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    SubjectRe: [ 101/175] mm: vmscan: forcibly scan highmem if there are too many buffer_heads pinning highmem
    Sorry for the slow response. I was at LSF/MM and still at Collaboration
    Summit and not keeping up with mail.

    On Tue, Apr 03, 2012 at 04:01:33AM +0100, Ben Hutchings wrote:

    > On Fri, 2012-03-30 at 12:50 -0700, Greg KH wrote:
    > > 3.3-stable review patch. If anyone has any objections, please let me know.
    > >
    > > ------------------
    > >
    > > From: Mel Gorman <mel@csn.ul.ie>
    > >
    > > commit cc715d99e529d470dde2f33a6614f255adea71f3 upstream.
    > >
    > > Stuart Foster reported on bugzilla that copying large amounts of data
    > > from NTFS caused an OOM kill on 32-bit X86 with 16G of memory. Andrew
    > > Morton correctly identified that the problem was NTFS was using 512
    > > blocks meaning each page had 8 buffer_heads in low memory pinning it.
    >
    > I notice that this was not applied to 3.0.26 or 3.2.14.
    >

    True.

    > [...]
    > > Addresses https://bugzilla.kernel.org/show_bug.cgi?id=42578
    > [...]
    >
    > but this bug was reported against 3.1.9, so the fix is presumably needed
    > for 3.2 at least.
    >
    > Presumably the upstream change doesn't apply cleanly and would need to
    > be backported. Is anyone planning to do that?
    >

    It probably does not apply cleanly and considering how the bug is
    triggered I was not treating it as a high priority. Nikola Ciprich
    (added to cc) had said that he might try backporting it and I would
    review the result. I have not heard anything since. I can take a look at
    backporting it next week if it is considered a common problem.

    --
    Mel Gorman
    SUSE Labs


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