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

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Date:   Mon, 14 Jun 2021 13:17:08 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     "nakamura.shun@...itsu.com" <nakamura.shun@...itsu.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

On Mon, Jun 14, 2021 at 07:17:53AM +0000, nakamura.shun@...itsu.com wrote:
> Hello.
> 
> perf_evsel__open cannot create an event group because it set group_fd
> to -1 when it ran perf_event_open.
> Is there any reason why group_fd is fixed at -1?

hi,
there'no leader link on this level yet (in struct evsel)
so this is not implemented at the moment

jirka

> 
> Best Regards
> Shunsuke