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| author | Yafang Shao <laoar.shao@gmail.com> | 2023-02-10 18:47:33 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-02-11 05:59:57 +0300 |
| commit | ee53cbfb1ebf990de0d084a7cd6b67b05fe1f7ac (patch) | |
| tree | 84caf90a458c9dbead8cb0c2fcdf0dc75d8a5a1f /kernel/bpf | |
| parent | ddef81b5fd1da4d7c3cc8785d2043b73b72f38ef (diff) | |
| download | linux-ee53cbfb1ebf990de0d084a7cd6b67b05fe1f7ac.tar.xz | |
bpf: allow to disable bpf map memory accounting
We can simply set root memcg as the map's memcg to disable bpf memory
accounting. bpf_map_area_alloc is a little special as it gets the memcg
from current rather than from the map, so we need to disable GFP_ACCOUNT
specifically for it.
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/20230210154734.4416-4-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf')
| -rw-r--r-- | kernel/bpf/memalloc.c | 3 | ||||
| -rw-r--r-- | kernel/bpf/syscall.c | 5 |
2 files changed, 5 insertions, 3 deletions
diff --git a/kernel/bpf/memalloc.c b/kernel/bpf/memalloc.c index 1db156405b68..490d03a4581a 100644 --- a/kernel/bpf/memalloc.c +++ b/kernel/bpf/memalloc.c @@ -395,7 +395,8 @@ int bpf_mem_alloc_init(struct bpf_mem_alloc *ma, int size, bool percpu) unit_size = size; #ifdef CONFIG_MEMCG_KMEM - objcg = get_obj_cgroup_from_current(); + if (memcg_bpf_enabled()) + objcg = get_obj_cgroup_from_current(); #endif for_each_possible_cpu(cpu) { c = per_cpu_ptr(pc, cpu); diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 9d94a35d8b0f..cda8d00f3762 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -309,7 +309,7 @@ static void *__bpf_map_area_alloc(u64 size, int numa_node, bool mmapable) * __GFP_RETRY_MAYFAIL to avoid such situations. */ - const gfp_t gfp = __GFP_NOWARN | __GFP_ZERO | __GFP_ACCOUNT; + gfp_t gfp = bpf_memcg_flags(__GFP_NOWARN | __GFP_ZERO); unsigned int flags = 0; unsigned long align = 1; void *area; @@ -418,7 +418,8 @@ static void bpf_map_save_memcg(struct bpf_map *map) * So we have to check map->objcg for being NULL each time it's * being used. */ - map->objcg = get_obj_cgroup_from_current(); + if (memcg_bpf_enabled()) + map->objcg = get_obj_cgroup_from_current(); } static void bpf_map_release_memcg(struct bpf_map *map) |