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[213.175.37.12]) by smtp.gmail.com with ESMTPSA id y15sm202023edr.35.2021.12.07.09.04.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Dec 2021 09:04:20 -0800 (PST) Date: Tue, 7 Dec 2021 18:04:18 +0100 From: Jiri Olsa To: "nakamura.shun@fujitsu.com" Cc: Arnaldo Carvalho de Melo , Peter Zijlstra , Ingo Molnar , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Rob Herring , "linux-kernel@vger.kernel.org" , "linux-perf-users@vger.kernel.org" Subject: Re: libperf: lack of interface Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 07, 2021 at 05:49:16AM +0000, nakamura.shun@fujitsu.com wrote: > Hi jirka > > > > > 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 > > > > > > Thank you. > > > I look forward to your patch. > > > > Do you have a specific plan? > > I would like to know the rough period until your patch is made. > > I will also try to implement these interfaces. sorry for late reply, please do thanks, jirka