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

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Message-ID: <2607066.J1TAXLeWPN@aspire.rjw.lan>
Date:   Thu, 26 Apr 2018 09:26:52 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Pavel Machek <pavel@....cz>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mark Salyzyn <salyzyn@...roid.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        John Stultz <john.stultz@...aro.org>,
        Peter Anvin <hpa@...or.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Prarit Bhargava <prarit@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Kevin Easton <kevin@...rana.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        SergeySenozhatsky <sergey.senozhatsky@...il.com>,
        Jonathan Corbet <corbet@....net>,
        linux-tip-commits@...r.kernel.org
Subject: Re: [tip:timers/urgent] Revert: Unify CLOCK_MONOTONIC and CLOCK_BOOTTIME

On Thursday, April 26, 2018 9:19:25 AM CEST Pavel Machek wrote:
> Hi!
> 
> > > > For the record, I just run plain F27, obviously with my own kernel
> > > > (and a tweaked config, but it approaches just being a "make
> > > > localmodconfig" of the distro config).
> > > 
> > > So... I do have debian 8.10.
> > 
> > Does that use systemd at all?
> 
> pavel@duo:/data/l/linux$ systemd --version
> systemd 215
> +PAM +AUDIT +SELINUX +IMA +SYSVINIT +LIBCRYPTSETUP +GCRYPT +ACL +XZ
> -SECCOMP -APPARMOR

OK
 
> > > With 4.17-rc1, I get "networking
> > > disabled" message from network manager (and broken network), about
> > > half of the time.

I'm not sure if NM is affected by systemd, though.

> > > But there's more visible symptom: suspend/resume with 4.16, machine is
> > > okay after resume. With 4.17-rc1, just after resume, display starts
> > > dimming and screensaver will kick in. MATE desktop.
> > 
> > Yeah, why not.  It thinks that you've been inactive for the duration of system
> > sleep. :-)
> 
> Well, its rather annoying.

Yes, it is, no question about that.

> "Wake up!" (hitting a key) "OOh, I'm slowly
> waking up.." (few seconds, wakeup is not instant) "and now I'm going
> back to sleep".

I just wanted to say that you could expect that if the clock used by it
was counting over suspend/resume.