Messages in this thread | | | Date | Tue, 17 Dec 2002 21:38:50 -0800 | From | "H. Peter Anvin" <> | Subject | Re: Intel P6 vs P7 system call performance |
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Jeremy Fitzhardinge wrote: > On Tue, 2002-12-17 at 09:55, Linus Torvalds wrote: > >>Uli, how about I just add one ne warchitecture-specific ELF AT flag, which >>is the "base of sysinfo page". Right now that page is all zeroes except >>for the system call trampoline at the beginning, but we might want to add >>other system information to the page in the future (it is readable, after >>all). > > > The P4 optimisation guide promises horrible things if you write within > 2k of a cached instruction from another CPU (it dumps the whole trace > cache, it seems), so you'd need to be careful about mixing mutable data > and the syscall code in that page. > > Immutable data should be fine. >
Yes, you really want to use a second page.
-hpa
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