linux-kernel - [PATCH bpf-next v2 05/35] bpf: memcg-based memory accounting for cgroup storage maps

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Message-ID: <20200727184506.2279656-6-guro@fb.com>
Date:   Mon, 27 Jul 2020 11:44:36 -0700
From:   Roman Gushchin <guro@...com>
To:     <bpf@...r.kernel.org>
CC:     <netdev@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>,
        <linux-kernel@...r.kernel.org>, Roman Gushchin <guro@...com>
Subject: [PATCH bpf-next v2 05/35] bpf: memcg-based memory accounting for cgroup storage maps

Account memory used by cgroup storage maps including the percpu memory
for the percpu flavor of cgroup storage and map metadata.

Signed-off-by: Roman Gushchin <guro@...com>
---
 kernel/bpf/local_storage.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/kernel/bpf/local_storage.c b/kernel/bpf/local_storage.c
index 3b2c70197d78..117acb2e80fb 100644
--- a/kernel/bpf/local_storage.c
+++ b/kernel/bpf/local_storage.c
@@ -166,7 +166,8 @@ static int cgroup_storage_update_elem(struct bpf_map *map, void *key,
 
 	new = kmalloc_node(sizeof(struct bpf_storage_buffer) +
 			   map->value_size,
-			   __GFP_ZERO | GFP_ATOMIC | __GFP_NOWARN,
+			   __GFP_ZERO | GFP_ATOMIC | __GFP_NOWARN |
+			   __GFP_ACCOUNT,
 			   map->numa_node);
 	if (!new)
 		return -ENOMEM;
@@ -313,7 +314,7 @@ static struct bpf_map *cgroup_storage_map_alloc(union bpf_attr *attr)
 		return ERR_PTR(ret);
 
 	map = kmalloc_node(sizeof(struct bpf_cgroup_storage_map),
-			   __GFP_ZERO | GFP_USER, numa_node);
+			   __GFP_ZERO | GFP_USER | __GFP_ACCOUNT, numa_node);
 	if (!map) {
 		bpf_map_charge_finish(&mem);
 		return ERR_PTR(-ENOMEM);
@@ -496,9 +497,9 @@ static size_t bpf_cgroup_storage_calculate_size(struct bpf_map *map, u32 *pages)
 struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog,
 					enum bpf_cgroup_storage_type stype)
 {
+	const gfp_t gfp = __GFP_ZERO | GFP_USER | __GFP_ACCOUNT;
 	struct bpf_cgroup_storage *storage;
 	struct bpf_map *map;
-	gfp_t flags;
 	size_t size;
 	u32 pages;
 
@@ -511,20 +512,18 @@ struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog,
 	if (bpf_map_charge_memlock(map, pages))
 		return ERR_PTR(-EPERM);
 
-	storage = kmalloc_node(sizeof(struct bpf_cgroup_storage),
-			       __GFP_ZERO | GFP_USER, map->numa_node);
+	storage = kmalloc_node(sizeof(struct bpf_cgroup_storage), gfp,
+			       map->numa_node);
 	if (!storage)
 		goto enomem;
 
-	flags = __GFP_ZERO | GFP_USER;
-
 	if (stype == BPF_CGROUP_STORAGE_SHARED) {
-		storage->buf = kmalloc_node(size, flags, map->numa_node);
+		storage->buf = kmalloc_node(size, gfp, map->numa_node);
 		if (!storage->buf)
 			goto enomem;
 		check_and_init_map_lock(map, storage->buf->data);
 	} else {
-		storage->percpu_buf = __alloc_percpu_gfp(size, 8, flags);
+		storage->percpu_buf = __alloc_percpu_gfp(size, 8, gfp);
 		if (!storage->percpu_buf)
 			goto enomem;
 	}
-- 
2.26.2