bpf: Introduce range_tree data structure and use it in bpf arena

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Introduce range_tree data structure and use it in bpf arena to track
ranges of allocated pages. range_tree is a large bitmap that is
implemented as interval tree plus rbtree. The contiguous sequence of
bits represents unallocated pages.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/bpf/20241108025616.17625-2-alexei.starovoitov@gmail.com

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Alexei Starovoitov 2024-11-07 18:56:15 -08:00 • committed by Andrii Nakryiko

parent 8714381703

commit b795379757

4 changed files with 304 additions and 15 deletions

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2

kernel/bpf/Makefile

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34

kernel/bpf/arena.c

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262

kernel/bpf/range_tree.c

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21

kernel/bpf/range_tree.h

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