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bpf: lpm_trie memory usage

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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: Yafang Shao <laoar.shao@gmail.com>
Link: https://lore.kernel.org/r/20230305124615.12358-3-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yafang Shao 2023-03-05 12:45:59 +00:00 committed by Alexei Starovoitov
parent 90a5527d76
commit 41d5941e7f
1 changed files with 11 additions and 0 deletions
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11
kernel/bpf/lpm_trie.c
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@ -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],
};