linux-kernel - Re: [PATCH 15/26] perf tools: Synthesize proc tasks with mmap3

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Date:   Mon, 14 Sep 2020 22:51:50 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Song Liu <songliubraving@...com>,
        "Frank Ch. Eigler" <fche@...hat.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 15/26] perf tools: Synthesize proc tasks with mmap3

On Mon, Sep 14, 2020 at 01:07:38PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Sun, Sep 13, 2020 at 11:03:02PM +0200, Jiri Olsa escreveu:
> > Synthesizing proc tasks with mmap3 events so we can
> > get build id data for synthesized maps as well.
> > 
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  tools/perf/util/mmap.c             |  2 +-
> >  tools/perf/util/synthetic-events.c | 72 +++++++++++++++++-------------
> >  2 files changed, 43 insertions(+), 31 deletions(-)
> > 
> > diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
> > index ab7108d22428..51f6f86580a9 100644
> > --- a/tools/perf/util/mmap.c
> > +++ b/tools/perf/util/mmap.c
> > @@ -33,7 +33,7 @@ void mmap_cpu_mask__scnprintf(struct mmap_cpu_mask *mask, const char *tag)
> >  
> >  	len = bitmap_scnprintf(mask->bits, mask->nbits, buf, MASK_SIZE);
> >  	buf[len] = '\0';
> > -	pr_debug("%p: %s mask[%zd]: %s\n", mask, tag, mask->nbits, buf);
> > +	pr_debug2("%p: %s mask[%zd]: %s\n", mask, tag, mask->nbits, buf);
> >  }
> 
> Can this be in a separate patch?

ok

>   
> >  size_t mmap__mmap_len(struct mmap *map)
> > diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
> > index 89b390623b63..bd6e7b84283d 100644
> > --- a/tools/perf/util/synthetic-events.c
> > +++ b/tools/perf/util/synthetic-events.c
> > @@ -379,7 +379,7 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
> >  	}
> >  	io__init(&io, io.fd, bf, sizeof(bf));
> >  
> > -	event->header.type = PERF_RECORD_MMAP2;
> > +	event->header.type = PERF_RECORD_MMAP3;
> 
> This also needs to check if the user is interested in build-id records.
> If it is disabled, then using this new tool with mmap3 support will
> generate perf.data files that will bot be grokked by older tools,
> introducing an annoyance for people not interested in build-ids.

ok, this should disappear with if we stay with mmap2
and do that union stuff

thanks,
jirka