linux-kernel - Re: [tip:timers/urgent] Revert: Unify CLOCK_MONOTONIC and CLOCK

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Message-ID: <20180426203811.GA9975@amd>
Date:   Thu, 26 Apr 2018 22:38:11 +0200
From:   Pavel Machek <pavel@....cz>
To:     salyzyn@...roid.com, mingo@...nel.org, peterz@...radead.org,
        john.stultz@...aro.org, hpa@...or.com, mtk.manpages@...il.com,
        prarit@...hat.com, torvalds@...ux-foundation.org,
        rostedt@...dmis.org, kevin@...rana.org, dmitry.torokhov@...il.com,
        pmladek@...e.com, rjw@...ysocki.net, linux-kernel@...r.kernel.org,
        sergey.senozhatsky@...il.com, tglx@...utronix.de, corbet@....net
Cc:     linux-tip-commits@...r.kernel.org
Subject: Re: [tip:timers/urgent] Revert: Unify CLOCK_MONOTONIC and
 CLOCK_BOOTTIME

On Wed 2018-04-25 06:45:50, tip-bot for Thomas Gleixner wrote:
> Commit-ID:  757d5a9b3052a4eebd029f207f1e1df59bef7b7d
> Gitweb:     https://git.kernel.org/tip/757d5a9b3052a4eebd029f207f1e1df59bef7b7d
> Author:     Thomas Gleixner <tglx@...utronix.de>
> AuthorDate: Wed, 25 Apr 2018 15:33:38 +0200
> Committer:  Thomas Gleixner <tglx@...utronix.de>
> CommitDate: Wed, 25 Apr 2018 15:35:08 +0200
> 
> Revert: Unify CLOCK_MONOTONIC and CLOCK_BOOTTIME
> 
> Revert commits
> 
> 92af4dcb4e1c ("tracing: Unify the "boot" and "mono" tracing clocks")
> 127bfa5f4342 ("hrtimer: Unify MONOTONIC and BOOTTIME clock behavior")
> 7250a4047aa6 ("posix-timers: Unify MONOTONIC and BOOTTIME clock behavior")
> d6c7270e913d ("timekeeping: Remove boot time specific code")
> f2d6fdbfd238 ("Input: Evdev - unify MONOTONIC and BOOTTIME clock behavior")
> d6ed449afdb3 ("timekeeping: Make the MONOTONIC clock behave like the BOOTTIME clock")
> 72199320d49d ("timekeeping: Add the new CLOCK_MONOTONIC_ACTIVE clock")
> 
> As stated in the pull request for the unification of CLOCK_MONOTONIC and
> CLOCK_BOOTTIME, it was clear that we might have to revert the change.
> 
> As reported by several folks systemd and other applications rely on the
> documented behaviour of CLOCK_MONOTONIC on Linux and break with the above
> changes. After resume daemons time out and other timeout related issues are
> observed.
> 
> It's sad, that these problems were neither catched in -next nor by those
> folks who expressed interest in this change.
> 
> Reported-by: Rafael J. Wysocki <rjw@...ysocki.net>
> Reported-by: Genki Sky <sky@...ki.is>,

Tested-by: Pavel Machek <pavel@....cz>

Both screensaver problem and network problems are gone on X60 after I
applied the revert. (I did not do too many tests, but it was normally
too easy to reproduce.)

									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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