linux-kernel - Re: [PATCH] RFC: nomadik: expand timesource to 63 bits

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Date:	Fri, 12 Nov 2010 11:37:45 +0100
From:	Linus Walleij <linus.walleij@...ricsson.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	john stultz <johnstul@...ibm.com>,
	Rabin VINCENT <rabin.vincent@...ricsson.com>,
	Nicolas Pitre <nico@...xnic.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Colin Cross <ccross@...gle.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] RFC: nomadik: expand timesource to 63 bits

Thomas Gleixner wrote:
> On Fri, 12 Nov 2010, Linus Walleij wrote:
>> Uwe Kleine-König wrote:
>>
>>> Instead of implementing sched_clock for each architecture seperatly,
>>> wouldn't it be nice to have a generic sched_clock that uses the
>>> architecture's clocksource?  I tried to implement that some time ago,
>>> but tglx shoot it down because of locking problems.
>> I was and still am a big fan of this approach, I am willing to help
>> testing it if you want to dust off this patch set...
> 
> sched_clock is not necessarily the same as the current clocksource.

IIRC Uwe:s approach was that if and only if you would want to use
the clocksource for sched_clock() you provide a special flag on
the clocksource, and it will be attempted to be used for sched_clock().

Incidentally the dual use of a single free-running timer as both
single clocksource and sched_clock() baseline seem to creep up in
a lot of embedded platforms...

Yours,
Linus Walleij
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