Re: Intel P6 vs P7 system call performance

H. Peter Anvin (hpa@transmeta.com)
Thu, 19 Dec 2002 14:16:02 -0800


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

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