Commit 6a0e55d8 authored Aug 30, 2011 by Anton Blanchard Committed by Arnaldo Carvalho de Melo Sep 23, 2011

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>

parent 764e16a3

tools/perf/util/event.c

+5 −0

Original line number	Original line	Diff line number	Diff line
	@@ -169,12 +169,17 @@ static int perf_event__synthesize_mmap_events(union perf_event *event,
	continue;		continue;
	pbf += n + 3;		pbf += n + 3;
	if (pbf == 'x') { / vm_exec */		if (pbf == 'x') { / vm_exec */
			char anonstr[] = "//anon\n";
	char *execname = strchr(bf, '/');		char *execname = strchr(bf, '/');

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

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

	if (execname == NULL)		if (execname == NULL)
	continue;		continue;