linux-kernel - Re: [PATCH] sched: Support current clocksource handling in fallback sched

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Date:	Thu, 28 May 2009 09:13:38 -0700
From:	Daniel Walker <dwalker@...o99.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Paul Mundt <lethal@...ux-sh.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Walleij <linus.ml.walleij@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Victor <linux@...im.org.za>,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	John Stultz <johnstul@...ux.vnet.ibm.com>
Subject: Re: [PATCH] sched: Support current clocksource handling in
	fallback sched_clock().

On Thu, 2009-05-28 at 14:59 +0200, Peter Zijlstra wrote:

> 
> 
> CPU0                           CPU1
> 
> clock = ACCESS_ONCE(sched_clocksource);
> 
>                                unload module
>                                  clocksource_unregister()
>                                    sched_clocksource = jiffies
>                                  unmap data/text
> 
> cyc2ns(clock, clocksource_read(clock)) <--- fireworks
> 
> 

Do any module based clocksources even exist right now?
clocksource_unregister only seems to be used 3 times..

Daniel

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