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bpf: use bpf_map_kvcalloc in bpf_local_storage

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Introduce new helper bpf_map_kvcalloc() for the memory allocation in
bpf_local_storage(). Then the allocation will charge the memory from the
map instead of from current, though currently they are the same thing as
it is only used in map creation path now. By charging map's memory into
the memcg from the map, it will be more clear.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Link: https://lore.kernel.org/r/20230210154734.4416-3-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yafang Shao 2023-02-10 15:47:32 +00:00 committed by Alexei Starovoitov
parent b6c1a8af5b
commit ddef81b5fd
3 changed files with 25 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

8
include/linux/bpf.h
View file

@ -1886,6 +1886,8 @@ struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
int node);
void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
gfp_t flags);
void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
size_t align, gfp_t flags);
#else
@ -1902,6 +1904,12 @@ bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
return kzalloc(size, flags);
}
static inline void *
bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size, gfp_t flags)
{
return kvcalloc(n, size, flags);
}
static inline void __percpu *
bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
gfp_t flags)

4
kernel/bpf/bpf_local_storage.c
View file

@ -568,8 +568,8 @@ static struct bpf_local_storage_map *__bpf_local_storage_map_alloc(union bpf_att
nbuckets = max_t(u32, 2, nbuckets);
smap->bucket_log = ilog2(nbuckets);
smap->buckets = kvcalloc(sizeof(*smap->buckets), nbuckets,
GFP_USER | __GFP_NOWARN | __GFP_ACCOUNT);
smap->buckets = bpf_map_kvcalloc(&smap->map, sizeof(*smap->buckets),
nbuckets, GFP_USER | __GFP_NOWARN);
if (!smap->buckets) {
bpf_map_area_free(smap);
return ERR_PTR(-ENOMEM);

15
kernel/bpf/syscall.c
View file

@ -464,6 +464,21 @@ void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
return ptr;
}
void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
gfp_t flags)
{
struct mem_cgroup *memcg, *old_memcg;
void *ptr;
memcg = bpf_map_get_memcg(map);
old_memcg = set_active_memcg(memcg);
ptr = kvcalloc(n, size, flags | __GFP_ACCOUNT);
set_active_memcg(old_memcg);
mem_cgroup_put(memcg);
return ptr;
}
void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
size_t align, gfp_t flags)
{