Re: [PATCH 0/9] Reduce compaction scanning and lock contention

[PATCH 0/9] Reduce compaction scanning and lock contention · Mel Gorman <mgorman@suse.de> · 2012-09-21
[PATCH 1/9] Revert "mm: compaction: check lock contention first before taking lock" · Mel Gorman <mgorman@suse.de> · 2012-09-21
Re: [PATCH 1/9] Revert "mm: compaction: check lock contention first before taking lock" · Rafael Aquini <hidden> · 2012-09-21
[PATCH 3/9] Revert "mm: compaction: abort compaction loop if lock is contended or run too long" · Mel Gorman <mgorman@suse.de> · 2012-09-21
Re: [PATCH 3/9] Revert "mm: compaction: abort compaction loop if lock is contended or run too long" · Rafael Aquini <hidden> · 2012-09-21
[PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible · Mel Gorman <mgorman@suse.de> · 2012-09-21
Re: [PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible · Rafael Aquini <hidden> · 2012-09-21
Re: [PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible · Minchan Kim <minchan@kernel.org> · 2012-09-25
Re: [PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible · Mel Gorman <mgorman@suse.de> · 2012-09-25
Re: [PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible · Minchan Kim <minchan@kernel.org> · 2012-09-25
Re: [PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible · Andrew Morton <akpm@linux-foundation.org> · 2012-09-25
Re: [PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible · Minchan Kim <minchan@kernel.org> · 2012-09-26
Re: [PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible · Mel Gorman <mgorman@suse.de> · 2012-09-26
[PATCH 4/9] mm: compaction: Abort compaction loop if lock is contended or run too long · Mel Gorman <mgorman@suse.de> · 2012-09-21
Re: [PATCH 4/9] mm: compaction: Abort compaction loop if lock is contended or run too long · Rafael Aquini <hidden> · 2012-09-21
Re: [PATCH 4/9] mm: compaction: Abort compaction loop if lock is contended or run too long · Andrew Morton <akpm@linux-foundation.org> · 2012-09-21
Re: [PATCH 4/9] mm: compaction: Abort compaction loop if lock is contended or run too long · Minchan Kim <minchan@kernel.org> · 2012-09-25
[PATCH 7/9] Revert "mm: have order > 0 compaction start off where it left" · Mel Gorman <mgorman@suse.de> · 2012-09-21
Re: [PATCH 7/9] Revert "mm: have order > 0 compaction start off where it left" · Rafael Aquini <hidden> · 2012-09-21
Re: [PATCH 7/9] Revert "mm: have order > 0 compaction start off where it left" · Minchan Kim <minchan@kernel.org> · 2012-09-25
[PATCH 6/9] mm: compaction: Acquire the zone->lock as late as possible · Mel Gorman <mgorman@suse.de> · 2012-09-21
Re: [PATCH 6/9] mm: compaction: Acquire the zone->lock as late as possible · Rafael Aquini <hidden> · 2012-09-21
Re: [PATCH 6/9] mm: compaction: Acquire the zone->lock as late as possible · Andrew Morton <akpm@linux-foundation.org> · 2012-09-21
Re: [PATCH 6/9] mm: compaction: Acquire the zone->lock as late as possible · Mel Gorman <mgorman@suse.de> · 2012-09-24
Re: [PATCH 6/9] mm: compaction: Acquire the zone->lock as late as possible · Minchan Kim <minchan@kernel.org> · 2012-09-25
Re: [PATCH 6/9] mm: compaction: Acquire the zone->lock as late as possible · Minchan Kim <minchan@kernel.org> · 2012-09-25
[PATCH 9/9] mm: compaction: Restart compaction from near where it left off · Mel Gorman <mgorman@suse.de> · 2012-09-21
Re: [PATCH 9/9] mm: compaction: Restart compaction from near where it left off · Rafael Aquini <hidden> · 2012-09-21
[PATCH 8/9] mm: compaction: Cache if a pageblock was scanned and no pages were isolated · Mel Gorman <mgorman@suse.de> · 2012-09-21
Re: [PATCH 8/9] mm: compaction: Cache if a pageblock was scanned and no pages were isolated · Rafael Aquini <hidden> · 2012-09-21
Re: [PATCH 8/9] mm: compaction: Cache if a pageblock was scanned and no pages were isolated · Andrew Morton <akpm@linux-foundation.org> · 2012-09-21
Re: [PATCH 8/9] mm: compaction: Cache if a pageblock was scanned and no pages were isolated · Mel Gorman <mgorman@suse.de> · 2012-09-24
Re: [PATCH 8/9] mm: compaction: Cache if a pageblock was scanned and no pages were isolated · Andrew Morton <akpm@linux-foundation.org> · 2012-09-24
Re: [PATCH 8/9] mm: compaction: Cache if a pageblock was scanned and no pages were isolated · Mel Gorman <mgorman@suse.de> · 2012-09-25
Re: [PATCH 8/9] mm: compaction: Cache if a pageblock was scanned and no pages were isolated · Andrew Morton <akpm@linux-foundation.org> · 2012-09-25
[PATCH] mm: compaction: cache if a pageblock was scanned and no pages were isolated -fix2 · Mel Gorman <mgorman@suse.de> · 2012-09-27
Re: [PATCH 8/9] mm: compaction: Cache if a pageblock was scanned and no pages were isolated · Mel Gorman <mgorman@suse.de> · 2012-09-27
Re: [PATCH 8/9] mm: compaction: Cache if a pageblock was scanned and no pages were isolated · Minchan Kim <minchan@kernel.org> · 2012-09-26
Re: [PATCH 8/9] mm: compaction: Cache if a pageblock was scanned and no pages were isolated · Mel Gorman <mgorman@suse.de> · 2012-09-27
[PATCH 2/9] Revert "mm-compaction-abort-compaction-loop-if-lock-is-contended-or-run-too-long-fix" · Mel Gorman <mgorman@suse.de> · 2012-09-21
Re: [PATCH 2/9] Revert "mm-compaction-abort-compaction-loop-if-lock-is-contended-or-run-too-long-fix" · Rafael Aquini <hidden> · 2012-09-21
Re: [PATCH 0/9] Reduce compaction scanning and lock contention · Rik van Riel <hidden> · 2012-09-21

From: Rik van Riel <hidden>
Date: 2012-09-21 13:51:24
Also in: kvm, lkml, qemu-devel

On 09/21/2012 06:46 AM, Mel Gorman wrote:

Hi Andrew,

Richard Davies and Shaohua Li have both reported lock contention
problems in compaction on the zone and LRU locks as well as
significant amounts of time being spent in compaction. This series
aims to reduce lock contention and scanning rates to reduce that CPU
usage. Richard reported at https://lkml.org/lkml/2012/9/21/91 that
this series made a big different to a problem he reported in August
(http://marc.info/?l=kvm&m=134511507015614&w=2).

One way or the other, this series has a large impact on the amount of
scanning compaction does when there is a storm of THP allocations.

Andrew,

Mel and I have discussed the stuff in this series quite a bit,
and I am convinced this is the way forward with compaction.

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