Re: [PATCH 0/6] Handle bio_alloc failure
From: Andrew Morton
Date: Tue Apr 14 2009 - 14:51:42 EST
On Tue, 14 Apr 2009 14:16:32 -0400
Theodore Tso <tytso@xxxxxxx> wrote:
> In include/linux/page_alloc.h,
> __GFP_NOFAIL is documented as "will never fail", but it says
> absolutely nothing about __GFP_WAIT.
In the present implementation, a __GFP_WAIT allocation for order <=3
will only fail if the caller was oom-killed.
Which raises the question "what happens when a mempool_alloc() caller
gets oom-killed?".
Seems that it will loop around in mempool_alloc() doing weak attempts
to allocate memory, not doing direct reclaim while waiting for someone
else to free something up. hm. I guess it'll recover eventually.
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