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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2c1409a0a2
While investigating for network latencies, I found inet_getid() was a contention point for some workloads, as inet_peer_idlock is shared by all inet_getid() users regardless of peers. One way to fix this is to make ip_id_count an atomic_t instead of __u16, and use atomic_add_return(). In order to keep sizeof(struct inet_peer) = 64 on 64bit arches tcp_ts_stamp is also converted to __u32 instead of "unsigned long". Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/*
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* INETPEER - A storage for permanent information about peers
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*
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* Authors: Andrey V. Savochkin <saw@msu.ru>
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*/
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#ifndef _NET_INETPEER_H
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#define _NET_INETPEER_H
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/spinlock.h>
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#include <asm/atomic.h>
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struct inet_peer {
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/* group together avl_left,avl_right,v4daddr to speedup lookups */
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struct inet_peer *avl_left, *avl_right;
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__be32 v4daddr; /* peer's address */
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__u32 avl_height;
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struct list_head unused;
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__u32 dtime; /* the time of last use of not
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* referenced entries */
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atomic_t refcnt;
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atomic_t rid; /* Frag reception counter */
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atomic_t ip_id_count; /* IP ID for the next packet */
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__u32 tcp_ts;
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__u32 tcp_ts_stamp;
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};
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void inet_initpeers(void) __init;
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/* can be called with or without local BH being disabled */
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struct inet_peer *inet_getpeer(__be32 daddr, int create);
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/* can be called from BH context or outside */
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extern void inet_putpeer(struct inet_peer *p);
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/* can be called with or without local BH being disabled */
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static inline __u16 inet_getid(struct inet_peer *p, int more)
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{
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more++;
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return atomic_add_return(more, &p->ip_id_count) - more;
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}
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#endif /* _NET_INETPEER_H */
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