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Date:   Mon, 4 Dec 2017 09:52:31 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp-robot] [mm]  6f12c591f0:  vm-scalability.throughput -3.8%
 regression


Greeting,

FYI, we noticed a -3.8% regression of vm-scalability.throughput due to commit:


commit: 6f12c591f0ac4a63bb7f451c0bbb5f4c81a81147 ("mm: memcontrol: fix excessive complexity in memory.stat reporting")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: vm-scalability
on test machine: 128 threads 4 Sockets Haswell-EP with 512G memory
with following parameters:

	runtime: 300s
	size: 1T
	test: lru-shm
	cpufreq_governor: performance

test-description: The motivation behind this suite is to exercise functions and regions of the mm/ of the Linux kernel which are of interest to us.
test-url: https://git.kernel.org/cgit/linux/kernel/git/wfg/vm-scalability.git/

In addition to that, the commit also has significant impact on the following tests:

+------------------+----------------------------------------------------------------------+
| testcase: change | will-it-scale: will-it-scale.per_process_ops -4.6% regression        |
| test machine     | 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 64G memory |
| test parameters  | cpufreq_governor=performance                                         |
|                  | mode=process                                                         |
|                  | nr_task=50%                                                          |
|                  | test=page_fault3                                                     |
+------------------+----------------------------------------------------------------------+


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/rootfs/runtime/size/tbox_group/test/testcase:
  gcc-7/performance/x86_64-rhel-7.2/debian-x86_64-2016-08-31.cgz/300s/1T/lkp-hsw-4ep1/lru-shm/vm-scalability

commit: 
  0b6db939a1 ("mm: memcontrol: implement lruvec stat functions on top of each other")
  6f12c591f0 ("mm: memcontrol: fix excessive complexity in memory.stat reporting")

0b6db939a1a57c03 6f12c591f0ac4a63bb7f451c0b 
---------------- -------------------------- 
         %stddev     %change         %stddev
             \          |                \  
      1.49           +33.8%       2.00        vm-scalability.free_time
     37303            -3.6%      35960        vm-scalability.median
   4844237            -3.8%    4659025        vm-scalability.throughput
    125155 ±  3%      +8.5%     135756 ±  3%  vm-scalability.time.involuntary_context_switches
      6782            +3.2%       7000        vm-scalability.time.percent_of_cpu_this_job_got
      2643           +36.3%       3602 ±  4%  vm-scalability.time.user_time
 1.587e+08 ±  9%     -22.3%  1.234e+08 ±  5%  cpuidle.POLL.time
      6.09            +2.0        8.10 ±  3%  mpstat.cpu.usr%
    858297           +21.7%    1044527        softirqs.RCU
    675.00            +2.4%     691.00        turbostat.Avg_MHz
      4688 ±  2%     +35.7%       6362 ±  7%  vmstat.system.cs
 1.787e+09            +3.1%  1.842e+09        perf-stat.cache-misses
   1619987 ±  2%     +37.6%    2229517 ±  7%  perf-stat.context-switches
      6.04            +4.7%       6.33        perf-stat.cpi
 2.983e+13            +3.9%    3.1e+13        perf-stat.cpu-cycles
     47218            +6.3%      50207        perf-stat.cpu-migrations
     74.29            -1.7       72.63        perf-stat.iTLB-load-miss-rate%
 2.543e+08            -8.1%  2.337e+08        perf-stat.iTLB-load-misses
     19419            +8.0%      20974        perf-stat.instructions-per-iTLB-miss
      0.17            -4.5%       0.16        perf-stat.ipc
 4.962e+08 ±  2%      +9.7%  5.441e+08 ±  3%  perf-stat.node-load-misses
      7.65 ±  2%      +3.4       11.00 ±  2%  perf-stat.node-store-miss-rate%
  75787197 ±  2%     +47.5%  1.118e+08 ±  2%  perf-stat.node-store-misses
 9.154e+08            -1.3%  9.039e+08        perf-stat.node-stores
     75077           +20.9%      90786 ±  8%  sched_debug.cfs_rq:/.exec_clock.avg
     84968           +23.0%     104516 ± 10%  sched_debug.cfs_rq:/.exec_clock.max
     65257           +24.3%      81120 ±  7%  sched_debug.cfs_rq:/.exec_clock.min
  10207581           +21.4%   12395197 ±  8%  sched_debug.cfs_rq:/.min_vruntime.avg
  10783232           +21.3%   13075917 ±  8%  sched_debug.cfs_rq:/.min_vruntime.max
   7641468 ±  4%     +21.1%    9254043 ±  8%  sched_debug.cfs_rq:/.min_vruntime.min
      8.15 ±  2%     +22.2%       9.95 ±  8%  sched_debug.cfs_rq:/.nr_spread_over.avg
      5.86 ±  6%     +16.4%       6.82 ±  4%  sched_debug.cfs_rq:/.nr_spread_over.stddev
  -1214677           +58.7%   -1927998        sched_debug.cfs_rq:/.spread0.min
     92184           +18.6%     109345 ±  8%  sched_debug.cpu.nr_load_updates.avg
    115923 ±  2%     +17.7%     136412 ±  6%  sched_debug.cpu.nr_load_updates.max
      5680 ±  2%     +50.7%       8559 ±  7%  sched_debug.cpu.nr_switches.avg
      1063 ±  4%     +12.4%       1195 ±  4%  sched_debug.cpu.nr_switches.min
     12017 ± 12%     +49.1%      17913 ±  6%  sched_debug.cpu.nr_switches.stddev
      4822 ±  3%     +60.1%       7719 ±  8%  sched_debug.cpu.sched_count.avg
    624.35 ±  9%     +29.9%     811.18 ± 11%  sched_debug.cpu.sched_count.min
     11704 ± 13%     +50.8%      17646 ±  7%  sched_debug.cpu.sched_count.stddev
    787.60 ±  5%     +18.5%     933.11 ± 13%  sched_debug.cpu.sched_goidle.stddev
      2222 ±  3%     +63.7%       3637 ±  8%  sched_debug.cpu.ttwu_count.avg
    197.45 ±  2%     +14.1%     225.33 ±  5%  sched_debug.cpu.ttwu_count.min
      5988 ± 12%     +47.7%       8846 ±  7%  sched_debug.cpu.ttwu_count.stddev
      1857 ±  4%     +71.5%       3185 ±  8%  sched_debug.cpu.ttwu_local.avg
    134.85           +17.1%     157.92 ±  7%  sched_debug.cpu.ttwu_local.min
      5806 ± 14%     +50.0%       8708 ±  8%  sched_debug.cpu.ttwu_local.stddev
     44.45            -2.6       41.86        perf-profile.calltrace.cycles-pp.clear_page_erms.shmem_getpage_gfp.shmem_fault.__do_fault.__handle_mm_fault
     83.65            -2.5       81.12        perf-profile.calltrace.cycles-pp.__do_fault.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault
     83.64            -2.5       81.10        perf-profile.calltrace.cycles-pp.shmem_fault.__do_fault.__handle_mm_fault.handle_mm_fault.__do_page_fault
     82.93            -2.5       80.47        perf-profile.calltrace.cycles-pp.shmem_getpage_gfp.shmem_fault.__do_fault.__handle_mm_fault.handle_mm_fault
     89.34            -0.7       88.62        perf-profile.calltrace.cycles-pp.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
     92.33            -0.2       92.16        perf-profile.calltrace.cycles-pp.page_fault
     89.62            -0.1       89.48        perf-profile.calltrace.cycles-pp.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
     92.05            -0.1       91.93        perf-profile.calltrace.cycles-pp.do_page_fault.page_fault
     92.05            -0.1       91.93        perf-profile.calltrace.cycles-pp.__do_page_fault.do_page_fault.page_fault
      6.68            -0.0        6.68        perf-profile.calltrace.cycles-pp.get_page_from_freelist.__alloc_pages_nodemask.alloc_pages_vma.shmem_alloc_page.shmem_alloc_and_acct_page
      7.16            +0.2        7.32        perf-profile.calltrace.cycles-pp.shmem_alloc_page.shmem_alloc_and_acct_page.shmem_getpage_gfp.shmem_fault.__do_fault
      7.03            +0.2        7.20        perf-profile.calltrace.cycles-pp.alloc_pages_vma.shmem_alloc_page.shmem_alloc_and_acct_page.shmem_getpage_gfp.shmem_fault
      6.86            +0.2        7.03        perf-profile.calltrace.cycles-pp.__alloc_pages_nodemask.alloc_pages_vma.shmem_alloc_page.shmem_alloc_and_acct_page.shmem_getpage_gfp
      9.64 ±  2%      +0.2        9.84 ±  2%  perf-profile.calltrace.cycles-pp.shmem_alloc_and_acct_page.shmem_getpage_gfp.shmem_fault.__do_fault.__handle_mm_fault
     47.05            -3.1       43.95        perf-profile.children.cycles-pp.clear_page_erms
     83.65            -2.5       81.11        perf-profile.children.cycles-pp.shmem_fault
     83.66            -2.5       81.13        perf-profile.children.cycles-pp.__do_fault
     83.18            -2.5       80.67        perf-profile.children.cycles-pp.shmem_getpage_gfp
     89.42            -0.7       88.70        perf-profile.children.cycles-pp.__handle_mm_fault
     92.38            -0.2       92.20        perf-profile.children.cycles-pp.page_fault
     89.68            -0.1       89.56        perf-profile.children.cycles-pp.handle_mm_fault
     92.13            -0.1       92.01        perf-profile.children.cycles-pp.__do_page_fault
     92.12            -0.1       92.00        perf-profile.children.cycles-pp.do_page_fault
      7.12            +0.0        7.15        perf-profile.children.cycles-pp.get_page_from_freelist
      7.18            +0.1        7.33        perf-profile.children.cycles-pp.shmem_alloc_page
      7.07            +0.2        7.24        perf-profile.children.cycles-pp.alloc_pages_vma
      7.08            +0.2        7.26        perf-profile.children.cycles-pp.__alloc_pages_nodemask
      9.66 ±  2%      +0.2        9.86 ±  2%  perf-profile.children.cycles-pp.shmem_alloc_and_acct_page
     45.60            -2.6       42.96        perf-profile.self.cycles-pp.clear_page_erms
     23.38            -1.4       22.01 ±  2%  perf-profile.self.cycles-pp.shmem_getpage_gfp


                                                                                
                               vm-scalability.throughput                        
                                                                                
  4.9e+06 +-+---------------------------------------------------------------+   
          |.++. .++   +. :+ .+  +  : +.++.+.+. +.+.++.+. +.+. +.+.+. +.+. +.|   
  4.8e+06 +-+  +   + +  +  +  :+ +:           +         +    +      +    +  |   
          |         +         +   +                                         |   
  4.7e+06 +-+                          O  O                                 |   
          |           O OO O OO                                             |   
  4.6e+06 +-+                   O O     O   O                               |   
          |                                                                 |   
  4.5e+06 +-+                                                               |   
          O  O O O                                                          |   
  4.4e+06 +-O     O O                                                       |   
          |                          O                                      |   
  4.3e+06 +-+                      O                                        |   
          |                                                                 |   
  4.2e+06 +-+---------------------------------------------------------------+   
                                                                                
                                                                                                                                                                
                             vm-scalability.free_time                           
                                                                                
  2.4 +-+-------------------------------------------------------------------+   
  2.3 +-+                        O                                          |   
      |    O                                                                |   
  2.2 +-O    O                                                              |   
  2.1 +-+      O O                 O                                        |   
    2 O-+           O O   O O  O     OO O O                                 |   
  1.9 +-+ O        O    O    O                                              |   
      |                                                                     |   
  1.8 +-+                                                                   |   
  1.7 +-+                                                                   |   
  1.6 +-+                                                         .+.       |   
  1.5 +-+.+   .+.           +            .+.  .+.   .+   .+. .+ .+   +.+    |   
      |.+  +.+   +.++.+.+. + +.+. .+.++.+   ++   +.+  +.+   +  +        +.+.|   
  1.4 +-+                 +      +                                          |   
  1.3 +-+-------------------------------------------------------------------+   
                                                                                
                                                                                                                                                                
                              perf-stat.node-store-misses                       
                                                                                
   1.2e+08 +-+--------------------------------------------------------------+   
  1.15e+08 +-+                           O                                  |   
           O    O         O    O OO O O     O                               |   
   1.1e+08 +-OO   OO O OO   OO         O   O                                |   
  1.05e+08 +-+                                                              |   
     1e+08 +-+                                                              |   
   9.5e+07 +-+                                                              |   
           |                                                                |   
     9e+07 +-+                                                              |   
   8.5e+07 +-+                                                              |   
     8e+07 +-+     +.   +.+.    .+ .+.++. .+     +. .+     +.     +.++.   + |   
   7.5e+07 +-+:.+.+  +.+    ++.+  +      +  :.+.+  +  :.+.+  +.  :     +. :+|   
           |  +                             +         +        + :       +  |   
     7e+07 +-+                                                  +           |   
   6.5e+07 +-+--------------------------------------------------------------+   
                                                                                
                                                                                                                                                                
                          perf-stat.node-store-miss-rate_                       
                                                                                
  11.5 +-+-------------------------O---O------------------------------------+   
    11 O-+  O   O  O   O O  O O O O       O                                 |   
       |   O  O   O  O    O          O   O                                  |   
  10.5 +-O                                                                  |   
    10 +-+                                                                  |   
       |                                                                    |   
   9.5 +-+                                                                  |   
     9 +-+                                                                  |   
   8.5 +-+                                                                  |   
       |                                                                    |   
     8 +-+            .+      +    +.                      .+.   +.+.+.  .+.|   
   7.5 +-+.  .+.+. +.+  +    : + .+  +.+.+   .+.++.+.   .++   +. :     ++   |   
       |   ++     +      ++. :  +         +.+        +.+        +           |   
     7 +-+                  +                                               |   
   6.5 +-+------------------------------------------------------------------+   
                                                                                
                                                                                
[*] bisect-good sample
[O] bisect-bad  sample

***************************************************************************************************
lkp-bdw-ep3d: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 64G memory
=========================================================================================
compiler/cpufreq_governor/kconfig/mode/nr_task/rootfs/tbox_group/test/testcase:
  gcc-7/performance/x86_64-rhel-7.2/process/50%/debian-x86_64-2016-08-31.cgz/lkp-bdw-ep3d/page_fault3/will-it-scale

commit: 
  0b6db939a1 ("mm: memcontrol: implement lruvec stat functions on top of each other")
  6f12c591f0 ("mm: memcontrol: fix excessive complexity in memory.stat reporting")

0b6db939a1a57c03 6f12c591f0ac4a63bb7f451c0b 
---------------- -------------------------- 
         %stddev     %change         %stddev
             \          |                \  
   1212116            -4.6%    1156875        will-it-scale.per_process_ops
    233916 ±  2%     -12.9%     203708 ± 13%  meminfo.DirectMap4k
     28669 ±  4%      +7.4%      30788 ±  3%  turbostat.C1E
    106544           +21.9%     129864 ±  9%  turbostat.C3
  32957756 ±  5%     +59.2%   52463265 ± 25%  cpuidle.C3.time
    106823           +21.8%     130151 ±  9%  cpuidle.C3.usage
 2.258e+08 ±  5%     +26.8%  2.863e+08 ± 16%  cpuidle.POLL.time
      0.02            +0.0        0.06 ±  4%  perf-stat.branch-miss-rate%
 1.607e+09          +142.4%  3.896e+09 ±  3%  perf-stat.branch-misses
     26.96            -4.2       22.77        perf-stat.cache-miss-rate%
 9.147e+10           +21.2%  1.108e+11        perf-stat.cache-references
      1.09            +3.1%       1.13        perf-stat.cpi
 9.904e+12            -4.0%  9.512e+12        perf-stat.dTLB-loads
 3.669e+11            -4.6%  3.502e+11        perf-stat.dTLB-store-misses
 5.412e+12            -3.8%  5.204e+12        perf-stat.dTLB-stores
     52.18            -1.8       50.36 ±  2%  perf-stat.iTLB-load-miss-rate%
      0.91            -3.0%       0.89        perf-stat.ipc
 1.604e+10            -4.6%  1.531e+10        perf-stat.minor-faults
      8.27 ±  2%      -0.8        7.43 ±  2%  perf-stat.node-load-miss-rate%
 1.013e+08           +18.1%  1.196e+08 ±  2%  perf-stat.node-load-misses
 1.124e+09 ±  2%     +32.6%   1.49e+09        perf-stat.node-loads
      1.00            +4.1        5.11        perf-stat.node-store-miss-rate%
 1.631e+08          +398.2%  8.125e+08 ±  3%  perf-stat.node-store-misses
 1.613e+10            -6.4%   1.51e+10 ±  3%  perf-stat.node-stores
 1.604e+10            -4.6%  1.531e+10        perf-stat.page-faults
     14.34            -0.8       13.56        perf-profile.calltrace.cycles-pp.native_irq_return_iret
     36.78            -0.5       36.24        perf-profile.calltrace.cycles-pp.intel_idle.cpuidle_enter_state.do_idle.cpu_startup_entry.start_secondary
     38.03            -0.4       37.66        perf-profile.calltrace.cycles-pp.secondary_startup_64
     37.18            -0.4       36.82        perf-profile.calltrace.cycles-pp.cpu_startup_entry.start_secondary.secondary_startup_64
     37.18            -0.4       36.82        perf-profile.calltrace.cycles-pp.do_idle.cpu_startup_entry.start_secondary.secondary_startup_64
     37.18            -0.4       36.82        perf-profile.calltrace.cycles-pp.start_secondary.secondary_startup_64
     37.18            -0.4       36.82        perf-profile.calltrace.cycles-pp.cpuidle_enter_state.do_idle.cpu_startup_entry.start_secondary.secondary_startup_64
      9.87            -0.2        9.66        perf-profile.calltrace.cycles-pp.shmem_fault.__do_fault.__handle_mm_fault.handle_mm_fault.__do_page_fault
     10.01            -0.2        9.81        perf-profile.calltrace.cycles-pp.__do_fault.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault
      9.36            -0.2        9.18        perf-profile.calltrace.cycles-pp.shmem_getpage_gfp.shmem_fault.__do_fault.__handle_mm_fault.handle_mm_fault
      8.66            -0.1        8.52        perf-profile.calltrace.cycles-pp.find_lock_entry.shmem_getpage_gfp.shmem_fault.__do_fault.__handle_mm_fault
      5.82            +0.0        5.82        perf-profile.calltrace.cycles-pp.find_get_entry.find_lock_entry.shmem_getpage_gfp.shmem_fault.__do_fault
      6.94            +0.7        7.62        perf-profile.calltrace.cycles-pp.unmap_region.do_munmap.vm_munmap.sys_munmap.entry_SYSCALL_64_fastpath
      6.96            +0.7        7.64        perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_fastpath
      6.94            +0.7        7.62        perf-profile.calltrace.cycles-pp.sys_munmap.entry_SYSCALL_64_fastpath
      6.94            +0.7        7.62        perf-profile.calltrace.cycles-pp.vm_munmap.sys_munmap.entry_SYSCALL_64_fastpath
      6.94            +0.7        7.62        perf-profile.calltrace.cycles-pp.do_munmap.vm_munmap.sys_munmap.entry_SYSCALL_64_fastpath
      6.92            +0.7        7.60        perf-profile.calltrace.cycles-pp.unmap_page_range.unmap_vmas.unmap_region.do_munmap.vm_munmap
      6.92            +0.7        7.60        perf-profile.calltrace.cycles-pp.unmap_vmas.unmap_region.do_munmap.vm_munmap.sys_munmap
     34.31            +0.7       35.04        perf-profile.calltrace.cycles-pp.page_fault
     32.71            +0.8       33.55        perf-profile.calltrace.cycles-pp.do_page_fault.page_fault
     32.61            +0.8       33.46        perf-profile.calltrace.cycles-pp.__do_page_fault.do_page_fault.page_fault
     22.08            +1.1       23.14        perf-profile.calltrace.cycles-pp.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
     23.74            +1.5       25.26        perf-profile.calltrace.cycles-pp.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
      4.63            +2.3        6.89        perf-profile.calltrace.cycles-pp.finish_fault.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault
      4.37            +2.3        6.66        perf-profile.calltrace.cycles-pp.alloc_set_pte.finish_fault.__handle_mm_fault.handle_mm_fault.__do_page_fault
     14.34            -0.8       13.56        perf-profile.children.cycles-pp.native_irq_return_iret
     37.63            -0.5       37.08        perf-profile.children.cycles-pp.intel_idle
     38.03            -0.4       37.66        perf-profile.children.cycles-pp.secondary_startup_64
     38.03            -0.4       37.66        perf-profile.children.cycles-pp.cpu_startup_entry
     38.03            -0.4       37.66        perf-profile.children.cycles-pp.do_idle
     38.03            -0.4       37.66        perf-profile.children.cycles-pp.cpuidle_enter_state
     37.18            -0.4       36.82        perf-profile.children.cycles-pp.start_secondary
     10.09            -0.2        9.89        perf-profile.children.cycles-pp.shmem_fault
     10.15            -0.2        9.95        perf-profile.children.cycles-pp.__do_fault
      9.58            -0.2        9.39        perf-profile.children.cycles-pp.shmem_getpage_gfp
      8.89            -0.2        8.74        perf-profile.children.cycles-pp.find_lock_entry
      5.95            -0.0        5.95        perf-profile.children.cycles-pp.find_get_entry
      7.06            +0.6        7.70        perf-profile.children.cycles-pp.unmap_page_range
      6.98            +0.7        7.66        perf-profile.children.cycles-pp.entry_SYSCALL_64_fastpath
      6.95            +0.7        7.62        perf-profile.children.cycles-pp.sys_munmap
      6.95            +0.7        7.62        perf-profile.children.cycles-pp.vm_munmap
      6.95            +0.7        7.62        perf-profile.children.cycles-pp.do_munmap
      6.93            +0.7        7.60        perf-profile.children.cycles-pp.unmap_vmas
      6.95            +0.7        7.62        perf-profile.children.cycles-pp.unmap_region
     34.31            +0.7       35.05        perf-profile.children.cycles-pp.page_fault
     32.99            +0.8       33.81        perf-profile.children.cycles-pp.do_page_fault
     33.15            +0.8       33.98        perf-profile.children.cycles-pp.__do_page_fault
     22.28            +1.1       23.36        perf-profile.children.cycles-pp.__handle_mm_fault
     23.97            +1.5       25.48        perf-profile.children.cycles-pp.handle_mm_fault
      4.69            +2.3        6.97        perf-profile.children.cycles-pp.finish_fault
      4.57            +2.4        6.93        perf-profile.children.cycles-pp.alloc_set_pte
     14.34            -0.8       13.56        perf-profile.self.cycles-pp.native_irq_return_iret
     37.63            -0.5       37.08        perf-profile.self.cycles-pp.intel_idle





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,
Xiaolong

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