Commit 0ddf5246 authored Jan 07, 2016 by Jiri Olsa Committed by Arnaldo Carvalho de Melo Jan 08, 2016

perf unwind: Check for mmaps also in MAP__VARIABLE tree



We've seen cases (softice) where DWARF unwinder went through non
executable mmaps, which we need to lookup in MAP__VARIABLE tree.

Reported-and-Tested-by: Noel Grandin <noelgrandin@gmail.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1452158050-28061-5-git-send-email-jolsa@kernel.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent f22ed827

tools/perf/util/unwind-libunwind.c

+9 −0

Original line number	Original line	Diff line number	Diff line
	@@ -319,6 +319,15 @@ static struct map find_map(unw_word_t ip, struct unwind_info ui)

	thread__find_addr_map(ui->thread, PERF_RECORD_MISC_USER,		thread__find_addr_map(ui->thread, PERF_RECORD_MISC_USER,
	MAP__FUNCTION, ip, &al);		MAP__FUNCTION, ip, &al);
			if (!al.map) {
			/*
			* We've seen cases (softice) where DWARF unwinder went
			* through non executable mmaps, which we need to lookup
			* in MAP__VARIABLE tree.
			*/
			thread__find_addr_map(ui->thread, PERF_RECORD_MISC_USER,
			MAP__VARIABLE, ip, &al);
			}
	return al.map;		return al.map;
	}		}