linux-kernel - Re: [PATCH] i386 tsc: remove xtime_lock'ing around cpufreq notifier

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Date:	Thu, 12 Apr 2007 10:41:51 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andi Kleen <ak@...ell.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Walker <dwalker@...sta.com>,
	linux-kernel@...r.kernel.org, johnstul@...ibm.com,
	tglx@...utronix.de
Subject: Re: [PATCH] i386 tsc: remove xtime_lock'ing around cpufreq notifier

Andi Kleen wrote:
> Ok. I think it's better to just fix sched_clock() again than to
> add another one.  I can probably
> eliminate the ktime_get() and use something based on jiffies. That will
> be inaccurate for the instable case of course.
>
> I will do that later today.

sched_clock seems a bit weird to use.  In the pv_ops world, it only
counts unstolen time, and it is therefore inherently per-cpu.  The
timestamps should be at least system-wide monotonic.

    J
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