From: SeongJae Park <sjpark@xxxxxxxxx> Currently, DAMON[1] supports only virtual memory address spaces because it utilizes PTE Accessed bits as its low-level access check primitive and ``struct vma`` as a way to address the monitoring target regions. However, the core idea of DAMON, which makes it able to provide the accurate, efficient, and scalable monitoring, is in a separate higher layer. Therefore, DAMON can be extended for other various address spaces by changing the two low primitives to others for the address spaces. This patchset makes the DAMON's low level primitives configurable and provide reference implementation of the primitives for the virtual memory address spaces and the physical memory address space. Therefore, users can monitor both of the two address spaces by simply configuring the provided low level primitives. Note that only the user memory is supported, as same to the idle page access tracking feature. After this patchset, the programming interface users can implement the primitives by themselves for their special use cases. Clean/dirty/entire page cache, NUMA nodes, specific files, or block devices would be examples of such special use cases. [1] https://lore.kernel.org/linux-mm/20200608114047.26589-1-sjpark@xxxxxxxxxx/ Baseline and Complete Git Trees =============================== The patches are based on the v5.7 plus DAMON v15 patchset[1] and DAMOS RFC v11 patchset[2]. You can also clone the complete git tree: $ git clone git://github.com/sjp38/linux -b cdamon/rfc/v3 The web is also available: https://github.com/sjp38/linux/releases/tag/cdamon/rfc/v3 [1] https://lore.kernel.org/linux-mm/20200608114047.26589-1-sjpark@xxxxxxxxxx/ [2] https://lore.kernel.org/linux-mm/20200609065320.12941-1-sjpark@xxxxxxxxxx/ Sequence of Patches =================== The sequence of patches is as follow. The 1st patch defines the monitoring region again based on pure address range abstraction so that no assumption of virtual memory is in there. The 2nd patch allows users to configure the low level pritimives for initialization and dynamic update of the target address regions, which were previously coupled with the virtual memory. Then, the 3rd and 4th patches allow user space to also be able to set the monitoring target regions via the debugfs and the user space tool. The 5th patch documents this feature. The 6th patch makes the access check primitives, which were coupled with the virtual memory address, freely configurable. Now any address space can be supported. The 7th patch provides the reference implementations of the configurable primitives for the physical memory monitoring. The 8th and 9th patch makes the user space to be able to use the physical memory monitoring via debugfs and the user space tool, respectively. Finally, the 10th patch documents the physical memory monitoring support. Patch History ============= Changes from RFC v2 (https://lore.kernel.org/linux-mm/20200603141135.10575-1-sjpark@xxxxxxxxxx/) - Support the physical memory monitoring with the user space tool - Use 'pfn_to_online_page()' (David Hildenbrand) - Document more detail on random 'pfn' and its safeness (David Hildenbrand) Changes from RFC v1 (https://lore.kernel.org/linux-mm/20200409094232.29680-1-sjpark@xxxxxxxxxx/) - Provide the reference primitive implementations for the physical memory - Connect the extensions with the debugfs interface SeongJae Park (10): mm/damon: Use vm-independent address range concept mm/damon: Make monitoring target regions init/update configurable mm/damon/debugfs: Allow users to set initial monitoring target regions tools/damon: Implement init target regions feature Docs/damon: Document 'initial_regions' feature mm/damon: Make access check primitive configurable mm/damon: Implement callbacks for physical memory monitoring mm/damon/debugfs: Support physical memory monitoring tools/damon/record: Support physical memory address spce Docs/damon: Document physical memory monitoring support Documentation/admin-guide/mm/damon/faq.rst | 16 +- Documentation/admin-guide/mm/damon/index.rst | 1 - .../admin-guide/mm/damon/mechanisms.rst | 4 +- Documentation/admin-guide/mm/damon/plans.rst | 29 - Documentation/admin-guide/mm/damon/usage.rst | 73 ++- include/linux/damon.h | 47 +- include/trace/events/damon.h | 4 +- mm/damon-test.h | 78 +-- mm/damon.c | 518 +++++++++++++++--- tools/damon/_damon.py | 41 ++ tools/damon/heats.py | 2 +- tools/damon/record.py | 41 +- tools/damon/schemes.py | 12 +- 13 files changed, 690 insertions(+), 176 deletions(-) delete mode 100644 Documentation/admin-guide/mm/damon/plans.rst -- 2.17.1
