linux-kernel - [regression -next0117] What is kcompactd and why is he eating 100% of my cpu?

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Message-ID: <20190126200005.GB27513@amd>
Date:   Sat, 26 Jan 2019 21:00:05 +0100
From:   Pavel Machek <pavel@....cz>
To:     kernel list <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...l.org>
Cc:     mgorman@...hsingularity.net, vbabka@...e.cz, aarcange@...hat.com,
        rientjes@...gle.com, mhocko@...nel.org, zi.yan@...rutgers.edu,
        hannes@...xchg.org
Subject: [regression -next0117] What is kcompactd and why is he eating 100%
 of my cpu?

Hi!

With modern web, 100% CPU load is no longer uncommon, but this time
chromium is not to blame:

pavel@amd:/data/l/linux-next-32$ uname -a
Linux amd 5.0.0-rc2-next-20190117 #214 SMP Fri Jan 18 09:47:18 CET
2019 i686 GNU/Linux

top - 13:38:51 up  1:42, 16 users,  load average: 1.41, 1.93, 1.62
Tasks: 182 total,   3 running, 138 sleeping,   0 stopped,   0 zombie
%Cpu(s):  2.3 us, 57.8 sy,  0.0 ni, 39.9 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem:   3020044 total,  2429420 used,   590624 free,    27468 buffers
KiB Swap:  2097148 total,        0 used,  2097148 free.  1924268 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND     
  608 root      20   0       0      0      0 R  99.6  0.0  11:34.38 kcompactd0  
 9782 root      20   0       0      0      0 I   7.9  0.0   0:59.02 kworker/0:+ 
 2971 root      20   0   46624  23076  13576 S   4.3  0.8   2:50.22 Xorg        



-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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