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bpf: queue_stack_maps memory usage

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

Yafang Shao committed 3 years ago

Commit c6e66b41 parent fa5e83d1 file · +10 −0Browse files

Showing the changes to kernel/bpf/queue_stack_maps.c (1 of 1 file). Show all

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kernel/bpf/queue_stack_maps.c+10−0
@@ -246,6 +246,14 @@ static int queue_stack_map_get_next_key(struct bpf_map *map, void *key, · 245 unmodified lines
246246 return -EINVAL;
247247 }
248248
249+static u64 queue_stack_map_mem_usage(const struct bpf_map *map)
250+{
251+ u64 usage = sizeof(struct bpf_queue_stack);
252+
253+ usage += ((u64)map->max_entries + 1) * map->value_size;
254+ return usage;
255+}
256+
249257 BTF_ID_LIST_SINGLE(queue_map_btf_ids, struct, bpf_queue_stack)
250258 const struct bpf_map_ops queue_map_ops = {
251259 .map_meta_equal = bpf_map_meta_equal,
@@ -259,6 +267,7 @@ const struct bpf_map_ops queue_map_ops = { · 7 unmodified lines
259267 .map_pop_elem = queue_map_pop_elem,
260268 .map_peek_elem = queue_map_peek_elem,
261269 .map_get_next_key = queue_stack_map_get_next_key,
270+ .map_mem_usage = queue_stack_map_mem_usage,
262271 .map_btf_id = &queue_map_btf_ids[0],
263272 };
264273
@@ -274,5 +283,6 @@ const struct bpf_map_ops stack_map_ops = { · 9 unmodified lines
274283 .map_pop_elem = stack_map_pop_elem,
275284 .map_peek_elem = stack_map_peek_elem,
276285 .map_get_next_key = queue_stack_map_get_next_key,
286+ .map_mem_usage = queue_stack_map_mem_usage,
277287 .map_btf_id = &queue_map_btf_ids[0],
278288 };