linux-kernel - CPU pressure despite low load average

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Message-ID: <d2ec0173-1754-e642-cf66-7bf1a419a36d@molgen.mpg.de>
Date:   Thu, 23 Jul 2020 16:03:19 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: CPU pressure despite low load average

Dear Johannes,


I am wondering, how PSI shows some CPU pressure (on average), while the 
load average, on a four thread system, shows a value well below four.

> $ grep -R . /proc/pressure/
> /proc/pressure/io:some avg10=0.00 avg60=0.00 avg300=0.00 total=941766173
> /proc/pressure/io:full avg10=0.00 avg60=0.00 avg300=0.00 total=818872877
> /proc/pressure/cpu:some avg10=1.24 avg60=1.05 avg300=1.18 total=7522879562
> /proc/pressure/memory:some avg10=0.00 avg60=0.00 avg300=0.00 total=62730674
> /proc/pressure/memory:full avg10=0.00 avg60=0.00 avg300=0.00 total=37176371
> $ uptime
>  15:50:39 up 8 days,  7:17,  1 user,  load average: 0,90, 0,62, 0,60


Kind regards,

Paul