Re: [Qemu-devel] [PATCH 3/6] mm: compaction: Acquire the zone->lock as l

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Re: [Qemu-devel] [PATCH 3/6] mm: compaction: Acquire the zone->lock as l

From:	Rik van Riel
Subject:	Re: [Qemu-devel] [PATCH 3/6] mm: compaction: Acquire the zone->lock as late as possible
Date:	Thu, 20 Sep 2012 14:54:33 -0400
User-agent:	Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120717 Thunderbird/14.0

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 <address@hidden>


Acked-by: Rik van Riel <address@hidden>

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[Qemu-devel] [PATCH 0/6] Reduce compaction scanning and lock contention, Mel Gorman, 2012/09/20
- [Qemu-devel] [PATCH 3/6] mm: compaction: Acquire the zone->lock as late as possible, Mel Gorman, 2012/09/20
  - Re: [Qemu-devel] [PATCH 3/6] mm: compaction: Acquire the zone->lock as late as possible, Rik van Riel <=
- [Qemu-devel] [PATCH 1/6] mm: compaction: Abort compaction loop if lock is contended or run too long, Mel Gorman, 2012/09/20
  - Re: [Qemu-devel] [PATCH 1/6] mm: compaction: Abort compaction loop if lock is contended or run too long, Rik van Riel, 2012/09/20
- [Qemu-devel] [PATCH 5/6] mm: compaction: Cache if a pageblock was scanned and no pages were isolated, Mel Gorman, 2012/09/20
  - Re: [Qemu-devel] [PATCH 5/6] mm: compaction: Cache if a pageblock was scanned and no pages were isolated, Rik van Riel, 2012/09/20
- [Qemu-devel] [PATCH 4/6] Revert "mm: have order > 0 compaction start off where it left", Mel Gorman, 2012/09/20
  - Re: [Qemu-devel] [PATCH 4/6] Revert "mm: have order > 0 compaction start off where it left", Rik van Riel, 2012/09/20
- [Qemu-devel] [PATCH 2/6] mm: compaction: Acquire the zone->lru_lock as late as possible, Mel Gorman, 2012/09/20
  - Re: [Qemu-devel] [PATCH 2/6] mm: compaction: Acquire the zone->lru_lock as late as possible, Rik van Riel, 2012/09/20
- [Qemu-devel] [PATCH 6/6] mm: compaction: Restart compaction from near where it left off, Mel Gorman, 2012/09/20
  - Re: [Qemu-devel] [PATCH 6/6] mm: compaction: Restart compaction from near where it left off, Rik van Riel, 2012/09/20

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