linux-kernel - Re: [Slub allocator] There are chances that kmem_cache_cpu->freelist gets lost if the process happens to be rescheduled to a differenet cpu before the local_irq_save() completes in __slab

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Message-ID: <alpine.DEB.2.00.1112131025370.23111@router.home>
Date:	Tue, 13 Dec 2011 10:27:53 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	zhihua che <zhihua.che@...il.com>, linux-kernel@...r.kernel.org,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [Slub allocator] There are chances that kmem_cache_cpu->freelist
 gets lost if the process happens to be rescheduled to a differenet cpu before
 the local_irq_save() completes in __slab_alloc()

On Tue, 13 Dec 2011, Eric Dumazet wrote:

> We can be interrupted and the IRQ handler can free an object an populate
> freelist too. So the check must always be done.

True. So a small memory leak that remained undetected. Hmm.... Wonder how
one can create some diagnostics to allow detection of this in the future.

Acked-by: Christoph Lameter <cl@...ux.com>
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