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    SubjectRe: OOM-killer invoked but why ?
    On Thu, 31 Jan 2008 13:53:05 +0100 Claude Frantz <r31dmaeu@pc0312b.rz.unibw-muenchen.de> wrote:

    > Hello !
    >
    > I'm faced to a problem where the OOM-killer is invoked but I cannot find
    > the reason why. The machine is rather powerfull, the load is very moderate,
    > the disk swap space is nearly unused. The only strange observation which
    > appears to me is the slow but progressive decreasing of kbbuffers during
    > many hours.
    >
    > Can you help me to diagnose the problem and to find a good solution ?
    >
    > ...
    >
    > Jan 28 03:50:49 toaster kernel: 177466 pages slab
    > Jan 28 03:50:49 toaster kernel: 1915 pages pagetables
    > Jan 28 03:50:49 toaster kernel: Out of memory: kill process 10859 (amavisd) score 36218 or a child
    > Jan 28 03:50:49 toaster kernel: Killed process 19146 (amavisd)

    slab. Maybe you've been bitten by the quicklist leak. If you're able to
    patch your kernel then please try this fix:

    commit 96990a4ae979df9e235d01097d6175759331e88c
    Author: Christoph Lameter <clameter@sgi.com>
    Date: Mon Jan 14 00:55:14 2008 -0800

    quicklists: Only consider memory that can be used with GFP_KERNEL

    Quicklists calculates the size of the quicklists based on the number of
    free pages. This must be the number of free pages that can be allocated
    with GFP_KERNEL. node_page_state() includes the pages in ZONE_HIGHMEM and
    ZONE_MOVABLE which may lead the quicklists to become too large causing OOM.

    Signed-off-by: Christoph Lameter <clameter@sgi.com>
    Tested-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

    diff --git a/mm/quicklist.c b/mm/quicklist.c
    index ae8189c..3f703f7 100644
    --- a/mm/quicklist.c
    +++ b/mm/quicklist.c
    @@ -26,9 +26,17 @@ DEFINE_PER_CPU(struct quicklist, quicklist)[CONFIG_NR_QUICK];
    static unsigned long max_pages(unsigned long min_pages)
    {
    unsigned long node_free_pages, max;
    + struct zone *zones = NODE_DATA(numa_node_id())->node_zones;
    +
    + node_free_pages =
    +#ifdef CONFIG_ZONE_DMA
    + zone_page_state(&zones[ZONE_DMA], NR_FREE_PAGES) +
    +#endif
    +#ifdef CONFIG_ZONE_DMA32
    + zone_page_state(&zones[ZONE_DMA32], NR_FREE_PAGES) +
    +#endif
    + zone_page_state(&zones[ZONE_NORMAL], NR_FREE_PAGES);

    - node_free_pages = node_page_state(numa_node_id(),
    - NR_FREE_PAGES);
    max = node_free_pages / FRACTION_OF_NODE_MEM;
    return max(max, min_pages);
    }

    I note that this didn't have the stable@kernel.org cc. Christoph, did we
    deliberately decide not to backport?



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