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    SubjectRe: [Bug #14141] order 2 page allocation failures in iwlagn
    On Tue, 6 Oct 2009, Mel Gorman wrote:

    > > > And the winner is:
    > > > 2ff05b2b4eac2e63d345fc731ea151a060247f53 is first bad commit
    > > > commit 2ff05b2b4eac2e63d345fc731ea151a060247f53
    > > > Author: David Rientjes <rientjes@google.com>
    > > > Date: Tue Jun 16 15:32:56 2009 -0700
    > > >
    > > > oom: move oom_adj value from task_struct to mm_struct
    > > >
    > > > I'm confident that the bisection is good. The test case was very reliable
    > > > while zooming in on the merge from akpm.
    > > >
    > >
    > > I doubt it for two reasons: (i) this commit was reverted in 0753ba0 since
    > > 2.6.31-rc7 and is no longer in the kernel, and (ii) these are GFP_ATOMIC
    > > allocations which would be unaffected by oom killer scores.
    > >
    >
    > However, the problem was reported to start showing up in 2.6.31-rc1 so
    > while it might not be *the* patch, it might be making the type of change
    > that caused more fragmentation. This patch adjusted the size of
    > mm_struct and maybe it was enough to change the "order" required for the
    > slab. Maybe there are other slabs that have changed size as well in that
    > timeframe.
    >
    > Frans, what is the size of mm_struct before and after this patch was
    > applied? Find it with either
    >
    > grep mm_struct /proc/slabinfo
    >
    > and if the information is not available there, try
    >
    > cat /sys/kernel/slab/mm_struct/slab_size and
    > /sys/kernel/slab/mm_struct/order
    >

    If that's the case and the problem still persists in 2.6.31-rc7 as
    reported, then you'd need to compare the current slab order for both
    mm_struct and signal_struct to the previously known working kernel
    since the latter is where oom_adj was moved. (You'd still have to check
    the former to see if there were any mm_struct additions between rc1 and
    rc7 between the commit and revert, though.)


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