Perf profiling without frame pointers doesn't show the Python functions on the Linux 6.18.0 kernel #139544
Description
Bug report
Bug description:
When trying to use Perf without frame pointers on the latest kernel 6.18.0-0.rc0 the Python functions are not shown in the Perf output.
After compiling with a simple ./configure && make
Using:
def foo(n):
result = 0
for _ in range(n):
result += 1
return result
def bar(n):
foo(n)
def baz(n):
bar(n)
if __name__ == "__main__":
baz(1000000)
$ perf record -F 9999 -g -k 1 --call-graph dwarf -o perf.data ./python -Xperf_jit script.py
$ perf inject -i perf.data --jit --output perf.jit.data
$ perf report -g -i perf.jit.data
Outputs:
python jitted-6004-170.so [.] py::BufferedIncrementalDecoder.init:
python jitted-6004-171.so [.] py::BufferedIncrementalDecoder.init:
python jitted-6004-172.so [.] py::BufferedIncrementalDecoder.init:
python jitted-6004-173.so [.] py::BufferedIncrementalDecoder.init:
Instead of e.g:
python jitted-329740-171.so [.] py:::/home/user/dev/cpython/script.py
python jitted-329740-172.so [.] py::baz:/home/user/dev/cpython/script.py
python jitted-329740-173.so [.] py::bar:/home/user/dev/cpython/script.py
python jitted-329740-174.so [.] py::foo:/home/user/dev/cpython/script.py
The kernel version 6.16.8 works fine. Haven't tested the 6.17 one.
Reproduced on the Fedora Rawhide x86_64 buildbot and also on aarch64.
CPython versions tested on:
3.14, 3.13
Operating systems tested on:
Linux