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bpf: arraymap memory usage

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Introduce array_map_mem_usage() to calculate arraymap memory usage. In
this helper, some small memory allocations are ignored, like the
allocation of struct bpf_array_aux in prog_array. The inner_map_meta in
array_of_map is also ignored.

The result as follows,

- before
11: array  name count_map  flags 0x0
        key 4B  value 4B  max_entries 65536  memlock 524288B
12: percpu_array  name count_map  flags 0x0
        key 4B  value 4B  max_entries 65536  memlock 8912896B
13: perf_event_array  name count_map  flags 0x0
        key 4B  value 4B  max_entries 65536  memlock 524288B
14: prog_array  name count_map  flags 0x0
        key 4B  value 4B  max_entries 65536  memlock 524288B
15: cgroup_array  name count_map  flags 0x0
        key 4B  value 4B  max_entries 65536  memlock 524288B

- after
11: array  name count_map  flags 0x0
        key 4B  value 4B  max_entries 65536  memlock 524608B
12: percpu_array  name count_map  flags 0x0
        key 4B  value 4B  max_entries 65536  memlock 17301824B
13: perf_event_array  name count_map  flags 0x0
        key 4B  value 4B  max_entries 65536  memlock 524608B
14: prog_array  name count_map  flags 0x0
        key 4B  value 4B  max_entries 65536  memlock 524608B
15: cgroup_array  name count_map  flags 0x0
        key 4B  value 4B  max_entries 65536  memlock 524608B

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Link: https://lore.kernel.org/r/20230305124615.12358-5-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yafang Shao 2023-03-05 12:46:01 +00:00 committed by Alexei Starovoitov
parent 304849a27b
commit 1746d0555a
1 changed files with 28 additions and 0 deletions
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28
kernel/bpf/arraymap.c
View file

@ -721,6 +721,28 @@ static int bpf_for_each_array_elem(struct bpf_map *map, bpf_callback_t callback_
return num_elems;
}
static u64 array_map_mem_usage(const struct bpf_map *map)
{
struct bpf_array *array = container_of(map, struct bpf_array, map);
bool percpu = map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY;
u32 elem_size = array->elem_size;
u64 entries = map->max_entries;
u64 usage = sizeof(*array);
if (percpu) {
usage += entries * sizeof(void *);
usage += entries * elem_size * num_possible_cpus();
} else {
if (map->map_flags & BPF_F_MMAPABLE) {
usage = PAGE_ALIGN(usage);
usage += PAGE_ALIGN(entries * elem_size);
} else {
usage += entries * elem_size;
}
}
return usage;
}
BTF_ID_LIST_SINGLE(array_map_btf_ids, struct, bpf_array)
const struct bpf_map_ops array_map_ops = {
.map_meta_equal = array_map_meta_equal,
@ -742,6 +764,7 @@ const struct bpf_map_ops array_map_ops = {
.map_update_batch = generic_map_update_batch,
.map_set_for_each_callback_args = map_set_for_each_callback_args,
.map_for_each_callback = bpf_for_each_array_elem,
.map_mem_usage = array_map_mem_usage,
.map_btf_id = &array_map_btf_ids[0],
.iter_seq_info = &iter_seq_info,
};
@ -762,6 +785,7 @@ const struct bpf_map_ops percpu_array_map_ops = {
.map_update_batch = generic_map_update_batch,
.map_set_for_each_callback_args = map_set_for_each_callback_args,
.map_for_each_callback = bpf_for_each_array_elem,
.map_mem_usage = array_map_mem_usage,
.map_btf_id = &array_map_btf_ids[0],
.iter_seq_info = &iter_seq_info,
};
@ -1156,6 +1180,7 @@ const struct bpf_map_ops prog_array_map_ops = {
.map_fd_sys_lookup_elem = prog_fd_array_sys_lookup_elem,
.map_release_uref = prog_array_map_clear,
.map_seq_show_elem = prog_array_map_seq_show_elem,
.map_mem_usage = array_map_mem_usage,
.map_btf_id = &array_map_btf_ids[0],
};
@ -1257,6 +1282,7 @@ const struct bpf_map_ops perf_event_array_map_ops = {
.map_fd_put_ptr = perf_event_fd_array_put_ptr,
.map_release = perf_event_fd_array_release,
.map_check_btf = map_check_no_btf,
.map_mem_usage = array_map_mem_usage,
.map_btf_id = &array_map_btf_ids[0],
};
@ -1291,6 +1317,7 @@ const struct bpf_map_ops cgroup_array_map_ops = {
.map_fd_get_ptr = cgroup_fd_array_get_ptr,
.map_fd_put_ptr = cgroup_fd_array_put_ptr,
.map_check_btf = map_check_no_btf,
.map_mem_usage = array_map_mem_usage,
.map_btf_id = &array_map_btf_ids[0],
};
#endif
@ -1379,5 +1406,6 @@ const struct bpf_map_ops array_of_maps_map_ops = {
.map_lookup_batch = generic_map_lookup_batch,
.map_update_batch = generic_map_update_batch,
.map_check_btf = map_check_no_btf,
.map_mem_usage = array_map_mem_usage,
.map_btf_id = &array_map_btf_ids[0],
};