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Date: Tue, 5 Sep 2017 10:09:27 +0800 From: kernel test robot <xiaolong.ye@...el.com> To: Oleg Nesterov <oleg@...hat.com> Cc: linux-kernel@...r.kernel.org, lkp@...org Subject: [lkp-robot] [pids] dd1c1f2f20: will-it-scale.per_process_ops -5% regression Greeting, We noticed a -5% regression of will-it-scale.per_process_ops due to commit: commit: dd1c1f2f2028a7b851f701fc6a8ebe39dcb95e7c ("pids: make task_tgid_nr_ns() safe") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master in testcase: will-it-scale on test machine: 256 threads Phi with 96G memory with following parameters: nr_task: 100% mode: process test: getppid1 cpufreq_governor: performance test-description: Will It Scale takes a testcase and runs it from 1 through to n parallel copies to see if the testcase will scale. It builds both a process and threads based test in order to see any differences between the two. test-url: https://github.com/antonblanchard/will-it-scale Details are as below: --------------------------------------------------------------------------------------------------> To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml testcase/path_params/tbox_group/run: will-it-scale/100%-process-getppid1-performance/lkp-knl-f1 v4.13-rc6 dd1c1f2f2028a7b851f701fc6a ---------------- -------------------------- 1435181 -5% 1366220 will-it-scale.per_process_ops 1.203e+13 11% 1.333e+13 perf-stat.iTLB-loads 0.11 11% 0.12 perf-stat.ipc 1.194e+13 11% 1.328e+13 perf-stat.instructions 2.342e+12 8% 2.538e+12 perf-stat.branch-instructions 26241 ± 4% -4% 25272 perf-stat.cpu-migrations 2.236e+11 -5% 2.123e+11 perf-stat.branch-misses 8.95 -10% 8.04 perf-stat.cpi 9.55 -12% 8.36 perf-stat.branch-miss-rate% 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, Xiaolong View attachment "config-4.13.0-rc6-00001-gdd1c1f2" of type "text/plain" (106307 bytes) View attachment "job-script" of type "text/plain" (6770 bytes) View attachment "job.yaml" of type "text/plain" (4506 bytes) View attachment "reproduce" of type "text/plain" (292 bytes)
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