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Date:   Tue, 26 Jun 2018 14:03:38 +0800
From:   Ye Xiaolong <xiaolong.ye@intel.com>
To:     Christoph Hellwig <hch@lst.de>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Darrick J. Wong" <darrick.wong@oracle.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>, lkp@01.org,
        viro@zeniv.linux.org.uk
Subject: Re: [lkp-robot] [fs]  3deb642f0d:  will-it-scale.per_process_ops
 -8.8% regression
Message-ID: <20180626060338.GU12146@yexl-desktop>
References: <20180622082752.GX11011@yexl-desktop>
 <20180622150251.GA12802@lst.de>
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Hi,

On 06/22, Christoph Hellwig wrote:
>Hi Xiaolong,
>
>can you retest this workload on the following branch:
>
>    git://git.infradead.org/users/hch/vfs.git remove-get-poll-head
>
>Gitweb:
>
>    http://git.infradead.org/users/hch/vfs.git/shortlog/refs/heads/remove-get-poll-head

Here is the comparison for commit 3deb642f0d and commit 8fbedc1 ("fs: replace f_ops->get_poll_head with a static ->f_poll_head pointer") in remove-get-poll-head branch.

3deb642f0de4c14f  8fbedc19c94fd25a2b9b327015  
----------------  --------------------------  
         %stddev      change         %stddev
             \          |                \  
    457120              -7%     424608        will-it-scale.per_process_ops
    238978                      233862        will-it-scale.per_thread_ops
      1755 ? 13%         8%       1899 ? 18%  will-it-scale.time.voluntary_context_switches
      2332                        2342        will-it-scale.time.system_time
       310                         310        will-it-scale.time.elapsed_time
       310                         310        will-it-scale.time.elapsed_time.max
      4096                        4096        will-it-scale.time.page_size
      0.54                        0.54        will-it-scale.scalability
       807                         806        will-it-scale.time.percent_of_cpu_this_job_got
     17218                       17179        will-it-scale.time.minor_page_faults
      9931                        9862        will-it-scale.time.maximum_resident_set_size
       173              -6%        163        will-it-scale.time.user_time
  49024375              -6%   46155690        will-it-scale.workload
     17818 ? 10%       -19%      14397 ?  4%  will-it-scale.time.involuntary_context_switches
    116842 ? 12%        -4%     112098 ?  5%  interrupts.CAL:Function_call_interrupts
     32735                       32635        vmstat.system.in
      2112 ?  7%       -13%       1845 ?  3%  vmstat.system.cs
       150                         150        turbostat.PkgWatt
       123                         122        turbostat.CorWatt
      1573                        1573        turbostat.Avg_MHz
     15.73              13%      17.77 ? 19%  boot-time.kernel_boot
     15.07              12%      16.93 ? 21%  boot-time.dhcp
       771               8%        834 ? 12%  boot-time.idle
     25.69               8%      27.69 ? 12%  boot-time.boot
      1755 ? 13%         8%       1899 ? 18%  time.voluntary_context_switches
      2332                        2342        time.system_time
       310                         310        time.elapsed_time
       310                         310        time.elapsed_time.max
      4096                        4096        time.page_size
       807                         806        time.percent_of_cpu_this_job_got
     17218                       17179        time.minor_page_faults
      9931                        9862        time.maximum_resident_set_size
       173              -6%        163        time.user_time
     17818 ? 10%       -19%      14397 ?  4%  time.involuntary_context_switches
    428813 ?  9%        57%     672385        proc-vmstat.pgalloc_normal
     41736 ? 15%        22%      50828        proc-vmstat.nr_free_cma
     18116               8%      19506 ?  8%  proc-vmstat.nr_slab_unreclaimable
      1029                        1033        proc-vmstat.nr_page_table_pages
      8453                        8471        proc-vmstat.nr_kernel_stack
      6486                        6499        proc-vmstat.nr_mapped
   3193607                     3194517        proc-vmstat.nr_dirty_threshold
   1594853                     1595308        proc-vmstat.nr_dirty_background_threshold
  16061877                    16064831        proc-vmstat.nr_free_pages
     20009                       20005        proc-vmstat.nr_anon_pages
      6303                        6294        proc-vmstat.numa_other
    799772                      797937        proc-vmstat.pgfault
    667803                      665906        proc-vmstat.pgfree
    666440                      663786        proc-vmstat.numa_hit
    660136                      657491        proc-vmstat.numa_local
    313125                      310062        proc-vmstat.nr_file_pages
      1941 ?  5%                  1917 ?  8%  proc-vmstat.numa_pte_updates
      1448 ?  7%                  1421 ?  9%  proc-vmstat.numa_hint_faults_local
      1596 ?  6%                  1558 ? 10%  proc-vmstat.numa_hint_faults
     12893              -6%      12152 ? 11%  proc-vmstat.nr_slab_reclaimable
     22885            -100%          0        proc-vmstat.nr_indirectly_reclaimable
    245443 ? 16%      -100%          0        proc-vmstat.pgalloc_movable
  19861107 ? 14%        34%   26619357 ? 35%  perf-stat.node-load-misses
  51734389 ?  5%        22%   63014695 ? 25%  perf-stat.node-loads
 1.924e+09 ?  3%        21%   2.32e+09 ?  5%  perf-stat.iTLB-load-misses
 2.342e+09 ?  8%        15%  2.695e+09 ?  4%  perf-stat.cache-references
 3.251e+08 ?  7%        11%  3.622e+08 ?  5%  perf-stat.iTLB-loads
 2.106e+08 ?  4%        10%  2.323e+08 ? 11%  perf-stat.cache-misses
      0.74               7%       0.79        perf-stat.cpi
 1.605e+08 ?  7%         6%  1.703e+08 ?  6%  perf-stat.node-stores
  50804799 ? 16%         5%   53535896 ? 18%  perf-stat.node-store-misses
     27.63 ?  8%         5%      29.07 ?  8%  perf-stat.node-load-miss-rate%
     85.55                       86.49        perf-stat.iTLB-load-miss-rate%
      0.25                        0.25        perf-stat.branch-miss-rate%
    778741                      776946        perf-stat.minor-faults
    778753                      776948        perf-stat.page-faults
     23.93 ?  9%                 23.75 ? 12%  perf-stat.node-store-miss-rate%
      9117 ?  4%                  8969 ?  4%  perf-stat.cpu-migrations
  1.59e+13              -4%  1.533e+13        perf-stat.cpu-cycles
    439328 ?  3%        -5%     419250 ?  5%  perf-stat.path-length
      9.05 ?  8%        -5%       8.62 ?  9%  perf-stat.cache-miss-rate%
      0.44 ? 39%        -6%       0.42 ? 31%  perf-stat.dTLB-load-miss-rate%
      1.35              -7%       1.26        perf-stat.ipc
 3.294e+12 ?  3%        -9%  2.988e+12 ?  3%  perf-stat.dTLB-stores
 5.451e+12 ?  4%       -10%  4.905e+12 ?  4%  perf-stat.dTLB-loads
 4.667e+12 ?  3%       -10%  4.195e+12 ?  4%  perf-stat.branch-instructions
 2.154e+13 ?  3%       -10%  1.935e+13 ?  4%  perf-stat.instructions
 1.161e+10 ?  4%       -10%  1.043e+10 ?  5%  perf-stat.branch-misses
 2.401e+10 ? 34%       -13%  2.093e+10 ? 36%  perf-stat.dTLB-load-misses
    653927 ?  8%       -13%     568299 ?  3%  perf-stat.context-switches
     11203 ?  4%       -26%       8344        perf-stat.instructions-per-iTLB-miss
      0.02 ? 41%       -50%       0.01 ? 47%  perf-stat.dTLB-store-miss-rate%
 7.557e+08 ? 37%       -53%  3.521e+08 ? 49%  perf-stat.dTLB-store-misses

Thanks,
Xiaolong