Re: [Slub allocator] There are chances that kmem_cache_cpu->freelistgets lost if the process happens to be rescheduled to a differenet cpu beforethe local_irq_save() completes in __slab_alloc()

From: Christoph Lameter
Date: Mon Dec 12 2011 - 13:53:50 EST

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In reply to: Eric Dumazet: "Re: [Slub allocator] There are chances thatkmem_cache_cpu->freelist gets lost if the process happens to be rescheduledto a differenet cpu before the local_irq_save() completes in __slab_alloc()"
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On Mon, 12 Dec 2011, Eric Dumazet wrote:

> Indeed, I reproduced the leak with hackbench and lot of threads.

Ran it here and did not see anything. But obviously this is an issue.
Strange that no one noticed earlier. Usage of CONFIG_PREEMPT must not be
that frequent.

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