linux-kernel - Re: [PATCH] mm: Do not stall in synchronous compaction for THP allocations

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Message-ID: <alpine.DEB.2.00.1111101536330.2194@chino.kir.corp.google.com>
Date:	Thu, 10 Nov 2011 15:37:32 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan.kim@...il.com>,
	Jan Kara <jack@...e.cz>, Andy Isaacson <adi@...apodia.org>,
	Johannes Weiner <jweiner@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: Do not stall in synchronous compaction for THP
 allocations

On Thu, 10 Nov 2011, Andrew Morton wrote:

> > This patch once again prevents sync migration for transparent
> > hugepage allocations as it is preferable to fail a THP allocation
> > than stall.
> 
> Who said?  ;) Presumably some people would prefer to get lots of
> huge pages for their 1000-hour compute job, and waiting a bit to get
> those pages is acceptable.
> 

Indeed.  It seems like the behavior would better be controlled with 
/sys/kernel/mm/transparent_hugepage/defrag which is set aside specifically 
to control defragmentation for transparent hugepages and for that 
synchronous compaction should certainly apply.
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