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perf libdw: 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/1452158050-28061-6-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2016-01-07 10:14:02 +01:00 committed by Arnaldo Carvalho de Melo
parent 0ddf5246f7
commit 0ba98149f8
1 changed files with 10 additions and 0 deletions
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10
tools/perf/util/unwind-libdw.c
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@ -95,6 +95,16 @@ static int access_dso_mem(struct unwind_info *ui, Dwarf_Addr addr,
thread__find_addr_map(ui->thread, PERF_RECORD_MISC_USER,
MAP__FUNCTION, addr, &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, addr, &al);
}
if (!al.map) {
pr_debug("unwind: no map for %lx\n", (unsigned long)addr);
return -1;