Messages in this thread | | | Date | Wed, 20 Oct 2021 14:20:21 +0200 | From | Jiri Olsa <> | Subject | Re: libperf: lack of interface |
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On Mon, Oct 18, 2021 at 08:57:20AM +0000, nakamura.shun@fujitsu.com wrote: > Hi > > > > On Wed, Sep 01, 2021 at 10:36:40AM -0300, Arnaldo Carvalho de Melo wrote: > > > > Em Wed, Sep 01, 2021 at 09:45:10AM +0000, nakamura.shun@fujitsu.com escreveu: > > > > > Hello. > > > > > > > > > > I'm trying to change rdpmc test in perf_event_tests[1] to use libperf, but libperf doesn't have enough interfaces. > > > > > Does anyone plan to implement any of these libperf features? > > > > > > > > > > - Interfaces that can run ioctl (PERF_EVENT_IOC_RESET) from userland > > > > > - Interfaces that can run fcntl (SIGIO) from userland > > > > > > hi, > > > we could add perf_evsel__fd like below, would it help your usecase? > > > > > > if you described your usecases in more details we could > > > see if we could add/move something to libperf for that > > > > > > as Arnaldo said below it could be already in tools/perf/util/*.c > > > somewhere ;-) > > > > As Peter says, I understood that for rdpmc, no reset is needed. > > > > However, PAPI resets it explicitly, for example, at PAPI_reset. > > In other, PAPI also has the ability to call PERF_EVENT_IOC_REFLESH on overflow to call a user-registered handler, using SIGIO. > > > > I think it is desirable to be able to achieve similar functionality. > > Does anyone have any comments?
I'll try to add that functionality soon, I'll cc you on patch
jirka
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