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| author |   Yafang Shao <laoar.shao@gmail.com> | 2023-03-05 12:46:11 +0000 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2023-03-07 09:33:43 -0800 |
| commit | 7490b7f1c02ef825ef98f7230662049d4a464a21 (patch) | |
| tree | b94f3d6e0f8a61e29a91a517dfd050f3df9ae6d9 /kernel/bpf/bpf_local_storage.c | |
| parent | bpf: local_storage memory usage (diff) | |
| download | wireguard-linux-7490b7f1c02ef825ef98f7230662049d4a464a21.tar.xz wireguard-linux-7490b7f1c02ef825ef98f7230662049d4a464a21.zip | |
bpf, net: bpf_local_storage memory usage
A new helper is introduced into bpf_local_storage map to calculate the
memory usage. This helper is also used by other maps like
bpf_cgrp_storage, bpf_inode_storage, bpf_task_storage and etc.
Note that currently the dynamically allocated storage elements are not
counted in the usage, since it will take extra runtime overhead in the
elements update or delete path. So let's put it aside now, and implement
it in the future when someone really need it.
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Link: https://lore.kernel.org/r/20230305124615.12358-15-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf/bpf_local_storage.c')
| -rw-r--r-- | kernel/bpf/bpf_local_storage.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/bpf/bpf_local_storage.c b/kernel/bpf/bpf_local_storage.c index 3d320393a12c..d3ba3f2db640 100644 --- a/kernel/bpf/bpf_local_storage.c +++ b/kernel/bpf/bpf_local_storage.c @@ -685,6 +685,16 @@ bool bpf_local_storage_unlink_nolock(struct bpf_local_storage *local_storage) return free_storage; } +u64 bpf_local_storage_map_mem_usage(const struct bpf_map *map) +{ + struct bpf_local_storage_map *smap = (struct bpf_local_storage_map *)map; + u64 usage = sizeof(*smap); + + /* The dynamically callocated selems are not counted currently. */ + usage += sizeof(*smap->buckets) * (1ULL << smap->bucket_log); + return usage; +} + struct bpf_map * bpf_local_storage_map_alloc(union bpf_attr *attr, struct bpf_local_storage_cache *cache) |