linux-kernel - Re: [PATCH 0/4] Memory controller soft limit patches (v3)

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Message-ID: <20090305152642.GA5482@balbir.in.ibm.com>
Date:	Thu, 5 Mar 2009 20:56:42 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-mm@...ck.org, Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	Bharata B Rao <bharata@...ibm.com>,
	Paul Menage <menage@...gle.com>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/4] Memory controller soft limit patches (v3)

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2009-03-05 18:04:10]:

> On Tue, 3 Mar 2009 16:42:44 +0530
> Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> 
> > > I wrote
> > > ==
> > >  if (victim is not over soft-limit)
> > > ==
> > > ....Maybe this discussion style is bad and I should explain my approach in patch.
> > > (I can't write code today, sorry.)
> > > 
> 
> This is an example of my direction, " do it lazy" softlimit.
> 
> Maybe this is not perfect but this addresses almost all my concern.
> I hope this will be an input for you.
> I didn't divide patch into small pieces intentionally to show a big picture.
> Thanks,
> -Kame
> ==
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> An example patch. Don't trust me, this patch may have bugs.
>

Well this is not do it lazy, all memcg's are scanned tree is built everytime
kswapd invokes soft limit reclaim. With 100 cgroups and 5 nodes, we'll
end up scanning cgroups 500 times. There is no ordering of selected
victims, so the largest victim might still be running unaffected.

-- 
	Balbir
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