linux-kernel - [lkp-robot] [pids] dd1c1f2f20: will-it-scale.per_process

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Message-ID: <20170905020927.GG13270@yexl-desktop>
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)