[PATCH bpf-next v2 3/4] bpf: allow to disable bpf map memory accounting

[Yafang Shao <laoar.shao@gmail.com>]

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>
---
 include/linux/bpf.h   | 8 ++++++++
 kernel/bpf/memalloc.c | 3 ++-
 kernel/bpf/syscall.c  | 5 +++--
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index fe0bf48..4385418 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -28,6 +28,7 @@
 #include <linux/btf.h>
 #include <linux/rcupdate_trace.h>
 #include <linux/static_call.h>
+#include <linux/memcontrol.h>
 
 struct bpf_verifier_env;
 struct bpf_verifier_log;
@@ -2933,4 +2934,11 @@ static inline bool type_is_alloc(u32 type)
 	return type & MEM_ALLOC;
 }
 
+static inline gfp_t bpf_memcg_flags(gfp_t flags)
+{
+	if (memcg_bpf_enabled())
+		return flags | __GFP_ACCOUNT;
+	return flags;
+}
+
 #endif /* _LINUX_BPF_H */
diff --git a/kernel/bpf/memalloc.c b/kernel/bpf/memalloc.c
index ebcc3dd..6da9051 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 9d94a35..cda8d00 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)
-- 
1.8.3.1