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authorAnton Blanchard <anton@samba.org>2011-08-30 09:15:06 +1000
committerArnaldo Carvalho de Melo <acme@redhat.com>2011-09-23 14:37:06 -0300
commit6a0e55d85babfccfd976703852ec8bab388b3a10 (patch)
tree965a6075c05d2600c50508b1dba4a0a7c5606614 /tools
parent764e16a30a77a9c8346fbae6615e7c818ce9d00f (diff)
downloadlinux-6a0e55d85babfccfd976703852ec8bab388b3a10.tar.bz2
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')
-rw-r--r--tools/perf/util/event.c5
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;