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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 v8 29/34] bpf: eliminate rlimit-based memory accounting for stackmap maps
Date:   Tue, 24 Nov 2020 19:01:14 -0800
Message-ID: <20201125030119.2864302-30-guro@fb.com>
In-Reply-To: <20201125030119.2864302-1-guro@fb.com>
References: <20201125030119.2864302-1-guro@fb.com>
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Do not use rlimit-based memory accounting for stackmap 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/stackmap.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index 06065fa27124..3325add8e629 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -90,7 +90,6 @@ static struct bpf_map *stack_map_alloc(union bpf_attr *=
attr)
 {
 	u32 value_size =3D attr->value_size;
 	struct bpf_stack_map *smap;
-	struct bpf_map_memory mem;
 	u64 cost, n_buckets;
 	int err;
=20
@@ -119,15 +118,9 @@ static struct bpf_map *stack_map_alloc(union bpf_att=
r *attr)
=20
 	cost =3D n_buckets * sizeof(struct stack_map_bucket *) + sizeof(*smap);
 	cost +=3D n_buckets * (value_size + sizeof(struct stack_map_bucket));
-	err =3D bpf_map_charge_init(&mem, cost);
-	if (err)
-		return ERR_PTR(err);
-
 	smap =3D bpf_map_area_alloc(cost, bpf_map_attr_numa_node(attr));
-	if (!smap) {
-		bpf_map_charge_finish(&mem);
+	if (!smap)
 		return ERR_PTR(-ENOMEM);
-	}
=20
 	bpf_map_init_from_attr(&smap->map, attr);
 	smap->map.value_size =3D value_size;
@@ -135,20 +128,17 @@ static struct bpf_map *stack_map_alloc(union bpf_at=
tr *attr)
=20
 	err =3D get_callchain_buffers(sysctl_perf_event_max_stack);
 	if (err)
-		goto free_charge;
+		goto free_smap;
=20
 	err =3D prealloc_elems_and_freelist(smap);
 	if (err)
 		goto put_buffers;
=20
-	bpf_map_charge_move(&smap->map.memory, &mem);
-
 	return &smap->map;
=20
 put_buffers:
 	put_callchain_buffers();
-free_charge:
-	bpf_map_charge_finish(&mem);
+free_smap:
 	bpf_map_area_free(smap);
 	return ERR_PTR(err);
 }
--=20
2.26.2