linux-kernel - Re: sched_clock

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Message-ID: <4BC829D1.5070001@petalogix.com>
Date:	Fri, 16 Apr 2010 11:11:45 +0200
From:	Michal Simek <michal.simek@...alogix.com>
To:	Arnd Bergmann <arnd@...db.de>
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

Arnd Bergmann wrote:
> 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.

ok. I will return 0 before timer initialization.

Thanks for explanation,
Michal

> 
> 	Arnd


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Michal Simek, Ing. (M.Eng)
PetaLogix - Linux Solutions for a Reconfigurable World
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