linux-kernel - Re: [PATCH] memcg: update document to mention swapoff should be test.

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Message-Id: <20090119161508.f8b9d342.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 19 Jan 2009 16:15:08 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH] memcg: update document to mention swapoff should be
 test.

On Mon, 19 Jan 2009 12:42:20 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2009-01-19 15:57:48]:
> 
> > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> > 
> > Considering recently found problem:
> >  memcg-fix-refcnt-handling-at-swapoff.patch
> > 
> > It's better to mention about swapoff behavior in memcg_test document.
> > 
> > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> > ---
> >  Documentation/cgroups/memcg_test.txt |   24 ++++++++++++++++++++++--
> >  1 file changed, 22 insertions(+), 2 deletions(-)
> > 
> > Index: mmotm-2.6.29-Jan16/Documentation/cgroups/memcg_test.txt
> > ===================================================================
> > --- mmotm-2.6.29-Jan16.orig/Documentation/cgroups/memcg_test.txt
> > +++ mmotm-2.6.29-Jan16/Documentation/cgroups/memcg_test.txt
> > @@ -1,6 +1,6 @@
> >  Memory Resource Controller(Memcg)  Implementation Memo.
> > -Last Updated: 2008/12/15
> > -Base Kernel Version: based on 2.6.28-rc8-mm.
> > +Last Updated: 2009/1/19
> > +Base Kernel Version: based on 2.6.29-rc2.
> > 
> >  Because VM is getting complex (one of reasons is memcg...), memcg's behavior
> >  is complex. This is a document for memcg's internal behavior.
> > @@ -340,3 +340,23 @@ Under below explanation, we assume CONFI
> >  	# mount -t cgroup none /cgroup -t cpuset,memory,cpu,devices
> > 
> >  	and do task move, mkdir, rmdir etc...under this.
> > +
> > + 9.7 swapoff.
> > +	Besides management of swap is one of complicated parts of memcg,
> > +	call path of swap-in at swapoff is not same as usual swap-in path..
> > +	It's worth to be tested explicitly.
> > +
> > +	For example, test like following is good.
> > +	(Shell-A)
> > +	# mount -t cgroup none /cgroup -t memory
> > +	# mkdir /cgroup/test
> > +	# echo 40M > /cgroup/test/memory.limit_in_bytes
> > +	# echo 0 > /cgroup/test/tasks
> 
> 0? shouldn't this be pid? Potentially echo $$
> 

0 is handled as $$ in cgroup/tasks file.

-Kame

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