Re: [lkp-robot] [fs] 3deb642f0d: will-it-scale.per_process_ops -8.8% regression

Ye Xiaolong
2018-06-26T06:07:19Z

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