linux-kernel - sar reporting zero cpu usage for everything

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Message-ID: <CAP8WD_YwYbYs-c+DpuuvAT0MiDDt9cRoTChmRSdPG9r_4+oQcA@mail.gmail.com>
Date:   Mon, 30 Apr 2018 16:13:51 -0400
From:   tedheadster <tedheadster@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: sar reporting zero cpu usage for everything

Thomas and Steven,
  I am running the 4.16 kernel and I found some odd behavior in sar.
It shows zero usage time in ALL categories.

12:12:36        CPU     %user     %nice   %system   %iowait    %steal     %idle
12:34:10        all      0.00      0.00      0.00      0.00      0.00      0.00
12:58:04        all      0.00      0.00      0.00      0.00      0.00      0.00
13:06:01        all      0.00      0.00      0.00      0.00      0.00      0.00

This is run every two minutes via cron with '/usr/lib/sa/sa1 30 4 -S DISK'.

You both helped me before with a similar problem, so I thought I would
ask you first for a place to start debugging this.

(apologies, had to be re-sent in text-only mode)

- Matthew Whitehead