Re: Intel P6 vs P7 system call performance

[H. Peter Anvin]

Jamie Lokier wrote:
> 
> Dynamic binaries or libraries can use the indirect call or relocate
> the calls at load time, or if they _really_ want a magic page at a
> position relative to the library, they can just _copy_ the magic page
> from 0xfffe0000.  It is not all that magic.
> 

That would make it impossible for the kernel to have kernel-controlled
data on that page|other page though...

I personally would like to see some better interface than mmap()
/proc/self/mem in order to alias pages, anyway.  We could use a
MAP_ALIAS flag in mmap() for this (where the fd would be ignored, but
the offset would matter.)

	-hpa