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From:   Roman Gushchin <guro@fb.com>
To:     <bpf@vger.kernel.org>
CC:     <ast@kernel.org>, <daniel@iogearbox.net>, <netdev@vger.kernel.org>,
        <andrii@kernel.org>, <akpm@linux-foundation.org>,
        <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>,
        <kernel-team@fb.com>
Subject: [PATCH bpf-next v9 21/34] bpf: eliminate rlimit-based memory accounting for cgroup storage maps
Date:   Tue, 1 Dec 2020 13:58:47 -0800
Message-ID: <20201201215900.3569844-22-guro@fb.com>
In-Reply-To: <20201201215900.3569844-1-guro@fb.com>
References: <20201201215900.3569844-1-guro@fb.com>
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Do not use rlimit-based memory accounting for cgroup storage maps.
It has been replaced with the memcg-based memory accounting.

Signed-off-by: Roman Gushchin <guro@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
---
 kernel/bpf/local_storage.c | 21 +--------------------
 1 file changed, 1 insertion(+), 20 deletions(-)

diff --git a/kernel/bpf/local_storage.c b/kernel/bpf/local_storage.c
index 74dcee8926e5..2d4f9ac12377 100644
--- a/kernel/bpf/local_storage.c
+++ b/kernel/bpf/local_storage.c
@@ -287,8 +287,6 @@ static struct bpf_map *cgroup_storage_map_alloc(union=
 bpf_attr *attr)
 {
 	int numa_node =3D bpf_map_attr_numa_node(attr);
 	struct bpf_cgroup_storage_map *map;
-	struct bpf_map_memory mem;
-	int ret;
=20
 	if (attr->key_size !=3D sizeof(struct bpf_cgroup_storage_key) &&
 	    attr->key_size !=3D sizeof(__u64))
@@ -308,18 +306,10 @@ static struct bpf_map *cgroup_storage_map_alloc(uni=
on bpf_attr *attr)
 		/* max_entries is not used and enforced to be 0 */
 		return ERR_PTR(-EINVAL);
=20
-	ret =3D bpf_map_charge_init(&mem, sizeof(struct bpf_cgroup_storage_map)=
);
-	if (ret < 0)
-		return ERR_PTR(ret);
-
 	map =3D kmalloc_node(sizeof(struct bpf_cgroup_storage_map),
 			   __GFP_ZERO | GFP_USER | __GFP_ACCOUNT, numa_node);
-	if (!map) {
-		bpf_map_charge_finish(&mem);
+	if (!map)
 		return ERR_PTR(-ENOMEM);
-	}
-
-	bpf_map_charge_move(&map->map.memory, &mem);
=20
 	/* copy mandatory map attributes */
 	bpf_map_init_from_attr(&map->map, attr);
@@ -508,9 +498,6 @@ struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(s=
truct bpf_prog *prog,
=20
 	size =3D bpf_cgroup_storage_calculate_size(map, &pages);
=20
-	if (bpf_map_charge_memlock(map, pages))
-		return ERR_PTR(-EPERM);
-
 	storage =3D bpf_map_kmalloc_node(map, sizeof(struct bpf_cgroup_storage)=
,
 				       gfp, map->numa_node);
 	if (!storage)
@@ -533,7 +520,6 @@ struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(s=
truct bpf_prog *prog,
 	return storage;
=20
 enomem:
-	bpf_map_uncharge_memlock(map, pages);
 	kfree(storage);
 	return ERR_PTR(-ENOMEM);
 }
@@ -560,16 +546,11 @@ void bpf_cgroup_storage_free(struct bpf_cgroup_stor=
age *storage)
 {
 	enum bpf_cgroup_storage_type stype;
 	struct bpf_map *map;
-	u32 pages;
=20
 	if (!storage)
 		return;
=20
 	map =3D &storage->map->map;
-
-	bpf_cgroup_storage_calculate_size(map, &pages);
-	bpf_map_uncharge_memlock(map, pages);
-
 	stype =3D cgroup_storage_type(map);
 	if (stype =3D=3D BPF_CGROUP_STORAGE_SHARED)
 		call_rcu(&storage->rcu, free_shared_cgroup_storage_rcu);
--=20
2.26.2