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

[Rik van Riel]

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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