linux-kernel - [lkp-robot] [workqueue] f303fccb82: kmsg.workqueue:round-robin_CPU_selection_forced,expect_performance

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Message-ID: <20180520034100.GA20796@yexl-desktop>
Date:   Sun, 20 May 2018 11:41:00 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     linux-kernel@...r.kernel.org, lkp@...org
Subject: [lkp-robot] [workqueue]  f303fccb82:
 kmsg.workqueue:round-robin_CPU_selection_forced,expect_performance_impact


FYI, we noticed the following commit (built with gcc-4.9):

commit: f303fccb82928790ec58eea82722bd5c54d300b3 ("workqueue: implement "workqueue.debug_force_rr_cpu" debug feature")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu Nehalem -smp 2 -m 512M

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


[    0.890976] workqueue: round-robin CPU selection forced, expect performance impact


To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email



Thanks,
Xiaolong

View attachment "config-4.5.0-rc1-00004-gf303fcc" of type "text/plain" (116025 bytes)

View attachment "job-script" of type "text/plain" (4211 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (12048 bytes)