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

    I have no done additional tests ... and can report the following

    Thursday Mel Gorman wrote:

    > 1/5 page allocator: Always wake kswapd when restarting an allocation attempt after direct reclaim failed
    > 2/5 page allocator: Do not allow interrupts to use ALLOC_HARDER
    > These patches correct problems introduced by me during the 2.6.31-rc1
    > merge window. The patches were not meant to introduce any functional
    > changes but two were missed.
    > If your problem goes away with just these two patches applied,
    > please tell me.

    1+2 do not help

    > 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
    > This is a functional change that causes kswapd to notice sooner
    > when high-order watermarks have been hit. There have been a number
    > of changes in page reclaim since 2.6.30 that might have delayed
    > when kswapd kicks in for higher orders
    > If your problem goes away with these three patches applied, please
    > tell me

    1+2+3 do not help either

    > 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
    > This patch is very heavy handed and pre-emptively kicks kswapd when
    > watermarks are hit. It should only be necessary if there has been
    > significant changes in the timing and density of page allocations
    > from an unknown source. Tobias, this patch is largely aimed at you.
    > You reported that with patches 3+4 applied that your problems went
    > away. I need to know if patch 3 on its own is enough or if both
    > are required
    > If your problem goes away with these four patches applied, please
    > tell me

    3 allone does not help
    3+4 does ...

    Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland ++41 62 775 9902 / sb: -9900

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