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Open Source and information security mailing list archives
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Date: Fri, 21 Sep 2012 09:51:04 -0400 From: Rik van Riel <riel@...hat.com> To: Mel Gorman <mgorman@...e.de> CC: Andrew Morton <akpm@...ux-foundation.org>, Richard Davies <richard@...chsys.com>, Shaohua Li <shli@...nel.org>, Avi Kivity <avi@...hat.com>, QEMU-devel <qemu-devel@...gnu.org>, KVM <kvm@...r.kernel.org>, Linux-MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 0/9] Reduce compaction scanning and lock contention 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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