Date: Fri, 25 Feb 2011 21:07:23 +0100
From: Andrea Arcangeli <aarcange@redhat.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: Andrew Morton <akpm@linux-foundation.org>,
        Arthur Marsh <arthur.marsh@internode.on.net>,
        Clemens Ladisch <cladisch@googlemail.com>,
        Linux-MM <linux-mm@kvack.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/2] Reduce the amount of time compaction disables IRQs
 for V2
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On Fri, Feb 25, 2011 at 08:04:57PM +0000, Mel Gorman wrote:
> Changelog since V1
>   o Fix initialisation of isolated (Andrea)
> 
> The following two patches are aimed at reducing the amount of time IRQs are
> disabled. It was reported by some ALSA people that transparent hugepages was
> causing slowdowns on MIDI playback but I strongly suspect that compaction
> running for smaller orders was also a factor. The theory was that IRQs
> were being disabled for too long and sure enough, compaction was found to
> be disabling IRQs for a long time. The patches reduce the length of time
> IRQs are disabled when scanning for free pages and for pages to migrate.
> 
> It's late in the cycle but the IRQs disabled times are sufficiently bad
> that it would be desirable to have these merged for 2.6.38 if possible.
> 
>  mm/compaction.c |   35 ++++++++++++++++++++++++++++++-----
>  1 files changed, 30 insertions(+), 5 deletions(-)

both patches:

Acked-by: Andrea Arcangeli <aarcange@redhat.com>
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