acec05060d
Change license to BSD-3-Clause Signed-off-by: Rafal Stefanowski <rafal.stefanowski@intel.com>
80 lines
3.2 KiB
Python
80 lines
3.2 KiB
Python
#
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# Copyright(c) 2020-2021 Intel Corporation
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# SPDX-License-Identifier: BSD-3-Clause
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#
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import pytest
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from api.cas.cas_module import CasModule
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from core.test_run import TestRun
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from test_utils.size import Unit
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from test_utils.os_utils import (allocate_memory,
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defaultize_memory_affecting_functions,
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disable_memory_affecting_functions,
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drop_caches,
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get_free_memory,
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is_kernel_module_loaded,
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load_kernel_module,
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unload_kernel_module,
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unmount_ramfs)
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@pytest.mark.os_dependent
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def test_insufficient_memory_for_cas_module():
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"""
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title: Negative test of ability to load OpenCAS kernel module with insufficient memory.
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description: |
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Check that OpenCAS kernel module won’t be loaded in case not enough memory is available.
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pass_criteria:
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- Loading OpenCAS kernel module returns error.
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"""
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with TestRun.step("Disable caching and memory over-committing."):
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disable_memory_affecting_functions()
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drop_caches()
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with TestRun.step("Measure memory usage without OpenCAS module."):
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if is_kernel_module_loaded(CasModule.cache.value):
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unload_kernel_module(CasModule.cache.value)
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unload_kernel_module(CasModule.disk.value)
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available_mem_before_cas = get_free_memory()
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with TestRun.step("Load OpenCAS module"):
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output = load_kernel_module(CasModule.cache.value)
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if output.exit_code != 0:
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TestRun.fail("Cannot load OpenCAS module!")
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with TestRun.step("Measure memory usage with OpenCAS module."):
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available_mem_with_cas = get_free_memory()
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memory_used_by_cas = available_mem_before_cas - available_mem_with_cas
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TestRun.LOGGER.info(
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f"OpenCAS module uses {memory_used_by_cas.get_value(Unit.MiB):.2f} MiB of DRAM."
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)
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with TestRun.step("Unload OpenCAS module."):
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unload_kernel_module(CasModule.cache.value)
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unload_kernel_module(CasModule.disk.value)
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with TestRun.step("Allocate memory leaving not enough memory for OpenCAS module."):
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memory_to_leave = memory_used_by_cas * (3 / 4)
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try:
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allocate_memory(get_free_memory() - memory_to_leave)
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except Exception as ex:
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TestRun.LOGGER.error(f"{ex}")
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with TestRun.step(
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"Try to load OpenCAS module and check if error message is printed on failure."
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):
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output = load_kernel_module(CasModule.cache.value)
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if output.stderr and output.exit_code != 0:
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memory_left = get_free_memory()
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TestRun.LOGGER.info(
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f"Memory left for OpenCAS module: {memory_left.get_value(Unit.MiB):0.2f} MiB."
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)
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TestRun.LOGGER.info(f"Cannot load OpenCAS module as expected.\n{output.stderr}")
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else:
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TestRun.LOGGER.error("Loading OpenCAS module successfully finished, but should fail.")
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with TestRun.step("Set memory options to default"):
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unmount_ramfs()
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defaultize_memory_affecting_functions()
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