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
Date: Tue, 21 Sep 2021 09:46:59 +0000 [thread overview]
Message-ID: <OSBPR01MB4600E7C8C79D64125270D034F7A19@OSBPR01MB4600.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <YTCOVGyffe+VwL6G@krava>
Hi, Jirka, Arnaldo, and Peter
Sorry for the late reply.
> 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.
Best Regards
Shunsuke
next prev parent reply other threads:[~2021-09-21 9:47 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-01 9:45 libperf: lack of interface nakamura.shun
2021-09-01 9:57 ` Peter Zijlstra
2021-09-01 13:36 ` Arnaldo Carvalho de Melo
2021-09-02 8:41 ` Jiri Olsa
2021-09-21 9:46 ` nakamura.shun [this message]
2021-10-18 8:57 ` nakamura.shun
2021-10-20 12:20 ` Jiri Olsa
2021-10-22 6:17 ` nakamura.shun
2021-12-03 9:00 ` nakamura.shun
2021-12-07 5:49 ` nakamura.shun
2021-12-07 17:04 ` Jiri Olsa
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