Messages in this thread | | | Subject | Re: [PATCH 3/6] perf record: add time-of-day option | From | Peter Zijlstra <> | Date | Tue, 01 Mar 2011 17:37:15 +0100 |
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On Tue, 2011-03-01 at 09:09 -0700, David Ahern wrote: > > I did not code it create samples of a realtime-clock event; I coded it > to add an event to the stream on demand -- whatever event the fd is > tied to. > > Well yes, but aside from you and the realtime clock stuff, who'd ever want to do this particular thing?
I'd much rather expose the whole local_clock()/perf_clock()/trace_clock() (should all be the same anyway) as a posix clock using CLOCK_TRACING or whatever would be an appropriate name.
[ Since the whole thing is NMI safe it should be well possible to make a VDSO version as well. ]
Anyway, once its visible as a posix clock you can sync up from userspace. And this clock is indeed wanted for other things too, like user-space tracing etc.
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