From: Peter Zijlstra <peterz@infradead.org>
To: Ted Ts'o <tytso@mit.edu>
Cc: David Rientjes <rientjes@google.com>,
Jens Axboe <jaxboe@fusionio.com>,
Andrew Morton <akpm@linux-foundation.org>,
Neil Brown <neilb@suse.de>, Alasdair G Kergon <agk@redhat.com>,
Chris Mason <chris.mason@oracle.com>,
Steven Whitehouse <swhiteho@redhat.com>, Jan Kara <jack@suse.cz>,
Frederic Weisbecker <fweisbec@gmail.com>,
"linux-raid@vger.kernel.org" <linux-raid@vger.kernel.org>,
"linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>,
"cluster-devel@redhat.com" <cluster-devel@redhat.com>,
"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
"reiserfs-devel@vger.kernel.org" <reiserfs-devel@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [patch 1/5] mm: add nofail variants of kmalloc kcalloc and kzalloc
Date: Wed, 25 Aug 2010 14:52:58 +0200 [thread overview]
Message-ID: <1282740778.2605.3652.camel@laptop> (raw)
In-Reply-To: <1282740516.2605.3644.camel@laptop>
On Wed, 2010-08-25 at 14:48 +0200, Peter Zijlstra wrote:
> > > On Wed, 2010-08-25 at 07:24 -0400, Ted Ts'o wrote:
> > > > (a) retry the loop in the jbd layer (which Andrew really doesn't
> > > > like), (b) keep our own private cache of free memory so we don't fail
> > > > and/or loop,
> Well (b) sounds a lot saner than either of those. Simply revert to a
> state that is sub-optimal but has bounded memory use and reserve that
> memory up-front. That way you can always get out of a tight memory spot.
Also, there's a good reason for disliking (a), its a deadlock scenario,
suppose we need to write out data to get free pages, but the writing out
is blocked on requiring free pages.
There's really nothing the page allocator can do to help you there, its
a situation you have to avoid getting into.
next prev parent reply other threads:[~2010-08-25 12:52 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-24 10:50 [patch 1/5] mm: add nofail variants of kmalloc kcalloc and kzalloc David Rientjes
2010-08-24 10:50 ` [patch 4/5] btrfs: add nofail variant of set_extent_dirty David Rientjes
2010-08-24 13:30 ` Peter Zijlstra
2010-08-24 12:15 ` [patch 1/5] mm: add nofail variants of kmalloc kcalloc and kzalloc Jan Kara
2010-08-24 13:29 ` Peter Zijlstra
2010-08-24 13:33 ` Jens Axboe
2010-08-24 20:11 ` David Rientjes
2010-08-25 11:24 ` Ted Ts'o
2010-08-25 11:35 ` Peter Zijlstra
2010-08-25 11:57 ` Ted Ts'o
2010-08-25 12:48 ` Peter Zijlstra
2010-08-25 12:52 ` Peter Zijlstra [this message]
2010-08-25 13:20 ` Theodore Tso
2010-08-25 13:31 ` Peter Zijlstra
2010-08-25 20:43 ` David Rientjes
2010-08-25 20:55 ` Peter Zijlstra
2010-08-25 21:11 ` David Rientjes
2010-08-25 21:27 ` Peter Zijlstra
2010-08-25 23:11 ` David Rientjes
2010-08-26 0:19 ` Ted Ts'o
2010-08-26 0:30 ` David Rientjes
[not found] ` <alpine.DEB.2.00.1008251724360.25783@chino.kir.corp.google.com>
2010-08-26 1:48 ` Ted Ts'o
2010-08-26 3:09 ` David Rientjes
2010-08-26 6:38 ` Dave Chinner
[not found] ` <alpine.DEB.2.00.1008251951230.7034@chino.kir.corp.google.com>
2010-08-26 7:06 ` Dave Chinner
2010-08-26 8:29 ` Peter Zijlstra
2010-08-25 13:34 ` Peter Zijlstra
2010-08-25 13:24 ` Dave Chinner
2010-08-25 13:35 ` Peter Zijlstra
2010-08-25 20:53 ` Ted Ts'o
2010-08-25 20:59 ` David Rientjes
2010-08-25 21:35 ` Peter Zijlstra
2010-08-25 20:58 ` David Rientjes
2010-08-25 21:11 ` Christoph Lameter
2010-08-25 21:21 ` Peter Zijlstra
2010-08-25 21:23 ` David Rientjes
2010-08-25 21:35 ` Christoph Lameter
2010-08-25 23:05 ` David Rientjes
2010-08-26 1:30 ` Christoph Lameter
2010-08-26 3:12 ` David Rientjes
2010-08-26 14:16 ` Christoph Lameter
2010-08-26 22:31 ` David Rientjes
2010-08-26 0:09 ` Dave Chinner
2010-08-25 14:13 ` Peter Zijlstra
2010-08-24 13:55 ` Dave Chinner
2010-08-24 14:03 ` Peter Zijlstra
2010-08-24 20:12 ` David Rientjes
2010-08-24 20:08 ` David Rientjes
2010-09-02 1:02 ` [patch v2 " David Rientjes
2010-09-02 1:03 ` [patch v2 4/5] btrfs: add nofail variant of set_extent_dirty David Rientjes
2010-09-02 7:59 ` [patch v2 1/5] mm: add nofail variants of kmalloc kcalloc and kzalloc Jiri Slaby
2010-09-02 14:51 ` Jan Kara
2010-09-02 21:15 ` Neil Brown
2010-09-05 23:03 ` David Rientjes
2010-09-05 23:01 ` David Rientjes
2010-09-06 9:05 ` David Rientjes
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