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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