Hello,
kernel test robot noticed a 4.4% improvement of stress-ng.bind-mount.ops_per_sec on:
commit: bf630c40164162ba1d3933c2f5e3397d083e0948 ("vfs: add notifications for mount attach and detach")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
testcase: stress-ng
config: x86_64-rhel-9.4
compiler: gcc-12
test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory
parameters:
nr_threads: 100%
disk: 1HDD
testtime: 60s
fs: ext4
test: bind-mount
cpufreq_governor: performance
Details are as below:
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The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250421/202504211504.5f3ebfe2-lkp@xxxxxxxxx
=========================================================================================
compiler/cpufreq_governor/disk/fs/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime:
gcc-12/performance/1HDD/ext4/x86_64-rhel-9.4/100%/debian-12-x86_64-20240206.cgz/lkp-icl-2sp8/bind-mount/stress-ng/60s
commit:
0f46d81f2b ("fanotify: notify on mount attach and detach")
bf630c4016 ("vfs: add notifications for mount attach and detach")
0f46d81f2bce970b bf630c40164162ba1d3933c2f5e
---------------- ---------------------------
%stddev %change %stddev
\ | \
239.00 ± 5% +12.6% 269.13 ± 6% perf-sched.wait_and_delay.count.__cond_resched.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm
164599 +4.7% 172303 vmstat.system.cs
191335 +2.9% 196836 vmstat.system.in
93378 +3.7% 96874 proc-vmstat.nr_shmem
553581 +2.2% 565891 proc-vmstat.numa_hit
486549 +2.5% 498853 proc-vmstat.numa_local
3679 -3.5% 3549 stress-ng.bind-mount.microsecs_per_mount
1977 -5.8% 1863 stress-ng.bind-mount.microsecs_per_umount
672707 +4.4% 702611 stress-ng.bind-mount.ops
11210 +4.4% 11709 stress-ng.bind-mount.ops_per_sec
393.73 -1.9% 386.40 stress-ng.time.percent_of_cpu_this_job_got
1717204 +5.0% 1803755 stress-ng.time.voluntary_context_switches
2.26e+09 +2.4% 2.315e+09 perf-stat.i.branch-instructions
20796668 +2.3% 21274158 perf-stat.i.branch-misses
170642 +5.0% 179197 perf-stat.i.context-switches
2.14 -2.1% 2.10 perf-stat.i.cpi
1.097e+10 +2.3% 1.122e+10 perf-stat.i.instructions
2.66 +5.0% 2.80 perf-stat.i.metric.K/sec
2.10 -2.1% 2.06 perf-stat.overall.cpi
0.48 +2.1% 0.49 perf-stat.overall.ipc
2.223e+09 +2.4% 2.277e+09 perf-stat.ps.branch-instructions
20458454 +2.3% 20926770 perf-stat.ps.branch-misses
167851 +5.0% 176265 perf-stat.ps.context-switches
1.079e+10 +2.3% 1.104e+10 perf-stat.ps.instructions
6.615e+11 +2.4% 6.771e+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
