linux-kernel - Re: libperf : Can not create event group

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Message-ID: <OSBPR01MB46001F16CB31046C42947ACBF7039@OSBPR01MB4600.jpnprd01.prod.outlook.com>
Date:   Mon, 28 Jun 2021 08:44:52 +0000
From:   "nakamura.shun@...itsu.com" <nakamura.shun@...itsu.com>
To:     Jiri Olsa <jolsa@...hat.com>
CC:     "peterz@...radead.org" <peterz@...radead.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "acme@...nel.org" <acme@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "alexander.shishkin@...ux.intel.com" 
        <alexander.shishkin@...ux.intel.com>,
        "namhyung@...nel.org" <namhyung@...nel.org>,
        "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: libperf : Can not create event group

Hi, jirka

> > Do you have any plans to support the event group in libperf?
> 
> hi,
> not until now I guess ;-) what's your use case?

PAPI uses event group to measure multiple events.
libperf uses multiplexing regardless of the user's intent.

I thought it would be nice if users could choose to use multiplexing or event groups.


Best Regards
Shunsuke

jirka