linux-kernel - Re: [PATCH 0/3] fix stale swap cache account leak in memcg v7

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Message-Id: <20090515095445.9492fe13.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 15 May 2009 09:54:45 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Cc:	balbir@...ux.vnet.ibm.com,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	mingo@...e.hu,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] fix stale swap cache account leak  in memcg v7

On Fri, 15 May 2009 09:38:53 +0900
Daisuke Nishimura <nishimura@....nes.nec.co.jp> wrote:

> On Fri, 15 May 2009 08:47:16 +0900, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> > On Wed, 13 May 2009 09:31:27 +0900
> > KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> > 
> > > On Tue, 12 May 2009 15:21:58 +0530
> > > Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> > > 
> > > > > The patch set includes followng
> > > > >  [1/3] add mem_cgroup_is_activated() function. which tell us memcg is _really_ used.
> > > > >  [2/3] fix swap cache handling race by avoidng readahead.
> > > > >  [3/3] fix swap cache handling race by check swapcount again.
> > > > > 
> > > > > Result is good under my test.
> > > > 
> > > > What was the result (performance data impact) of disabling swap
> > > > readahead? Otherwise, this looks the most reasonable set of patches
> > > > for this problem.
> > > > 
> > > I'll measure some and report it in the next post.
> > > 
> > I confirmed there are cases which swapin readahead works very well....
> > 
> > Nishimura-san, could you post a patch for fixing leak at writeback ? as [3/3]
> > I'd like to fix readahead case...with some large patch.
> > 
> Sure.
> I'll rebase my patch onto [1-2/3] of your new patch and post it.
> 
Ah, plz go ahead and don't wait for me. Mine is just under rough design now.

Thanks,
-Kame

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