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, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>