linux-kernel - Re: [PATCH 05/16] sched: SCHED_DEADLINE policy implementation.

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Message-ID: <1335218328.28150.181.camel@twins>
Date:	Mon, 23 Apr 2012 23:58:48 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tommaso Cucinotta <tommaso.cucinotta@...up.it>
Cc:	Juri Lelli <juri.lelli@...il.com>, tglx@...utronix.de,
	mingo@...hat.com, rostedt@...dmis.org, cfriesen@...tel.com,
	oleg@...hat.com, fweisbec@...il.com, darren@...art.com,
	johan.eker@...csson.com, p.faure@...tech.ch,
	linux-kernel@...r.kernel.org, claudio@...dence.eu.com,
	michael@...rulasolutions.com, fchecconi@...il.com,
	nicola.manica@...i.unitn.it, luca.abeni@...tn.it,
	dhaval.giani@...il.com, hgu1972@...il.com,
	paulmck@...ux.vnet.ibm.com, raistlin@...ux.it,
	insop.song@...csson.com, liming.wang@...driver.com
Subject: Re: [PATCH 05/16] sched: SCHED_DEADLINE policy implementation.

On Mon, 2012-04-23 at 22:55 +0100, Tommaso Cucinotta wrote:
> why not write this straight in asm, i.e., multiply 64*64 then divide by 
> 64 keeping the intermediate result on 128 bits? 

If you know of a way to do this for all 30 odd architectures supported
by our beloved kernel, do let me know ;-)

Yes I can do it for x86_64, but people tend to get mighty upset if you
break the compile for all other arches...
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