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perf symbols: Synthesize anonymous mmap events

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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>
This commit is contained in:
Anton Blanchard 2011-08-30 09:15:06 +10:00 committed by Arnaldo Carvalho de Melo
parent 764e16a30a
commit 6a0e55d85b
1 changed files with 5 additions and 0 deletions
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5
tools/perf/util/event.c
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@ -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;