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Message-Id: <1219823233.6462.38.camel@twins>
Date: Wed, 27 Aug 2008 09:47:13 +0200
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
To: Ingo Molnar <mingo@...e.hu>
Cc: Yinghai Lu <yhlu.kernel@...il.com>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: printk_time to use tsc before cpu_clock is ready
On Wed, 2008-08-27 at 09:42 +0200, Ingo Molnar wrote:
> * Yinghai Lu <yhlu.kernel@...il.com> wrote:
>
> > +static unsigned long long tsc_clock(int cpu)
> > +{
> > + unsigned long long t;
> > +
> > + rdtscll(t);
> > +
> > + return t;
> > +}
>
> hm, i'm not sure i like the whole direction - this reintroduces
> printk_clock in essence.
>
> how about initializing cpu_clock() sooner, so that printk timestamps
> start ticking as soon as possible?
which will make some archs quite unhappy iirc, see those arm and ia64
bugs I caused the other day.
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