On Mon, Mar 23, 2015 at 12:24:00PM +0000, Mel Gorman wrote: > These are three follow-on patches based on the xfsrepair workload Dave > Chinner reported was problematic in 4.0-rc1 due to changes in page table > management -- https://lkml.org/lkml/2015/3/1/226. > > Much of the problem was reduced by commit 53da3bc2ba9e ("mm: fix up numa > read-only thread grouping logic") and commit ba68bc0115eb ("mm: thp: > Return the correct value for change_huge_pmd"). It was known that the performance > in 3.19 was still better even if is far less safe. This series aims to > restore the performance without compromising on safety. > > Dave, you already tested patch 1 on its own but it would be nice to test > patches 1+2 and 1+2+3 separately just to be certain. 3.19 4.0-rc4 +p1 +p2 +p3 mm_migrate_pages 266,750 572,839 558,632 223,706 201,429 run time 4m54s 7m50s 7m20s 5m07s 4m31s numa stats form p1+p2: numa_hit 8436537 numa_miss 0 numa_foreign 0 numa_interleave 30765 numa_local 8409240 numa_other 27297 numa_pte_updates 46109698 numa_huge_pte_updates 0 numa_hint_faults 44756389 numa_hint_faults_local 11841095 numa_pages_migrated 4868674 pgmigrate_success 4868674 pgmigrate_fail 0 numa stats form p1+p2+p3: numa_hit 6991596 numa_miss 0 numa_foreign 0 numa_interleave 10336 numa_local 6983144 numa_other 8452 numa_pte_updates 24460492 numa_huge_pte_updates 0 numa_hint_faults 23677262 numa_hint_faults_local 5952273 numa_pages_migrated 3557928 pgmigrate_success 3557928 pgmigrate_fail 0 OK, the summary with all patches applied: config 3.19 4.0-rc1 4.0-rc4 4.0-rc5+ defaults 8m08s 9m34s 9m14s 6m57s -o ag_stride=-1 4m04s 4m38s 4m11s 4m06s -o bhash=101073 6m04s 17m43s 7m35s 6m13s -o ag_stride=-1,bhash=101073 4m54s 9m58s 7m50s 4m31s So it looks like the patch set fixes the remaining regression and in 2 of the four cases actually improves performance.... Thanks, Linus and Mel, for tracking this tricky problem down! Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- 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>