• csrc/storage_manager/bitmap.cpp
  • Added implementation for a Bitmap class, providing core bit manipulation functionalities like set, clear, test, popcount, clz, clo, bitwise AND, and string conversion.
• csrc/storage_manager/bitmap.h
  • Added the header file for the Bitmap class, defining its public interface and documentation.
• csrc/storage_manager/pybind.cpp
  • Modified to include and expose the new Bitmap class to Python via pybind11, making its methods accessible from Python.
• lmcache/native_storage_ops.pyi
  • Updated type hints to include the newly exposed Bitmap class and its methods.
• lmcache/v1/distributed/config.py
  • Imported L2 adapter configuration utilities.
  • Added l2_adapter_config to StorageManagerConfig.
  • Integrated add_l2_adapters_args and parse_args_to_l2_adapters_config for command-line argument parsing related to L2 adapters.
• lmcache/v1/distributed/l2_adapters/base.py
  • Added a new file defining the L2AdapterInterface abstract base class, outlining the required methods for L2 storage interaction.
• lmcache/v1/distributed/l2_adapters/config.py
  • Added a new file for L2 adapter configuration, including a registry for adapter types, a base config class, and a specific MockL2AdapterConfig.
  • Provided utilities to add and parse L2 adapter arguments from the command line.
• lmcache/v1/distributed/l2_adapters/mock_l2_adapter.py
  • Added a new file implementing MockL2Adapter, a CPU RAM-based L2 adapter for testing, complete with simulated bandwidth, FIFO eviction, and object locking.
• setup.py
  • Modified to include csrc/storage_manager/bitmap.cpp in the storage_manager_sources for both CUDA and ROCm extensions, ensuring proper compilation.
• tests/v1/distributed/init.py
  • Added an empty __init__.py file to establish tests/v1/distributed as a Python package.
• tests/v1/distributed/test_mock_l2_adapter.py
  • Added comprehensive unit tests for the MockL2Adapter, covering its event FD interfaces, store, lookup/lock, unlock, load operations, end-to-end workflows, close functionality, and bandwidth simulation.
• tests/v1/native_storage_ops/test_bitmap.py
  • Added unit tests for the Bitmap class, verifying its core functionalities and edge cases, especially for non-multiple-of-8 sizes.

• The pull request introduces the L2AdapterInterface to standardize how L2 storage interacts with the system.
• A MockL2Adapter is implemented to facilitate testing of L2 storage mechanisms without requiring actual hardware.
• A Bitmap C++ utility, exposed to Python, is added to efficiently manage and track success/failure states for batched L2 operations.
• Configuration for L2 adapters is integrated, allowing them to be specified and parsed via command-line arguments.
• New unit tests have been added for both the Bitmap class and the MockL2Adapter, ensuring the reliability and correctness of these new components.

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