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1279c14f17
Add a userspace filtering tool for page_owner that supports per-fd filtering with print_mode and NUMA node filters. Features: - Three print modes: stack (default), handle, stack_handle - NUMA node filtering with flexible formats (single: 0, multiple: 0,1,2, range: 0-3, mixed: 0,2-3) - Per-file-descriptor filter state for independent filtering Usage examples: # Filter by print mode ./page_owner_filter -m handle ./page_owner_filter -m stack_handle # Filter by NUMA node ./page_owner_filter -n 0 ./page_owner_filter -n 0-3 # Combined filters ./page_owner_filter -m stack -n 0,1,2 ./page_owner_filter -m handle -n 0,2-3 The tool validates inputs before sending commands to the kernel and provides clear error messages when the kernel does not support per-fd filtering. Link: https://lore.kernel.org/20260707115411.1714314-4-zhen.ni@easystack.cn Signed-off-by: Zhen Ni <zhen.ni@easystack.cn> Tested-by: Zi Yan <ziy@nvidia.com> Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org> Acked-by: Zi Yan <ziy@nvidia.com> Cc: Brendan Jackman <jackmanb@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Suren Baghdasaryan <surenb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>