linux-kernel - Re: [PATCH 3/3] 64-bit futexes: x86 support

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Message-ID: <4840D807.2030406@redhat.com>
Date:	Fri, 30 May 2008 21:45:59 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mtk.manpages@...il.com
Subject: Re: [PATCH 3/3] 64-bit futexes: x86 support

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Linus Torvalds wrote:
> You just blindly 
> claim that you're the only one who can know things like this and can do 
> serialization, and that your way is the only approach.

Nonsense.  As you wrote yourself, you're only guessing about your
approaches.  You didn't check what we currently do (which is the extra
data stored protected by locks) and you suggest this scheme.

Then you suggest hand-wavingly other schemes and I explain why they
cannot work as efficiently.  I never doubted that they cannot work at
all.  If performance wouldn't be important I would not have to change
the current implementation which works semantically just fine.

> Sure, futex use and user space is not the same as the kernel code. It's 
> possible that you really do need 64-bit futexes. But quite frankly, the 
> only thing you have proven so far is that you're an ass.

Well, I don't know what you're reading into what I wrote.  I've only
explained what is wrong with each of your proposals and arguments.  If
pointing out the flaws makes me an ass then so be it.

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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