From: Martin Schwidefsky <schwidefsky@de.ibm.com>
To: Rob Landley <rob@landley.net>
Cc: Oleg Nesterov <oleg@redhat.com>,
linux-kernel@vger.kernel.org,
Frederic Weisbecker <fweisbec@gmail.com>
Subject: Re: Question about /proc/uptime
Date: Wed, 1 Jan 2014 13:41:21 +0100 [thread overview]
Message-ID: <20140101134121.79787caf@mschwide> (raw)
In-Reply-To: <52C396E3.5080000@landley.net>
On Tue, 31 Dec 2013 22:17:39 -0600
Rob Landley <rob@landley.net> wrote:
> On 12/30/13 09:26, Martin Schwidefsky wrote:
> > On Mon, 30 Dec 2013 16:11:10 +0100
> > Oleg Nesterov <oleg@redhat.com> wrote:
> >> Not sure I understand... except that timekeeping_resume() does
> >> __timekeeping_inject_sleeptime().
> >
> > Hmm, you are right. The sleeptime is added to the monotonic boottime.
> > So the first value of /proc/uptime is the wall-time since boot.
> > And the second value is combined idle time over all cpus.
>
> Is there an obvious way to query the non-suspend uptime from userspace?
clock_gettime with CLOCK_MONOTONIC gives you the uptime minus without the
suspend time.
--
blue skies,
Martin.
"Reality continues to ruin my life." - Calvin.
next prev parent reply other threads:[~2014-01-01 12:41 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-26 2:30 Question about /proc/uptime Rob Landley
2013-12-27 14:45 ` Oleg Nesterov
2013-12-30 8:56 ` Martin Schwidefsky
2013-12-30 15:11 ` Oleg Nesterov
2013-12-30 15:26 ` Martin Schwidefsky
2014-01-01 4:17 ` Rob Landley
2014-01-01 12:41 ` Martin Schwidefsky [this message]
2014-01-01 21:21 ` Rob Landley
2014-01-02 8:28 ` Martin Schwidefsky
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