linux-kernel - [PATCH 1/6] perf tools: Synthetize the targeted process

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Date:	Wed, 11 Nov 2009 04:51:02 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Subject: [PATCH 1/6] perf tools: Synthetize the targeted process

Don't forget to also synthetize the targeted process from perf record
or we'll miss its dso in the events and then we won't be able to deal
with its build-id.

We are missing it because it is created after the existing synthetized
tasks but before the counters are enabled and can send its mapping
event.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
---
 tools/perf/builtin-record.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index cf2cd25..2b45d33 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -497,13 +497,22 @@ static int __cmd_record(int argc, const char **argv)
 	if (target_pid == -1 && argc) {
 		pid = fork();
 		if (pid < 0)
-			perror("failed to fork");
+			die("failed to fork");
 
 		if (!pid) {
 			if (execvp(argv[0], (char **)argv)) {
 				perror(argv[0]);
 				exit(-1);
 			}
+		} else {
+			/*
+			 * Wait a bit for the execv'ed child to appear
+			 * and be updated in /proc
+			 * FIXME: Do you know a less heuristical solution?
+			 */
+			usleep(1000);
+			event__synthesize_thread(pid,
+						 process_synthesized_event);
 		}
 
 		child_pid = pid;
-- 
1.6.2.3

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