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Re: [Qemu-devel] [PATCH 6/9] mm: compaction: Acquire the zone->lock as l


From: Rafael Aquini
Subject: Re: [Qemu-devel] [PATCH 6/9] mm: compaction: Acquire the zone->lock as late as possible
Date: Fri, 21 Sep 2012 14:52:05 -0300
User-agent: Mutt/1.5.21 (2010-09-15)

On Fri, Sep 21, 2012 at 11:46:20AM +0100, Mel Gorman wrote:
> Compactions free scanner acquires the zone->lock when checking for PageBuddy
> pages and isolating them. It does this even if there are no PageBuddy pages
> in the range.
> 
> This patch defers acquiring the zone lock for as long as possible. In the
> event there are no free pages in the pageblock then the lock will not be
> acquired at all which reduces contention on zone->lock.
> 
> Signed-off-by: Mel Gorman <address@hidden>
> Acked-by: Rik van Riel <address@hidden>
> ---

Acked-by: Rafael Aquini <address@hidden>




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