linux-kernel - Re: [PATCH] perf tools: Store ids for events with their own cpus perf_event__synthesize_event_update

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Message-ID: <20181009100049.GF6499@krava>
Date:   Tue, 9 Oct 2018 12:00:49 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     John Garry <john.garry@...wei.com>
Cc:     Andi Kleen <ak@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Linuxarm <linuxarm@...wei.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH] perf tools: Store ids for events with their own cpus
 perf_event__synthesize_event_update_cpus

On Thu, Oct 04, 2018 at 10:20:39AM +0100, John Garry wrote:

SNIP

> > We synthesize an update event that needs to touch the evsel
> > id array, which is not defined at that time. Fixing this by
> > forcing the id allocation for events with theeir own cpus.
> > 
> > Reported-by: John Garry <john.garry@...wei.com>
> > Link: http://lkml.kernel.org/n/tip-8x4n7o34yheigoxm1jibflm6@git.kernel.org
> 
> Tested-by: John Garry <john.garry@...wei.com>
> 
> In terms of adding to stable, LT v4.14 is not affected, but 4.18.x is.
> 
> Thanks,
> John

Arnaldo, could you please pick up this one

thanks,
jirka

> 
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  tools/perf/builtin-report.c | 1 +
> >  tools/perf/util/evsel.c     | 3 +++
> >  2 files changed, 4 insertions(+)
> > 
> > diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> > index c0703979c51d..257c9c18cb7e 100644
> > --- a/tools/perf/builtin-report.c
> > +++ b/tools/perf/builtin-report.c
> > @@ -980,6 +980,7 @@ int cmd_report(int argc, const char **argv)
> >  			.id_index	 = perf_event__process_id_index,
> >  			.auxtrace_info	 = perf_event__process_auxtrace_info,
> >  			.auxtrace	 = perf_event__process_auxtrace,
> > +			.event_update	 = perf_event__process_event_update,
> >  			.feature	 = process_feature_event,
> >  			.ordered_events	 = true,
> >  			.ordering_requires_timestamps = true,
> > diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> > index ac6cfb8b085e..7a0d5fbaf3c1 100644
> > --- a/tools/perf/util/evsel.c
> > +++ b/tools/perf/util/evsel.c
> > @@ -1088,6 +1088,9 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
> >  		attr->exclude_user   = 1;
> >  	}
> > 
> > +	if (evsel->own_cpus)
> > +		evsel->attr.read_format |= PERF_FORMAT_ID;
> > +
> >  	/*
> >  	 * Apply event specific term settings,
> >  	 * it overloads any global configuration.
> > 
> 
>