gh-121608: Add supporting perf trampoline on -linux-musl

[corona10]

• Issue: support perf trampoline on -linux-musl #121608

[corona10]

@pablogsal I think that there is no harm in adding support for musl.

[pablogsal]

@pablogsal I think that there is no harm in adding support for musl.

I am a bit hessitant because we don't have CI for this. Have we tried it at least in a musl container or system and check that works?

[pablogsal]

LGTM but see my comment

[corona10]

I am a bit hessitant because we don't have CI for this. Have we tried it at least in a musl container or system and check that works?

I will share the result of cross-check from my side before merging this.

[corona10]

@pablogsal See my verification script. :)

main

Dockerfile

FROM alpine:latest

# install build dependencies and needed tools
RUN apk add \
    wget \
    git \
    gcc \
    make \
    perf \
    zlib-dev \
    libffi-dev \
    openssl-dev \
    musl-dev


RUN cd /opt && git clone https://github.com/python/cpython.git
RUN cd /opt/cpython && ./configure && make -j8 && ./python -m test test_perf_profiler -v

Output

0:00:00 load avg: 6.37 Run 1 test sequentially in a single process
0:00:00 load avg: 6.37 [1/1] test_perf_profiler
test_perf_profiler skipped -- perf trampoline profiling not supported
test_perf_profiler skipped

== Tests result: SUCCESS ==

1 test skipped:
    test_perf_profiler

Total duration: 65 ms
Total tests: run=0
Total test files: run=1/1 skipped=1
Result: SUCCESS

PR

Dockerfile

FROM alpine:latest

# install build dependencies and needed tools
RUN apk add \
    wget \
    git \
    gcc \
    make \
    perf \
    zlib-dev \
    libffi-dev \
    openssl-dev \
    musl-dev


RUN cd /opt && git clone https://github.com/corona10/cpython.git
RUN cd /opt/cpython && git checkout gh-121608 && ./configure && make -j8 && ./python -m test test_perf_profiler -v

Output

0:00:00 load avg: 6.55 Run 1 test sequentially in a single process
0:00:00 load avg: 6.55 [1/1] test_perf_profiler
test_pre_fork_compile (test.test_perf_profiler.TestPerfProfiler.test_pre_fork_compile) ... skipped "perf command doesn't work"
test_python_calls_appear_in_the_stack_if_perf_activated (test.test_perf_profiler.TestPerfProfiler.test_python_calls_appear_in_the_stack_if_perf_activated) ... skipped "perf command doesn't work"
test_python_calls_do_not_appear_in_the_stack_if_perf_deactivated (test.test_perf_profiler.TestPerfProfiler.test_python_calls_do_not_appear_in_the_stack_if_perf_deactivated) ... skipped "perf command doesn't work"
test_python_calls_appear_in_the_stack_if_perf_activated (test.test_perf_profiler.TestPerfProfilerWithDwarf.test_python_calls_appear_in_the_stack_if_perf_activated) ... skipped "perf command doesn't work"
test_python_calls_do_not_appear_in_the_stack_if_perf_deactivated (test.test_perf_profiler.TestPerfProfilerWithDwarf.test_python_calls_do_not_appear_in_the_stack_if_perf_deactivated) ... skipped "perf command doesn't work"
test_sys_api (test.test_perf_profiler.TestPerfTrampoline.test_sys_api) ... ok
test_sys_api_get_status (test.test_perf_profiler.TestPerfTrampoline.test_sys_api_get_status) ... ok
test_sys_api_with_existing_trampoline (test.test_perf_profiler.TestPerfTrampoline.test_sys_api_with_existing_trampoline) ... ok
test_sys_api_with_invalid_trampoline (test.test_perf_profiler.TestPerfTrampoline.test_sys_api_with_invalid_trampoline) ... ok
test_trampoline_works (test.test_perf_profiler.TestPerfTrampoline.test_trampoline_works) ... ok
test_trampoline_works_with_forks (test.test_perf_profiler.TestPerfTrampoline.test_trampoline_works_with_forks) ... ok

----------------------------------------------------------------------
Ran 11 tests in 0.245s

OK (skipped=5)

== Tests result: SUCCESS ==

1 test OK.

Total duration: 453 ms
Total tests: run=11 skipped=5
Total test files: run=1/1
Result: SUCCESS
COMMIT
--> 9f33d8c1b2ec
9f33d8c1b2ecc190f5c9bd3af27b7a402877ba45983043ade8afea0367e58391

[pablogsal]

We still have:

test_python_calls_appear_in_the_stack_if_perf_activated (test.test_perf_profiler.TestPerfProfiler.test_python_calls_appear_in_the_stack_if_perf_activated) ... skipped "perf command doesn't work"
test_python_calls_do_not_appear_in_the_stack_if_perf_deactivated (test.test_perf_profiler.TestPerfProfiler.test_python_calls_do_not_appear_in_the_stack_if_perf_deactivated) ... skipped "perf command doesn't work"
test_python_calls_appear_in_the_stack_if_perf_activated (test.test_perf_profiler.TestPerfProfilerWithDwarf.test_python_calls_appear_in_the_stack_if_perf_activated) ... skipped "perf command doesn't work"
test_python_calls_do_not_appear_in_the_stack_if_perf_deactivated (test.test_perf_profiler.TestPerfProfilerWithDwarf.test_python_calls_do_not_appear_in_the_stack_if_perf_deactivated) ... skipped "perf command doesn't work"

so this is still not testing the perf DWARF integration because the kernel/perf version it's too old or has a bug. Check https://docs.python.org/3.14/howto/perf_profiling.html#how-to-work-without-frame-pointers

[corona10]

so this is still not testing the perf DWARF integration because the kernel/perf version it's too old or has a bug. Check

STEP 3/5: RUN perf version
perf version 6.6.4

Yeah.. Thanks for catching this. let me check.

[zware]

!buildbot Alpine

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @zware for commit b8573ea 🤖

The command will test the builders whose names match following regular expression: Alpine

The builders matched are:

• AMD64 Alpine Linux PR

[zware]

!buildbot Alpine

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @zware for commit b8573ea 🤖

The command will test the builders whose names match following regular expression: Alpine

The builders matched are:

• AMD64 Alpine Linux PR

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @pablogsal for commit b8573ea 🤖

If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again.

[github-actions]

This PR is stale because it has been open for 30 days with no activity.

[vstinner]

I closed this PR. I merged the more recent #152774 which sets also PERF_TRAMPOLINE_OBJ in configure.