[PATCH 07/12] perf symbols: Synthesize anonymous mmap events

Arnaldo Carvalho de Melo
2011-09-23T20:29:25Z

From: Anton Blanchard <anton@samba.org>

perf_event__synthesize_mmap_events does not create anonymous mmap events
even though the kernel does. As a result an already running application
with dynamically created code will not get profiled - all samples end up
in the unknown bucket.

This patch skips any entries with '[' in the name to avoid adding events
for special regions (eg the vsyscall page). All other executable mmaps
are assumed to be anonymous and an event is synthesized.

Acked-by: Pekka Enberg <penberg@kernel.org>
Cc: Eric B Munson <emunson@mgebm.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Link: http://lkml.kernel.org/r/20110830091506.60b51fe8@kryten
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/event.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 3c1b8a6..437f8ca 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -169,12 +169,17 @@ static int perf_event__synthesize_mmap_events(union perf_event *event,
continue;
pbf += n + 3;
if (*pbf == 'x') { /* vm_exec */
+ char anonstr[] = "//anon\n";
char *execname = strchr(bf, '/');

/* Catch VDSO */
if (execname == NULL)
execname = strstr(bf, "[vdso]");

+ /* Catch anonymous mmaps */
+ if ((execname == NULL) && !strstr(bf, "["))
+ execname = anonstr;
+
if (execname == NULL)
continue;

--
1.6.2.5