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X-MS-Exchange-CrossTenant-UserPrincipalName: euTHiylzNQjZrCAQCwNwXCkXTZyZpG2zb7a0IamNeNkubhV7Ui7x0t4ywHR1GXZZlQMFACUkQ6/3bwYNUAQlAA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR11MB6845 X-OriginatorOrg: intel.com 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: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250421/202504211504.5f3ebfe2-lkp@intel.com ========================================================================================= 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