Re: [LKP] [/proc/stat] 3047027b34: reaim.jobs_per_min -4.8% regression

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On Fri, Jan 18, 2019 at 9:44 PM kernel test robot <rong.a.chen@xxxxxxxxx> wrote:
>
> Greeting,
>
> FYI, we noticed a -4.8% regression of reaim.jobs_per_min due to commit:
>
>
> commit: 3047027b34b8c6404b509903058b89836093acc7 ("[PATCH 2/2] /proc/stat: Add sysctl parameter to control irq counts latency")
> url: https://github.com/0day-ci/linux/commits/Waiman-Long/proc-stat-Reduce-irqs-counting-performance-overhead/20190108-104818

Is this expected? (And it seems like other things in the report below
are faster? I don't understand why this particular regression was
called out?)

-Kees

>
>
> in testcase: reaim
> on test machine: 56 threads Intel(R) Xeon(R) CPU E5-2695 v3 @ 2.30GHz with 256G memory
> with following parameters:
>
>         runtime: 300s
>         nr_task: 5000
>         test: shared_memory
>         cpufreq_governor: performance
>         ucode: 0x3d
>
> test-description: REAIM is an updated and improved version of AIM 7 benchmark.
> test-url: https://sourceforge.net/projects/re-aim-7/
>
>
>
> Details are as below:
> -------------------------------------------------------------------------------------------------->
>
>
> To reproduce:
>
>         git clone https://github.com/intel/lkp-tests.git
>         cd lkp-tests
>         bin/lkp install job.yaml  # job file is attached in this email
>         bin/lkp run     job.yaml
>
> =========================================================================================
> compiler/cpufreq_governor/kconfig/nr_task/rootfs/runtime/tbox_group/test/testcase/ucode:
>   gcc-7/performance/x86_64-rhel-7.2/5000/debian-x86_64-2018-04-03.cgz/300s/lkp-hsw-ep5/shared_memory/reaim/0x3d
>
> commit:
>   51e8bce392 ("/proc/stat: Extract irqs counting code into show_stat_irqs()")
>   3047027b34 ("/proc/stat: Add sysctl parameter to control irq counts latency")
>
> 51e8bce392dd2cc9 3047027b34b8c6404b50990305
> ---------------- --------------------------
>        fail:runs  %reproduction    fail:runs
>            |             |             |
>           1:4          -25%            :4     kmsg.igb#:#:#:exceed_max#second
>          %stddev     %change         %stddev
>              \          |                \
>     101.96            +7.5%     109.60        reaim.child_systime
>      33.32            -1.8%      32.73        reaim.child_utime
>    5534451            -4.8%    5271308        reaim.jobs_per_min
>       1106            -4.8%       1054        reaim.jobs_per_min_child
>    5800927            -4.9%    5517884        reaim.max_jobs_per_min
>       5.42            +5.0%       5.69        reaim.parent_time
>       1.51            +5.3%       1.59        reaim.std_dev_time
>   29374932            -2.8%   28558608        reaim.time.minor_page_faults
>       1681            +1.6%       1708        reaim.time.percent_of_cpu_this_job_got
>       3841            +4.5%       4012        reaim.time.system_time
>       1234            -4.4%       1180        reaim.time.user_time
>   18500000            -2.7%   18000000        reaim.workload
>    5495296 ±  9%      -9.5%    4970496        meminfo.DirectMap2M
>       5142 ± 18%     -43.2%       2920 ± 46%  numa-vmstat.node0.nr_shmem
>      29.00 ± 32%     +56.9%      45.50 ± 10%  vmstat.procs.r
>      67175 ± 37%     +66.6%     111910 ± 20%  numa-meminfo.node0.AnonHugePages
>      20591 ± 18%     -43.2%      11691 ± 46%  numa-meminfo.node0.Shmem
>      64688 ±  6%     -36.8%      40906 ± 19%  slabinfo.kmalloc-8.active_objs
>      64691 ±  6%     -36.8%      40908 ± 19%  slabinfo.kmalloc-8.num_objs
>      37.36 ±  7%     +11.1%      41.53 ±  4%  boot-time.boot
>      29.15 ±  6%     +14.3%      33.31 ±  3%  boot-time.dhcp
>     847.73 ±  9%     +12.9%     957.09 ±  4%  boot-time.idle
>     202.50 ±100%    +101.7%     408.50        proc-vmstat.nr_mlock
>       8018 ±  9%     -12.3%       7034 ±  2%  proc-vmstat.nr_shmem
>   29175944            -2.8%   28369676        proc-vmstat.numa_hit
>   29170351            -2.8%   28364111        proc-vmstat.numa_local
>       5439 ±  5%     -18.7%       4423 ±  7%  proc-vmstat.pgactivate
>   30220220            -2.8%   29374906        proc-vmstat.pgalloc_normal
>   30182224            -2.7%   29368266        proc-vmstat.pgfault
>   30186671            -2.8%   29341792        proc-vmstat.pgfree
>      69510 ± 12%     -34.2%      45759 ± 33%  sched_debug.cfs_rq:/.load.avg
>      30.21 ± 24%     -33.6%      20.05 ± 20%  sched_debug.cfs_rq:/.runnable_load_avg.avg
>      66447 ± 12%     -37.6%      41460 ± 37%  sched_debug.cfs_rq:/.runnable_weight.avg
>      12.35 ±  4%     +88.0%      23.22 ± 15%  sched_debug.cpu.clock.stddev
>      12.35 ±  4%     +88.0%      23.22 ± 15%  sched_debug.cpu.clock_task.stddev
>      30.06 ± 12%     -26.5%      22.10 ± 13%  sched_debug.cpu.cpu_load[0].avg
>      29.37 ±  9%     -22.6%      22.72 ± 13%  sched_debug.cpu.cpu_load[1].avg
>      28.71 ±  6%     -21.1%      22.66 ± 16%  sched_debug.cpu.cpu_load[2].avg
>      17985           -12.0%      15823 ±  2%  sched_debug.cpu.curr->pid.max
>      67478 ±  6%     -32.5%      45531 ± 24%  sched_debug.cpu.load.avg
>      10369 ± 49%    -100.0%       0.00        sched_debug.cpu.load.min
>       0.21 ± 34%    -100.0%       0.00        sched_debug.cpu.nr_running.min
>      12.98           -16.3%      10.86 ± 11%  perf-stat.i.MPKI
>  5.712e+09            -3.8%  5.492e+09        perf-stat.i.branch-instructions
>  1.024e+08            -3.7%   98557208        perf-stat.i.branch-misses
>       8.17            +0.4        8.58 ±  2%  perf-stat.i.cache-miss-rate%
>    7839589           +10.5%    8659798        perf-stat.i.cache-misses
>   86324420            +3.8%   89595898 ±  2%  perf-stat.i.cache-references
>       1.55 ±  2%      -4.0%       1.49        perf-stat.i.cpi
>       2290            -1.9%       2246        perf-stat.i.cpu-migrations
>       4667           -10.9%       4160        perf-stat.i.cycles-between-cache-misses
>  8.749e+09            -3.9%  8.409e+09        perf-stat.i.dTLB-loads
>     527660 ±  3%     -15.0%     448539 ±  5%  perf-stat.i.dTLB-store-misses
>  5.747e+09            -4.3%  5.499e+09        perf-stat.i.dTLB-stores
>   53047071            -3.5%   51190942        perf-stat.i.iTLB-load-misses
>   20576112           -13.7%   17759009 ±  2%  perf-stat.i.iTLB-loads
>  3.207e+10            -3.9%  3.083e+10        perf-stat.i.instructions
>       0.77            -2.3%       0.75        perf-stat.i.ipc
>      99933            -3.8%      96127        perf-stat.i.minor-faults
>    4325719            +5.6%    4568226        perf-stat.i.node-load-misses
>      52.39            -2.0       50.36        perf-stat.i.node-store-miss-rate%
>    1411700           +20.9%    1706321        perf-stat.i.node-store-misses
>     883790           +34.1%    1184836        perf-stat.i.node-stores
>      99933            -3.8%      96127        perf-stat.i.page-faults
>       2.69            +7.9%       2.91        perf-stat.overall.MPKI
>       9.08            +0.6        9.67 ±  2%  perf-stat.overall.cache-miss-rate%
>       1.13            +5.0%       1.19        perf-stat.overall.cpi
>       4633            -8.6%       4233        perf-stat.overall.cycles-between-cache-misses
>       0.01 ±  2%      -0.0        0.01 ±  4%  perf-stat.overall.dTLB-store-miss-rate%
>      72.05            +2.2       74.24        perf-stat.overall.iTLB-load-miss-rate%
>       0.88            -4.8%       0.84        perf-stat.overall.ipc
>      78.12            +1.4       79.52        perf-stat.overall.node-load-miss-rate%
>      61.49            -2.5       59.01        perf-stat.overall.node-store-miss-rate%
>  5.688e+09            -3.8%  5.471e+09        perf-stat.ps.branch-instructions
>   1.02e+08            -3.7%   98177745        perf-stat.ps.branch-misses
>    7807912           +10.5%    8626353        perf-stat.ps.cache-misses
>   85999504            +3.8%   89266688 ±  2%  perf-stat.ps.cache-references
>       2282            -1.9%       2239        perf-stat.ps.cpu-migrations
>  8.713e+09            -3.9%  8.376e+09        perf-stat.ps.dTLB-loads
>     525761 ±  3%     -15.0%     446967 ±  5%  perf-stat.ps.dTLB-store-misses
>  5.723e+09            -4.3%  5.478e+09        perf-stat.ps.dTLB-stores
>   52823322            -3.5%   50990190        perf-stat.ps.iTLB-load-misses
>   20490261           -13.7%   17689923 ±  2%  perf-stat.ps.iTLB-loads
>  3.193e+10            -3.8%  3.071e+10        perf-stat.ps.instructions
>      99560            -3.8%      95786        perf-stat.ps.minor-faults
>    4308031            +5.6%    4550453        perf-stat.ps.node-load-misses
>    1405805           +20.9%    1699670        perf-stat.ps.node-store-misses
>     880319           +34.1%    1180378        perf-stat.ps.node-stores
>      99560            -3.8%      95786        perf-stat.ps.page-faults
>  9.664e+12            -2.8%  9.397e+12        perf-stat.total.instructions
>      33.09 ±  7%     -25.0        8.10 ± 45%  perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe
>      32.21 ±  7%     -24.3        7.92 ± 45%  perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe
>      22.36 ±  7%     -17.1        5.24 ± 49%  perf-profile.calltrace.cycles-pp.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe
>      10.57 ±  5%      -8.3        2.31 ± 48%  perf-profile.calltrace.cycles-pp.entry_SYSCALL_64
>       9.60 ±  4%      -7.6        2.03 ± 49%  perf-profile.calltrace.cycles-pp.syscall_return_via_sysret
>       3.68 ±  8%      -3.3        0.43 ±102%  perf-profile.calltrace.cycles-pp.security_ipc_permission.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe
>       4.37 ±  9%      -2.8        1.60 ± 50%  perf-profile.calltrace.cycles-pp.ipc_obtain_object_check.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe
>       2.30 ±  2%      -1.9        0.44 ±102%  perf-profile.calltrace.cycles-pp.security_sem_semop.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe
>       5.10 ±  3%      -1.6        3.46 ± 10%  perf-profile.calltrace.cycles-pp.ipc_has_perm.security_ipc_permission.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe
>       3.20            -1.3        1.95 ± 23%  perf-profile.calltrace.cycles-pp.avc_has_perm.ipc_has_perm.security_ipc_permission.do_semtimedop.do_syscall_64
>       2.12 ±  3%      -0.4        1.76 ±  4%  perf-profile.calltrace.cycles-pp.avc_has_perm.ipc_has_perm.security_sem_semop.do_semtimedop.do_syscall_64
>       1.03 ±  2%      -0.1        0.94 ±  3%  perf-profile.calltrace.cycles-pp.__do_page_fault.do_page_fault.page_fault
>       1.06 ±  2%      -0.1        0.97 ±  3%  perf-profile.calltrace.cycles-pp.do_page_fault.page_fault
>       1.06 ±  2%      -0.1        0.98 ±  3%  perf-profile.calltrace.cycles-pp.page_fault
>       0.91 ±  3%      -0.1        0.82 ±  3%  perf-profile.calltrace.cycles-pp.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
>       0.86 ±  3%      -0.1        0.78 ±  3%  perf-profile.calltrace.cycles-pp.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
>       0.61 ± 12%      +0.2        0.79 ± 12%  perf-profile.calltrace.cycles-pp.smp_apic_timer_interrupt.apic_timer_interrupt.cpuidle_enter_state.do_idle.cpu_startup_entry
>       0.61 ± 10%      +0.2        0.79 ± 10%  perf-profile.calltrace.cycles-pp.shm_close.remove_vma.__do_munmap.ksys_shmdt.do_syscall_64
>       0.67 ± 11%      +0.2        0.86 ± 10%  perf-profile.calltrace.cycles-pp.apic_timer_interrupt.cpuidle_enter_state.do_idle.cpu_startup_entry.start_secondary
>       0.40 ± 57%      +0.2        0.62 ±  8%  perf-profile.calltrace.cycles-pp.call_rwsem_down_write_failed.down_write.do_shmat.__x64_sys_shmat.do_syscall_64
>       0.40 ± 57%      +0.2        0.62 ±  7%  perf-profile.calltrace.cycles-pp.rwsem_down_write_failed.call_rwsem_down_write_failed.down_write.do_shmat.__x64_sys_shmat
>       0.43 ± 57%      +0.2        0.66 ±  7%  perf-profile.calltrace.cycles-pp.down_write.do_shmat.__x64_sys_shmat.do_syscall_64.entry_SYSCALL_64_after_hwframe
>       0.41 ± 57%      +0.3        0.67 ±  9%  perf-profile.calltrace.cycles-pp.call_rwsem_down_write_failed.down_write.shm_close.remove_vma.__do_munmap
>       0.40 ± 57%      +0.3        0.66 ±  7%  perf-profile.calltrace.cycles-pp.down_write.ipcget.__x64_sys_shmget.do_syscall_64.entry_SYSCALL_64_after_hwframe
>       0.41 ± 57%      +0.3        0.67 ±  9%  perf-profile.calltrace.cycles-pp.rwsem_down_write_failed.call_rwsem_down_write_failed.down_write.shm_close.remove_vma
>       0.44 ± 57%      +0.3        0.71 ±  9%  perf-profile.calltrace.cycles-pp.down_write.shm_close.remove_vma.__do_munmap.ksys_shmdt
>       0.26 ±100%      +0.4        0.67 ±  8%  perf-profile.calltrace.cycles-pp.dput.__fput.task_work_run.exit_to_usermode_loop.do_syscall_64
>       0.28 ±100%      +0.4        0.71 ±  7%  perf-profile.calltrace.cycles-pp.__might_fault._copy_from_user.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe
>       0.58 ± 10%      +0.4        1.03 ±  6%  perf-profile.calltrace.cycles-pp.shmctl_down.ksys_shmctl.do_syscall_64.entry_SYSCALL_64_after_hwframe.shmctl
>       0.59 ± 10%      +0.5        1.05 ±  6%  perf-profile.calltrace.cycles-pp.ksys_shmctl.do_syscall_64.entry_SYSCALL_64_after_hwframe.shmctl
>       0.13 ±173%      +0.5        0.62 ±  7%  perf-profile.calltrace.cycles-pp.call_rwsem_down_write_failed.down_write.ipcget.__x64_sys_shmget.do_syscall_64
>       0.13 ±173%      +0.5        0.62 ±  7%  perf-profile.calltrace.cycles-pp.rwsem_down_write_failed.call_rwsem_down_write_failed.down_write.ipcget.__x64_sys_shmget
>       0.12 ±173%      +0.5        0.66 ±  8%  perf-profile.calltrace.cycles-pp.dentry_kill.dput.__fput.task_work_run.exit_to_usermode_loop
>       0.00            +0.6        0.58 ±  7%  perf-profile.calltrace.cycles-pp.copy_user_generic_unrolled._copy_from_user.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe
>       0.00            +0.6        0.60 ±  7%  perf-profile.calltrace.cycles-pp.unmap_region.__do_munmap.ksys_shmdt.do_syscall_64.entry_SYSCALL_64_after_hwframe
>       0.00            +0.6        0.61 ±  7%  perf-profile.calltrace.cycles-pp.wait_consider_task.do_wait.kernel_wait4.__do_sys_wait4.do_syscall_64
>       0.00            +0.6        0.62 ±  4%  perf-profile.calltrace.cycles-pp.semctl_down.ksys_semctl.do_syscall_64.entry_SYSCALL_64_after_hwframe.semctl
>       0.75 ±  8%      +0.6        1.38 ±  8%  perf-profile.calltrace.cycles-pp.__x64_sys_semop.do_syscall_64.entry_SYSCALL_64_after_hwframe.semop
>       0.00            +0.6        0.65 ±  9%  perf-profile.calltrace.cycles-pp.ipcperms.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe.semop
>       0.00            +0.6        0.65 ±  8%  perf-profile.calltrace.cycles-pp.__dentry_kill.dentry_kill.dput.__fput.task_work_run
>       0.89 ± 11%      +0.7        1.57 ±  8%  perf-profile.calltrace.cycles-pp.do_shmat.__x64_sys_shmat.do_syscall_64.entry_SYSCALL_64_after_hwframe.shmat
>       0.90 ± 11%      +0.7        1.58 ±  8%  perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.shmat
>       0.90 ± 10%      +0.7        1.58 ±  8%  perf-profile.calltrace.cycles-pp.__x64_sys_shmat.do_syscall_64.entry_SYSCALL_64_after_hwframe.shmat
>       0.00            +0.7        0.68 ±  5%  perf-profile.calltrace.cycles-pp.do_wait.kernel_wait4.__do_sys_wait4.do_syscall_64.entry_SYSCALL_64_after_hwframe
>       0.00            +0.7        0.69 ±  6%  perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.wait
>       0.00            +0.7        0.69 ±  6%  perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.wait
>       0.00            +0.7        0.69 ±  6%  perf-profile.calltrace.cycles-pp.__do_sys_wait4.do_syscall_64.entry_SYSCALL_64_after_hwframe.wait
>       0.00            +0.7        0.69 ±  6%  perf-profile.calltrace.cycles-pp.kernel_wait4.__do_sys_wait4.do_syscall_64.entry_SYSCALL_64_after_hwframe.wait
>       0.90 ± 11%      +0.7        1.59 ±  8%  perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.shmat
>       0.00            +0.7        0.69 ±  5%  perf-profile.calltrace.cycles-pp.wait
>       0.27 ±100%      +0.7        0.99 ±  7%  perf-profile.calltrace.cycles-pp.perform_atomic_semop.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe.semop
>       0.95 ± 11%      +0.7        1.67 ±  8%  perf-profile.calltrace.cycles-pp.shmat
>       0.00            +0.7        0.73 ±  6%  perf-profile.calltrace.cycles-pp.ipcget.ksys_semget.do_syscall_64.entry_SYSCALL_64_after_hwframe.semget
>       0.00            +0.7        0.74 ±  8%  perf-profile.calltrace.cycles-pp.task_work_run.exit_to_usermode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.shmctl
>       0.72 ±  9%      +0.7        1.46 ±  7%  perf-profile.calltrace.cycles-pp._raw_spin_lock.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe.semop
>       0.00            +0.8        0.75 ±  5%  perf-profile.calltrace.cycles-pp.ksys_semget.do_syscall_64.entry_SYSCALL_64_after_hwframe.semget
>       0.00            +0.8        0.76 ±  8%  perf-profile.calltrace.cycles-pp.exit_to_usermode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.shmctl
>       0.89 ±  9%      +0.8        1.65 ±  9%  perf-profile.calltrace.cycles-pp.__do_munmap.ksys_shmdt.do_syscall_64.entry_SYSCALL_64_after_hwframe.shmdt
>       0.00            +0.8        0.76 ±  5%  perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.semget
>       0.00            +0.8        0.76 ±  5%  perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.semget
>       0.90 ±  9%      +0.8        1.68 ±  9%  perf-profile.calltrace.cycles-pp.ksys_shmdt.do_syscall_64.entry_SYSCALL_64_after_hwframe.shmdt
>       0.00            +0.8        0.78 ±  6%  perf-profile.calltrace.cycles-pp.ksys_semctl.do_syscall_64.entry_SYSCALL_64_after_hwframe.semctl
>       0.00            +0.8        0.80 ±  5%  perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.semctl
>       0.00            +0.8        0.80 ±  5%  perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.semctl
>       0.00            +0.8        0.85 ±  5%  perf-profile.calltrace.cycles-pp.semget
>       0.97 ±  9%      +0.8        1.82 ±  6%  perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.shmctl
>       0.97 ±  9%      +0.8        1.82 ±  7%  perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.shmctl
>       0.94 ± 10%      +0.9        1.79 ±  6%  perf-profile.calltrace.cycles-pp._copy_from_user.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe.semop
>       1.04 ±  9%      +0.9        1.91 ±  6%  perf-profile.calltrace.cycles-pp.ipcget.__x64_sys_shmget.do_syscall_64.entry_SYSCALL_64_after_hwframe.shmget
>       1.05 ±  9%      +0.9        1.92 ±  5%  perf-profile.calltrace.cycles-pp.__x64_sys_shmget.do_syscall_64.entry_SYSCALL_64_after_hwframe.shmget
>       1.05 ±  9%      +0.9        1.93 ±  6%  perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.shmget
>       1.05 ±  9%      +0.9        1.93 ±  6%  perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.shmget
>       1.02 ±  9%      +0.9        1.92 ±  7%  perf-profile.calltrace.cycles-pp.shmctl
>       1.00 ±  9%      +0.9        1.93 ±  9%  perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.shmdt
>       1.00 ±  8%      +0.9        1.94 ±  9%  perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.shmdt
>       1.13 ±  8%      +0.9        2.08 ±  6%  perf-profile.calltrace.cycles-pp.shmget
>       0.00            +1.0        0.97 ±  5%  perf-profile.calltrace.cycles-pp.semctl
>       1.03 ±  9%      +1.0        1.99 ±  5%  perf-profile.calltrace.cycles-pp.do_smart_update.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe.semop
>       1.04 ±  8%      +1.0        2.03 ±  9%  perf-profile.calltrace.cycles-pp.shmdt
>       2.61 ±  9%      +1.3        3.89 ± 14%  perf-profile.calltrace.cycles-pp.security_ipc_permission.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe.semop
>       1.65 ± 13%      +2.0        3.65 ±  7%  perf-profile.calltrace.cycles-pp.security_sem_semop.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe.semop
>       1.61 ±  6%      +5.3        6.89 ±  2%  perf-profile.calltrace.cycles-pp.idr_find.ipc_obtain_object_check.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe
>       6.45 ±  9%      +6.2       12.63 ±  6%  perf-profile.calltrace.cycles-pp.syscall_return_via_sysret.semop
>       2.92 ±  5%      +8.0       10.88 ±  7%  perf-profile.calltrace.cycles-pp.ipc_obtain_object_check.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe.semop
>       9.07 ±  8%      +8.8       17.85 ±  6%  perf-profile.calltrace.cycles-pp.entry_SYSCALL_64.semop
>      15.56 ±  8%     +18.8       34.38 ±  6%  perf-profile.calltrace.cycles-pp.do_semtimedop.do_syscall_64.entry_SYSCALL_64_after_hwframe.semop
>      17.40 ±  8%     +20.4       37.82 ±  6%  perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.semop
>      17.99 ±  8%     +21.0       39.00 ±  6%  perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.semop
>      33.85 ±  8%     +36.1       69.98 ±  6%  perf-profile.calltrace.cycles-pp.semop
>
>
>
>                       reaim.time.percent_of_cpu_this_job_got
>
>   1800 +-+------------------------------------------------------------------+
>        |         O                                                          |
>   1780 +-OO O O     O                                                       |
>   1760 O-+     O   O  OO                                                    |
>        |                                                                    |
>   1740 +-+                                                                  |
>        |                                                                    |
>   1720 +-+                  O                       .+.                     |
>        |                   O  O                    +   +                    |
>   1700 +-+               O                       .+    :                    |
>   1680 +-+      .+      .+.    .+ .+.+         .+       :         +.  .+.++.|
>        |.++.+.++  :  .++   ++.+  +    +.+.++.++         +.+.++.+.+  ++      |
>   1660 +-+        : +                                                       |
>        |           +                                                        |
>   1640 +-+------------------------------------------------------------------+
>
>
> [*] bisect-good sample
> [O] bisect-bad  sample
>
>
>
> 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,
> Rong Chen



-- 
Kees Cook




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