linux-kernel - Re: Question about /proc/uptime

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Date:	Wed, 1 Jan 2014 13:41:21 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Rob Landley <rob@...dley.net>
Cc:	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: Question about /proc/uptime

On Tue, 31 Dec 2013 22:17:39 -0600
Rob Landley <rob@...dley.net> wrote:

> On 12/30/13 09:26, Martin Schwidefsky wrote:
> > On Mon, 30 Dec 2013 16:11:10 +0100
> > Oleg Nesterov <oleg@...hat.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.

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