Messages in this thread Patch in this message | | | From | Milian Wolff <> | Subject | [PATCH v2] perf report: do not drop last inlined frame | Date | Thu, 18 May 2017 10:38:22 +0200 |
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The very last inlined frame, i.e. the one furthest away from the non-inlined frame, was silently dropped. This is apparent when comparing the output of `perf script` and `addr2line`:
~~~~~~ $ perf script --inline ... a.out 26722 80836.309329: 72425 cycles: 21493 __hypot_finite (/usr/lib/libm-2.25.so) a4a std::abs<double> (inline) (/tmp/a.out) a4a std::_Norm_helper<true>::_S_do_it<double> (inline) (/tmp/a.out) a4a std::norm<double> (inline) (/tmp/a.out) a4a main (/tmp/a.out) 20510 __libc_start_main (/usr/lib/libc-2.25.so) bd9 _start (/tmp/a.out)
$ addr2line -a -f -i -e /tmp/a.out a4a | c++filt 0x0000000000000a4a std::__complex_abs(doublecomplex ) /usr/include/c++/6.3.1/complex:589 double std::abs<double>(std::complex<double> const&) /usr/include/c++/6.3.1/complex:597 double std::_Norm_helper<true>::_S_do_it<double>(std::complex<double> const&) /usr/include/c++/6.3.1/complex:654 double std::norm<double>(std::complex<double> const&) /usr/include/c++/6.3.1/complex:664 main /tmp/inlining.cpp:14 ~~~~~
Note how `std::__complex_abs` is missing from the `perf script` output. This is similarly showing up in `perf report`. The patch here fixes this issue, and the output becomes:
~~~~~ a.out 26722 80836.309329: 72425 cycles: 21493 __hypot_finite (/usr/lib/libm-2.25.so) ace3 hypot (/usr/lib/libm-2.25.so) a4a std::__complex_abs (inline) (/tmp/a.out) a4a std::abs<double> (inline) (/tmp/a.out) a4a std::_Norm_helper<true>::_S_do_it<double> (inline) (/tmp/a.out) a4a std::norm<double> (inline) (/tmp/a.out) a4a main (/tmp/a.out) 20510 __libc_start_main (/usr/lib/libc-2.25.so) bd9 _start (/tmp/a.out) ~~~~~
Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Yao Jin <yao.jin@linux.intel.com> Signed-off-by: Milian Wolff <milian.wolff@kdab.com> --- tools/perf/util/srcline.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-)
v2: - rebase against patch fixing memleak in addr2lines
diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c index bbba9c69cfec..168285d37cd2 100644 --- a/tools/perf/util/srcline.c +++ b/tools/perf/util/srcline.c @@ -203,6 +203,16 @@ static void addr2line_cleanup(struct a2l_data *a2l) #define MAX_INLINE_NEST 1024 +static int inline_list__append_dso_a2l(struct dso *dso, + struct inline_node *node) +{ + struct a2l_data *a2l = dso->a2l; + char *funcname = a2l->funcname ? strdup(a2l->funcname) : NULL; + char *filename = a2l->filename ? strdup(a2l->filename) : NULL; + + return inline_list__append(filename, funcname, a2l->line, node, dso); +} + static int addr2line(const char *dso_name, u64 addr, char **file, unsigned int *line, struct dso *dso, bool unwind_inlines, struct inline_node *node) @@ -231,15 +241,15 @@ static int addr2line(const char *dso_name, u64 addr, if (unwind_inlines) { int cnt = 0; + if (node && inline_list__append_dso_a2l(dso, node)) + return 0; + while (bfd_find_inliner_info(a2l->abfd, &a2l->filename, &a2l->funcname, &a2l->line) && cnt++ < MAX_INLINE_NEST) { if (node != NULL) { - if (inline_list__append(strdup(a2l->filename), - strdup(a2l->funcname), - a2l->line, node, - dso) != 0) + if (inline_list__append_dso_a2l(dso, node)) return 0; // found at least one inline frame ret = 1; -- 2.13.0
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