linux-kernel - Re: [Question] Reading /proc/stat has a time backward issue

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Date:   Sun, 14 Aug 2022 02:58:38 +0800
From:   Li Hua <hucool.lihua@...wei.com>
To:     <frederic@...nel.org>
CC:     <bristot@...hat.com>, <bsegall@...gle.com>,
        <dietmar.eggemann@....com>, <hucool.lihua@...wei.com>,
        <juri.lelli@...hat.com>, <linux-kernel@...r.kernel.org>,
        <mgorman@...e.de>, <mingo@...hat.com>, <peterz@...radead.org>,
        <rostedt@...dmis.org>, <vincent.guittot@...aro.org>
Subject: Re: [Question] Reading /proc/stat has a time backward issue

Sorry for not seeing your reply in time

Your patch doesn't seem to fix the problem.  The root cause of the problem is that
the "vtime->utime" and "delta" are temporarily added to the stack and show to the user.

I tried to submit a patch to avoid presenting time backwards to the user. as bellow:
https://lkml.org/lkml/2022/8/12/261

Hope you have better suggestions, thank you for your reply.