Commit | Line | Data |
---|---|---|
481eaec3 MT |
1 | /* |
2 | * Copyright (C) 2016 Red Hat, Inc. | |
3 | * Author: Michael S. Tsirkin <mst@redhat.com> | |
4 | * This work is licensed under the terms of the GNU GPL, version 2. | |
5 | * | |
6 | * Command line processing and common functions for ring benchmarking. | |
7 | */ | |
8 | #define _GNU_SOURCE | |
9 | #include <getopt.h> | |
10 | #include <pthread.h> | |
11 | #include <assert.h> | |
12 | #include <sched.h> | |
13 | #include "main.h" | |
14 | #include <sys/eventfd.h> | |
15 | #include <stdlib.h> | |
16 | #include <stdio.h> | |
17 | #include <unistd.h> | |
18 | #include <limits.h> | |
19 | ||
20 | int runcycles = 10000000; | |
21 | int max_outstanding = INT_MAX; | |
22 | int batch = 1; | |
23 | ||
24 | bool do_sleep = false; | |
25 | bool do_relax = false; | |
26 | bool do_exit = true; | |
27 | ||
28 | unsigned ring_size = 256; | |
29 | ||
30 | static int kickfd = -1; | |
31 | static int callfd = -1; | |
32 | ||
33 | void notify(int fd) | |
34 | { | |
35 | unsigned long long v = 1; | |
36 | int r; | |
37 | ||
38 | vmexit(); | |
39 | r = write(fd, &v, sizeof v); | |
40 | assert(r == sizeof v); | |
41 | vmentry(); | |
42 | } | |
43 | ||
44 | void wait_for_notify(int fd) | |
45 | { | |
46 | unsigned long long v = 1; | |
47 | int r; | |
48 | ||
49 | vmexit(); | |
50 | r = read(fd, &v, sizeof v); | |
51 | assert(r == sizeof v); | |
52 | vmentry(); | |
53 | } | |
54 | ||
55 | void kick(void) | |
56 | { | |
57 | notify(kickfd); | |
58 | } | |
59 | ||
60 | void wait_for_kick(void) | |
61 | { | |
62 | wait_for_notify(kickfd); | |
63 | } | |
64 | ||
65 | void call(void) | |
66 | { | |
67 | notify(callfd); | |
68 | } | |
69 | ||
70 | void wait_for_call(void) | |
71 | { | |
72 | wait_for_notify(callfd); | |
73 | } | |
74 | ||
75 | void set_affinity(const char *arg) | |
76 | { | |
77 | cpu_set_t cpuset; | |
78 | int ret; | |
79 | pthread_t self; | |
80 | long int cpu; | |
81 | char *endptr; | |
82 | ||
83 | if (!arg) | |
84 | return; | |
85 | ||
86 | cpu = strtol(arg, &endptr, 0); | |
87 | assert(!*endptr); | |
88 | ||
89 | assert(cpu >= 0 || cpu < CPU_SETSIZE); | |
90 | ||
91 | self = pthread_self(); | |
92 | CPU_ZERO(&cpuset); | |
93 | CPU_SET(cpu, &cpuset); | |
94 | ||
95 | ret = pthread_setaffinity_np(self, sizeof(cpu_set_t), &cpuset); | |
96 | assert(!ret); | |
97 | } | |
98 | ||
99 | static void run_guest(void) | |
100 | { | |
101 | int completed_before; | |
102 | int completed = 0; | |
103 | int started = 0; | |
104 | int bufs = runcycles; | |
105 | int spurious = 0; | |
106 | int r; | |
107 | unsigned len; | |
108 | void *buf; | |
109 | int tokick = batch; | |
110 | ||
111 | for (;;) { | |
112 | if (do_sleep) | |
113 | disable_call(); | |
114 | completed_before = completed; | |
115 | do { | |
116 | if (started < bufs && | |
117 | started - completed < max_outstanding) { | |
118 | r = add_inbuf(0, NULL, "Hello, world!"); | |
119 | if (__builtin_expect(r == 0, true)) { | |
120 | ++started; | |
121 | if (!--tokick) { | |
122 | tokick = batch; | |
123 | if (do_sleep) | |
124 | kick_available(); | |
125 | } | |
126 | ||
127 | } | |
128 | } else | |
129 | r = -1; | |
130 | ||
131 | /* Flush out completed bufs if any */ | |
132 | if (get_buf(&len, &buf)) { | |
133 | ++completed; | |
134 | if (__builtin_expect(completed == bufs, false)) | |
135 | return; | |
136 | r = 0; | |
137 | } | |
138 | } while (r == 0); | |
139 | if (completed == completed_before) | |
140 | ++spurious; | |
141 | assert(completed <= bufs); | |
142 | assert(started <= bufs); | |
143 | if (do_sleep) { | |
144 | if (enable_call()) | |
145 | wait_for_call(); | |
146 | } else { | |
147 | poll_used(); | |
148 | } | |
149 | } | |
150 | } | |
151 | ||
152 | static void run_host(void) | |
153 | { | |
154 | int completed_before; | |
155 | int completed = 0; | |
156 | int spurious = 0; | |
157 | int bufs = runcycles; | |
158 | unsigned len; | |
159 | void *buf; | |
160 | ||
161 | for (;;) { | |
162 | if (do_sleep) { | |
163 | if (enable_kick()) | |
164 | wait_for_kick(); | |
165 | } else { | |
166 | poll_avail(); | |
167 | } | |
168 | if (do_sleep) | |
169 | disable_kick(); | |
170 | completed_before = completed; | |
171 | while (__builtin_expect(use_buf(&len, &buf), true)) { | |
172 | if (do_sleep) | |
173 | call_used(); | |
174 | ++completed; | |
175 | if (__builtin_expect(completed == bufs, false)) | |
176 | return; | |
177 | } | |
178 | if (completed == completed_before) | |
179 | ++spurious; | |
180 | assert(completed <= bufs); | |
181 | if (completed == bufs) | |
182 | break; | |
183 | } | |
184 | } | |
185 | ||
186 | void *start_guest(void *arg) | |
187 | { | |
188 | set_affinity(arg); | |
189 | run_guest(); | |
190 | pthread_exit(NULL); | |
191 | } | |
192 | ||
193 | void *start_host(void *arg) | |
194 | { | |
195 | set_affinity(arg); | |
196 | run_host(); | |
197 | pthread_exit(NULL); | |
198 | } | |
199 | ||
200 | static const char optstring[] = ""; | |
201 | static const struct option longopts[] = { | |
202 | { | |
203 | .name = "help", | |
204 | .has_arg = no_argument, | |
205 | .val = 'h', | |
206 | }, | |
207 | { | |
208 | .name = "host-affinity", | |
209 | .has_arg = required_argument, | |
210 | .val = 'H', | |
211 | }, | |
212 | { | |
213 | .name = "guest-affinity", | |
214 | .has_arg = required_argument, | |
215 | .val = 'G', | |
216 | }, | |
217 | { | |
218 | .name = "ring-size", | |
219 | .has_arg = required_argument, | |
220 | .val = 'R', | |
221 | }, | |
222 | { | |
223 | .name = "run-cycles", | |
224 | .has_arg = required_argument, | |
225 | .val = 'C', | |
226 | }, | |
227 | { | |
228 | .name = "outstanding", | |
229 | .has_arg = required_argument, | |
230 | .val = 'o', | |
231 | }, | |
232 | { | |
233 | .name = "batch", | |
234 | .has_arg = required_argument, | |
235 | .val = 'b', | |
236 | }, | |
237 | { | |
238 | .name = "sleep", | |
239 | .has_arg = no_argument, | |
240 | .val = 's', | |
241 | }, | |
242 | { | |
243 | .name = "relax", | |
244 | .has_arg = no_argument, | |
245 | .val = 'x', | |
246 | }, | |
247 | { | |
248 | .name = "exit", | |
249 | .has_arg = no_argument, | |
250 | .val = 'e', | |
251 | }, | |
252 | { | |
253 | } | |
254 | }; | |
255 | ||
256 | static void help(void) | |
257 | { | |
258 | fprintf(stderr, "Usage: <test> [--help]" | |
259 | " [--host-affinity H]" | |
260 | " [--guest-affinity G]" | |
261 | " [--ring-size R (default: %d)]" | |
262 | " [--run-cycles C (default: %d)]" | |
263 | " [--batch b]" | |
264 | " [--outstanding o]" | |
265 | " [--sleep]" | |
266 | " [--relax]" | |
267 | " [--exit]" | |
268 | "\n", | |
269 | ring_size, | |
270 | runcycles); | |
271 | } | |
272 | ||
273 | int main(int argc, char **argv) | |
274 | { | |
275 | int ret; | |
276 | pthread_t host, guest; | |
277 | void *tret; | |
278 | char *host_arg = NULL; | |
279 | char *guest_arg = NULL; | |
280 | char *endptr; | |
281 | long int c; | |
282 | ||
283 | kickfd = eventfd(0, 0); | |
284 | assert(kickfd >= 0); | |
285 | callfd = eventfd(0, 0); | |
286 | assert(callfd >= 0); | |
287 | ||
288 | for (;;) { | |
289 | int o = getopt_long(argc, argv, optstring, longopts, NULL); | |
290 | switch (o) { | |
291 | case -1: | |
292 | goto done; | |
293 | case '?': | |
294 | help(); | |
295 | exit(2); | |
296 | case 'H': | |
297 | host_arg = optarg; | |
298 | break; | |
299 | case 'G': | |
300 | guest_arg = optarg; | |
301 | break; | |
302 | case 'R': | |
303 | ring_size = strtol(optarg, &endptr, 0); | |
304 | assert(ring_size && !(ring_size & (ring_size - 1))); | |
305 | assert(!*endptr); | |
306 | break; | |
307 | case 'C': | |
308 | c = strtol(optarg, &endptr, 0); | |
309 | assert(!*endptr); | |
310 | assert(c > 0 && c < INT_MAX); | |
311 | runcycles = c; | |
312 | break; | |
313 | case 'o': | |
314 | c = strtol(optarg, &endptr, 0); | |
315 | assert(!*endptr); | |
316 | assert(c > 0 && c < INT_MAX); | |
317 | max_outstanding = c; | |
318 | break; | |
319 | case 'b': | |
320 | c = strtol(optarg, &endptr, 0); | |
321 | assert(!*endptr); | |
322 | assert(c > 0 && c < INT_MAX); | |
323 | batch = c; | |
324 | break; | |
325 | case 's': | |
326 | do_sleep = true; | |
327 | break; | |
328 | case 'x': | |
329 | do_relax = true; | |
330 | break; | |
331 | case 'e': | |
332 | do_exit = true; | |
333 | break; | |
334 | default: | |
335 | help(); | |
336 | exit(4); | |
337 | break; | |
338 | } | |
339 | } | |
340 | ||
341 | /* does nothing here, used to make sure all smp APIs compile */ | |
342 | smp_acquire(); | |
343 | smp_release(); | |
344 | smp_mb(); | |
345 | done: | |
346 | ||
347 | if (batch > max_outstanding) | |
348 | batch = max_outstanding; | |
349 | ||
350 | if (optind < argc) { | |
351 | help(); | |
352 | exit(4); | |
353 | } | |
354 | alloc_ring(); | |
355 | ||
356 | ret = pthread_create(&host, NULL, start_host, host_arg); | |
357 | assert(!ret); | |
358 | ret = pthread_create(&guest, NULL, start_guest, guest_arg); | |
359 | assert(!ret); | |
360 | ||
361 | ret = pthread_join(guest, &tret); | |
362 | assert(!ret); | |
363 | ret = pthread_join(host, &tret); | |
364 | assert(!ret); | |
365 | return 0; | |
366 | } |