linux-kernel - Re: [patch for 2.6.26 0/7] Architecture Independent Markers

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Message-ID: <20080328141845.GF29218@elte.hu>
Date:	Fri, 28 Mar 2008 15:18:47 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	KOSAKI Motohiro <m-kosaki@...es.dti.ne.jp>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch for 2.6.26 0/7] Architecture Independent Markers


* Frank Ch. Eigler <fche@...hat.com> wrote:

> 
> >> >  NACK-ed-by: Ingo Molnar <mingo@...e.hu>
> >> [...]
> >> I wonder why nobody doesn't fix this serious problem until now. [...]
> 
> Frankly, the "problem" has not yet been established.  Ingo has failed 
> to respond to Mathieu's analysis of the actual instruction streams, 
> which cast doubt on Ingo's technique of simply counting bytes. [...]

uhm no. The "difference" is due to Matthieu counting on the platform 
that is most favorable to his argument: 32-bit, while i counted on 
64-bit where most servers operate (and where instrumentation micro-cost 
actually matters).

	Ingo
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