70 lines
2.7 KiB
Python
70 lines
2.7 KiB
Python
#
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# Copyright(c) 2020-2021 Intel Corporation
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# Copyright(c) 2024 Huawei Technologies Co., Ltd.
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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 types.size import Unit
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from test_utils.os_utils import (allocate_memory,
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disable_memory_affecting_functions,
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drop_caches,
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get_mem_free,
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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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)
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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 for the ability of CAS to load the kernel module with insufficient memory.
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description: |
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Check that the CAS kernel module won’t be loaded if enough memory is not available
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pass_criteria:
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- CAS module cannot be loaded with not enough memory.
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- Loading CAS with not enough memory 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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available_mem_before_cas = get_mem_free()
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with TestRun.step("Load CAS module"):
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load_kernel_module(CasModule.cache.value)
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with TestRun.step("Measure memory usage with CAS module"):
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available_mem_with_cas = get_mem_free()
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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 CAS module"):
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unload_kernel_module(CasModule.cache.value)
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with TestRun.step("Allocate memory, leaving not enough memory for CAS module"):
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memory_to_leave = get_mem_free() - (memory_used_by_cas * (3 / 4))
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allocate_memory(memory_to_leave)
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TestRun.LOGGER.info(
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f"Memory left for OpenCAS module: {get_mem_free().get_value(Unit.MiB):0.2f} MiB."
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)
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with TestRun.step(
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"Try to load OpenCAS module and check if correct 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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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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