include/net/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
  11 static inline bool sk_has_memory_pressure(const struct sock *sk)
  12 {
  13         return sk->sk_prot->memory_pressure != NULL;
  14 }
  15
  16 static inline bool
  17 proto_memory_pressure(const struct proto *prot)
  18 {
  19         if (!prot->memory_pressure)
  20                 return false;
  21         return !!READ_ONCE(*prot->memory_pressure);
  22 }
  23
  24 static inline bool sk_under_global_memory_pressure(const struct sock *sk)
  25 {
  26         return proto_memory_pressure(sk->sk_prot);
  27 }
  28
  29 static 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_sockets_enabled && sk->sk_memcg &&
  35             mem_cgroup_under_socket_pressure(sk->sk_memcg))
  36                 return true;
  37
  38         return !!READ_ONCE(*sk->sk_prot->memory_pressure);
  39 }
  40
  41 static inline long
  42 proto_memory_allocated(const struct proto *prot)
  43 {
  44         return max(0L, atomic_long_read(prot->memory_allocated));
  45 }
  46
  47 static inline long
  48 sk_memory_allocated(const struct sock *sk)
  49 {
  50         return proto_memory_allocated(sk->sk_prot);
  51 }
  52
  53 static inline void proto_memory_pcpu_drain(struct proto *proto)
  54 {
  55         int val = this_cpu_xchg(*proto->per_cpu_fw_alloc, 0);
  56
  57         if (val)
  58                 atomic_long_add(val, proto->memory_allocated);
  59 }
  60
  61 static inline void
  62 sk_memory_allocated_add(const struct sock *sk, int val)
  63 {
  64         struct proto *proto = sk->sk_prot;
  65
  66         val = this_cpu_add_return(*proto->per_cpu_fw_alloc, val);
  67
  68         if (unlikely(val >= READ_ONCE(net_hotdata.sysctl_mem_pcpu_rsv)))
  69                 proto_memory_pcpu_drain(proto);
  70 }
  71
  72 static inline void
  73 sk_memory_allocated_sub(const struct sock *sk, int val)
  74 {
  75         struct proto *proto = sk->sk_prot;
  76
  77         val = this_cpu_sub_return(*proto->per_cpu_fw_alloc, val);
  78
  79         if (unlikely(val <= -READ_ONCE(net_hotdata.sysctl_mem_pcpu_rsv)))
  80                 proto_memory_pcpu_drain(proto);
  81 }
  82
  83 #endif /* _PROTO_MEMORY_H */