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charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit Hello, kernel test robot noticed a 28.2% regression of stress-ng.kvm.ops_per_sec on: commit: 7eb84d54fac5002bd975d1de8fd61d57e89172ab ("fs: don't let a migrating task hide its reference from do_umount()") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master testcase: stress-ng config: x86_64-rhel-9.4 compiler: gcc-14 test machine: 192 threads 2 sockets Intel(R) Xeon(R) 6740E CPU @ 2.4GHz (Sierra Forest) with 256G memory parameters: nr_threads: 100% testtime: 60s test: kvm 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 | Closes: https://lore.kernel.org/oe-lkp/202610130959.d3ca4cfa-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20261013/202610130959.d3ca4cfa-lkp@intel.com ========================================================================================= compiler/cpufreq_governor/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime: gcc-14/performance/x86_64-rhel-9.4/100%/debian-13-x86_64-20250902.cgz/lkp-srf-2sp2/kvm/stress-ng/60s commit: bba9960c07 ("selftests/filesystems: check that a busy propagated copy blocks a synchronous umount") 7eb84d54fa ("fs: don't let a migrating task hide its reference from do_umount()") bba9960c073dbea8 7eb84d54fac5002bd975d1de8fd ---------------- --------------------------- %stddev %change %stddev \ | \ 134749 -28.2% 96786 ± 2% stress-ng.kvm.ops 2245 -28.2% 1612 ± 2% stress-ng.kvm.ops_per_sec 571737 -25.3% 427284 ± 3% stress-ng.time.minor_page_faults 7905 ± 3% +35.2% 10690 ± 6% stress-ng.time.percent_of_cpu_this_job_got 4566 ± 3% +37.9% 6297 ± 6% stress-ng.time.system_time 190.93 -28.1% 137.21 ± 2% stress-ng.time.user_time 698896 -24.8% 525918 stress-ng.time.voluntary_context_switches 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