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

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Date:	Fri, 30 May 2008 20:59:29 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ulrich Drepper <drepper@...hat.com>
cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mtk.manpages@...il.com
Subject: Re: [PATCH 3/3] 64-bit futexes: x86 support

On Fri, 30 May 2008, Ulrich Drepper wrote:
> 
> In any case, robbing 64-bit architectures of the possible performance
> gain just because there are ancient versions which cannot do it is just
> plain stupid.  I know you cannot suggest that.

I'm suggesting that there are better approaches than forcing yet another 
new interface onto this thing. As mentioned, the kernel has had 32-bit 
rwsemaphores for a long time. Yes, there is "extra information" outside 
the 32-bit field, but I suspect you simply haven't looked hard enough at 
just using the existing futex code.

You certainly didn't even read - or understand - my emails, since you 
thought I was talking about regular semaphores and ignored the "rw" part 
entirely (not to mention the fact that I talked about reader counts etc, 
which is why I think you didn't even read the email).

		Linus
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