Re: [PATCH 3/6] mm: compaction: Acquire the zone->lock as late aspossible

From: Rik van Riel
Date: Thu Sep 20 2012 - 14:57:45 EST

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On 09/20/2012 10:04 AM, 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>

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Next message: Rik van Riel: "Re: [PATCH 2/6] mm: compaction: Acquire the zone->lru_lock as lateas possible"
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