linux-kernel - Re: sched_clock

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Message-Id: <201004161037.26070.arnd@arndb.de>
Date:	Fri, 16 Apr 2010 10:37:25 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	michal.simek@...alogix.com
Cc:	wuzhangjin@...il.com, Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: sched_clock - microblaze

On Friday 16 April 2010, Michal Simek wrote:
> Why is sched_clock called in init_idle? Do you get any non zero value on 
> any ARCH?

Yes, some architectures return a real-time value here that starts before boot.
Also, when the clock starts at boot time, there can be a significant time
spent in the firmware and early kernel code before we get to init_idle.

	Arnd
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