linux-kernel - Re: [PATCH 01/16] math128: Introduce various 128bit primitives

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Message-ID: <alpine.LFD.2.02.1210262033300.2756@ionos>
Date:	Fri, 26 Oct 2012 20:34:04 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	Juri Lelli <juri.lelli@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	mingo@...hat.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,
	tommaso.cucinotta@...up.it, 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,
	jkacur@...hat.com, harald.gustafsson@...csson.com,
	vincent.guittot@...aro.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 01/16] math128: Introduce various 128bit primitives

On Fri, 26 Oct 2012, Steven Rostedt wrote:

> On Fri, 2012-10-26 at 11:12 -0700, Juri Lelli wrote:
> 
> > - scale down (right by 10) incoming parameters as to do internal
> >    math with ~1us resolution (and scale up outgoing params)
> 
> Would scaling down by 9 be sufficient? That way the resolution is still
> just less than 1us.

You have to do rounding anyway. So it does not matter whether you
chose 10 or 9.
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