1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/*
* benchmark.c:
* Author: Konstantin Khlebnikov <koct9i@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <linux/radix-tree.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <time.h>
#include "test.h"
#define NSEC_PER_SEC 1000000000L
static long long benchmark_iter(struct radix_tree_root *root, bool tagged)
{
volatile unsigned long sink = 0;
struct radix_tree_iter iter;
struct timespec start, finish;
long long nsec;
int l, loops = 1;
void **slot;
#ifdef BENCHMARK
again:
#endif
clock_gettime(CLOCK_MONOTONIC, &start);
for (l = 0; l < loops; l++) {
if (tagged) {
radix_tree_for_each_tagged(slot, root, &iter, 0, 0)
sink ^= (unsigned long)slot;
} else {
radix_tree_for_each_slot(slot, root, &iter, 0)
sink ^= (unsigned long)slot;
}
}
clock_gettime(CLOCK_MONOTONIC, &finish);
nsec = (finish.tv_sec - start.tv_sec) * NSEC_PER_SEC +
(finish.tv_nsec - start.tv_nsec);
#ifdef BENCHMARK
if (loops == 1 && nsec * 5 < NSEC_PER_SEC) {
loops = NSEC_PER_SEC / nsec / 4 + 1;
goto again;
}
#endif
nsec /= loops;
return nsec;
}
static void benchmark_insert(struct radix_tree_root *root,
unsigned long size, unsigned long step)
{
struct timespec start, finish;
unsigned long index;
long long nsec;
clock_gettime(CLOCK_MONOTONIC, &start);
for (index = 0 ; index < size ; index += step)
item_insert(root, index);
clock_gettime(CLOCK_MONOTONIC, &finish);
nsec = (finish.tv_sec - start.tv_sec) * NSEC_PER_SEC +
(finish.tv_nsec - start.tv_nsec);
printv(2, "Size: %8ld, step: %8ld, insertion: %15lld ns\n",
size, step, nsec);
}
static void benchmark_tagging(struct radix_tree_root *root,
unsigned long size, unsigned long step)
{
struct timespec start, finish;
unsigned long index;
long long nsec;
clock_gettime(CLOCK_MONOTONIC, &start);
for (index = 0 ; index < size ; index += step)
radix_tree_tag_set(root, index, 0);
clock_gettime(CLOCK_MONOTONIC, &finish);
nsec = (finish.tv_sec - start.tv_sec) * NSEC_PER_SEC +
(finish.tv_nsec - start.tv_nsec);
printv(2, "Size: %8ld, step: %8ld, tagging: %17lld ns\n",
size, step, nsec);
}
static void benchmark_delete(struct radix_tree_root *root,
unsigned long size, unsigned long step)
{
struct timespec start, finish;
unsigned long index;
long long nsec;
clock_gettime(CLOCK_MONOTONIC, &start);
for (index = 0 ; index < size ; index += step)
item_delete(root, index);
clock_gettime(CLOCK_MONOTONIC, &finish);
nsec = (finish.tv_sec - start.tv_sec) * NSEC_PER_SEC +
(finish.tv_nsec - start.tv_nsec);
printv(2, "Size: %8ld, step: %8ld, deletion: %16lld ns\n",
size, step, nsec);
}
static void benchmark_size(unsigned long size, unsigned long step)
{
RADIX_TREE(tree, GFP_KERNEL);
long long normal, tagged;
benchmark_insert(&tree, size, step);
benchmark_tagging(&tree, size, step);
tagged = benchmark_iter(&tree, true);
normal = benchmark_iter(&tree, false);
printv(2, "Size: %8ld, step: %8ld, tagged iteration: %8lld ns\n",
size, step, tagged);
printv(2, "Size: %8ld, step: %8ld, normal iteration: %8lld ns\n",
size, step, normal);
benchmark_delete(&tree, size, step);
item_kill_tree(&tree);
rcu_barrier();
}
void benchmark(void)
{
unsigned long size[] = {1 << 10, 1 << 20, 0};
unsigned long step[] = {1, 2, 7, 15, 63, 64, 65,
128, 256, 512, 12345, 0};
int c, s;
printv(1, "starting benchmarks\n");
printv(1, "RADIX_TREE_MAP_SHIFT = %d\n", RADIX_TREE_MAP_SHIFT);
for (c = 0; size[c]; c++)
for (s = 0; step[s]; s++)
benchmark_size(size[c], step[s]);
}
|
