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authorJiri Olsa <jolsa@kernel.org>2017-07-04 16:11:31 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-07-04 17:43:58 +0300
commit1934adf78e33fa69570a763c7ac5353212416bb0 (patch)
tree37cd8ee72a944b4ef9ba5dc115ea2eea4a189844 /tools/perf
parent97365e81366f5ca16a9ce66cff4dd4c5b0d9f4db (diff)
downloadlinux-1934adf78e33fa69570a763c7ac5353212416bb0.tar.xz
perf unwind: Do not fail due to missing unwind support
We currently fail the MMAP event processing if we don't have the MMAP event's specific arch unwind support compiled in. That's wrong and can lead to unresolved mmaps in report output for 32bit binaries on 64bit server, like in this example on x86_64 server: $ cat ex.c int main(int argc, char **argv) { while (1) {} } $ gcc -o ex -m32 ex.c $ perf record ./ex ^C[ perf record: Woken up 2 times to write data ] [ perf record: Captured and wrote 0.371 MB perf.data (9322 samples) ] Before: $ perf report --stdio SNIP # Overhead Command Shared Object Symbol # ........ ....... ................ ...................... # 100.00% ex [unknown] [.] 0x00000000080483de 0.00% ex [unknown] [.] 0x00000000f76dba4f 0.00% ex [unknown] [.] 0x00000000f76e4c11 0.00% ex [unknown] [.] 0x00000000f76daa30 After: $ perf report --stdio SNIP # Overhead Command Shared Object Symbol # ........ ....... ............. ............... # 100.00% ex ex [.] main 0.00% ex ld-2.24.so [.] _dl_start 0.00% ex ld-2.24.so [.] do_lookup_x 0.00% ex ld-2.24.so [.] _start The fix is not to fail, just warn if there's not unwind support compiled in. Reported-by: Michael Lyle <mlyle@lyle.org> Signed-off-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: He Kuang <hekuang@huawei.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20170704131131.27508-1-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/util/unwind-libunwind.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
index 6d542a4e0648..8aef572d0889 100644
--- a/tools/perf/util/unwind-libunwind.c
+++ b/tools/perf/util/unwind-libunwind.c
@@ -50,7 +50,7 @@ int unwind__prepare_access(struct thread *thread, struct map *map,
if (!ops) {
pr_err("unwind: target platform=%s is not supported\n", arch);
- return -1;
+ return 0;
}
out_register:
unwind__register_ops(thread, ops);