Re: [PATCH] sched/cputime: Ensure correct utime and stime proportion

From: Peter Zijlstra
Date: Thu Jul 05 2018 - 06:46:44 EST

On Wed, Jun 27, 2018 at 08:22:42PM +0800, Xunlei Pang wrote:
> tick-based whole utime is utime_0, tick-based whole stime
> is stime_0, scheduler time is rtime_0.

> For a long time, the process runs mainly in userspace with
> run-sleep patterns, and because two different clocks, it
> is possible to have the following condition:
> rtime_0 < utime_0 (as with little stime_0)

I don't follow... what?

Why are you, and why do you think it makes sense to, compare rtime_0
against utime_0 ?

The [us]time_0 are, per your earlier definition, ticks. They're not an
actual measure of time. Do not compare the two, that makes no bloody