linux-kernel - Re: [patch 4/9] mm: filemap: move radix tree hole searching here

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Message-ID: <20140113012506.GN1992@bbox>
Date:	Mon, 13 Jan 2014 10:25:06 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Bob Liu <bob.liu@...cle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Dave Chinner <david@...morbit.com>,
	Greg Thelen <gthelen@...gle.com>,
	Hugh Dickins <hughd@...gle.com>, Jan Kara <jack@...e.cz>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Luigi Semenzato <semenzato@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Metin Doslu <metin@...usdata.com>,
	Michel Lespinasse <walken@...gle.com>,
	Ozgun Erdogan <ozgun@...usdata.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Roman Gushchin <klamm@...dex-team.ru>,
	Ryan Mallon <rmallon@...il.com>, Tejun Heo <tj@...nel.org>,
	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 4/9] mm: filemap: move radix tree hole searching here

On Fri, Jan 10, 2014 at 01:10:38PM -0500, Johannes Weiner wrote:
> The radix tree hole searching code is only used for page cache, for
> example the readahead code trying to get a a picture of the area
> surrounding a fault.
> 
> It sufficed to rely on the radix tree definition of holes, which is
> "empty tree slot".  But this is about to change, though, as shadow
> page descriptors will be stored in the page cache after the actual
> pages get evicted from memory.
> 
> Move the functions over to mm/filemap.c and make them native page
> cache operations, where they can later be adapted to handle the new
> definition of "page cache hole".
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
Reviewed-by: Minchan Kim <minchan@...nel.org>

-- 
Kind regards,
Minchan Kim
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