linux-kernel - Re: [PATCH] sched_clock: Provide local

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Message-ID: <20100528134233.GA28190@sig21.net>
Date:	Fri, 28 May 2010 15:42:33 +0200
From:	Johannes Stezenbach <js@...21.net>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Divyesh Shah <dpshah@...gle.com>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched_clock: Provide local_clock() and improve
 documentation

On Fri, May 28, 2010 at 03:13:34PM +0200, Peter Zijlstra wrote:
> + * The !IRQ-safetly of sched_clock() and sched_clock_cpu() comes from things

typo                ^

Thank you for adding documentation.  I have one additional
question regarding wrapping of sched_clock().  I know it is
used for timestamps in ftrace and printk, so it's desirable
that it never wraps.  But on several embedded systems
it wraps after a few hours.  Bug or just a minor flaw?
If someone knows it would be nice to get that documented, too.

See also
http://lkml.org/lkml/2010/4/26/340


Johannes
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