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Date:   Tue, 12 Sep 2023 21:52:39 +0800
From:   kernel test robot <oliver.sang@intel.com>
To:     Mateusz Guzik <mjguzik@gmail.com>
CC:     <oe-lkp@lists.linux.dev>, <lkp@intel.com>,
        <linux-kernel@vger.kernel.org>, Dennis Zhou <dennis@kernel.org>,
        <ying.huang@intel.com>, <feng.tang@intel.com>,
        <fengwei.yin@intel.com>, <oliver.sang@intel.com>
Subject: [linus:master] [kernel/fork]  14ef95be6f:
 phoronix-test-suite.osbench.LaunchPrograms.us_per_event -8.2% improvement
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Hello,

kernel test robot noticed a -8.2% improvement of phoronix-test-suite.osbench.LaunchPrograms.us_per_event on:


commit: 14ef95be6f5558fb9e43aaf06ef9a1d6e0cae6c8 ("kernel/fork: group allocation/free of per-cpu counters for mm struct")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

testcase: phoronix-test-suite
test machine: 96 threads 2 sockets Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz (Cascade Lake) with 512G memory
parameters:

	test: osbench-1.0.2
	option_a: Launch Programs
	cpufreq_governor: performance


Details are as below:
-------------------------------------------------------------------------------------------------->


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20230912/202309122106.b440c4c6-oliver.sang@intel.com

=========================================================================================
compiler/cpufreq_governor/kconfig/option_a/rootfs/tbox_group/test/testcase:
  gcc-12/performance/x86_64-rhel-8.3/Launch Programs/debian-x86_64-phoronix/lkp-csl-2sp7/osbench-1.0.2/phoronix-test-suite

commit: 
  c439d5e8a0 ("pcpcntr: add group allocation/free")
  14ef95be6f ("kernel/fork: group allocation/free of per-cpu counters for mm struct")

c439d5e8a0deb731 14ef95be6f5558fb9e43aaf06ef 
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
      5222 ? 19%     -22.2%       4060 ? 16%  numa-meminfo.node1.Active(anon)
      1.69            +0.1        1.80 ?  2%  turbostat.C1E%
     14072            +4.1%      14642        vmstat.system.cs
      1306 ? 19%     -22.3%       1014 ? 16%  numa-vmstat.node1.nr_active_anon
      1306 ? 19%     -22.3%       1014 ? 16%  numa-vmstat.node1.nr_zone_active_anon
     98.32            -8.2%      90.23        phoronix-test-suite.osbench.LaunchPrograms.us_per_event
   9835435            +8.4%   10659372        phoronix-test-suite.time.minor_page_faults
    314.33            +7.1%     336.67        phoronix-test-suite.time.percent_of_cpu_this_job_got
     83.25            +9.8%      91.44 ?  3%  phoronix-test-suite.time.system_time
    151162            +8.7%     164239        phoronix-test-suite.time.voluntary_context_switches
   9116125            +7.9%    9839611        proc-vmstat.numa_hit
   9115159            +7.7%    9818723        proc-vmstat.numa_local
      8183 ?  5%     -36.5%       5197 ? 70%  proc-vmstat.numa_pages_migrated
   9972768            +7.9%   10764494        proc-vmstat.pgalloc_normal
  10251204            +8.1%   11080823        proc-vmstat.pgfault
   9845664            +8.0%   10637337        proc-vmstat.pgfree
      8183 ?  5%     -36.5%       5197 ? 70%  proc-vmstat.pgmigrate_success
    207326            +7.0%     221825        proc-vmstat.pgreuse
      5.18 ? 13%      -0.9        4.32 ? 19%  perf-profile.calltrace.cycles-pp.do_user_addr_fault.exc_page_fault.asm_exc_page_fault
      9.03 ? 23%      -2.8        6.21 ? 20%  perf-profile.children.cycles-pp.asm_exc_page_fault
      7.18 ? 27%      -2.5        4.70 ? 19%  perf-profile.children.cycles-pp.exc_page_fault
      7.02 ? 27%      -2.4        4.59 ? 17%  perf-profile.children.cycles-pp.do_user_addr_fault
      1.60 ? 11%      -1.1        0.47 ? 75%  perf-profile.children.cycles-pp.wp_page_copy
      0.78 ? 38%      -0.5        0.33 ? 34%  perf-profile.children.cycles-pp.__mmdrop
      0.49 ? 46%      -0.4        0.14 ?111%  perf-profile.children.cycles-pp.wake_up_new_task
      0.76 ? 29%      -0.5        0.21 ? 83%  perf-profile.self.cycles-pp.copy_mc_fragile
      0.10 ?101%      +0.2        0.29 ? 32%  perf-profile.self.cycles-pp.kmem_cache_free_bulk
  19578013 ?  3%      +7.1%   20966194 ?  2%  perf-stat.i.cache-misses
 1.648e+08            +3.3%  1.702e+08        perf-stat.i.cache-references
     14793            +3.9%      15372        perf-stat.i.context-switches
      3.13            +6.0%       3.32 ?  3%  perf-stat.i.cpi
  1.34e+10            +5.1%  1.408e+10        perf-stat.i.cpu-cycles
   2995824 ?  3%      -6.1%    2812561 ?  2%  perf-stat.i.dTLB-load-misses
 2.399e+09            +3.9%  2.493e+09        perf-stat.i.dTLB-loads
 1.255e+09            +3.9%  1.303e+09        perf-stat.i.dTLB-stores
   1908762            +3.4%    1973692        perf-stat.i.iTLB-loads
 9.658e+09            +2.8%  9.931e+09        perf-stat.i.instructions
      0.58            -3.8%       0.56        perf-stat.i.ipc
     22.17 ?  5%     +33.6%      29.63 ?  7%  perf-stat.i.major-faults
      0.14            +5.1%       0.15        perf-stat.i.metric.GHz
     59.57            +3.4%      61.62        perf-stat.i.metric.M/sec
    251853            +6.9%     269294 ?  2%  perf-stat.i.minor-faults
    549142 ?  3%      +9.6%     601791 ?  2%  perf-stat.i.node-loads
    833543            +6.0%     883652 ?  2%  perf-stat.i.node-stores
    251875            +6.9%     269324 ?  2%  perf-stat.i.page-faults
     11.87 ?  2%      +0.4       12.31        perf-stat.overall.cache-miss-rate%
      1.39            +2.2%       1.42        perf-stat.overall.cpi
      0.12 ?  3%      -0.0        0.11 ?  3%  perf-stat.overall.dTLB-load-miss-rate%
      2511            +1.5%       2549        perf-stat.overall.instructions-per-iTLB-miss
      0.72            -2.1%       0.71        perf-stat.overall.ipc
     81.09            -1.4       79.72        perf-stat.overall.node-store-miss-rate%
  19054112 ?  3%      +7.1%   20408724 ?  2%  perf-stat.ps.cache-misses
 1.605e+08            +3.4%  1.658e+08        perf-stat.ps.cache-references
     14397            +3.9%      14963        perf-stat.ps.context-switches
 1.305e+10            +5.1%  1.371e+10        perf-stat.ps.cpu-cycles
   2918655 ?  3%      -6.1%    2741385 ?  2%  perf-stat.ps.dTLB-load-misses
 2.334e+09            +4.0%  2.427e+09        perf-stat.ps.dTLB-loads
 1.221e+09            +3.9%  1.269e+09        perf-stat.ps.dTLB-stores
   1857710            +3.4%    1921204        perf-stat.ps.iTLB-loads
 9.399e+09            +2.8%  9.666e+09        perf-stat.ps.instructions
     21.57 ?  5%     +33.7%      28.83 ?  7%  perf-stat.ps.major-faults
    245071            +6.9%     262088 ?  2%  perf-stat.ps.minor-faults
    534454 ?  2%      +9.6%     585755 ?  2%  perf-stat.ps.node-loads
    811200            +6.0%     860097 ?  2%  perf-stat.ps.node-stores
    245093            +6.9%     262117 ?  2%  perf-stat.ps.page-faults
 3.723e+11            +4.2%  3.878e+11        perf-stat.total.instructions


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.


-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki