linux-kernel - Re: [PATCH 3/3] [RFC] tmpfs: Add FALLOC_FL_MARK_VOLATILE/UNMARK

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Message-ID: <4FD13C30.2030401@linux.vnet.ibm.com>
Date:	Thu, 07 Jun 2012 16:41:36 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Dmitry Adamushko <dmitry.adamushko@...il.com>
CC:	John Stultz <john.stultz@...aro.org>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	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>,
	Rik van Riel <riel@...hat.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>,
	Taras Glek <tgek@...illa.com>, Mike Hommey <mh@...ndium.org>,
	Jan Kara <jack@...e.cz>
Subject: Re: [PATCH 3/3] [RFC] tmpfs: Add FALLOC_FL_MARK_VOLATILE/UNMARK_VOLATILE
 handlers

On 06/07/2012 03:55 AM, Dmitry Adamushko wrote:
> but maybe we should also purge them before we swap out some non-tmpfs
> pages or drop some file-backed pages?

Sure...  I guess we could kick that from either direct reclaim or from
kswapd.  But, then we're basically back to the places where
shrink_slab() is called.

I think that means that we think it's preferable to integrate this more
directly in the VM instead of sticking it off in the corner of tmpfs
only, or pretending it's a slab.

Dunno...  The slab shrinker one isn't looking _so_ bad at the moment.

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