linux-kernel - [tip:perfcounters/core] perf record/report: Fix PID/COMM handling

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Date:	Thu, 4 Jun 2009 12:48:34 GMT
From:	tip-bot for Ingo Molnar <mingo@...e.hu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, paulus@...ba.org,
	hpa@...or.com, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	efault@....de, mtosatti@...hat.com, tglx@...utronix.de,
	cjashfor@...ux.vnet.ibm.com, mingo@...e.hu
Subject: [tip:perfcounters/core] perf record/report: Fix PID/COMM handling

Commit-ID:  df97992c6e25ffc66c549c8bc59262dc627c6d17
Gitweb:     http://git.kernel.org/tip/df97992c6e25ffc66c549c8bc59262dc627c6d17
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Thu, 4 Jun 2009 13:41:22 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 4 Jun 2009 13:41:37 +0200

perf record/report: Fix PID/COMM handling

Fix two bugs causing lost comm mappings:

 - initial PID is not 0 but getpid()

 - when we are unable to handle an mmap event, dont assume the event
   itself is broken - try to parse the stream. This way we wont lose
   comm events.

Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 Documentation/perf_counter/builtin-record.c |    2 +-
 Documentation/perf_counter/builtin-report.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/perf_counter/builtin-record.c b/Documentation/perf_counter/builtin-record.c
index efa2eb4..bf59df5 100644
--- a/Documentation/perf_counter/builtin-record.c
+++ b/Documentation/perf_counter/builtin-record.c
@@ -430,7 +430,7 @@ static int __cmd_record(int argc, const char **argv)
 	}
 
 	if (!system_wide) {
-		open_counters(-1, target_pid != -1 ? target_pid : 0);
+		open_counters(-1, target_pid != -1 ? target_pid : getpid());
 	} else for (i = 0; i < nr_cpus; i++)
 		open_counters(i, target_pid);
 
diff --git a/Documentation/perf_counter/builtin-report.c b/Documentation/perf_counter/builtin-report.c
index 86f23f0..ff6f657 100644
--- a/Documentation/perf_counter/builtin-report.c
+++ b/Documentation/perf_counter/builtin-report.c
@@ -852,7 +852,7 @@ process_mmap_event(event_t *event, unsigned long offset, unsigned long head)
 
 	if (thread == NULL || map == NULL) {
 		dprintf("problem processing PERF_EVENT_MMAP, skipping event.\n");
-		return -1;
+		return 0;
 	}
 
 	thread__insert_map(thread, map);
--
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