From mboxrd@z Thu Jan  1 00:00:00 1970
From: Rik van Riel <riel@redhat.com>
Subject: Re: [patch 5/9] mm + fs: prepare for non-page entries in page cache
 radix trees
Date: Fri, 10 Jan 2014 14:39:57 -0500
Message-ID: <52D04C8D.60701@redhat.com>
References: <1389377443-11755-1-git-send-email-hannes@cmpxchg.org> <1389377443-11755-6-git-send-email-hannes@cmpxchg.org>
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Cc: Andi Kleen <andi@firstfloor.org>, Andrea Arcangeli <aarcange@redhat.com>,
        Bob Liu <bob.liu@oracle.com>, Christoph Hellwig <hch@infradead.org>,
        Dave Chinner <david@fromorbit.com>, Greg Thelen <gthelen@google.com>,
        Hugh Dickins <hughd@google.com>, Jan Kara <jack@suse.cz>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Luigi Semenzato <semenzato@google.com>, Mel Gorman <mgorman@suse.de>,
        Metin Doslu <metin@citusdata.com>,
        Michel Lespinasse <walken@google.com>,
        Minchan Kim <minchan.kim@gmail.com>,
        Ozgun Erdogan <ozgun@citusdata.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Roman Gushchin <klamm@yandex-team.ru>, Ryan Mallon <rmallon@gmail.com>,
        Tejun Heo <tj@kernel.org>, Vlastimil Babka <vbabka@suse.cz>,
        linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kern
To: Johannes Weiner <hannes@cmpxchg.org>,
        Andrew Morton <akpm@linux-foundation.org>
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On 01/10/2014 01:10 PM, Johannes Weiner wrote:
> 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.
> 
> The common lookup functions will filter out non-page entries and
> return NULL for page cache holes, just as before.  But provide a raw
> version of the API which returns non-page entries as well, and switch
> shmem over to use it.
> 
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>

Reviewed-by: Rik van Riel <riel@redhat.com>

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