linux-kernel - Re: [PATCH mmotm 2/2] memcg: allow mem.limit bigger than memsw.limit iff unlimited

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Message-Id: <20090603174641.445e3012.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 3 Jun 2009 17:46:41 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Li Zefan <lizf@...fujitsu.com>, Paul Menage <menage@...gle.com>
Subject: Re: [PATCH mmotm 2/2] memcg: allow mem.limit bigger than
 memsw.limit iff unlimited

On Wed, 3 Jun 2009 14:01:02 +0900
Daisuke Nishimura <nishimura@....nes.nec.co.jp> wrote:

> On Wed, 3 Jun 2009 12:52:28 +0900, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> > On Wed, 3 Jun 2009 11:50:27 +0900
> > Daisuke Nishimura <nishimura@....nes.nec.co.jp> wrote:
> > 
> > > Now users cannot set mem.limit bigger than memsw.limit.
> > > This patch allows mem.limit bigger than memsw.limit iff mem.limit==unlimited.
> > > 
> > > By this, users can set memsw.limit without setting mem.limit.
> > > I think it's usefull if users want to limit memsw only.
> > > They must set mem.limit first and memsw.limit to the same value now for this purpose.
> > > They can save the first step by this patch.
> > > 
> > 
> > I don't like this. No benefits to users.
> > The user should know when they set memsw.limit they have to set memory.limit.
> > This just complicates things.
> > 
> Hmm, I think there is a user who cares only limitting logical memory(mem+swap),
> not physical memory, and wants kswapd to reclaim physical memory when congested. 
> At least, I'm a such user.
> 
> Do you disagree even if I add a file like "memory.allow_limit_memsw_only" ?
> 

How about removing memory.limit < memsw.limit condition completely ?

Thanks,
-Kame

> 
> Thanks,
> Daisuke Nishimura.
> 
> > If you want to do this, add an interface as
> >   memory.all.limit_in_bytes (or some better name)
> > and allow to set memory.limit and memory.memsw.limit _at once_.
> > 
> > But I'm not sure it's worth to try. Saving user's few steps by the kenerl patch ?
> > 
> > Thanks,
> > -Kame
> > 
> > 
> 

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