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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/*
* Copyright (c) 2010, 2011 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "stress.h"
#include <stdlib.h>
#include <string.h>
#include "unixctl.h"
#include "dynamic-string.h"
#include "random.h"
#include "util.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(stress);
/* The stress options. */
#if USE_LINKER_SECTIONS
extern struct stress_option *__start_stress_options[];
extern struct stress_option *__stop_stress_options[];
#define stress_options __start_stress_options
#define n_stress_options (__stop_stress_options - __start_stress_options)
#else /* !USE_LINKER_SECTIONS */
#undef STRESS_OPTION
#define STRESS_OPTION(NAME, DESCRIPTION, RECOMMENDED, MIN, MAX, DEFAULT) \
STRESS_OPTION__(NAME, DESCRIPTION, RECOMMENDED, MIN, MAX, DEFAULT);
#include "stress.def"
#undef STRESS_OPTION
struct stress_option *stress_options[] = {
#define STRESS_OPTION(NAME, DESCRIPTION, RECOMMENDED, MIN, MAX, DEFAULT) \
&stress_##NAME,
#include "stress.def"
#undef STRESS_OPTION
};
#define n_stress_options ARRAY_SIZE(stress_options)
#endif /* !USE_LINKER_SECTIONS */
/* Enable stress options? */
static bool stress_enabled;
static void
stress_reset(struct stress_option *option)
{
if (!option->period || !stress_enabled) {
option->counter = UINT_MAX;
} else if (!option->random) {
option->counter = option->period;
} else if (option->period < UINT32_MAX / 2) {
/* Random distribution with mean of option->period. */
option->counter = random_uint32() % ((2 * option->period) - 1) + 1;
} else {
option->counter = random_uint32();
}
}
static void
stress_enable(bool enable)
{
if (stress_enabled != enable) {
int i;
stress_enabled = enable;
for (i = 0; i < n_stress_options; i++) {
stress_reset(stress_options[i]);
}
}
}
bool
stress_sample_slowpath__(struct stress_option *option)
{
stress_reset(option);
if (option->period && stress_enabled) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 1);
option->hits++;
VLOG_DBG_RL(&rl, "%s hit (%llu total)", option->name, option->hits);
return true;
} else {
return false;
}
}
static void
stress_set(struct stress_option *option, unsigned int period, bool random)
{
if (period > option->max) {
period = option->max;
}
if (period < option->min) {
period = option->min;
}
if (period != option->period || random != option->random) {
option->random = random;
option->period = period;
stress_reset(option);
}
}
static void
stress_unixctl_list(struct unixctl_conn *conn, int argc OVS_UNUSED,
const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
{
int i, found = 0;
struct ds results;
ds_init(&results);
ds_put_cstr(&results, "NAME (DESCRIPTION)\n");
ds_put_format(&results, "%11s %10s %10s %10s\n",
"PERIOD", "MODE", "COUNTER", "HITS");
ds_put_format(&results, "%11s %10s %10s %10s\n",
"RECOMMENDED", "MINIMUM", "MAXIMUM", "DEFAULT");
for (i = 0; i < n_stress_options; i++) {
struct stress_option *option = stress_options[i];
if (!argv[1] || strstr(option->name, argv[1])) {
ds_put_format(&results, "\n%s (%s)\n",
option->name, option->description);
if (option->period) {
ds_put_format(&results, "%11u %10s ", option->period,
option->random ? "random" : "periodic");
if (stress_enabled) {
ds_put_format(&results, "%10u", option->counter);
} else {
ds_put_cstr(&results, " n/a");
}
} else {
ds_put_format(&results, "%11s %10s %10s",
"disabled", "n/a", "n/a");
}
ds_put_format(&results, " %10llu\n", option->hits);
ds_put_format(&results, "%11u %10u %10u ",
option->recommended, option->min, option->max);
if (!option->def) {
ds_put_format(&results, "%10s", "disabled");
} else {
ds_put_format(&results, "%10u", option->def);
}
ds_put_char(&results, '\n');
found++;
}
}
if (found) {
unixctl_command_reply(conn, ds_cstr(&results));
} else {
unixctl_command_reply_error(conn, NULL);
}
ds_destroy(&results);
}
static void
stress_unixctl_enable(struct unixctl_conn *conn, int argc OVS_UNUSED,
const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
{
stress_enable(true);
unixctl_command_reply(conn, NULL);
}
static void
stress_unixctl_disable(struct unixctl_conn *conn, int argc OVS_UNUSED,
const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
{
stress_enable(false);
unixctl_command_reply(conn, NULL);
}
static void
stress_unixctl_set(struct unixctl_conn *conn, int argc OVS_UNUSED,
const char *argv[], void *aux OVS_UNUSED)
{
const char *option_name = argv[1];
const char *option_val = argv[2];
int i;
for (i = 0; i < n_stress_options; i++) {
struct stress_option *option = stress_options[i];
if (!strcmp(option_name, option->name)) {
unsigned int period = strtoul(option_val, NULL, 0);
bool random = !strcmp(argv[3], "random");
stress_set(option, period, random);
unixctl_command_reply(conn, NULL);
return;
}
}
unixctl_command_reply_error(conn, NULL);
}
/* Exposes ovs-appctl access to the stress options.
*
* This function is not required to simply reference stress options and have
* them fire at their default periods.
*/
void
stress_init_command(void)
{
unixctl_command_register("stress/list", "", 0, 1,
stress_unixctl_list, NULL);
unixctl_command_register("stress/set", "option period [random | periodic]",
2, 3, stress_unixctl_set, NULL);
unixctl_command_register("stress/enable", "", 0, 0,
stress_unixctl_enable, NULL);
unixctl_command_register("stress/disable", "", 0, 0,
stress_unixctl_disable, NULL);
}
|
