On Tue, May 17, 2022 at 8:51 PM Dave Marchevsky <davemarchevsky@xxxxxx> wrote:
> maps increases, though.
>
> Note that the test programs need to split task_storage_get calls across
> multiple programs to work around the verifier's MAX_USED_MAPS
> limitations.
...
> +++ b/tools/testing/selftests/bpf/progs/local_storage_bench.h
> @@ -0,0 +1,69 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
> +
> +struct {
> + __uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
> + __uint(max_entries, 1000);
> + __type(key, int);
> + __type(value, int);
> +} array_of_maps SEC(".maps");
> +
> +long important_hits;
> +long hits;
> +
> +#ifdef LOOKUP_HASHMAP
> +static int do_lookup(unsigned int elem, struct task_struct *task /* unused */)
> +{
> + void *map;
> + int zero = 0;
> +
> + map = bpf_map_lookup_elem(&array_of_maps, &elem);
> + if (!map)
> + return -1;
> +
> + bpf_map_lookup_elem(map, &zero);
> + __sync_add_and_fetch(&hits, 1);
> + if (!elem)
> + __sync_add_and_fetch(&important_hits, 1);
> + return 0;
> +}
This prog accesses only two maps: array_of_maps and global data
(hidden array map).
Where do you see it's reaching MAX_USED_MAPS limit ?
