linux-kernel - Re: [PATCH 1/1] v2 add StartTimeMonotomic, StartTimeBootTime to per pid in /proc

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Message-ID: <alpine.DEB.2.02.1402042131380.24986@ionos.tec.linutronix.de>
Date:	Tue, 4 Feb 2014 21:33:20 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dan Ballard <dan@...dstab.net>
cc:	Peter Zijlstra <peterz@...radead.org>,
	Lennart Poettering <lennart@...ttering.net>,
	kay.sievers@...y.org, Rob Landley <rob@...dley.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minto Joseph <mvaliyav@...hat.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mel Gorman <mgorman@...e.de>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] v2 add StartTimeMonotomic, StartTimeBootTime to per
 pid in /proc

On Fri, 31 Jan 2014, Dan Ballard wrote:

> starttime in /proc/$PID/stat is inaccurate by "clock tick" granularity.
> The process starttime is useful for a variety of things, like figuring
> out creation ordering of processes and it is useful to detect PID
> reuses in a somewhat reliable way.
> 
> The kernel internally stores finer granularity values and this patch
> exports them in the easily usable location /prod/$PID/status
> as StartTimeMonotonic and StartTimeBootTime.

If you want proper ordered and granular information use tracing.

Thanks,

	tglx


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