From eeb4084466d3e6df7d1681cb7f4ff20041360bb1 Mon Sep 17 00:00:00 2001 From: Artem Savkov Date: Mon, 10 Jul 2023 15:13:51 +0200 Subject: [PATCH] bpf: local_storage memory usage Bugzilla: https://bugzilla.redhat.com/2221599 commit 2f536977d6f1481f0a149140c8311103ddebe36a Author: Yafang Shao Date: Sun Mar 5 12:46:10 2023 +0000 bpf: local_storage memory usage A new helper is introduced to calculate local_storage map memory usage. Currently the dynamically allocated elements are not counted, since it will take runtime overhead in the element update or delete path. So let's put it aside currently, and implement it in the future if the user really needs it. Signed-off-by: Yafang Shao Link: https://lore.kernel.org/r/20230305124615.12358-14-laoar.shao@gmail.com Signed-off-by: Alexei Starovoitov Signed-off-by: Artem Savkov --- kernel/bpf/local_storage.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/bpf/local_storage.c b/kernel/bpf/local_storage.c index e90d9f63edc5..a993560f200a 100644 --- a/kernel/bpf/local_storage.c +++ b/kernel/bpf/local_storage.c @@ -446,6 +446,12 @@ static void cgroup_storage_seq_show_elem(struct bpf_map *map, void *key, rcu_read_unlock(); } +static u64 cgroup_storage_map_usage(const struct bpf_map *map) +{ + /* Currently the dynamically allocated elements are not counted. */ + return sizeof(struct bpf_cgroup_storage_map); +} + BTF_ID_LIST_SINGLE(cgroup_storage_map_btf_ids, struct, bpf_cgroup_storage_map) const struct bpf_map_ops cgroup_storage_map_ops = { @@ -457,6 +463,7 @@ const struct bpf_map_ops cgroup_storage_map_ops = { .map_delete_elem = cgroup_storage_delete_elem, .map_check_btf = cgroup_storage_check_btf, .map_seq_show_elem = cgroup_storage_seq_show_elem, + .map_mem_usage = cgroup_storage_map_usage, .map_btf_id = &cgroup_storage_map_btf_ids[0], };