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

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Message-ID: <alpine.DEB.2.00.1008241311380.21242@chino.kir.corp.google.com>
Date:	Tue, 24 Aug 2010 13:12:51 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Dave Chinner <david@...morbit.com>
cc:	Peter Zijlstra <peterz@...radead.org>,
	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>,
	Jens Axboe <jaxboe@...ionio.com>, Jan Kara <jack@...e.cz>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-raid@...r.kernel.org, linux-btrfs@...r.kernel.org,
	cluster-devel@...hat.com, linux-ext4@...r.kernel.org,
	reiserfs-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/5] mm: add nofail variants of kmalloc kcalloc and
 kzalloc

On Tue, 24 Aug 2010, Dave Chinner wrote:

> > git grep GFP_NOFAIL isn't auditable enough?
> > 
> > might as well declare these functions depricated if you really want to
> > do this.
> 
> Also, if you are going to add tight loops, you might want to put a
> backoff in the loops like "congestion_wait(BLK_RW_ASYNC, HZ/50);" so
> that they don't spin....
> 

These loops don't actually loop at all, all users are passing 
order < PAGE_ALLOC_COSTLY_ORDER which implicitly loop forever in the page 
allocator without killing anything (they are all GFP_NOIO or GFP_NOFS, so 
the oom killer isn't involved).
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