Re: [PATCH 6/9] mm: compaction: Acquire the zone->lock as late aspossible

[Minchan Kim]

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 <mgorman@xxxxxxx>
> Acked-by: Rik van Riel <riel@xxxxxxxxxx>
Acked-by: Minchan Kim <minchan@xxxxxxxxxx>

-- 
Kind regards,
Minchan Kim
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