linux-kernel - Re: [GIT PULL] Performance Counters for Linux

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Message-ID: <alpine.LFD.2.01.0906111142390.3573@localhost.localdomain>
Date:	Thu, 11 Jun 2009 11:44:54 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	David Newall <davidn@...idnewall.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Hellwig <hch@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Al Viro <viro@...iv.linux.org.uk>, Ingo Molnar <mingo@...e.hu>,
	"David S. Miller" <davem@...emloft.net>,
	Stephane Eranian <eranian@...glemail.com>,
	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [GIT PULL] Performance Counters for Linux



On Fri, 12 Jun 2009, David Newall wrote:
> 
> While I'm still unable to help noticing things, nobody seems to have
> presented an argument that user-space and kernel-side will need to be
> developed together.

Well, I tried to give two reasons in my reply to Martin (it's there 
somewhere in cyberspace, a couple of minutes ago). Basically timeliness 
(kernel features vs taking advantage of them) and co-development (there 
always seems to be a huge impedance mis-match between user-level 
developers and kernel developers).

			Linus
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