linux-ext4 - Re: [patch 1/5] mm: add nofail variants of kmalloc kcalloc and kzalloc

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Message-ID: <1282743290.2605.3704.camel@laptop>
Date:	Wed, 25 Aug 2010 15:34:50 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Theodore Tso <tytso@....EDU>
Cc:	David Rientjes <rientjes@...gle.com>,
	Jens Axboe <jaxboe@...ionio.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Neil Brown <neilb@...e.de>, Alasdair G Kergon <agk@...hat.com>,
	Chris Mason <chris.mason@...cle.com>,
	Steven Whitehouse <swhiteho@...hat.com>,
	Jan Kara <jack@...e.cz>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
	"linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
	"cluster-devel@...hat.com" <cluster-devel@...hat.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"reiserfs-devel@...r.kernel.org" <reiserfs-devel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [patch 1/5] mm: add nofail variants of kmalloc kcalloc and
 kzalloc

On Wed, 2010-08-25 at 09:20 -0400, Theodore Tso wrote:
> Well, if all of these users start having their own private pools of
> emergency memory, I'm not sure that's such a great idea either.

That's a secondary problem, and could be reduced by something like the
memory reservation system I provided in the swap-over-nfs patches. Of
course, when all these users can actually happen concurrently there's
really nothing much you can do about it.


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