linux-kernel - Re: [BUG] fatal hang untarring 90GB file, possibly writeback related.

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Message-ID: <1305036064.6737.8.camel@mulgrave.site>
Date:	Tue, 10 May 2011 09:01:04 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Mel Gorman <mgorman@...ell.com>
Cc:	Mel Gorman <mgorman@...e.de>, Jan Kara <jack@...e.cz>,
	colin.king@...onical.com, Chris Mason <chris.mason@...cle.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [BUG] fatal hang untarring 90GB file, possibly writeback
 related.

On Tue, 2011-05-10 at 11:21 +0100, Mel Gorman wrote:
> I really would like to hear if the fix makes a big difference or
> if we need to consider forcing SLUB high-order allocations bailing
> at the first sign of trouble (e.g. by masking out __GFP_WAIT in
> allocate_slab). Even with the fix applied, kswapd might be waking up
> less but processes will still be getting stalled in direct compaction
> and direct reclaim so it would still be jittery.

"the fix" being this

https://lkml.org/lkml/2011/3/5/121

In addition to your GFP_KSWAPD one?

OK, will retry with that.

James


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