linux-kernel - [PATCH 3/3] perf sched timehist: Enlarge max stack depth by 2

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Date:   Thu, 24 Nov 2016 10:11:14 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Ahern <dsahern@...il.com>,
        Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <andi@...stfloor.org>
Subject: [PATCH 3/3] perf sched timehist: Enlarge max stack depth by 2

When it records callchains, they will always have 2 scheduler functions
(__schedule + schedule or __schedule + preempt_schedule) and get
ignored.  So it should collect 2 more functions to show the expected
number of callchains to user.

Cc: David Ahern <dsahern@...il.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/builtin-sched.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 06be809a02ab..a49a032f5b15 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1960,7 +1960,7 @@ static bool is_idle_sample(struct perf_sched *sched,
 		return false;
 
 	if (thread__resolve_callchain(thread, cursor, evsel, sample,
-				      NULL, NULL, sched->max_stack) != 0) {
+				      NULL, NULL, sched->max_stack + 2) != 0) {
 		if (verbose)
 			error("Failed to resolve callchain. Skipping\n");
 
-- 
2.10.0