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

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Date:	Mon, 14 Dec 2015 00:23:30 +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 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..

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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