Linux kernel mirror (for testing)
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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 */