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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _PROTO_MEMORY_H
#define _PROTO_MEMORY_H
#include <net/sock.h>
#include <net/hotdata.h>
/* 1 MB per cpu, in page units */
#define SK_MEMORY_PCPU_RESERVE (1 << (20 - PAGE_SHIFT))
static inline bool sk_has_memory_pressure(const struct sock *sk)
{
return sk->sk_prot->memory_pressure != NULL;
}
static inline bool
proto_memory_pressure(const struct proto *prot)
{
if (!prot->memory_pressure)
return false;
return !!READ_ONCE(*prot->memory_pressure);
}
static inline bool sk_under_global_memory_pressure(const struct sock *sk)
{
return proto_memory_pressure(sk->sk_prot);
}
static inline bool sk_under_memory_pressure(const struct sock *sk)
{
if (!sk->sk_prot->memory_pressure)
return false;
if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
mem_cgroup_under_socket_pressure(sk->sk_memcg))
return true;
return !!READ_ONCE(*sk->sk_prot->memory_pressure);
}
static inline long
proto_memory_allocated(const struct proto *prot)
{
return max(0L, atomic_long_read(prot->memory_allocated));
}
static inline long
sk_memory_allocated(const struct sock *sk)
{
return proto_memory_allocated(sk->sk_prot);
}
static inline void proto_memory_pcpu_drain(struct proto *proto)
{
int val = this_cpu_xchg(*proto->per_cpu_fw_alloc, 0);
if (val)
atomic_long_add(val, proto->memory_allocated);
}
static inline void
sk_memory_allocated_add(const struct sock *sk, int val)
{
struct proto *proto = sk->sk_prot;
val = this_cpu_add_return(*proto->per_cpu_fw_alloc, val);
if (unlikely(val >= READ_ONCE(net_hotdata.sysctl_mem_pcpu_rsv)))
proto_memory_pcpu_drain(proto);
}
static inline void
sk_memory_allocated_sub(const struct sock *sk, int val)
{
struct proto *proto = sk->sk_prot;
val = this_cpu_sub_return(*proto->per_cpu_fw_alloc, val);
if (unlikely(val <= -READ_ONCE(net_hotdata.sysctl_mem_pcpu_rsv)))
proto_memory_pcpu_drain(proto);
}
#endif /* _PROTO_MEMORY_H */
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