From: Andrew Morton <akpm@linux-foundation.org>
To: Theodore Tso <tytso@mit.edu>
Cc: knikanth@suse.de, jens.axboe@oracle.com, neilb@suse.de,
linux-kernel@vger.kernel.org, chris.mason@oracle.com,
shaggy@austin.ibm.com, xfs-masters@oss.sgi.com
Subject: Re: [PATCH 0/6] Handle bio_alloc failure
Date: Tue, 14 Apr 2009 11:46:04 -0700 [thread overview]
Message-ID: <20090414114604.2d552cbb.akpm@linux-foundation.org> (raw)
In-Reply-To: <20090414181632.GI955@mit.edu>
On Tue, 14 Apr 2009 14:16:32 -0400
Theodore Tso <tytso@mit.edu> 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.
next prev parent reply other threads:[~2009-04-14 18:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-14 11:06 [PATCH 0/6] Handle bio_alloc failure Nikanth Karthikesan
2009-04-14 11:18 ` Jens Axboe
2009-04-14 11:41 ` Nikanth Karthikesan
2009-04-14 18:16 ` Theodore Tso
2009-04-14 18:20 ` Jens Axboe
2009-04-14 18:33 ` Theodore Tso
2009-04-14 18:40 ` Jens Axboe
2009-04-14 18:46 ` Andrew Morton [this message]
2009-04-15 8:46 ` Nick Piggin
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