linux-kernel - Re: [PATCH 08 of 11] anon-vma-rwsem

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Message-ID: <alpine.LFD.1.10.0805071604480.3024@woody.linux-foundation.org>
Date:	Wed, 7 May 2008 16:09:48 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andrea Arcangeli <andrea@...ranet.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>,
	Jack Steiner <steiner@....com>, Robin Holt <holt@....com>,
	Nick Piggin <npiggin@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	kvm-devel@...ts.sourceforge.net,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	Roland Dreier <rdreier@...co.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	linux-kernel@...r.kernel.org, Avi Kivity <avi@...ranet.com>,
	linux-mm@...ck.org, general@...ts.openfabrics.org,
	Hugh Dickins <hugh@...itas.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Anthony Liguori <aliguori@...ibm.com>,
	Chris Wright <chrisw@...hat.com>,
	Marcelo Tosatti <marcelo@...ck.org>,
	Eric Dumazet <dada1@...mosbay.com>,
	"Paul E. McKenney" <paulmck@...ibm.com>
Subject: Re: [PATCH 08 of 11] anon-vma-rwsem

On Thu, 8 May 2008, Andrea Arcangeli wrote:
>
> mmu_notifier_register only runs when windows or linux or macosx
> boots. Who could ever care of the msec spent in mm_lock compared to
> the time it takes to linux to boot?

Andrea, you're *this* close to going to my list of people who it is not 
worth reading email from, and where it's better for everybody involved if 
I just teach my spam-filter about it.

That code was CRAP.

That code was crap whether it's used once, or whether it's used a million 
times. Stop making excuses for it just because it's not performance- 
critical.

So give it up already. I told you what the non-crap solution was. It's 
simpler, faster, and is about two lines of code compared to the crappy 
version (which was what - 200 lines of crap with a big comment on top of 
it just to explain the idiocy?).

So until you can understand the better solution, don't even bother 
emailing me, ok? Because the next email I get from you that shows the 
intelligence level of a gnat, I'll just give up and put you in a 
spam-filter.

Because my IQ goes down just from reading your mails. I can't afford to 
continue.

		Linus
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