linux-kernel - Re: [RFC] Fast assurate clock readable from user space and NMI handler

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Message-ID: <20070227062913.GC1259@elte.hu>
Date:	Tue, 27 Feb 2007 07:29:14 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	mbligh@...gle.com, linux-kernel@...r.kernel.org,
	johnstul@...ibm.com, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC] Fast assurate clock readable from user space and NMI handler


* Daniel Walker <dwalker@...sta.com> wrote:

> The pit clocksource could be dropped pretty easy with my clocksource 
> update patches, which I'm still working on but you could easily drop 
> clock sources that aren't atomic like the pit .. Also the pit is 
> generally undesirable, so it's not going to be missed.

that's totally unacceptable, and i'm amazed you are even suggesting it - 
often the PIT ends up being the most reliable hardware clock in a PC. 
Btw., what's wrong with the spinlock that is protecting PIT access? It 
expresses the non-atomic property of the PIT just fine.

	Ingo
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