mem_section *section = __pfn_to_section(pfn);
+ if (!section->page_cgroup)
+ return NULL;
return section->page_cgroup + pfn;
}