Messages in this thread | | | Date | Wed, 18 Dec 2002 12:14:14 -0800 | From | "H. Peter Anvin" <> | Subject | Re: Intel P6 vs P7 system call performance |
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Terje Eggestad wrote: > what about: > > int (*_vsyscall) (int, ...); > _vsyscall = mmap(NULL, getpagesize(), PROT_READ|PROT_EXEC, > MAP_VSYSCALL, , ); > > or if you're afraid of running out of MAP_* flags: > > fd = open("/dev/vsyscall", ); > _vsyscall = mmap(NULL, getpagesize(), PROT_READ|PROT_EXEC, MAP_SHARED, > fd, 0); > > Then you can leisurely map it in just after the programs text segment. >
Very ugly -- then the application has to do indirect calls.
-hpa
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