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Re: [Qemu-devel] [PATCH 0/9] Reduce compaction scanning and lock content
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From: |
Rik van Riel |
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Subject: |
Re: [Qemu-devel] [PATCH 0/9] Reduce compaction scanning and lock contention |
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Date: |
Fri, 21 Sep 2012 09:51:04 -0400 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120827 Thunderbird/15.0 |
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.
--
All rights reversed
- Re: [Qemu-devel] [PATCH 4/9] mm: compaction: Abort compaction loop if lock is contended or run too long, (continued)
- [Qemu-devel] [PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible, Mel Gorman, 2012/09/21
- Re: [Qemu-devel] [PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible, Rafael Aquini, 2012/09/21
- Re: [Qemu-devel] [PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible, Minchan Kim, 2012/09/25
- Re: [Qemu-devel] [PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible, Mel Gorman, 2012/09/25
- Re: [Qemu-devel] [PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible, Minchan Kim, 2012/09/25
- Re: [Qemu-devel] [PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible, Andrew Morton, 2012/09/25
- Re: [Qemu-devel] [PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible, Minchan Kim, 2012/09/25
- Re: [Qemu-devel] [PATCH 5/9] mm: compaction: Acquire the zone->lru_lock as late as possible, Mel Gorman, 2012/09/26
Re: [Qemu-devel] [PATCH 0/9] Reduce compaction scanning and lock contention,
Rik van Riel <=