linux-kernel - [bug][mmtom] memcg: MEM_CGROUP

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Message-Id: <20081219172903.7ca9b123.nishimura@mxp.nes.nec.co.jp>
Date:	Fri, 19 Dec 2008 17:29:03 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"Hugh Dickins" <hugh@...itas.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	nishimura@....nes.nec.co.jp
Subject: [bug][mmtom] memcg: MEM_CGROUP_ZSTAT underflow

Hi.

Current(I'm testing 2008-12-16-15-50 with some patches, though) memcg have
MEM_CGROUP_ZSTAT underflow problem.

How to reproduce:
- make a directory, set mem.limit.
- run some programs exceeding mem.limit.
- make another directory, and all the tasks in old directory to new one.
- New directory's "inactive_anon" in memory.stat underflows.

>From my investigation:
- This problem seems to happen only when swapping anonymous pages. It seems
  not to happen about shmem.
- After removing memcg-fix-swap-accounting-leak-v3.patch(and of course
  memcg-fix-swap-accounting-leak-doc-fix.patch), this problem doesn't happen.

Thoughts?


Thanks,
Daisuke Nishimura.
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