proto_memory.h

 1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2#ifndef _PROTO_MEMORY_H
 3#define _PROTO_MEMORY_H
 4
 5#include <net/sock.h>
 6#include <net/hotdata.h>
 7
 8/* 1 MB per cpu, in page units */
 9#define SK_MEMORY_PCPU_RESERVE (1 << (20 - PAGE_SHIFT))
10
11static inline bool sk_has_memory_pressure(const struct sock *sk)
12{
13	return sk->sk_prot->memory_pressure != NULL;
14}
15
16static inline bool
17proto_memory_pressure(const struct proto *prot)
18{
19	if (!prot->memory_pressure)
20		return false;
21	return !!READ_ONCE(*prot->memory_pressure);
22}
23
24static inline bool sk_under_global_memory_pressure(const struct sock *sk)
25{
26	return proto_memory_pressure(sk->sk_prot);
27}
28
29static inline bool sk_under_memory_pressure(const struct sock *sk)
30{
31	if (!sk->sk_prot->memory_pressure)
32		return false;
33
34	if (mem_cgroup_sk_enabled(sk) &&
35	    mem_cgroup_sk_under_memory_pressure(sk))
36		return true;
37
38	if (sk->sk_bypass_prot_mem)
39		return false;
40
41	return !!READ_ONCE(*sk->sk_prot->memory_pressure);
42}
43
44static inline long
45proto_memory_allocated(const struct proto *prot)
46{
47	return max(0L, atomic_long_read(prot->memory_allocated));
48}
49
50static inline long
51sk_memory_allocated(const struct sock *sk)
52{
53	return proto_memory_allocated(sk->sk_prot);
54}
55
56static inline void proto_memory_pcpu_drain(struct proto *proto)
57{
58	int val = this_cpu_xchg(*proto->per_cpu_fw_alloc, 0);
59
60	if (val)
61		atomic_long_add(val, proto->memory_allocated);
62}
63
64static inline void
65sk_memory_allocated_add(const struct sock *sk, int val)
66{
67	struct proto *proto = sk->sk_prot;
68
69	val = this_cpu_add_return(*proto->per_cpu_fw_alloc, val);
70
71	if (unlikely(val >= READ_ONCE(net_hotdata.sysctl_mem_pcpu_rsv)))
72		proto_memory_pcpu_drain(proto);
73}
74
75static inline void
76sk_memory_allocated_sub(const struct sock *sk, int val)
77{
78	struct proto *proto = sk->sk_prot;
79
80	val = this_cpu_sub_return(*proto->per_cpu_fw_alloc, val);
81
82	if (unlikely(val <= -READ_ONCE(net_hotdata.sysctl_mem_pcpu_rsv)))
83		proto_memory_pcpu_drain(proto);
84}
85
86#endif /* _PROTO_MEMORY_H */