bpf: Batch call_rcu callbacks instead of SLAB_TYPESAFE_BY_RCU.

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SLAB_TYPESAFE_BY_RCU makes kmem_caches non mergeable and slows down
kmem_cache_destroy. All bpf_mem_cache are safe to share across different maps
and programs. Convert SLAB_TYPESAFE_BY_RCU to batched call_rcu. This change
solves the memory consumption issue, avoids kmem_cache_destroy latency and
keeps bpf hash map performance the same.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220902211058.60789-10-alexei.starovoitov@gmail.com

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Alexei Starovoitov 2022-09-02 14:10:51 -07:00 • committed by Daniel Borkmann

parent 7c266178aa

commit 8d5a8011b3

2 changed files with 66 additions and 4 deletions

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65

kernel/bpf/memalloc.c

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5

kernel/bpf/syscall.c

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