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    SubjectRe: OOM-killer invoked but why ?
    On Tue, Feb 05, 2008 at 02:07:37AM -0800, Andrew Morton wrote:
    > 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?
    >

    According to
    http://archive.netbsd.se/?ml=linux-stable-commits&a=2008-01&m=6134301 ,
    its been added to the stable tree. I remember asking Greg to add it.

    Thanks
    --
    regards,
    Dhaval


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