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

[Linus Torvalds <torvalds@linux-foundation.org>]

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