linux-kernel - Re: [PATCH 2/3] fadvise: Add _VOLATILE,_ISVOLATILE, and

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Message-ID: <1335295211.28150.221.camel@twins>
Date:	Tue, 24 Apr 2012 21:20:11 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	John Stultz <john.stultz@...aro.org>
Cc:	LKML <linux-kernel@...r.kernel.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>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Dave Chinner <david@...morbit.com>, Neil Brown <neilb@...e.de>,
	Andrea Righi <andrea@...terlinux.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH 2/3] fadvise: Add _VOLATILE,_ISVOLATILE, and
 _NONVOLATILE flags

On Tue, 2012-04-24 at 10:49 -0700, John Stultz wrote:
> +/*
> + * Purges volatile ranges when under memory pressure
> + */
> +static int volatile_shrink(struct shrinker *ignored, struct shrink_control *sc)
> +{ 

Hmm, I would have expected regular page reclaim to know about this
instead of using a shrinker interface. Is this done specifically to
avoid growing small holes in all ranges and instead dump entire ranges
thereby keeping other ranges usable?
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