Messages in this thread | | | Date | Mon, 08 Jan 2007 15:54:48 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] All Transmeta CPUs have constant TSCs |
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dean gaudet wrote: > On Mon, 8 Jan 2007, H. Peter Anvin wrote: > >> I *definitely* support the concept that RDPMC 0 should could CPU cycles by >> convention in Linux. > > unfortunately that'd be very limiting and annoying on core2 processors > which have dedicated perf counters for clocks unhalted (actual vs. > nominal), but only 2 configurable perf counters. i forget what ecx value > gets you the dedicated counters... but a solution which might work would > be a syscall to return the perf counter number... > > or we could just merge perfmon ;) >
OK, if there are dedicated counters in hardware at a different number, we probably should make it an ELF entry value (no need to make it a syscall for a constant.)
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