Re: [linux-next:master] [mm] 7b32f64bc5: pts.svt-av1.Preset13.Bosphorus4K.frames_per_second 45.8% regression

On Thu 18-06-26 16:00:42, kernel test robot wrote:
> Hello,
> 
> kernel test robot noticed a 45.8% regression of pts.svt-av1.Preset13.Bosphorus4K.frames_per_second on:

This one looks serious enough and real. It would be good to figure out what
happens in this benchmark that it benefits from the readahead across VMA
boundaries so much...

								Honza


> commit: 7b32f64bc512b40b268776c5ac4d354b325b3197 ("mm: limit filemap_fault readahead to VMA boundaries")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
> 
> [still regression on linux-next/master ec039126b7fac4e3af35ebccaa7c6f9b6875ba81]
> 
> testcase: pts
> config: x86_64-rhel-9.4
> compiler: gcc-14
> test machine: 256 threads 2 sockets Intel(R) Xeon(R) 6767P  CPU @ 2.4GHz (Granite Rapids) with 256G memory
> parameters:
> 
> 	test: svt-av1-2.11.1
> 	option_a: 1
> 	option_b: Bosphorus 4K
> 	cpufreq_governor: performance
> 
> 
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <[email protected]>
> | Closes: https://lore.kernel.org/oe-lkp/[email protected]
> 
> 
> Details are as below:
> -------------------------------------------------------------------------------------------------->
> 
> 
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20260618/[email protected]
> 
> =========================================================================================
> compiler/cpufreq_governor/kconfig/option_a/option_b/rootfs/tbox_group/test/testcase:
>   gcc-14/performance/x86_64-rhel-9.4/1/Bosphorus 4K/debian-12-x86_64-phoronix/lkp-gnr-2sp3/svt-av1-2.11.1/pts
> 
> commit: 
>   0b20c36c11 ("mm/madvise: reject invalid process_madvise() advice for zero-length vectors")
>   7b32f64bc5 ("mm: limit filemap_fault readahead to VMA boundaries")
> 
> 0b20c36c118d2122 7b32f64bc512b40b268776c5ac4 
> ---------------- --------------------------- 
>          %stddev     %change         %stddev
>              \          |                \  
>     169.95 ±  6%     -45.8%      92.15 ± 10%  pts.svt-av1.Preset13.Bosphorus4K.frames_per_second
>     220.57 ±  3%    +870.9%       2141        pts.time.major_page_faults
>    5898121            -3.7%    5682645        pts.time.maximum_resident_set_size
>    1408522            -1.3%    1390537        pts.time.minor_page_faults
>     370.43 ±  3%     -12.1%     325.57 ±  6%  pts.time.percent_of_cpu_this_job_got
>     645228 ±  2%      +7.6%     694407 ±  3%  pts.time.voluntary_context_switches
>     162542 ±  7%     +22.4%     198946 ±  8%  sched_debug.cpu.avg_idle.stddev
>     274573 ±  3%      -9.3%     249101 ±  3%  vmstat.io.bi
>  6.779e+09 ±  3%     +11.3%  7.545e+09 ±  4%  cpuidle..time
>    7639156 ±  3%     +10.5%    8439210 ±  3%  cpuidle..usage
>       3.73 ± 39%      -2.2        1.52 ± 52%  perf-profile.calltrace.cycles-pp.pv_native_safe_halt.acpi_safe_halt.acpi_idle_do_entry.acpi_idle_enter.cpuidle_enter_state
>       0.65 ± 87%      +1.8        2.47 ± 60%  perf-profile.children.cycles-pp.link_path_walk
>       0.24 ± 46%     -80.9%       0.05 ±143%  perf-sched.sch_delay.avg.ms.perf_trace_sched_switch.do_wait.kernel_wait4.do_syscall_64.entry_SYSCALL_64_after_hwframe
>       0.65 ± 18%     -33.7%       0.43 ± 17%  perf-sched.wait_and_delay.avg.ms.perf_trace_sched_switch.do_wait.kernel_wait4.do_syscall_64.entry_SYSCALL_64_after_hwframe
>       0.02 ±  7%      +0.0        0.06 ±  8%  mpstat.cpu.all.iowait%
>       1.08 ±  4%      -0.2        0.93 ±  6%  mpstat.cpu.all.usr%
>      22.00 ±  2%     +14.3%      25.14 ±  2%  mpstat.max_utilization.seconds
>      10.00 ±  3%     -40.5%       5.94 ±  2%  mpstat.max_utilization_pct
>    5916248            +6.9%    6324576        meminfo.Active
>    3659476 ±  2%     +11.4%    4078190 ±  2%  meminfo.Active(anon)
>     760816 ±  3%     +16.9%     889730 ±  3%  meminfo.AnonHugePages
>    2263661 ±  4%     +18.5%    2682180 ±  3%  meminfo.AnonPages
>    6611024           +11.9%    7400589 ±  2%  meminfo.Committed_AS
>   11386404            +5.1%   11964152        meminfo.Memused
>      21554            +5.6%      22770 ±  2%  meminfo.PageTables
>     916081 ±  2%     +11.4%    1020691 ±  2%  proc-vmstat.nr_active_anon
>     567129 ±  3%     +18.4%     671694 ±  3%  proc-vmstat.nr_anon_pages
>     370.88 ±  3%     +17.2%     434.57 ±  3%  proc-vmstat.nr_anon_transparent_hugepages
>      48477            +1.6%      49272        proc-vmstat.nr_kernel_stack
>       5399            +5.4%       5691 ±  2%  proc-vmstat.nr_page_table_pages
>     916081 ±  2%     +11.4%    1020691 ±  2%  proc-vmstat.nr_zone_active_anon
>    4614742            -1.5%    4547741        proc-vmstat.pgalloc_normal
>    1667517            -1.0%    1650517        proc-vmstat.pgfault
>    2150014            -2.9%    2087812        proc-vmstat.pgfree
>     224.57 ±  3%    +862.1%       2160        proc-vmstat.pgmajfault
>       1021            -7.2%     948.14        proc-vmstat.thp_fault_alloc
>  2.679e+09 ±  3%      -7.5%  2.477e+09 ±  2%  perf-stat.i.branch-instructions
>       0.80            +0.1        0.86        perf-stat.i.branch-miss-rate%
>   27722463 ±  3%      -8.0%   25498433 ±  2%  perf-stat.i.branch-misses
>   47056892 ±  6%     -11.2%   41804370 ±  6%  perf-stat.i.cache-misses
>     397.43 ±  3%      -7.4%     368.14 ±  2%  perf-stat.i.cpu-migrations
>       0.03 ±  4%      +0.0        0.03 ±  4%  perf-stat.i.dTLB-load-miss-rate%
>    3146082 ±  5%     -13.9%    2707716 ±  5%  perf-stat.i.dTLB-load-misses
>    1739613 ±  5%     -12.5%    1521663 ±  4%  perf-stat.i.dTLB-store-misses
>       9.97 ±  5%    +712.5%      81.01 ±  3%  perf-stat.i.major-faults
>      40.27 ±  4%      -8.2%      36.99 ±  3%  perf-stat.i.metric.M/sec
>      58347 ±  4%     -11.5%      51627 ±  3%  perf-stat.i.minor-faults
>      63.09 ±  6%      -5.8       57.29 ±  8%  perf-stat.i.node-load-miss-rate%
>    6474191 ±  5%     -14.1%    5560267 ±  5%  perf-stat.i.node-loads
>      58356 ±  4%     -11.4%      51708 ±  3%  perf-stat.i.page-faults
>       0.98            -0.0        0.96        perf-stat.overall.branch-miss-rate%
>     435.13 ±  3%     +10.0%     478.43 ±  4%  perf-stat.overall.cycles-between-cache-misses
>       0.06 ±  2%      -0.0        0.06 ±  4%  perf-stat.overall.dTLB-load-miss-rate%
>       0.08 ±  2%      -0.0        0.07 ±  2%  perf-stat.overall.dTLB-store-miss-rate%
>  2.646e+09 ±  3%      -8.7%  2.415e+09 ±  2%  perf-stat.ps.branch-instructions
>   25808992 ±  3%     -10.2%   23188954 ±  2%  perf-stat.ps.branch-misses
>   45057464 ±  5%     -14.4%   38574053 ±  6%  perf-stat.ps.cache-misses
>  1.428e+08 ±  3%      -9.7%  1.289e+08 ±  2%  perf-stat.ps.cache-references
>     367.11 ±  2%      -7.4%     339.78 ±  2%  perf-stat.ps.cpu-migrations
>    2972584 ±  5%     -17.3%    2458144 ±  5%  perf-stat.ps.dTLB-load-misses
>  4.801e+09 ±  3%      -9.2%  4.359e+09 ±  2%  perf-stat.ps.dTLB-loads
>    1715051 ±  5%     -14.7%    1462728 ±  4%  perf-stat.ps.dTLB-store-misses
>  2.193e+09 ±  3%      -9.2%  1.992e+09 ±  2%  perf-stat.ps.dTLB-stores
>   2.06e+10 ±  3%      -9.2%  1.871e+10 ±  2%  perf-stat.ps.instructions
>       8.54 ±  4%    +768.3%      74.19 ±  2%  perf-stat.ps.major-faults
>      59802 ±  3%     -11.0%      53218 ±  3%  perf-stat.ps.minor-faults
>    6145046 ±  4%     -17.9%    5046537 ±  4%  perf-stat.ps.node-loads
>      59810 ±  3%     -10.9%      53292 ±  3%  perf-stat.ps.page-faults
> 
> 
> 
> 
> 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
> 
-- 
Jan Kara <[email protected]>
SUSE Labs, CR