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[Bug 1013629] 100% CPU usage on kswapd0 only on EC2 HVM
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Mon, 02 Jan 2017 09:45:00 +0000
  • Message-id: <bug-1013629-21960-OrvHFtoz3T@http.bugzilla.suse.com/>
http://bugzilla.suse.com/show_bug.cgi?id=1013629
http://bugzilla.suse.com/show_bug.cgi?id=1013629#c16

Vlastimil Babka <vbabka@xxxxxxxx> changed:

What |Removed |Added
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CC| |vbabka@xxxxxxxx

--- Comment #16 from Vlastimil Babka <vbabka@xxxxxxxx> ---
(In reply to Howard Guo from comment #14)
Of course kswapd was using 100% CPU, consequently a simple cp and `sleep 1`
together would take 2 seconds to complete, which is why the vmstat file
timestamps aren't consecutive.

You could try perf sampling to see where kswapd spends the cpu:

perf record -a -g
(let it run for e.g. a minute, then ctrl^c
perf report -g

Should I disable THP and monitor for its occurrence?

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