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    SubjectRe: [PATCH] mm: SLAB Out-of-memory diagnostics
    On Fri, 2 Mar 2012, Rafael Aquini wrote:

    > On Wed, Feb 29, 2012 at 05:26:07PM -0800, David Rientjes wrote:
    > > On Wed, 29 Feb 2012, Rafael Aquini wrote:
    > >
    > > > Following the example at mm/slub.c, add out-of-memory diagnostics to the SLAB
    > > > allocator to help on debugging OOM conditions. This patch also adds a new
    > > > sysctl, 'oom_dump_slabs_forced', that overrides the effect of __GFP_NOWARN page
    > > > allocation flag and forces the kernel to report every slab allocation failure.
    > > >
    > > > An example print out looks like this:
    > > >
    > > > <snip page allocator out-of-memory message>
    > > > SLAB: Unable to allocate memory on node 0 (gfp=0x11200)
    > > > cache: bio-0, object size: 192, order: 0
    > > > node0: slabs: 3/3, objs: 60/60, free: 0
    > > >
    > > > Signed-off-by: Rafael Aquini <aquini@redhat.com>
    > >
    > > I like it, except for the addition of the sysctl. __GFP_NOWARN is used
    > > for a reason, usually because whatever is allocating memory can gracefully
    > > handle a failure and should not be emitted to the kernel log under any
    > > circumstances.
    >
    > Ok, I'll drop the sysctl part then. Pekka?

    Yes, please.


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