Messages in this thread | | | Date | Tue, 17 Dec 2002 12:10:38 -0800 | From | "H. Peter Anvin" <> | Subject | Re: Intel P6 vs P7 system call performance |
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Matti Aarnio wrote: > (cutting down To:/Cc:) > > On Tue, Dec 17, 2002 at 11:43:57AM -0800, H. Peter Anvin wrote: > >>Linus Torvalds wrote: >> >>>The thing is, gettimeofday() isn't _that_ special. It's just not worth a >>>vsyscall of it's own, I feel. Where do you stop? Do we do getpid() too? >>>Just because we can? >> >>getpid() could be implemented in userspace, but not via vsyscalls >>(instead it could be passed in the ELF data area at process start.) > > > After fork() or clone() ? > If we had only spawn(), and some separate way to start threads... >
fork() and clone() would have to return the self-pid as an auxilliary return value. This, of course, is getting rather fuggly.
Anything that cares caches getpid() anyway.
-hpa
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