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    SubjectRe: [15/17] SLUB: Support virtual fallback via SLAB_VFALLBACK

    On Sat, 2007-09-29 at 10:47 +0200, Peter Zijlstra wrote:

    > Ah, right, that was the detail... all this lumpy reclaim is useless for
    > atomic allocations. And with SLUB using higher order pages, atomic !0
    > order allocations will be very very common.
    > One I can remember was:
    > add_to_page_cache()
    > radix_tree_insert()
    > radix_tree_node_alloc()
    > kmem_cache_alloc()
    > which is an atomic callsite.
    > Which leaves us in a situation where we can load pages, because there is
    > free memory, but can't manage to allocate memory to track them..

    Ah, I found a boot log of one of these sessions, its also full of
    order-2 OOMs.. :-/

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