Messages in this thread |  | | Date | Fri, 17 Nov 2000 14:31:50 +0100 | From | Andi Kleen <> | Subject | Re: Error in x86 CPU capabilities starting with test5/6 |
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On Fri, Nov 17, 2000 at 02:21:03PM +0100, Christoph Rohland wrote: > Hi Jeff, > > On Fri, 17 Nov 2000, Jeff Garzik wrote: > > IIRC, this came up a long time ago WRT Apache, which made a lot of > > gettimeofday() calls. Someone (Linus?) proposed the solution of a > > 'magic page' which holds information like gettimeofday() stuff, but > > could be handled much more rapidly than a standard syscall. > > Yes, I followed that thread closely and would love to see this as the > implementation for gettimeofday. This would make rdtsc for > applications superfluous.
No it would not. Often you want cycle accurate couting for profiling purposes.
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