diff options
| author | Anton Blanchard <anton@samba.org> | 2011-08-30 09:15:06 +1000 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2011-09-23 14:37:06 -0300 |
| commit | 6a0e55d85babfccfd976703852ec8bab388b3a10 (patch) | |
| tree | 965a6075c05d2600c50508b1dba4a0a7c5606614 /tools/perf/util/event.c | |
| parent | 764e16a30a77a9c8346fbae6615e7c818ce9d00f (diff) | |
| download | lwn-6a0e55d85babfccfd976703852ec8bab388b3a10.tar.gz lwn-6a0e55d85babfccfd976703852ec8bab388b3a10.zip | |
perf symbols: Synthesize anonymous mmap events
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>
Diffstat (limited to 'tools/perf/util/event.c')
| -rw-r--r-- | 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 3c1b8a632101..437f8ca679a0 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; |