Commits
Srikar Dronamraju committed b6a60cf36d4
sched/numa: Move task_numa_placement() closer to numa_migrate_preferred() numa_migrate_preferred() is called periodically or when task preferred node changes. Preferred node evaluations happen once per scan sequence. If the scan completion happens just after the periodic NUMA migration, then we try to migrate to the preferred node and the preferred node might change, needing another node migration. Avoid this by checking for scan sequence completion only when checking for periodic migration. Running SPECjbb2005 on a 4 node machine and comparing bops/JVM JVMS LAST_PATCH WITH_PATCH %CHANGE 16 25862.6 26158.1 1.14258 1 74357 72725 -2.19482 Running SPECjbb2005 on a 16 node machine and comparing bops/JVM JVMS LAST_PATCH WITH_PATCH %CHANGE 8 117019 113992 -2.58 1 179095 174947 -2.31 (numbers from v1 based on v4.17-rc5) Testcase Time: Min Max Avg StdDev numa01.sh Real: 449.46 770.77 615.22 101.70 numa01.sh Sys: 132.72 208.17 170.46 24.96 numa01.sh User: 39185.26 60290.89 50066.76 6807.84 numa02.sh Real: 60.85 61.79 61.28 0.37 numa02.sh Sys: 15.34 24.71 21.08 3.61 numa02.sh User: 5204.41 5249.85 5231.21 17.60 numa03.sh Real: 785.50 916.97 840.77 44.98 numa03.sh Sys: 108.08 133.60 119.43 8.82 numa03.sh User: 61422.86 70919.75 64720.87 3310.61 numa04.sh Real: 429.57 587.37 480.80 57.40 numa04.sh Sys: 240.61 321.97 290.84 33.58 numa04.sh User: 34597.65 40498.99 37079.48 2060.72 numa05.sh Real: 392.09 431.25 414.65 13.82 numa05.sh Sys: 229.41 372.48 297.54 53.14 numa05.sh User: 33390.86 34697.49 34222.43 556.42 Testcase Time: Min Max Avg StdDev %Change numa01.sh Real: 424.63 566.18 498.12 59.26 23.50% numa01.sh Sys: 160.19 256.53 208.98 37.02 -18.4% numa01.sh User: 37320.00 46225.58 42001.57 3482.45 19.20% numa02.sh Real: 60.17 62.47 60.91 0.85 0.607% numa02.sh Sys: 15.30 22.82 17.04 2.90 23.70% numa02.sh User: 5202.13 5255.51 5219.08 20.14 0.232% numa03.sh Real: 823.91 844.89 833.86 8.46 0.828% numa03.sh Sys: 130.69 148.29 140.47 6.21 -14.9% numa03.sh User: 62519.15 64262.20 63613.38 620.05 1.740% numa04.sh Real: 515.30 603.74 548.56 30.93 -12.3% numa04.sh Sys: 459.73 525.48 489.18 21.63 -40.5% numa04.sh User: 40561.96 44919.18 42047.87 1526.85 -11.8% numa05.sh Real: 396.58 454.37 421.13 19.71 -1.53% numa05.sh Sys: 208.72 422.02 348.90 73.60 -14.7% numa05.sh User: 33124.08 36109.35 34846.47 1089.74 -1.79% Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Mel Gorman <mgorman@techsingularity.net> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1529514181-9842-20-git-send-email-srikar@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>