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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>
- [Qemu-devel] [PATCH 2/9] Revert "mm-compaction-abort-compaction-loop-if-lock-is-contended-or-run-too-long-fix", (continued)
- [Qemu-devel] [PATCH 2/9] Revert "mm-compaction-abort-compaction-loop-if-lock-is-contended-or-run-too-long-fix", Mel Gorman, 2012/09/21
- [Qemu-devel] [PATCH 3/9] Revert "mm: compaction: abort compaction loop if lock is contended or run too long", Mel Gorman, 2012/09/21
- [Qemu-devel] [PATCH 1/9] Revert "mm: compaction: check lock contention first before taking lock", Mel Gorman, 2012/09/21
- [Qemu-devel] [PATCH 7/9] Revert "mm: have order > 0 compaction start off where it left", Mel Gorman, 2012/09/21
- [Qemu-devel] [PATCH 6/9] mm: compaction: Acquire the zone->lock as late as possible, Mel Gorman, 2012/09/21
- Re: [Qemu-devel] [PATCH 6/9] mm: compaction: Acquire the zone->lock as late as possible, Minchan Kim, 2012/09/25
- [Qemu-devel] [PATCH 8/9] mm: compaction: Cache if a pageblock was scanned and no pages were isolated, Mel Gorman, 2012/09/21