Commit 41d5941e authored by Yafang Shao's avatar Yafang Shao Committed by Alexei Starovoitov
Browse files

bpf: lpm_trie memory usage 



trie_mem_usage() is introduced to calculate the lpm_trie memory usage.
Some small memory allocations are ignored. The inner node is also
ignored.

The result as follows,

- before
10: lpm_trie  flags 0x1
        key 8B  value 8B  max_entries 65536  memlock 1048576B

- after
10: lpm_trie  flags 0x1
        key 8B  value 8B  max_entries 65536  memlock 2291536B

Signed-off-by: default avatarYafang Shao <laoar.shao@gmail.com>
Link: https://lore.kernel.org/r/20230305124615.12358-3-laoar.shao@gmail.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 90a5527d

kernel/bpf/lpm_trie.c

+11 −0
Original line number Diff line number Diff line
@@ -720,6 +720,16 @@ static int trie_check_btf(const struct bpf_map *map, 
	       -EINVAL : 0;

}



static u64 trie_mem_usage(const struct bpf_map *map)

{

	struct lpm_trie *trie = container_of(map, struct lpm_trie, map);

	u64 elem_size;



	elem_size = sizeof(struct lpm_trie_node) + trie->data_size +

			    trie->map.value_size;

	return elem_size * READ_ONCE(trie->n_entries);

}



BTF_ID_LIST_SINGLE(trie_map_btf_ids, struct, lpm_trie)

const struct bpf_map_ops trie_map_ops = {

	.map_meta_equal = bpf_map_meta_equal,
@@ -733,5 +743,6 @@ const struct bpf_map_ops trie_map_ops = { 
	.map_update_batch = generic_map_update_batch,

	.map_delete_batch = generic_map_delete_batch,

	.map_check_btf = trie_check_btf,

	.map_mem_usage = trie_mem_usage,

	.map_btf_id = &trie_map_btf_ids[0],

};