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From:   "nakamura.shun@fujitsu.com" <nakamura.shun@fujitsu.com>
To:     Jiri Olsa <jolsa@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>
CC:     Ingo Molnar <mingo@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Rob Herring <robh@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-perf-users@vger.kernel.org" <linux-perf-users@vger.kernel.org>
Subject: Re: libperf: lack of interface
Thread-Topic: libperf: lack of interface
Thread-Index: AQHXnxU1v7C7yDhEy0Gzl7rxTcNZhquPLp8AgAE//ACAHexCHw==
Date:   Tue, 21 Sep 2021 09:46:59 +0000
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Hi, Jirka, Arnaldo, and Peter=0A=
Sorry for the late reply.=0A=
=0A=
> On Wed, Sep 01, 2021 at 10:36:40AM -0300, Arnaldo Carvalho de Melo wrote:=
=0A=
> > Em Wed, Sep 01, 2021 at 09:45:10AM +0000, nakamura.shun@fujitsu.com esc=
reveu:=0A=
> > > Hello.=0A=
> > > =0A=
> > > I'm trying to change rdpmc test in perf_event_tests[1] to use libperf=
, but libperf doesn't have enough interfaces.=0A=
> > > Does anyone plan to implement any of these libperf features?=0A=
> > > =0A=
> > > - Interfaces that can run ioctl (PERF_EVENT_IOC_RESET) from userland=
=0A=
> > > - Interfaces that can run fcntl (SIGIO) from userland=0A=
> =0A=
> hi,=0A=
> we could add perf_evsel__fd like below, would it help your usecase?=0A=
> =0A=
> if you described your usecases in more details we could=0A=
> see if we could add/move something to libperf for that=0A=
> =0A=
> as Arnaldo said below it could be already in tools/perf/util/*.c=0A=
> somewhere ;-)=0A=
=0A=
As Peter says, I understood that for rdpmc, no reset is needed.=0A=
=0A=
However, PAPI resets it explicitly, for example, at PAPI_reset.=0A=
In other, PAPI also has the ability to call PERF_EVENT_IOC_REFLESH on overf=
low to call a user-registered handler, using SIGIO.=0A=
=0A=
I think it is desirable to be able to achieve similar functionality.=0A=
=0A=
Best Regards=0A=
Shunsuke=0A=
=0A=