linux-kernel - Re: memcg: cat: memory.memsw.* : Operation not supported

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Date:	Mon, 21 Jan 2013 14:46:46 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Zhouping Liu <zliu@...hat.com>
Cc:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	Li Zefan <lizefan@...wei.com>, CAI Qian <caiqian@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>
Subject: Re: memcg: cat: memory.memsw.* : Operation not supported

On Mon 21-01-13 21:27:33, Zhouping Liu wrote:
> On 01/21/2013 06:56 PM, Michal Hocko wrote:
[...]
> > From 5f8141bf7d27014cfbc7b450f13f6146b5ab099d Mon Sep 17 00:00:00 2001
> >From: Michal Hocko <mhocko@...e.cz>
> >Date: Mon, 21 Jan 2013 11:33:26 +0100
> >Subject: [PATCH] memcg: Do not create memsw files if swap accounting is
> >  disabled
> >
> >Zhouping Liu has reported that memsw files are exported even though
> >swap accounting is runtime disabled if CONFIG_MEMCG_SWAP is enabled.
> >This behavior has been introduced by af36f906 (memcg: always create
> >memsw files if CONFIG_CGROUP_MEM_RES_CTLR_SWAP) and it causes any
> >attempt to open the file to return EOPNOTSUPP. Although EOPNOTSUPP
> >should say be clear that memsw operations are not supported in the given
> >configuration it is fair to say that this behavior could be quite
> >confusing.
> >
> >Let's tear memsw files out of default cgroup files and add
> >them only if the swap accounting is really enabled (either by
> >CONFIG_MEMCG_SWAP_ENABLED or swapaccount=1 boot parameter). We can
> >hook into mem_cgroup_init which is called when the memcg subsystem is
> >initialized and which happens after boot command line is processed.
> 
> Thanks for your quick patch, your patch looks good for me.
> 
> I tested it with or without CONFIG_MEMCG_SWAP_ENABLED=y,
> and also tested it with swapaccount=1 kernel parameters, all are okay.
> 
> Tested-by: Zhouping Liu <zliu@...hat.com>

Thanks for testing!

-- 
Michal Hocko
SUSE Labs
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