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bpf: queue_stack_maps memory usage

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A new helper is introduced to calculate queue_stack_maps memory usage.

The result as follows,

- before
20: queue  name count_map  flags 0x0
        key 0B  value 4B  max_entries 65536  memlock 266240B
21: stack  name count_map  flags 0x0
        key 0B  value 4B  max_entries 65536  memlock 266240B

- after
20: queue  name count_map  flags 0x0
        key 0B  value 4B  max_entries 65536  memlock 524288B
21: stack  name count_map  flags 0x0
        key 0B  value 4B  max_entries 65536  memlock 524288B

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Link: https://lore.kernel.org/r/20230305124615.12358-12-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yafang Shao 2023-03-05 12:46:08 +00:00 committed by Alexei Starovoitov
parent fa5e83df17
commit c6e66b42a3
1 changed files with 10 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

10
kernel/bpf/queue_stack_maps.c
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@ -246,6 +246,14 @@ static int queue_stack_map_get_next_key(struct bpf_map *map, void *key,
return -EINVAL;
}
static u64 queue_stack_map_mem_usage(const struct bpf_map *map)
{
u64 usage = sizeof(struct bpf_queue_stack);
usage += ((u64)map->max_entries + 1) * map->value_size;
return usage;
}
BTF_ID_LIST_SINGLE(queue_map_btf_ids, struct, bpf_queue_stack)
const struct bpf_map_ops queue_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
@ -259,6 +267,7 @@ const struct bpf_map_ops queue_map_ops = {
.map_pop_elem = queue_map_pop_elem,
.map_peek_elem = queue_map_peek_elem,
.map_get_next_key = queue_stack_map_get_next_key,
.map_mem_usage = queue_stack_map_mem_usage,
.map_btf_id = &queue_map_btf_ids[0],
};
@ -274,5 +283,6 @@ const struct bpf_map_ops stack_map_ops = {
.map_pop_elem = stack_map_pop_elem,
.map_peek_elem = stack_map_peek_elem,
.map_get_next_key = queue_stack_map_get_next_key,
.map_mem_usage = queue_stack_map_mem_usage,
.map_btf_id = &queue_map_btf_ids[0],
};