linux-kernel - can the idle value of /proc/stat decrease?

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Date:   Mon, 28 Dec 2020 15:54:12 +0800
From:   "xuqiang (M)" <xuqiang36@...wei.com>
To:     <adobriyan@...il.com>, <christian.brauner@...ntu.com>,
        <michael.weiss@...ec.fraunhofer.de>, <sfr@...b.auug.org.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>
CC:     <rui.xiang@...wei.com>
Subject: can the idle value of /proc/stat decrease?

Our recent test shows that the idle value of /proc/stat can decrease.
Is this an unreported bug? or it has been reported and the solution is 
waiting to get merged.

The results of the two readings from /proc/stat are shown as below, the 
interval between the two readings is 150 ms:

cat /proc/stat
cpu0 5536 10 14160 4118960 0 0 227128 0 0 0

cat /proc/stat
cpu0 5536 10 14160 4118959 0 0 227143 0 0 0