linux-kernel - Re: [RFC] mm-controller

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Message-Id: <1182788561.6174.70.camel@lappy>
Date:	Mon, 25 Jun 2007 18:22:41 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
Cc:	balbir@...ux.vnet.ibm.com,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Containers <containers@...ts.osdl.org>,
	linux-mm <linux-mm@...ck.org>, Balbir Singh <balbir@...ibm.com>,
	Pavel Emelianov <xemul@...ru>, Paul Menage <menage@...gle.com>,
	Kirill Korotaev <dev@...ru>, devel@...nvz.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Herbert Poetzl <herbert@...hfloor.at>,
	Roy Huang <royhuang9@...il.com>,
	Aubrey Li <aubreylee@...il.com>, riel@...hat
Subject: Re: [RFC] mm-controller

On Fri, 2007-06-22 at 22:05 +0530, Vaidyanathan Srinivasan wrote:

> Merging both limits will eliminate the issue, however we would need
> individual limits for pagecache and RSS for better control.  There are
> use cases for pagecache_limit alone without RSS_limit like the case of
> database application using direct IO, backup applications and
> streaming applications that does not make good use of pagecache.

I'm aware that some people want this. However we rejected adding a
pagecache limit to the kernel proper on grounds that reclaim should do a
better job.

And now we're sneaking it in the backdoor.

If we're going to do this, get it in the kernel proper first.

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