def test_kedr_memleak_load_cas_module(module, unload_modules, install_kedr):
"""
title: Loading modules with kedr started with 'memleak' configuration
description: Load and unload modules with kedr started to watch for memory leaks
pass_criteria:
- No memory leaks observed after loading and unloading module
"""
with TestRun.step(f"Starting kedr against {module}"):
Kedr.start(module.value)
with TestRun.step(f"Loading {module}"):
os_utils.load_kernel_module(module.value)
with TestRun.step(f"Unloading {module}"):
os_utils.unload_kernel_module(module.value,
os_utils.ModuleRemoveMethod.modprobe)
with TestRun.step(f"Checking for memory leaks for {module}"):
try:
Kedr.check_for_mem_leaks(module.value)
except Exception as e:
TestRun.LOGGER.error(f"{e}")
with TestRun.step(f"Stopping kedr"):
Kedr.stop()
def test_insufficient_memory_for_cas_module():
"""
title: Negative test of ability to load OpenCAS kernel module with insufficient memory.
description: |
Check that OpenCAS kernel module won’t be loaded in case not enough memory is available.
pass_criteria:
- Loading OpenCAS kernel module returns error.
"""
with TestRun.step("Disable caching and memory over-committing."):
disable_memory_affecting_functions()
drop_caches()
with TestRun.step("Measure memory usage without OpenCAS module."):
if is_kernel_module_loaded(CasModule.cache.value):
unload_kernel_module(CasModule.cache.value)
unload_kernel_module(CasModule.disk.value)
available_mem_before_cas = get_free_memory()
with TestRun.step("Load OpenCAS module"):
output = load_kernel_module(CasModule.cache.value)
if output.exit_code != 0:
TestRun.fail("Cannot load OpenCAS module!")
with TestRun.step("Measure memory usage with OpenCAS module."):
available_mem_with_cas = get_free_memory()
memory_used_by_cas = available_mem_before_cas - available_mem_with_cas
TestRun.LOGGER.info(
f"OpenCAS module uses {memory_used_by_cas.get_value(Unit.MiB):.2f} MiB of DRAM."
)
with TestRun.step("Unload OpenCAS module."):
unload_kernel_module(CasModule.cache.value)
unload_kernel_module(CasModule.disk.value)
with TestRun.step("Allocate memory leaving not enough memory for OpenCAS module."):
memory_to_leave = memory_used_by_cas * (3 / 4)
try:
allocate_memory(get_free_memory() - memory_to_leave)
except Exception as ex:
TestRun.LOGGER.error(f"{ex}")
with TestRun.step(
"Try to load OpenCAS module and check if error message is printed on failure."
):
output = load_kernel_module(CasModule.cache.value)
if output.stderr and output.exit_code != 0:
memory_left = get_free_memory()
TestRun.LOGGER.info(
f"Memory left for OpenCAS module: {memory_left.get_value(Unit.MiB):0.2f} MiB."
)
TestRun.LOGGER.info(f"Cannot load OpenCAS module as expected.\n{output.stderr}")
else:
TestRun.LOGGER.error("Loading OpenCAS module successfully finished, but should fail.")
with TestRun.step("Set memory options to default"):
unmount_ramfs()
defaultize_memory_affecting_functions()
def unload_all_cas_modules():
os_utils.unload_kernel_module(CasModule.cache.value,
os_utils.ModuleRemoveMethod.rmmod)
os_utils.unload_kernel_module(CasModule.disk.value,
os_utils.ModuleRemoveMethod.rmmod)
def reload_all_cas_modules():
os_utils.unload_kernel_module(CasModule.cache.value, ModuleRemoveMethod.modprobe)
os_utils.load_kernel_module(CasModule.cache.value)
def teardown(self):
unload_output = os_utils.unload_kernel_module(self.module_name)
if unload_output.exit_code != 0 \
and "is not currently loaded" not in unload_output.stderr:
TestRun.LOGGER.info(
f"Failed to unload {self.module_name} module\n{unload_output}")
def teardown(self):
if os_utils.is_kernel_module_loaded(self.module_name):
os_utils.unload_kernel_module(self.module_name)