linux-kernel - RFC: callchain showing same entry as hist

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Date:	Tue, 16 Aug 2016 11:36:28 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Jiri Olsa <jolsa@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: RFC: callchain showing same entry as hist_entry

Hi Namhyung, Jiri,

	please take a look at the patch below, and Ack if possible, it
is a problem introduced in:

  cfaa154b2335 ("perf tools: Get rid of obsolete hist_entry__sort_list")

That is not equivalent to the code that was there and results in having
the same entry as the first entry for the callchain as in the
hist_entry, which is annoying and doesn't match the original intent of
that 'continue' branch, as described in the comment right above it.

Now looking at doing the same for the TUI...

- Arnaldo

diff --git a/tools/perf/ui/stdio/hist.c b/tools/perf/ui/stdio/hist.c
index 9b65f4a6b35a..46a083e59ce9 100644
--- a/tools/perf/ui/stdio/hist.c
+++ b/tools/perf/ui/stdio/hist.c
@@ -207,7 +207,7 @@ static size_t callchain__fprintf_graph(FILE *fp, struct rb_root *root,
 			 * displayed twice.
 			 */
 			if (!i++ && field_order == NULL &&
-			    sort_order && !prefixcmp(sort_order, "sym"))
+			    (sort_order == NULL || !prefixcmp(sort_order, "sym")))
 				continue;
 			if (!printed) {
 				ret += callchain__fprintf_left_margin(fp, left_margin);