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    SubjectRe: [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@cmpxchg.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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