Commit 71a49abe authored by Yafang Shao's avatar Yafang Shao Committed by Alexei Starovoitov
Browse files

bpf: bloom_filter memory usage 



Introduce a new helper to calculate the bloom_filter memory usage.

The result as follows,
- before
16: bloom_filter  flags 0x0
        key 0B  value 8B  max_entries 65536  memlock 524288B

- after
16: bloom_filter  flags 0x0
        key 0B  value 8B  max_entries 65536  memlock 65856B

Signed-off-by: default avatarYafang Shao <laoar.shao@gmail.com>
Link: https://lore.kernel.org/r/20230305124615.12358-9-laoar.shao@gmail.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 2f7e4ab2

kernel/bpf/bloom_filter.c

+12 −0
Original line number Diff line number Diff line
@@ -193,6 +193,17 @@ static int bloom_map_check_btf(const struct bpf_map *map, 
	return btf_type_is_void(key_type) ? 0 : -EINVAL;

}



static u64 bloom_map_mem_usage(const struct bpf_map *map)

{

	struct bpf_bloom_filter *bloom;

	u64 bitset_bytes;



	bloom = container_of(map, struct bpf_bloom_filter, map);

	bitset_bytes = BITS_TO_BYTES((u64)bloom->bitset_mask + 1);

	bitset_bytes = roundup(bitset_bytes, sizeof(unsigned long));

	return sizeof(*bloom) + bitset_bytes;

}



BTF_ID_LIST_SINGLE(bpf_bloom_map_btf_ids, struct, bpf_bloom_filter)

const struct bpf_map_ops bloom_filter_map_ops = {

	.map_meta_equal = bpf_map_meta_equal,
@@ -206,5 +217,6 @@ const struct bpf_map_ops bloom_filter_map_ops = { 
	.map_update_elem = bloom_map_update_elem,

	.map_delete_elem = bloom_map_delete_elem,

	.map_check_btf = bloom_map_check_btf,

	.map_mem_usage = bloom_map_mem_usage,

	.map_btf_id = &bpf_bloom_map_btf_ids[0],

};