linux-kernel - Re: [PATCH/RFC 09/16] perf tools: Update hist entry's hists pointer

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Date:	Mon, 14 Dec 2015 00:28:12 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH/RFC 09/16] perf tools: Update hist entry's hists pointer

On Mon, Dec 14, 2015 at 12:23:30AM +0100, Jiri Olsa wrote:
> On Thu, Dec 10, 2015 at 04:53:28PM +0900, Namhyung Kim wrote:
> > When sample is processed using multi-thread, each sample is gathered on
> > each thread's hist tree and then merged into the real hist tree.  But
> > hist_entry->hists pointer was not updated so it could refer wrong hists
> > resulted in missing outputs.
> > 
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> >  tools/perf/util/hist.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> > index ea4f3ad978b0..a12e5022fe04 100644
> > --- a/tools/perf/util/hist.c
> > +++ b/tools/perf/util/hist.c
> > @@ -1008,6 +1008,14 @@ bool hists__collapse_insert_entry(struct hists *hists __maybe_unused,
> 
> there's 'struct hists *hists __maybe_unused' in hists__collapse_insert_entry def..

also hists__collapse_insert_entry is global which seems unnecessary

jirka

> 
> jirka
> 
> >  	}
> >  	hists->nr_entries++;
> >  
> > +	/*
> > +	 * If a hist entry is processed in multi-threaded environment,
> > +	 * it points to a dummy local hists which was used only for
> > +	 * intermidate processing.  So update it to a real one so that
> > +	 * it can find the correct info later.
> > +	 */
> > +	he->hists = hists;
> > +
> >  	rb_link_node(&he->rb_node_in, parent, p);
> >  	rb_insert_color(&he->rb_node_in, root);
> >  	return true;
> > -- 
> > 2.6.2
> > 
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