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

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Date:	Thu, 12 Apr 2007 18:45:39 +0200
From:	Andi Kleen <ak@...ell.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	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


> I was proposing that i386 and x86_64 be given a new, lockless,
> high-resolution printk_clock().  Presently x86 uses the default
> printk_clock(), which uses sched_clock().  Presumably copying the
> pre-x86_64-mm-sched-clock-share.patch version of sched_clock() into
> printk_clock() will suffice.

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.

-Andi



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