linux-kernel - [tip:perf/urgent] perf callchain: Append callchains only when requested

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Date:	Thu, 1 Jan 2015 13:29:08 -0800
From:	tip-bot for Namhyung Kim <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	dsahern@...il.com, jolsa@...hat.com, a.p.zijlstra@...llo.nl,
	hpa@...or.com, eranian@...gle.com, mingo@...nel.org,
	namhyung@...nel.org, acme@...hat.com, linux-kernel@...r.kernel.org,
	adrian.hunter@...el.com, tglx@...utronix.de
Subject: [tip:perf/urgent] perf callchain:
  Append callchains only when requested

Commit-ID:  82aa019e0098a1e0801df94345c0297448323126
Gitweb:     http://git.kernel.org/tip/82aa019e0098a1e0801df94345c0297448323126
Author:     Namhyung Kim <namhyung@...nel.org>
AuthorDate: Mon, 22 Dec 2014 13:44:14 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 23 Dec 2014 12:06:39 -0300

perf callchain: Append callchains only when requested

The perf report --children can be called with callchain disabled so no
need to append callchains.  Actually the root of callchain tree is not
initialized properly in this case.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/r/1419223455-4362-7-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/hist.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 1cc6ea4..0ced178 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -304,7 +304,7 @@ static struct hist_entry *hist_entry__new(struct hist_entry *template,
 	size_t callchain_size = 0;
 	struct hist_entry *he;
 
-	if (symbol_conf.use_callchain || symbol_conf.cumulate_callchain)
+	if (symbol_conf.use_callchain)
 		callchain_size = sizeof(struct callchain_root);
 
 	he = zalloc(sizeof(*he) + callchain_size);
@@ -737,7 +737,7 @@ iter_add_single_cumulative_entry(struct hist_entry_iter *iter,
 	iter->he = he;
 	he_cache[iter->curr++] = he;
 
-	callchain_append(he->callchain, &callchain_cursor, sample->period);
+	hist_entry__append_callchain(he, sample);
 
 	/*
 	 * We need to re-initialize the cursor since callchain_append()
@@ -810,7 +810,8 @@ iter_add_next_cumulative_entry(struct hist_entry_iter *iter,
 	iter->he = he;
 	he_cache[iter->curr++] = he;
 
-	callchain_append(he->callchain, &cursor, sample->period);
+	if (symbol_conf.use_callchain)
+		callchain_append(he->callchain, &cursor, sample->period);
 	return 0;
 }
 
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