mirror of
https://github.com/torvalds/linux.git
synced 2024-11-30 16:11:38 +00:00
bb9b9f8802
This patch writes 'node->ref = 1' only if node->ref is 0.
The number of lookups/s for a ~1M entries LRU map increased by
~30% (260097 to 343313).
Other writes on 'node->ref = 0' is not changed. In those cases, the
same cache line has to be changed anyway.
First column: Size of the LRU hash
Second column: Number of lookups/s
Before:
> echo "$((2**20+1)): $(./map_perf_test 1024 1 $((2**20+1)) 10000000 | awk '{print $3}')"
1048577: 260097
After:
> echo "$((2**20+1)): $(./map_perf_test 1024 1 $((2**20+1)) 10000000 | awk '{print $3}')"
1048577: 343313
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/* Copyright (c) 2016 Facebook
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*/
|
|
#ifndef __BPF_LRU_LIST_H_
|
|
#define __BPF_LRU_LIST_H_
|
|
|
|
#include <linux/list.h>
|
|
#include <linux/spinlock_types.h>
|
|
|
|
#define NR_BPF_LRU_LIST_T (3)
|
|
#define NR_BPF_LRU_LIST_COUNT (2)
|
|
#define NR_BPF_LRU_LOCAL_LIST_T (2)
|
|
#define BPF_LOCAL_LIST_T_OFFSET NR_BPF_LRU_LIST_T
|
|
|
|
enum bpf_lru_list_type {
|
|
BPF_LRU_LIST_T_ACTIVE,
|
|
BPF_LRU_LIST_T_INACTIVE,
|
|
BPF_LRU_LIST_T_FREE,
|
|
BPF_LRU_LOCAL_LIST_T_FREE,
|
|
BPF_LRU_LOCAL_LIST_T_PENDING,
|
|
};
|
|
|
|
struct bpf_lru_node {
|
|
struct list_head list;
|
|
u16 cpu;
|
|
u8 type;
|
|
u8 ref;
|
|
};
|
|
|
|
struct bpf_lru_list {
|
|
struct list_head lists[NR_BPF_LRU_LIST_T];
|
|
unsigned int counts[NR_BPF_LRU_LIST_COUNT];
|
|
/* The next inacitve list rotation starts from here */
|
|
struct list_head *next_inactive_rotation;
|
|
|
|
raw_spinlock_t lock ____cacheline_aligned_in_smp;
|
|
};
|
|
|
|
struct bpf_lru_locallist {
|
|
struct list_head lists[NR_BPF_LRU_LOCAL_LIST_T];
|
|
u16 next_steal;
|
|
raw_spinlock_t lock;
|
|
};
|
|
|
|
struct bpf_common_lru {
|
|
struct bpf_lru_list lru_list;
|
|
struct bpf_lru_locallist __percpu *local_list;
|
|
};
|
|
|
|
typedef bool (*del_from_htab_func)(void *arg, struct bpf_lru_node *node);
|
|
|
|
struct bpf_lru {
|
|
union {
|
|
struct bpf_common_lru common_lru;
|
|
struct bpf_lru_list __percpu *percpu_lru;
|
|
};
|
|
del_from_htab_func del_from_htab;
|
|
void *del_arg;
|
|
unsigned int hash_offset;
|
|
unsigned int nr_scans;
|
|
bool percpu;
|
|
};
|
|
|
|
static inline void bpf_lru_node_set_ref(struct bpf_lru_node *node)
|
|
{
|
|
/* ref is an approximation on access frequency. It does not
|
|
* have to be very accurate. Hence, no protection is used.
|
|
*/
|
|
if (!node->ref)
|
|
node->ref = 1;
|
|
}
|
|
|
|
int bpf_lru_init(struct bpf_lru *lru, bool percpu, u32 hash_offset,
|
|
del_from_htab_func del_from_htab, void *delete_arg);
|
|
void bpf_lru_populate(struct bpf_lru *lru, void *buf, u32 node_offset,
|
|
u32 elem_size, u32 nr_elems);
|
|
void bpf_lru_destroy(struct bpf_lru *lru);
|
|
struct bpf_lru_node *bpf_lru_pop_free(struct bpf_lru *lru, u32 hash);
|
|
void bpf_lru_push_free(struct bpf_lru *lru, struct bpf_lru_node *node);
|
|
void bpf_lru_promote(struct bpf_lru *lru, struct bpf_lru_node *node);
|
|
|
|
#endif
|