linux-ext4 - Re: [PATCH 0/3] Reduce impact to overall system of SLUB using high-order allocations

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Message-ID: <20110512180457.GO11579@random.random>
Date:	Thu, 12 May 2011 20:04:57 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	David Rientjes <rientjes@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Colin King <colin.king@...onical.com>,
	Raghavendra D Prabhu <raghu.prabhu13@...il.com>,
	Jan Kara <jack@...e.cz>, Chris Mason <chris.mason@...cle.com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	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: [PATCH 0/3] Reduce impact to overall system of SLUB using
 high-order allocations

Hi James!

On Wed, May 11, 2011 at 05:34:27PM -0500, James Bottomley wrote:
> Yes, but only once in all the testing.  With patches 1 and 2 the hang is

Weird patch 2 makes the large order allocation without ~__GFP_WAIT, so
even COMPACTION=y/n shouldn't matter anymore. Am I misreading
something Mel?

Removing ~__GFP_WAIT from patch 2 (and adding ~__GFP_REPEAT as a
correctness improvement) and setting COMPACTION=y also should work ok.

Removing ~__GFP_WAIT from patch 2 and setting COMPACTION=n is expected
not to work well.

But compaction should only make the difference if you remove
~__GFP_WAIT from patch 2.
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