linux-kernel - Re: [PATCH 3.14 102/122] mm + fs: prepare for non-page entries in page cache radix trees

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Message-ID: <20141120162122.GS2725@suse.de>
Date:	Thu, 20 Nov 2014 16:21:22 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan@...nel.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>,
	Metin Doslu <metin@...usdata.com>,
	Michel Lespinasse <walken@...gle.com>,
	Ozgun Erdogan <ozgun@...usdata.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Roman Gushchin <klamm@...dex-team.ru>,
	Ryan Mallon <rmallon@...il.com>, Tejun Heo <tj@...nel.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 3.14 102/122] mm + fs: prepare for non-page entries in
 page cache radix trees

On Thu, Nov 20, 2014 at 10:49:37AM -0500, Johannes Weiner wrote:
> On Wed, Nov 19, 2014 at 12:52:32PM -0800, Greg Kroah-Hartman wrote:
> > 3.14-stable review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: Johannes Weiner <hannes@...xchg.org>
> > 
> > commit 0cd6144aadd2afd19d1aca880153530c52957604 upstream.
> > 
> > shmem mappings already contain exceptional entries where swap slot
> > information is remembered.
> > 
> > To be able to store eviction information for regular page cache, prepare
> > every site dealing with the radix trees directly to handle entries other
> > than pages.
> 
> I don't see the rest of the thrash-detection patches in this series.
> Without anybody actually planting "entries other than pages" in the
> radix trees, why is this needed in -stable?

Patches later on in the stable series depended upon the code structure
introduced by this patch even though the thrash-detection stuff was not
backported. It could have been backported without it but then the
patches would look much different from their mainline equivalent.

-- 
Mel Gorman
SUSE Labs
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