From: kernel test robot <yi1.lai@intel.com>
To: Christian Brauner <brauner@kernel.org>
Cc: oe-lkp@lists.linux.dev, lkp@intel.com,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
yi1.lai@intel.com
Subject: [linus:master] [fs] 7eb84d54fa: stress-ng.kvm.ops_per_sec 28.2% regression
Date: Tue, 13 Oct 2026 15:46:13 +0800 [thread overview]
Message-ID: <202610130959.d3ca4cfa-lkp@intel.com> (raw)
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 <yi1.lai@intel.com>
| 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
reply other threads:[~2026-10-13 7:46 UTC|newest]
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