linux-kernel - Re: [rfc] x86: optimise page fault path a little

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Message-ID: <alpine.LFD.2.00.0811131916530.3468@nehalem.linux-foundation.org>
Date:	Thu, 13 Nov 2008 19:18:11 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Nick Piggin <npiggin@...e.de>
cc:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [rfc] x86: optimise page fault path a little



On Fri, 14 Nov 2008, Nick Piggin wrote:
> 
> I don't exactly know what you mean by random micro-optimization. It is
> what it is. I like counting cachelines and branches and I thought you
> did as well.

You're missing the point.

If you spent a bit more time on it, it would be a cleanup too, and we 
wouldn't need this discussion.

As it is, it's a wash. At which point I'd simply rather not touch the 
code. 

You can have your cake and eat it too, and I tried to explain how. And I 
don't understand why you argue against it.

		Linus
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