Messages in this thread | | | Subject | Re: [PATCH] perf: add support for per-event sampling period or frequency in perf record | From | Peter Zijlstra <> | Date | Tue, 23 Nov 2010 12:11:20 +0100 |
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On Tue, 2010-11-23 at 11:45 +0200, Stephane Eranian wrote: > This patch allows specifying a per event sampling period or frequency. > Up until now, the same sampling period or frequency was applied to all > the events specified on the command line of perf record. A sampling > period depends on the event, thus it is necessary to specify it per event. > > With this patch, both the -F and -c options now take a comma separated > list of values. If a value is omitted for an event, it defaults to 1000Hz > frequency mode as before. > > $ perf record -e cycles,instructions -c 100000,200000 -a -- sleep 5
I remember an email not too long ago where people proposed to change the syntax so that:
-e evnt1,evnt2 -- create a group containing both events -e evnt1 -e evnt2 -- create two separate events
It would be nice to make sure these two proposals will not interfere.
Alternatively we extend the event syntax to include the period, something like:
-e evnt1:period=1234
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