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    SubjectRe: [PATCH 0/5] Candidate fix for increased number of GFP_ATOMIC failures V2
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    Hi,

    This is the same Mel as mel@csn.ul.ie. The mail server the address is
    on has no power until Tuesday so I'm not going to be very unresponsive
    until then. Monday is also a public holiday here and apparently they
    are upgrading the power transformers near the building.

    On 10/23/09, Karol Lewandowski <karol.k.lewandowski@gmail.com> wrote:
    > On Fri, Oct 23, 2009 at 06:58:10PM +0200, Karol Lewandowski wrote:
    >> On Thu, Oct 22, 2009 at 03:22:31PM +0100, Mel Gorman wrote:
    >> > Test 3: If you are getting allocation failures, try with the following
    >> > patch
    >> >
    >> > 3/5 vmscan: Force kswapd to take notice faster when high-order
    >> > watermarks are being hit
    >
    >> No, problem doesn't go away with these patches (1+2+3). However, from
    >> my testing this particular patch makes it way, way harder to trigger
    >> allocation failures (but these are still present).
    >>
    >> This bothers me - should I test following patches with or without
    >> above patch? This patch makes bug harder to find, IMVHO it doesn't
    >> fix the real problem.
    > ..
    >
    >> Test 4: If you are still getting failures, apply the following
    >> 4/5 page allocator: Pre-emptively wake kswapd when high-order watermarks
    >> are hit
    >
    > Ok, I've tested patches 1+2+4 and bug, while very hard to trigger, is
    > still present. I'll test complete 1-4 patchset as time permits.
    >

    And also patch 5 please which is the revert. Patch 5 as pointed out is
    probably a red herring. Hwoever, it has changed the timing and made a
    difference for some testing so I'd like to know if it helps yours as
    well.

    As things stand, it looks like patches 1+2 should certainly go ahead.
    I need to give more thought on patches 3 and 4 as to why they help
    Tobias but not anyone elses testing.

    Thanks


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