From: Rob Landley <rob@landley.net>
To: linux-kernel@vger.kernel.org
Cc: Oleg Nesterov <oleg@redhat.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>
Subject: Question about /proc/uptime
Date: Wed, 25 Dec 2013 20:30:09 -0600 [thread overview]
Message-ID: <1388025009.1176.17@driftwood> (raw)
There are two values here, the first is seconds since boot time (which
is just elapsed time; at one point it was ajusted for suspend and that
was revered as confusing).
The second value isn't documented but looking at fs/proc/uptime.c I
think it's idle time? Except, if yo uadd up the idle time from all
processors wouldn't you get 4x the uptime on a 4-way SMP system that's
been idle since boot?
Also, is this actual "cpu was on but not doing anything" time, so
doesn't count suspend as idle? So if you subtract idle from uptime (on
a uniprocessor system) on a system that spent some of its time
suspended, what do you get? Amount of time the system "wasn't idle"
means... Is suspend time idle or not idle?
Confused,
Rob
next reply other threads:[~2013-12-26 2:30 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-26 2:30 Rob Landley [this message]
2013-12-27 14:45 ` Question about /proc/uptime 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
2014-01-01 21:21 ` Rob Landley
2014-01-02 8:28 ` Martin Schwidefsky
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