gh-152769: Enable perf trampoline on Alpine

[weixlu]

Proposal of change

As mentioned in #152769, perf can‘t collect Python function-level hotspot info on Alpine Linux because perf trampoline support is not enabled there.

The trampoline is a CPU-architecture-specific feature and has little to do with OS or libc. Therefore, we can simply modify configure to reuse the same trampoline implementation as glibc.

Test results

I ran the tests on the following three platforms:

• Alpine 3.22.4, musl 1.2.5, x86_64 (matching the buildbot env)
• Alpine edge, musl 1.2.6, x86_64 (latest version)
• Alpine 3.22.4, musl 1.2.5, aarch64 (specifically ARMv9 Neoverse N2)

The three profiling-related tests now pass on all of these platforms:

test_perf_profiler
test_perfmaps
test_samply_profiler

Before this PR, these tests were skipped.

I also manually collected profiling data with perf and confirmed that Python-level functions appear in the profiling output.

How to reproduce

1. When running Alpine in a container, note that the container needs to be started with the additional --privileged option.

2. Apart from build dependencies, install perf and samply. samply needs to be built with Rust:

apk add perf rust cargo
export PATH="$HOME/.cargo/bin:$PATH"
cargo install --locked samply

3. Run the tests:

./python -m test test_perf_profiler test_perfmaps test_samply_profiler

4. To manually check profiling data, refer to the scripts described in Lack of perf support on Alpine Linux #152769.

• Issue: Lack of perf support on Alpine Linux #152769

[weixlu]

@vstinner Hi, this is the PR fixing perf trampolines on musl. Could you please take a look?