linux-kernel - Re: [RFC/RFT patch 0/7] timekeeping: Unify clock MONOTONIC and clock BOOTTIME

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Message-ID: <CAJZ5v0ghbefVcCOFbJFQ_RXwCRZMHQiwkrH55OwyMzBvweFPLg@mail.gmail.com>
Date:   Thu, 26 Apr 2018 11:03:26 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Mike Galbraith <efault@....de>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        John Stultz <john.stultz@...aro.org>, Genki Sky <sky@...ki.is>,
        David Herrmann <dh.herrmann@...il.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Pavel Machek <pavel@....cz>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [RFC/RFT patch 0/7] timekeeping: Unify clock MONOTONIC and clock BOOTTIME

On Thu, Apr 26, 2018 at 10:51 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Thu, 26 Apr 2018, Rafael J. Wysocki wrote:
>
>> On Thu, Apr 26, 2018 at 9:42 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
>> > On Thu, 26 Apr 2018, Mike Galbraith wrote:
>> >> On Wed, 2018-04-25 at 15:03 +0200, Thomas Gleixner wrote:
>> >> > Right, it does not matter. The real interesting one is d6ed449afdb3.
>> >>
>> >> FWIW, three boxen here suspend/resume fine, but repeatably exhibit the
>> >> below after a very few minute suspend, and a short bisect fingered your
>> >> suspect.  Distro is opensuse 42.3.
>> >>
>> >> [  211.113902] Restarting tasks ... done.
>> >> [  211.114817] PM: suspend exit
>> >> [  212.312993] systemd-journald[7266]: File /var/log/journal/016627c3c4784cd4812d4b7e96a34226/system.journal corrupted or uncleanly shut down, renaming and replacing.
>> >> [  212.313363] systemd-coredump[7264]: Detected coredump of the journal daemon itself, diverted to /var/lib/systemd/coredump/core.systemd-journal.0.0aa39276decf4f1ab6fda3464e31f9dd.582.1524720954000000.
>> >>
>> >
>> > Huch, that rather looks like a genuine application bug.
>>
>> Well, say you set a timer to wake you up in X seconds.  When you wake
>> up, you look at a clock and see that Y seconds have passed and Y is
>> much greater than X.  I guess you'd think that something's wrong. :-)
>
> And that makes you coredump, right? Brilliant choice.

That wouldn't be my choice, but some people do make choices like that
even in their personal lives ...