linux-kernel - Re: [PATCH] Make swap accounting default behavior configurable

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Message-ID: <20101118082332.GB15928@tiehlicka.suse.cz>
Date:	Thu, 18 Nov 2010 09:23:32 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org, balbir@...ux.vnet.ibm.com,
	stable@...nel.org
Subject: Re: [PATCH] Make swap accounting default behavior configurable

On Wed 17-11-10 12:28:01, Daisuke Nishimura wrote:
> On Tue, 16 Nov 2010 17:12:25 -0800
> Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > On Wed, 17 Nov 2010 09:23:39 +0900 Daisuke Nishimura <nishimura@....nes.nec.co.jp> wrote:
> > 
> > > > > 
> > > > > diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> > > > > index ed45e98..14eafa5 100644
> > > > > --- a/Documentation/kernel-parameters.txt
> > > > > +++ b/Documentation/kernel-parameters.txt
> > > > > @@ -2385,6 +2385,9 @@ and is between 256 and 4096 characters. It is defined in the file
> > > > >  			improve throughput, but will also increase the
> > > > >  			amount of memory reserved for use by the client.
> > > > >  
> > > > > +	swapaccount	[KNL] Enable accounting of swap in memory resource
> > > > > +			controller. (See Documentation/cgroups/memory.txt)
> > > > 
> > > > So we have swapaccount and noswapaccount.  Ho hum, "swapaccount=[1|0]"
> > > > would have been better.
> > > > 
> > > I suggested to keep "noswapaccount" for compatibility.
> > > If you and other guys don't like having two parameters, I don't stick to
> > > the old parameter.
> > > 
> > 
> > Yes, we're stuck with the old one now.
> > 
> > But we should note that "foo=[0|1]" is superior to "foo" and "nofoo". 
> > Even if we didn't initially intend to add "nofoo".
> > 
> I see.
> 
> Michal-san, could you update your patch to use "swapaccount=[1|0]" ?

I have noticed that Andrew has already taken the last version of the
patch for -mm tree. Should I still rework it to change swapaccount to
swapaccount=0|1 resp. true|false?

> 
> Thanks,
> Daisuke Nishimura.
-- 
Michal Hocko
L3 team 
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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