FYI, we noticed the below changes on commit 6098b45b32e6baeacc04790773ced9340601d511 ("aio: block exit_aio() until all context requests are completed") testbox/testcase/testparams: vm-vp-2G/xfstests/4HDD-btrfs-generic-quick 2ff396be602f10b5 6098b45b32e6baeacc04790773 ---------------- -------------------------- %stddev %change %stddev \ | \ 26352 ± 9% -13.6% 22774 ± 1% vmstat.system.cs 10342 ± 6% -12.3% 9066 ± 0% vmstat.system.in 37 ± 4% -12.1% 32 ± 3% time.percent_of_cpu_this_job_got 1197 ± 2% -14.2% 1028 ± 0% vmstat.io.bi 18470 ± 2% -10.1% 16609 ± 1% vmstat.io.bo 157 ± 3% +13.7% 179 ± 0% time.elapsed_time vm-vp-2G: qemu-system-x86_64 -enable-kvm -cpu Penryn Memory: 2G xfstests.generic.239.seconds 30 ++-----------O---------------------------------------------------------+ | O O O O | 25 ++ O | | O O O O O O O O O O O O | | O | 20 O+ | | | 15 ++ | | | 10 ++ | | | | | 5 ++ | | | 0 *+-*-*--*-*--*-*--*-*--*-*--*-*--*--*-*--*-*--*-*--*-*--*-*--*-*--*-*--* [*] bisect-good sample [O] bisect-bad sample To reproduce: apt-get install ruby ruby-oj git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/setup-local job.yaml # the job file attached in this email bin/run-local job.yaml 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. Thanks, Fengguang _______________________________________________ LKP mailing list LKP(a)linux.intel.com