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Re: [lkp] [futex] 65d8fc777f: +25.6% will-it-scale.per_process_ops

From Ingo Molnar <mingo@kernel.org>
Newsgroups linux.kernel
Subject Re: [lkp] [futex] 65d8fc777f: +25.6% will-it-scale.per_process_ops
Date 2016-02-29 10:40 +0100
Message-ID <r7st5-1cj-27@gated-at.bofh.it> (permalink)
References <r7rx1-Av-27@gated-at.bofh.it>
Organization linux.* mail to news gateway

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* kernel test robot <ying.huang@linux.intel.com> wrote:

> FYI, we noticed the below changes on
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master 
> commit 65d8fc777f6dcfee12785c057a6b57f679641c90 ("futex: Remove requirement for 
> lock_page() in get_futex_key()")

I have asked for this before, but let me try again: could you _PLEASE_ make these 
emails more readable?

For example what are the 'below changes'? Changes in the profile output? Profiles 
always change from run to run, so that alone is not informative.

Also, there are a lot of changes - which ones prompted the email to be generated?

All in one, this email is hard to parse, because it just dumps a lot of 
information with very little explanatory structure for someone not versed in their 
format. Please try to create an easy to parse 'story' that leads the reader 
towards what you want these emails to tell - not just a raw dump of seemingly 
unconnected pieces of data ...

Thanks,

	Ingo

> 
> 
> =========================================================================================
> compiler/cpufreq_governor/kconfig/rootfs/tbox_group/test/testcase:
>   gcc-4.9/performance/x86_64-rhel/debian-x86_64-2015-02-07.cgz/lkp-sbx04/futex1/will-it-scale
> 
> commit: 
>   8ad7b378d0d016309014cae0f640434bca7b5e11
>   65d8fc777f6dcfee12785c057a6b57f679641c90
> 
> 8ad7b378d0d01630 65d8fc777f6dcfee12785c057a 
> ---------------- -------------------------- 
>          %stddev     %change         %stddev
>              \          |                \  
>    5076304 ±  0%     +25.6%    6374220 ±  0%  will-it-scale.per_process_ops
>    1194117 ±  0%     +14.4%    1366153 ±  1%  will-it-scale.per_thread_ops
>       0.58 ±  0%      -2.0%       0.57 ±  0%  will-it-scale.scalability
>       6820 ±  0%     -19.6%       5483 ± 15%  meminfo.AnonHugePages
>       2652 ±  5%     -10.4%       2375 ±  2%  vmstat.system.cs
>       2848 ± 32%    +141.2%       6870 ± 65%  numa-meminfo.node1.Active(anon)
>       2832 ± 31%     +57.6%       4465 ± 27%  numa-meminfo.node1.AnonPages
>      15018 ± 12%     -23.3%      11515 ± 15%  numa-meminfo.node2.AnonPages
>       1214 ± 14%     -22.8%     936.75 ± 20%  numa-meminfo.node3.PageTables
>     712.25 ± 32%    +141.2%       1718 ± 65%  numa-vmstat.node1.nr_active_anon
>     708.25 ± 31%     +57.7%       1116 ± 27%  numa-vmstat.node1.nr_anon_pages
>       3754 ± 12%     -23.3%       2879 ± 15%  numa-vmstat.node2.nr_anon_pages
>     304.75 ± 14%     -23.1%     234.50 ± 20%  numa-vmstat.node3.nr_page_table_pages
>       3.53 ±  1%    -100.0%       0.00 ± -1%  perf-profile.cycles.___might_sleep.__might_sleep.get_futex_key.futex_wake.do_futex
>       4.34 ±  1%    -100.0%       0.00 ± -1%  perf-profile.cycles.__might_sleep.get_futex_key.futex_wake.do_futex.sys_futex
>       1.27 ±  3%    -100.0%       0.00 ± -1%  perf-profile.cycles.__wake_up_bit.unlock_page.get_futex_key.futex_wake.do_futex
>       4.36 ±  1%     +29.6%       5.65 ±  1%  perf-profile.cycles.drop_futex_key_refs.isra.12.futex_wake.do_futex.sys_futex.entry_SYSCALL_64_fastpath
>       6.69 ±  1%     +28.1%       8.57 ±  0%  perf-profile.cycles.entry_SYSCALL_64
>       6.73 ±  0%     +30.6%       8.79 ±  0%  perf-profile.cycles.entry_SYSCALL_64_after_swapgs
>      74.21 ±  0%     -11.0%      66.06 ±  0%  perf-profile.cycles.futex_wake.do_futex.sys_futex.entry_SYSCALL_64_fastpath
>      59.05 ±  0%     -21.4%      46.40 ±  0%  perf-profile.cycles.get_futex_key.futex_wake.do_futex.sys_futex.entry_SYSCALL_64_fastpath
>       4.12 ±  0%     +78.5%       7.36 ±  1%  perf-profile.cycles.get_futex_key_refs.isra.11.futex_wake.do_futex.sys_futex.entry_SYSCALL_64_fastpath
>       2.27 ±  3%     +24.1%       2.82 ±  4%  perf-profile.cycles.get_user_pages_fast.futex_wake.do_futex.sys_futex.entry_SYSCALL_64_fastpath
>      26.95 ±  0%     +30.0%      35.04 ±  1%  perf-profile.cycles.get_user_pages_fast.get_futex_key.futex_wake.do_futex.sys_futex
>      13.43 ±  0%     +27.2%      17.09 ±  1%  perf-profile.cycles.gup_pte_range.gup_pud_range.get_user_pages_fast.get_futex_key.futex_wake
>      19.66 ±  1%     +28.4%      25.24 ±  0%  perf-profile.cycles.gup_pud_range.get_user_pages_fast.get_futex_key.futex_wake.do_futex
>       4.33 ±  1%     +37.0%       5.93 ±  4%  perf-profile.cycles.hash_futex.do_futex.sys_futex.entry_SYSCALL_64_fastpath
>      13.59 ±  0%    -100.0%       0.00 ± -1%  perf-profile.cycles.unlock_page.get_futex_key.futex_wake.do_futex.sys_futex
>      15160 ± 19%     -34.8%       9883 ±  0%  sched_debug.cfs_rq:/.exec_clock.min
>      27.25 ± 15%     -37.6%      17.00 ±  8%  sched_debug.cfs_rq:/.load_avg.7
>      21.00 ± 38%     -27.4%      15.25 ±  2%  sched_debug.cpu.cpu_load[2].1
>      21.00 ± 38%     -27.4%      15.25 ±  2%  sched_debug.cpu.cpu_load[3].1
>      21.00 ± 38%     -27.4%      15.25 ±  2%  sched_debug.cpu.cpu_load[4].1
>       1790 ±  0%     +42.4%       2549 ± 45%  sched_debug.cpu.curr->pid.21
>      50033 ±  4%      -6.8%      46622 ±  4%  sched_debug.cpu.nr_load_updates.29
>       4398 ± 42%    +103.5%       8949 ± 23%  sched_debug.cpu.nr_switches.11
>       7452 ± 34%    +111.3%      15744 ± 54%  sched_debug.cpu.nr_switches.20
>       3739 ± 13%    +213.5%      11723 ± 40%  sched_debug.cpu.nr_switches.23
>       1648 ± 53%     +96.5%       3239 ± 63%  sched_debug.cpu.nr_switches.51
>       0.25 ±519%   -1300.0%      -3.00 ±-52%  sched_debug.cpu.nr_uninterruptible.24
>       8632 ± 16%     -32.5%       5823 ± 19%  sched_debug.cpu.sched_count.1
>       5091 ± 36%    +137.5%      12092 ± 31%  sched_debug.cpu.sched_count.11
>      12453 ± 90%     -74.6%       3159 ± 24%  sched_debug.cpu.sched_count.2
>       7782 ± 32%    +118.2%      16977 ± 46%  sched_debug.cpu.sched_count.20
>       2665 ± 48%     -49.8%       1337 ± 30%  sched_debug.cpu.sched_count.32
>       1365 ± 11%     -14.0%       1174 ±  3%  sched_debug.cpu.sched_count.45
>       1693 ± 51%    +147.7%       4193 ± 42%  sched_debug.cpu.sched_count.51
>       5023 ± 57%     -51.5%       2434 ± 43%  sched_debug.cpu.sched_count.57
>       1705 ± 16%    +129.6%       3915 ± 48%  sched_debug.cpu.sched_goidle.23
>     536.25 ± 14%     -18.7%     435.75 ±  2%  sched_debug.cpu.sched_goidle.45
>       1228 ± 19%     -27.3%     892.50 ± 17%  sched_debug.cpu.sched_goidle.5
>       1919 ± 55%     +88.5%       3617 ± 37%  sched_debug.cpu.ttwu_count.11
>       7699 ± 35%     -43.7%       4335 ± 43%  sched_debug.cpu.ttwu_count.24
>       5380 ± 36%     -45.6%       2926 ± 18%  sched_debug.cpu.ttwu_count.30
>     563.25 ± 20%    +140.3%       1353 ± 38%  sched_debug.cpu.ttwu_local.11
>       4297 ± 46%     -49.1%       2186 ± 39%  sched_debug.cpu.ttwu_local.24
>       2828 ± 47%     -47.8%       1475 ± 34%  sched_debug.cpu.ttwu_local.27
>       3243 ± 36%     -54.3%       1482 ± 32%  sched_debug.cpu.ttwu_local.30
>     199.25 ±  6%    +100.6%     399.75 ± 32%  sched_debug.cpu.ttwu_local.44
>       1158 ± 64%     -67.3%     379.00 ± 46%  sched_debug.cpu.ttwu_local.54
>     242.25 ± 21%     +51.0%     365.75 ± 19%  sched_debug.cpu.ttwu_local.55
>       1009 ± 26%     -50.8%     496.50 ± 44%  sched_debug.cpu.ttwu_local.59
>       1736 ± 53%     -67.8%     559.25 ± 22%  sched_debug.cpu.ttwu_local.9
> 
> 
> lkp-sbx04: Sandy Bridge-EX
> Memory: 64G
> 
> 
>    perf-profile.cycles.futex_wake.do_futex.sys_futex.entry_SYSCALL_64_fastpath
> 
>   76 ++---------------------------------------------------------------------+
>      |                                                                      |
>   74 ++   .*..        .*..*..*..     .*..    .*..  .*..  .*..  .*..*..*..*  |
>      *..*.    *..*..*.          *..*.    *.*.    *.    *.    *.             |
>      |                                                                      |
>   72 ++                                                                     |
>      |                                                                      |
>   70 ++                                                                     |
>      |                                                                      |
>   68 ++                                                                     |
>      |                                                                      |
>      |                          O  O  O    O  O  O  O     O  O     O  O     |
>   66 O+                                  O             O        O        O  O
>      |  O  O  O  O     O  O  O                                              |
>   64 ++-------------O-------------------------------------------------------+
> 
> 
> 
>                              will-it-scale.per_process_ops
> 
>   6.6e+06 O+----O-O--O------------------------------------------------------+
>           |  O          O  O O  O                                           |
>   6.4e+06 ++                       O  O O  O  O  O O  O  O  O O  O  O  O O  O
>           |                                                                 |
>   6.2e+06 ++                                                                |
>     6e+06 ++                                                                |
>           |                                                                 |
>   5.8e+06 ++                                                                |
>           |                                                                 |
>   5.6e+06 ++                                                                |
>   5.4e+06 ++                                                                |
>           |                                                                 |
>   5.2e+06 ++                                                                |
>           *..*..*.*..*..*..*.*..*..*..*.*..*..*..*.*..*..*..*.*..*..*..*.*  |
>     5e+06 ++----------------------------------------------------------------+
> 
> 
> 	[*] bisect-good sample
> 	[O] bisect-bad  sample
> 
> 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

> ---
> LKP_SERVER: inn
> LKP_CGI_PORT: 80
> LKP_CIFS_PORT: 139
> testcase: will-it-scale
> default-monitors:
>   wait: activate-monitor
>   kmsg: 
>   uptime: 
>   iostat: 
>   heartbeat: 
>   vmstat: 
>   numa-numastat: 
>   numa-vmstat: 
>   numa-meminfo: 
>   proc-vmstat: 
>   proc-stat:
>     interval: 10
>   meminfo: 
>   slabinfo: 
>   interrupts: 
>   lock_stat: 
>   latency_stats: 
>   softirqs: 
>   bdi_dev_mapping: 
>   diskstats: 
>   nfsstat: 
>   cpuidle: 
>   cpufreq-stats: 
>   turbostat: 
>   pmeter: 
>   sched_debug:
>     interval: 60
> cpufreq_governor: performance
> default-watchdogs:
>   oom-killer: 
>   watchdog: 
> commit: 65d8fc777f6dcfee12785c057a6b57f679641c90
> model: Sandy Bridge-EX
> nr_cpu: 64
> memory: 64G
> nr_ssd_partitions: 7
> ssd_partitions: "/dev/disk/by-id/ata-INTEL_SSDSC2*-part1"
> swap_partitions: 
> category: benchmark
> perf-profile:
>   freq: 800
> will-it-scale:
>   test: futex1
> queue: bisect
> testbox: lkp-sbx04
> tbox_group: lkp-sbx04
> kconfig: x86_64-rhel
> enqueue_time: 2016-02-28 23:45:52.199165563 +08:00
> compiler: gcc-4.9
> rootfs: debian-x86_64-2015-02-07.cgz
> id: 6b2c2bd744dd898009648cb82de7e0ba77de33f1
> user: lkp
> head_commit: ed520c327c4259ec08b1677023087f658329b961
> base_commit: 81f70ba233d5f660e1ea5fe23260ee323af5d53a
> branch: linux-devel/devel-hourly-2016022811
> result_root: "/result/will-it-scale/performance-futex1/lkp-sbx04/debian-x86_64-2015-02-07.cgz/x86_64-rhel/gcc-4.9/65d8fc777f6dcfee12785c057a6b57f679641c90/0"
> job_file: "/lkp/scheduled/lkp-sbx04/bisect_will-it-scale-performance-futex1-debian-x86_64-2015-02-07.cgz-x86_64-rhel-65d8fc777f6dcfee12785c057a6b57f679641c90-20160228-23650-17c4qc1-0.yaml"
> max_uptime: 1500
> initrd: "/osimage/debian/debian-x86_64-2015-02-07.cgz"
> bootloader_append:
> - root=/dev/ram0
> - user=lkp
> - job=/lkp/scheduled/lkp-sbx04/bisect_will-it-scale-performance-futex1-debian-x86_64-2015-02-07.cgz-x86_64-rhel-65d8fc777f6dcfee12785c057a6b57f679641c90-20160228-23650-17c4qc1-0.yaml
> - ARCH=x86_64
> - kconfig=x86_64-rhel
> - branch=linux-devel/devel-hourly-2016022811
> - commit=65d8fc777f6dcfee12785c057a6b57f679641c90
> - BOOT_IMAGE=/pkg/linux/x86_64-rhel/gcc-4.9/65d8fc777f6dcfee12785c057a6b57f679641c90/vmlinuz-4.5.0-rc3-00235-g65d8fc7
> - max_uptime=1500
> - RESULT_ROOT=/result/will-it-scale/performance-futex1/lkp-sbx04/debian-x86_64-2015-02-07.cgz/x86_64-rhel/gcc-4.9/65d8fc777f6dcfee12785c057a6b57f679641c90/0
> - LKP_SERVER=inn
> - |2-
> 
> 
>   earlyprintk=ttyS0,115200 systemd.log_level=err
>   debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100
>   panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0
>   console=ttyS0,115200 console=tty0 vga=normal
> 
>   rw
> lkp_initrd: "/lkp/lkp/lkp-x86_64.cgz"
> modules_initrd: "/pkg/linux/x86_64-rhel/gcc-4.9/65d8fc777f6dcfee12785c057a6b57f679641c90/modules.cgz"
> bm_initrd: "/osimage/deps/debian-x86_64-2015-02-07.cgz/lkp.cgz,/osimage/deps/debian-x86_64-2015-02-07.cgz/run-ipconfig.cgz,/osimage/deps/debian-x86_64-2015-02-07.cgz/turbostat.cgz,/lkp/benchmarks/turbostat.cgz,/osimage/deps/debian-x86_64-2015-02-07.cgz/will-it-scale.cgz,/lkp/benchmarks/will-it-scale.cgz,/lkp/benchmarks/will-it-scale-x86_64.cgz"
> linux_headers_initrd: "/pkg/linux/x86_64-rhel/gcc-4.9/65d8fc777f6dcfee12785c057a6b57f679641c90/linux-headers.cgz"
> repeat_to: 2
> kernel: "/pkg/linux/x86_64-rhel/gcc-4.9/65d8fc777f6dcfee12785c057a6b57f679641c90/vmlinuz-4.5.0-rc3-00235-g65d8fc7"
> dequeue_time: 2016-02-28 23:46:33.938915178 +08:00
> job_state: finished
> loadavg: 45.27 20.12 7.84 2/649 11559
> start_time: '1456674445'
> end_time: '1456674754'
> version: "/lkp/lkp/.src-20160226-194908"

> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu10/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu11/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu12/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu13/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu14/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu15/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu16/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu17/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu18/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu19/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu20/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu21/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu22/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu23/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu24/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu25/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu26/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu27/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu28/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu29/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu30/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu31/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu32/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu33/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu34/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu35/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu36/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu37/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu38/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu39/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu4/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu40/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu41/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu42/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu43/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu44/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu45/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu46/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu47/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu48/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu49/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu5/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu50/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu51/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu52/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu53/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu54/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu55/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu56/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu57/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu58/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu59/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu6/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu60/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu61/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu62/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu63/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu7/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu8/cpufreq/scaling_governor
> 2016-02-28 23:47:24 echo performance > /sys/devices/system/cpu/cpu9/cpufreq/scaling_governor
> 2016-02-28 23:47:25 ./runtest.py futex1 16 both 1 8 16 24 32 48 64

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[lkp] [futex] 65d8fc777f: +25.6% will-it-scale.per_process_ops kernel test robot <ying.huang@linux.intel.com> - 2016-02-29 09:40 +0100
  Re: [lkp] [futex] 65d8fc777f: +25.6% will-it-scale.per_process_ops Ingo Molnar <mingo@kernel.org> - 2016-02-29 10:40 +0100
    Re: [lkp] [futex] 65d8fc777f: +25.6% will-it-scale.per_process_ops Davidlohr Bueso <dave@stgolabs.net> - 2016-02-29 18:40 +0100
    Re: [LKP] [lkp] [futex] 65d8fc777f: +25.6% will-it-scale.per_process_ops "Huang\, Ying" <ying.huang@intel.com> - 2016-03-01 09:40 +0100

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