hi,
as reported by Milian, currently for DWARF unwind (both libdw
and libunwind) we display callchain in callee order only.
Adding the support to follow callchain order setup to libunwind
DWARF unwinder, so we could get following output for report:
$ perf record --call-graph dwarf ls
...
$ perf report --no-children --stdio
39.26% ls libc-2.21.so [.] __strcoll_l
|
---__strcoll_l
mpsort_with_tmp
mpsort_with_tmp
sort_files
main
__libc_start_main
_start
0
$ perf report -g caller --no-children --stdio
...
39.26% ls libc-2.21.so [.] __strcoll_l
|
---0
_start
__libc_start_main
main
sort_files
mpsort_with_tmp
mpsort_with_tmp
__strcoll_l
Tested on x86_64. The change is in generic code only,
so it should not affect other archs. Still it would be
nice to have some confirmation.. Wang Nan? ;-)
It'd be nice to have this for libdw unwind as well,
but it looks like it's out of reach for perf code.. Jan?
Also available in:
git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
perf/callchain_1
thanks,
jirka
Cc: Jan Kratochvil <jkrat...@redhat.com>
---
Jiri Olsa (3):
perf tools: Move initial entry call into get_entries function
perf tools: Add callchain order support for libunwind DWARF unwinder
perf test: Add callchain order setup for DWARF unwinder test
tools/perf/tests/dwarf-unwind.c | 22 +++++++++++++++++++---
tools/perf/util/unwind-libunwind.c | 60
+++++++++++++++++++++++++++++++++++++++---------------------
2 files changed, 58 insertions(+), 24 deletions(-)
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