linux-kernel - [tip:perf/core] perf probe: Fix line walker to check CU correctly

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Date:	Sun, 14 Aug 2011 15:40:45 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 line walker to check CU correctly

Commit-ID:  a128405c6b40371c59c34b00cc66ed06285b9551
Gitweb:     http://git.kernel.org/tip/a128405c6b40371c59c34b00cc66ed06285b9551
Author:     Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
AuthorDate: Thu, 11 Aug 2011 20:02:35 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 12 Aug 2011 09:22:46 -0300

perf probe: Fix line walker to check CU correctly

Fix line walker to check whether a given DIE is CU or not.

Actually this function accepts CU, subprogram and inlined_subroutine
DIEs.

Without this fix, perf probe always fails to analyze lines on inlined
functions;

$ perf probe -L pre_schedule
Debuginfo analysis failed. (-2)
  Error: Failed to show lines. (-2)

This fixes that bug, as below.

$ perf probe -L pre_schedule
<pre_schedule@...me/mhiramat/ksrc/linux-2.6/kernel/sched.c:0>
      0  static inline void pre_schedule(struct rq *rq, struct task_struct *prev
         {
      2         if (prev->sched_class->pre_schedule)
      3                 prev->sched_class->pre_schedule(rq, prev);
         }

         /* rq->lock is NOT held, but preemption is disabled */

Changes from v1:
 - Update against current tip tree.(Fix dwarf-aux.c)

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/20110811110235.19900.20614.stgit@fedora15
Signed-off-by: Masami Hiramatsu <masami.hiramatsu@...il.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/dwarf-aux.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
index fddf40f..d35b454 100644
--- a/tools/perf/util/dwarf-aux.c
+++ b/tools/perf/util/dwarf-aux.c
@@ -439,7 +439,7 @@ static int __die_walk_culines_cb(Dwarf_Die *sp_die, void *data)
 
 /**
  * die_walk_lines - Walk on lines inside given DIE
- * @rt_die: a root DIE (CU or subprogram)
+ * @rt_die: a root DIE (CU, subprogram or inlined_subroutine)
  * @callback: callback routine
  * @data: user data
  *
@@ -460,12 +460,12 @@ int die_walk_lines(Dwarf_Die *rt_die, line_walk_callback_t callback, void *data)
 	size_t nlines, i;
 
 	/* Get the CU die */
-	if (dwarf_tag(rt_die) == DW_TAG_subprogram)
+	if (dwarf_tag(rt_die) != DW_TAG_compile_unit)
 		cu_die = dwarf_diecu(rt_die, &die_mem, NULL, NULL);
 	else
 		cu_die = rt_die;
 	if (!cu_die) {
-		pr_debug2("Failed to get CU from subprogram\n");
+		pr_debug2("Failed to get CU from given DIE.\n");
 		return -EINVAL;
 	}
 
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