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    Subject[PATCH 8/9] ForTesting - Prevent OOM killer firing for high-order allocations
    Date

    Stop going OOM for high-order allocations. During testing of high order
    allocations, we do not want the OOM killing everything in sight.

    For comparison between kernels during the high order allocatioon stress
    test, this patch is applied to both the stock -mm kernel and the kernel
    using ZONE_EASYRCLM.

    Signed-off-by: Mel Gorman <mel@csn.ul.ie>
    diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.16-rc1-mm3-108_docs/mm/page_alloc.c linux-2.6.16-rc1-mm3-902_highorderoom/mm/page_alloc.c
    --- linux-2.6.16-rc1-mm3-108_docs/mm/page_alloc.c 2006-01-26 18:10:29.000000000 +0000
    +++ linux-2.6.16-rc1-mm3-902_highorderoom/mm/page_alloc.c 2006-01-26 18:15:07.000000000 +0000
    @@ -1095,8 +1095,11 @@ rebalance:
    if (page)
    goto got_pg;

    - out_of_memory(gfp_mask, order);
    - goto restart;
    + /* Only go OOM for low-order allocations */
    + if (order <= 3) {
    + out_of_memory(gfp_mask, order);
    + goto restart;
    + }
    }

    /*
    -
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