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

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Message-ID: <20081114033041.GD24414@wotan.suse.de>
Date:	Fri, 14 Nov 2008 04:30:41 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
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 Thu, Nov 13, 2008 at 07:18:11PM -0800, Linus Torvalds wrote:
> 
> 
> 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.

Oh OK. I am going to add those changes that you suggested (in fact, I
already have). I just thought for some reason you wanted it to make
further cleanups or something.

I wasn't arguing against that. Or against refactoring the code in as
clean a way possible if there is any refactoring happening at all for
any reason (eg. performance or functionality as the primary reason).
I just wasn't going to repost the patch because as I said, my level of
testing and the relative urgency of it wouldn't justify it.
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