linux-kernel - [tip:perf/core] perf probe: Fix to walk all inline instances

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Date:	Sun, 14 Aug 2011 15:42:55 GMT
From:	tip-bot for Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, paulus@...ba.org,
	hpa@...or.com, mingo@...hat.com, peterz@...radead.org,
	penberg@...nel.org, masami.hiramatsu@...il.com,
	masami.hiramatsu.pt@...achi.com, fweisbec@...il.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/core] perf probe: Fix to walk all inline instances

Commit-ID:  36c0c588b9ea979b619d6ddced410f9551e4c5fa
Gitweb:     http://git.kernel.org/tip/36c0c588b9ea979b619d6ddced410f9551e4c5fa
Author:     Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
AuthorDate: Thu, 11 Aug 2011 20:02:47 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 12 Aug 2011 09:25:38 -0300

perf probe: Fix to walk all inline instances

Fix line-range collector to walk all instances of inlined function,
because some execution paths can be optimized out depending on the
function argument of instances.

E.g.)
inline_func (arg) {
	if (arg)
		do_something;
	else
		do_another;
}

func_A() {
	inline_func(1)
}

func_B() {
	inline_func(0)
}

In this case, func_A may have only do_something code and func_B may have
only do_another.

Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Masami Hiramatsu <masami.hiramatsu@...il.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Pekka Enberg <penberg@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: yrl.pp-manager.tt@...achi.com
Link: http://lkml.kernel.org/r/20110811110247.19900.93702.stgit@fedora15
Signed-off-by: Masami Hiramatsu <masami.hiramatsu@...il.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/probe-finder.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 573c723..d6d5768 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1393,7 +1393,13 @@ static int line_range_inline_cb(Dwarf_Die *in_die, void *data)
 	struct dwarf_callback_param *param = data;
 
 	param->retval = find_line_range_by_line(in_die, param->data);
-	return DWARF_CB_ABORT;	/* No need to find other instances */
+
+	/*
+	 * We have to check all instances of inlined function, because
+	 * some execution paths can be optimized out depends on the
+	 * function argument of instances
+	 */
+	return DWARF_CB_OK;
 }
 
 /* Search function from function name */
--
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