linux-kernel - [Patch]fixed: perf cannot show existing process callgraph symbol

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Date:	Fri, 5 Feb 2010 09:02:42 -0800 (PST)
From:	austin_zhang@...ux.intel.com
To:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...e.hu,
	acme@...hat.com
Cc:	linux-kernel@...r.kernel.org, austin.zhang@...el.com
Subject: [Patch]fixed: perf cannot show existing process callgraph symbol

When 'perf record -g' a existing process, even with debuginfo
packages, still cannnot get symbol from 'perf report'.

try:
perf record -g -p `pidof xxx` -f
perf report

    68.26%    :1181           b74870f2  [.] 0x000000b74870f2
              |
              |--32.09%-- 0xb73b5b44
              |          0xb7487102
              |          0xb748a4e2
              |          0xb748633d
              |          0xb73b41cd
              |          0xb73b4467
              |          0xb747d531

The reason is: for existing process, in __cmd_record(),
the pid is 0 rather than the existing process id.

Signed-off-by: Austin Zhang <austin_zhang@...ux.intel.com>
---
 tools/perf/builtin-record.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 2654253..1d62d2a 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -552,7 +552,7 @@ static int __cmd_record(int argc, const char **argv)
 	}

 	if (!system_wide && profile_cpu == -1)
-		event__synthesize_thread(pid, process_synthesized_event,
+		event__synthesize_thread(target_pid, process_synthesized_event,
 					 session);
 	else
 		event__synthesize_threads(process_synthesized_event, session);
-- 
1.6.1.3

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