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# Copyright (c) Meta Platforms, Inc. and affiliates.
# SPDX-License-Identifier: LGPL-2.1-or-later
import re
from drgn.helpers.linux.vmstat import (
global_numa_event_state,
global_vm_event_state,
nr_free_pages,
)
from tests.linux_kernel import LinuxKernelTestCase, meminfo_field_in_pages
class TestVmstat(LinuxKernelTestCase):
def test_nr_free_pages(self):
self.assertAlmostEqual(
nr_free_pages(self.prog),
meminfo_field_in_pages("MemFree"),
delta=1024 * 1024 * 1024,
)
def test_global_numa_event_state(self):
with open("/proc/vmstat", "r") as f:
for line in f:
match = re.match(r"numa_hit\s+([0-9]+)", line)
if match:
expected = int(match.group(1))
break
else:
self.skipTest("kernel does not support NUMA statistics")
self.assertAlmostEqual(
global_numa_event_state(self.prog["NUMA_HIT"]), expected, delta=1024 * 1024
)
def test_global_vm_event_state(self):
with open("/proc/vmstat", "r") as f:
for line in f:
match = re.match(r"pgmajfault\s+([0-9]+)", line)
if match:
expected = int(match.group(1))
break
else:
self.skipTest("kernel does not support VM event statistics")
self.assertAlmostEqual(
global_vm_event_state(self.prog["PGMAJFAULT"]), expected, delta=1024 * 1024
)
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