linux-kernel - Re: [RFC] Support volatile range for anon vma

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Message-ID: <0000013abda6fc7d-6cfbef1e-bc7d-4f4f-bb38-221729e8c9f9-000000@email.amazonses.com>
Date:	Thu, 1 Nov 2012 20:26:09 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Minchan Kim <minchan@...nel.org>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	John Stultz <john.stultz@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Android Kernel Team <kernel-team@...roid.com>,
	Robert Love <rlove@...gle.com>, Mel Gorman <mel@....ul.ie>,
	Hugh Dickins <hughd@...gle.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Dave Chinner <david@...morbit.com>, Neil Brown <neilb@...e.de>,
	Mike Hommey <mh@...ndium.org>, Taras Glek <tglek@...illa.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [RFC] Support volatile range for anon vma

On Fri, 26 Oct 2012, Minchan Kim wrote:

> I guess it would improve system performance very well.
> But as I wrote down in description, downside of the patch is that we have to
> age anon lru although we don't have swap. But gain via the patch is bigger than
> loss via aging of anon lru when memory pressure happens. I don't see other downside
> other than it. What do you think about it?
> (I didn't implement anon lru aging in case of no-swap but it's trivial
> once we decide)


I am a bit confused like some of the others as to why this patch is
necessary since we already have DONT_NEED.
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