Re: [PATCH] x86_64 Avoid some atomic operations during address space destruction

[Andi Kleen <ak@suse.de>]

On Sunday 07 August 2005 14:16, Zachary Amsden wrote:
> This turned out to be a huge win on 32-bit i386 in PAE mode, but it is
> likely not as significant on x86_64; I don't know because I haven't
> actually measured the cost.  I don't have 64-bit hardware that I have
> the luxury of rebooting right now, so this patch is untested, but if
> someone wants to try this out, it might actually show a measurable win
> on fork/exit.  I lost my cycle count measurement diffs, but I don't
> think they would apply cleanly to x86_64 anyways.  This patch at least
> looks good, and compiles cleanly on 2.6.13-rc5-mm1, thus passing some
> level of testing.

FYI I have queued it, but cannot apply it because the necessary generic
code support is still not in mainline.

Do you have any other optimizations pending for x86-64? 

There is still the iopl optimization that you did that is on my TODO list to 
add. Anything else.

-Andi