linux-kernel - 5.7-rc0: kswapd eats cpu during a disk test?!

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Message-ID: <20200531103431.GA28429@amd>
Date:   Sun, 31 May 2020 12:34:31 +0200
From:   Pavel Machek <pavel@....cz>
To:     kernel list <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...l.org>
Cc:     mhocko@...e.cz, vbabka@...e.cz
Subject: 5.7-rc0: kswapd eats cpu during a disk test?!

Hi!

This is simple cat /dev/sda > /dev/zero... on thinkpad x60 (x86-32),
with spinning rust.

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+  COMMAND
   1000 root      20   0       0      0      0 R  53.3  0.0  57:34.93  kswapd0
  27897 root      20   0    6976    580    536 R  44.5  0.0   1:44.53  cat

It keeps both CPUs busy... and I don't think that's right.

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

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