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import os
import importlib.util
from glob import glob
class KernelNotFoundError(Exception):
def __init__(self):
kernel_version = os.uname().release
flavor = kernel_version.split("-", 2)[2]
super().__init__(
f"\nWARNING: python perf module not found for kernel {kernel_version}\n\n"
f" You may need to install the following package for this specific kernel:\n"
f" linux-tools-{kernel_version}\n\n"
f" You may also want to install the following package to keep up to date:\n"
f" linux-tools-{flavor}"
)
# Load the actual python-perf module for the running kernel
_kernel_version = os.uname().release
_perf_dir = f"/usr/lib/linux-tools/{_kernel_version}/lib"
if not os.path.exists(_perf_dir):
_abi_version = "-".join(_kernel_version.split("-")[0:2])
_perf_dir = f"/usr/lib/python3/dist-packages/linux-tools-{_abi_version}"
if not os.path.exists(_perf_dir):
raise KernelNotFoundError()
_perf_lib = glob(os.path.join(_perf_dir, "perf.*.so"))[-1]
_spec = importlib.util.spec_from_file_location("perf", _perf_lib)
_perf = importlib.util.module_from_spec(_spec)
_spec.loader.exec_module(_perf)
# Expose the 'perf' module.
__all__ = ["perf"]