FYI, we noticed the below changes on https://github.com/0day-ci/linux Waiman-Long/locking-mutex-Enable-optimistic-spinning-of-lock-waiter/20160210-035352 commit 526743800284f9bf1c3487754abdd0a04689986a ("locking/mutex: Enable optimistic spinning of woken task in wait queue") ========================================================================================= compiler/cpufreq_governor/disk/filenum/fs/iomode/kconfig/nr_threads/period/rootfs/rwmode/size/tbox_group/testcase: gcc-4.9/performance/1HDD/1024f/xfs/sync/x86_64-rhel/100%/600s/debian-x86_64-2015-02-07.cgz/seqrewr/64G/lkp-sb02/fileio commit: a97b24f27907ff7078dde5d8b162890657e9cffa 526743800284f9bf1c3487754abdd0a04689986a a97b24f27907ff70 526743800284f9bf1c3487754a ---------------- -------------------------- %stddev %change %stddev \ | \ 0.02 ± 0% +82950.0% 16.61 ± 0% fileio.request_latency_95%_ms 4409 ± 1% +38.9% 6126 ± 2% fileio.time.involuntary_context_switches 6.00 ± 0% +33.3% 8.00 ± 0% fileio.time.percent_of_cpu_this_job_got 36.06 ± 0% +43.0% 51.55 ± 0% fileio.time.system_time 1828660 ± 0% -92.5% 137258 ± 0% fileio.time.voluntary_context_switches 6776 ± 3% -83.3% 1134 ± 2% vmstat.system.cs 965.80 ± 3% +1699.5% 17379 ± 0% latency_stats.avg.xfs_file_buffered_aio_write.xfs_file_write_iter.__vfs_write.vfs_write.SyS_pwrite64.entry_SYSCALL_64_fastpath 1775334 ± 0% -94.4% 98980 ± 0% latency_stats.hits.xfs_file_buffered_aio_write.xfs_file_write_iter.__vfs_write.vfs_write.SyS_pwrite64.entry_SYSCALL_64_fastpath 2854 ± 1% +28.3% 3663 ± 4% proc-vmstat.kswapd_high_wmark_hit_quickly 2686 ± 5% -31.5% 1839 ± 8% proc-vmstat.kswapd_low_wmark_hit_quickly 4409 ± 1% +38.9% 6126 ± 2% time.involuntary_context_switches 6.00 ± 0% +33.3% 8.00 ± 0% time.percent_of_cpu_this_job_got 36.06 ± 0% +43.0% 51.55 ± 0% time.system_time 1.61 ± 8% +30.9% 2.11 ± 10% time.user_time 1828660 ± 0% -92.5% 137258 ± 0% time.voluntary_context_switches 8.132e+08 ± 2% -99.6% 2980944 ± 15% cpuidle.C1-SNB.time 1017420 ± 1% -99.4% 6236 ± 7% cpuidle.C1-SNB.usage 15400570 ± 5% -29.7% 10828903 ± 9% cpuidle.C1E-SNB.time 23282 ± 4% -25.5% 17339 ± 4% cpuidle.C1E-SNB.usage 10079742 ± 6% -34.3% 6626480 ± 5% cpuidle.C3-SNB.time 11636 ± 2% -25.9% 8620 ± 6% cpuidle.C3-SNB.usage 9.165e+08 ± 12% +158.8% 2.372e+09 ± 4% cpuidle.C6-SNB.time 215963 ± 3% +11.9% 241655 ± 1% cpuidle.C6-SNB.usage 6.391e+08 ± 3% -99.7% 1916334 ± 17% cpuidle.POLL.time 737818 ± 2% -92.0% 59379 ± 8% cpuidle.POLL.usage 28.32 ± 5% -89.4% 2.99 ± 3% turbostat.%Busy 846.40 ± 5% -89.9% 85.11 ± 3% turbostat.Avg_MHz 34.14 ± 4% -97.0% 1.02 ± 3% turbostat.CPU%c1 0.48 ± 7% -29.2% 0.34 ± 4% turbostat.CPU%c3 37.05 ± 7% +158.2% 95.65 ± 0% turbostat.CPU%c6 17.13 ± 4% -85.2% 2.53 ± 2% turbostat.CorWatt 0.83 ± 40% +4818.5% 40.92 ± 3% turbostat.Pkg%pc2 0.12 ± 11% +199.4% 0.36 ± 8% turbostat.Pkg%pc3 1.96 ±181% +2442.6% 49.76 ± 2% turbostat.Pkg%pc6 20.71 ± 3% -70.8% 6.04 ± 1% turbostat.PkgWatt 9162 ± 3% +23.4% 11309 ± 3% sched_debug.cfs_rq:/.exec_clock.0 6844 ± 3% +31.9% 9030 ± 2% sched_debug.cfs_rq:/.exec_clock.1 6768 ± 4% +31.1% 8870 ± 2% sched_debug.cfs_rq:/.exec_clock.2 6805 ± 4% +30.7% 8892 ± 3% sched_debug.cfs_rq:/.exec_clock.3 7395 ± 2% +28.8% 9525 ± 2% sched_debug.cfs_rq:/.exec_clock.avg 9163 ± 3% +23.4% 11309 ± 3% sched_debug.cfs_rq:/.exec_clock.max 6562 ± 2% +33.2% 8738 ± 2% sched_debug.cfs_rq:/.exec_clock.min 28.21 ± 9% +23.6% 34.85 ± 10% sched_debug.cfs_rq:/.load_avg.avg 15905 ± 6% +17.9% 18747 ± 3% sched_debug.cfs_rq:/.min_vruntime.0 14555 ± 6% +18.1% 17190 ± 2% sched_debug.cfs_rq:/.min_vruntime.2 14783 ± 10% +23.9% 18316 ± 7% sched_debug.cfs_rq:/.min_vruntime.3 15027 ± 2% +17.8% 17708 ± 2% sched_debug.cfs_rq:/.min_vruntime.avg 16764 ± 3% +15.1% 19297 ± 4% sched_debug.cfs_rq:/.min_vruntime.max 13379 ± 3% +22.5% 16396 ± 2% sched_debug.cfs_rq:/.min_vruntime.min 82.40 ± 13% +27.6% 105.11 ± 13% sched_debug.cfs_rq:/.util_avg.3 84.55 ± 4% +12.4% 95.06 ± 4% sched_debug.cfs_rq:/.util_avg.avg 691995 ± 5% +12.5% 778781 ± 1% sched_debug.cpu.avg_idle.avg 430798 ± 20% +45.9% 628519 ± 2% sched_debug.cpu.avg_idle.min 181201 ± 16% -37.0% 114212 ± 8% sched_debug.cpu.avg_idle.stddev 533948 ± 5% -80.7% 102858 ± 6% sched_debug.cpu.nr_switches.0 534186 ± 7% -81.0% 101537 ± 9% sched_debug.cpu.nr_switches.1 544165 ± 10% -82.8% 93401 ± 8% sched_debug.cpu.nr_switches.2 563662 ± 7% -83.6% 92575 ± 10% sched_debug.cpu.nr_switches.3 543991 ± 2% -82.1% 97593 ± 3% sched_debug.cpu.nr_switches.avg 602486 ± 4% -81.7% 110318 ± 5% sched_debug.cpu.nr_switches.max 494168 ± 6% -82.5% 86298 ± 6% sched_debug.cpu.nr_switches.min 40961 ± 45% -77.8% 9113 ± 35% sched_debug.cpu.nr_switches.stddev 525594 ± 5% -82.1% 94195 ± 7% sched_debug.cpu.sched_count.0 525022 ± 7% -82.6% 91341 ± 9% sched_debug.cpu.sched_count.1 535427 ± 10% -84.0% 85485 ± 9% sched_debug.cpu.sched_count.2 556754 ± 7% -84.4% 86819 ± 10% sched_debug.cpu.sched_count.3 535700 ± 2% -83.3% 89461 ± 3% sched_debug.cpu.sched_count.avg 594074 ± 4% -82.9% 101334 ± 5% sched_debug.cpu.sched_count.max 485951 ± 6% -83.7% 79152 ± 6% sched_debug.cpu.sched_count.min 40932 ± 44% -79.6% 8357 ± 33% sched_debug.cpu.sched_count.stddev 260676 ± 5% -82.9% 44493 ± 7% sched_debug.cpu.sched_goidle.0 260318 ± 7% -83.5% 43008 ± 9% sched_debug.cpu.sched_goidle.1 265623 ± 10% -84.8% 40286 ± 9% sched_debug.cpu.sched_goidle.2 276372 ± 7% -85.2% 41011 ± 11% sched_debug.cpu.sched_goidle.3 265748 ± 2% -84.1% 42200 ± 3% sched_debug.cpu.sched_goidle.avg 294884 ± 4% -83.7% 48058 ± 5% sched_debug.cpu.sched_goidle.max 240878 ± 6% -84.6% 37148 ± 6% sched_debug.cpu.sched_goidle.min 20456 ± 44% -79.9% 4114 ± 33% sched_debug.cpu.sched_goidle.stddev 266102 ± 5% -83.0% 45259 ± 13% sched_debug.cpu.ttwu_count.0 271621 ± 8% -84.2% 42969 ± 9% sched_debug.cpu.ttwu_count.1 268563 ± 11% -83.5% 44288 ± 16% sched_debug.cpu.ttwu_count.2 259619 ± 8% -84.0% 41599 ± 12% sched_debug.cpu.ttwu_count.3 266477 ± 2% -83.7% 43529 ± 3% sched_debug.cpu.ttwu_count.avg 292475 ± 6% -82.4% 51569 ± 9% sched_debug.cpu.ttwu_count.max 237977 ± 4% -84.6% 36626 ± 6% sched_debug.cpu.ttwu_count.min 20654 ± 49% -72.1% 5763 ± 34% sched_debug.cpu.ttwu_count.stddev lkp-sb02: Sandy Bridge-EP Memory: 4G To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Disclaimer: Results have been estimated based on internal Intel analysis and are provided for informational purposes only. Any difference in system hardware or software design or configuration may affect actual performance. Thanks, Ying Huang