Messages in this thread Patch in this message | | | From | Arnaldo Carvalho de Melo <> | Subject | [PATCH 09/18] perf tools: Do backtrace post unwind only if we regs and stack were captured | Date | Tue, 11 Sep 2012 20:53:01 -0300 |
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From: Jiri Olsa <jolsa@redhat.com>
Bail out without error if we want to do backtrace post unwind, but were not able to capture user registers or user stack during the record phase, which is possible and valid case.
Signed-off-by: Jiri Olsa <jolsa@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1347295819-23177-2-git-send-email-jolsa@redhat.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/util/session.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 3806ea4..0ecd62b 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -388,6 +388,11 @@ int machine__resolve_callchain(struct machine *machine, (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER))) return 0; + /* Bail out if nothing was captured. */ + if ((!sample->user_regs.regs) || + (!sample->user_stack.size)) + return 0; + return unwind__get_entries(unwind_entry, &callchain_cursor, machine, thread, evsel->attr.sample_regs_user, sample); -- 1.7.9.2.358.g22243
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