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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * benchmark.c:
4 * Author: Konstantin Khlebnikov <[email protected]>
5 */
6#include <linux/radix-tree.h>
7#include <linux/slab.h>
8#include <linux/errno.h>
9#include <time.h>
10#include "test.h"
11
12#define NSEC_PER_SEC 1000000000L
13
14static long long benchmark_iter(struct radix_tree_root *root, bool tagged)
15{
16 volatile unsigned long sink = 0;
17 struct radix_tree_iter iter;
18 struct timespec start, finish;
19 long long nsec;
20 int l, loops = 1;
21 void **slot;
22
23#ifdef BENCHMARK
24again:
25#endif
26 clock_gettime(CLOCK_MONOTONIC, &start);
27 for (l = 0; l < loops; l++) {
28 if (tagged) {
29 radix_tree_for_each_tagged(slot, root, &iter, 0, 0)
30 sink ^= (unsigned long)slot;
31 } else {
32 radix_tree_for_each_slot(slot, root, &iter, 0)
33 sink ^= (unsigned long)slot;
34 }
35 }
36 clock_gettime(CLOCK_MONOTONIC, &finish);
37
38 nsec = (finish.tv_sec - start.tv_sec) * NSEC_PER_SEC +
39 (finish.tv_nsec - start.tv_nsec);
40
41#ifdef BENCHMARK
42 if (loops == 1 && nsec * 5 < NSEC_PER_SEC) {
43 loops = NSEC_PER_SEC / nsec / 4 + 1;
44 goto again;
45 }
46#endif
47
48 nsec /= loops;
49 return nsec;
50}
51
52static void benchmark_insert(struct radix_tree_root *root,
53 unsigned long size, unsigned long step)
54{
55 struct timespec start, finish;
56 unsigned long index;
57 long long nsec;
58
59 clock_gettime(CLOCK_MONOTONIC, &start);
60
61 for (index = 0 ; index < size ; index += step)
62 item_insert(root, index);
63
64 clock_gettime(CLOCK_MONOTONIC, &finish);
65
66 nsec = (finish.tv_sec - start.tv_sec) * NSEC_PER_SEC +
67 (finish.tv_nsec - start.tv_nsec);
68
69 printv(2, "Size: %8ld, step: %8ld, insertion: %15lld ns\n",
70 size, step, nsec);
71}
72
73static void benchmark_tagging(struct radix_tree_root *root,
74 unsigned long size, unsigned long step)
75{
76 struct timespec start, finish;
77 unsigned long index;
78 long long nsec;
79
80 clock_gettime(CLOCK_MONOTONIC, &start);
81
82 for (index = 0 ; index < size ; index += step)
83 radix_tree_tag_set(root, index, 0);
84
85 clock_gettime(CLOCK_MONOTONIC, &finish);
86
87 nsec = (finish.tv_sec - start.tv_sec) * NSEC_PER_SEC +
88 (finish.tv_nsec - start.tv_nsec);
89
90 printv(2, "Size: %8ld, step: %8ld, tagging: %17lld ns\n",
91 size, step, nsec);
92}
93
94static void benchmark_delete(struct radix_tree_root *root,
95 unsigned long size, unsigned long step)
96{
97 struct timespec start, finish;
98 unsigned long index;
99 long long nsec;
100
101 clock_gettime(CLOCK_MONOTONIC, &start);
102
103 for (index = 0 ; index < size ; index += step)
104 item_delete(root, index);
105
106 clock_gettime(CLOCK_MONOTONIC, &finish);
107
108 nsec = (finish.tv_sec - start.tv_sec) * NSEC_PER_SEC +
109 (finish.tv_nsec - start.tv_nsec);
110
111 printv(2, "Size: %8ld, step: %8ld, deletion: %16lld ns\n",
112 size, step, nsec);
113}
114
115static void benchmark_size(unsigned long size, unsigned long step)
116{
117 RADIX_TREE(tree, GFP_KERNEL);
118 long long normal, tagged;
119
120 benchmark_insert(&tree, size, step);
121 benchmark_tagging(&tree, size, step);
122
123 tagged = benchmark_iter(&tree, true);
124 normal = benchmark_iter(&tree, false);
125
126 printv(2, "Size: %8ld, step: %8ld, tagged iteration: %8lld ns\n",
127 size, step, tagged);
128 printv(2, "Size: %8ld, step: %8ld, normal iteration: %8lld ns\n",
129 size, step, normal);
130
131 benchmark_delete(&tree, size, step);
132
133 item_kill_tree(&tree);
134 rcu_barrier();
135}
136
137void benchmark(void)
138{
139 unsigned long size[] = {1 << 10, 1 << 20, 0};
140 unsigned long step[] = {1, 2, 7, 15, 63, 64, 65,
141 128, 256, 512, 12345, 0};
142 int c, s;
143
144 printv(1, "starting benchmarks\n");
145 printv(1, "RADIX_TREE_MAP_SHIFT = %d\n", RADIX_TREE_MAP_SHIFT);
146
147 for (c = 0; size[c]; c++)
148 for (s = 0; step[s]; s++)
149 benchmark_size(size[c], step[s]);
150}