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 */ 84