linux-kernel - Re: [PATCH] x86: printk_time to use tsc before cpu

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Message-ID: <20080827074230.GA20993@elte.hu>
Date:	Wed, 27 Aug 2008 09:42:30 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] x86: printk_time to use tsc before cpu_clock is ready


* 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?

	Ingo
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