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Andrii Nakryiko
379d5ee624
Alexei Starovoitov says: ==================== bpf: range_tree for bpf arena From: Alexei Starovoitov <ast@kernel.org> Introduce range_tree (interval tree plus rbtree) to track unallocated ranges in bpf arena and replace maple_tree with it. This is a step towards making bpf_arena|free_alloc_pages non-sleepable. The previous approach to reuse drm_mm to replace maple_tree reached dead end, since sizeof(struct drm_mm_node) = 168 and sizeof(struct maple_node) = 256 while sizeof(struct range_node) = 64 introduced in this patch. Not only it's smaller, but the algorithm splits and merges adjacent ranges. Ultimate performance doesn't matter. The main objective of range_tree is to work in context where kmalloc/kfree are not safe. It achieves that via bpf_mem_alloc. ==================== Link: https://patch.msgid.link/20241108025616.17625-1-alexei.starovoitov@gmail.com Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Linux kernel
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