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# Copyright (c) Meta Platforms, Inc. and affiliates.
# SPDX-License-Identifier: LGPL-2.1-or-later
from drgn.helpers.linux.cpumask import for_each_possible_cpu
from drgn.helpers.linux.percpu import (
per_cpu,
per_cpu_ptr,
percpu_counter_sum,
percpu_counter_sum_positive,
)
from tests.linux_kernel import LinuxKernelTestCase, prng32, skip_unless_have_test_kmod
class TestPerCpu(LinuxKernelTestCase):
def test_per_cpu(self):
for cpu in for_each_possible_cpu(self.prog):
rq = per_cpu(self.prog["runqueues"], cpu)
try:
rq_cpu = rq.cpu
except AttributeError:
# Before Linux kernel commit cac5cefbade9 ("sched/smp: Make SMP
# unconditional") (in v6.17), struct rq::cpu only exists if
# CONFIG_SMP=y, so check this instead.
self.assertEqual(rq.idle, self.prog["init_task"].address_of_())
else:
self.assertEqual(rq_cpu, cpu)
@skip_unless_have_test_kmod
def test_per_cpu_module_static(self):
for cpu, expected in zip(for_each_possible_cpu(self.prog), prng32("PCPU")):
self.assertEqual(
per_cpu(self.prog["drgn_test_percpu_static"], cpu), expected
)
@skip_unless_have_test_kmod
def test_per_cpu_module_dynamic(self):
for cpu, expected in zip(for_each_possible_cpu(self.prog), prng32("pcpu")):
self.assertEqual(
per_cpu_ptr(self.prog["drgn_test_percpu_dynamic"], cpu)[0], expected
)
@skip_unless_have_test_kmod
class TestPercpuCounter(LinuxKernelTestCase):
def test_percpu_counter_sum(self):
self.assertEqual(percpu_counter_sum(self.prog["drgn_test_percpu_counter"]), 13)
self.assertEqual(
percpu_counter_sum(self.prog["drgn_test_percpu_counter_negative"]), -66
)
def test_percpu_counter_sum_positive(self):
self.assertEqual(
percpu_counter_sum_positive(self.prog["drgn_test_percpu_counter"]), 13
)
self.assertEqual(
percpu_counter_sum_positive(self.prog["drgn_test_percpu_counter_negative"]),
0,
)
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