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db66e574 JD |
1 | /* |
2 | * Copyright (C) 2017 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _LGPL_SOURCE | |
19 | #include <lttng/trigger/trigger.h> | |
20 | #include <common/error.h> | |
21 | #include <common/config/session-config.h> | |
22 | #include <common/defaults.h> | |
23 | #include <common/utils.h> | |
24 | #include <common/futex.h> | |
25 | #include <common/align.h> | |
26 | #include <common/time.h> | |
27 | #include <common/hashtable/utils.h> | |
28 | #include <sys/eventfd.h> | |
29 | #include <sys/stat.h> | |
30 | #include <time.h> | |
31 | #include <signal.h> | |
32 | #include <inttypes.h> | |
33 | ||
34 | #include <common/kernel-ctl/kernel-ctl.h> | |
35 | #include <lttng/notification/channel-internal.h> | |
36 | ||
37 | #include "rotation-thread.h" | |
38 | #include "lttng-sessiond.h" | |
39 | #include "health-sessiond.h" | |
40 | #include "rotate.h" | |
41 | #include "cmd.h" | |
42 | #include "session.h" | |
d086f507 | 43 | #include "sessiond-timer.h" |
db66e574 JD |
44 | |
45 | #include <urcu.h> | |
46 | #include <urcu/list.h> | |
47 | #include <urcu/rculfhash.h> | |
48 | ||
49 | /* | |
50 | * Store a struct rotation_channel_info for each channel that is currently | |
51 | * being rotated by the consumer. | |
52 | */ | |
53 | struct cds_lfht *channel_pending_rotate_ht; | |
54 | ||
55 | struct rotation_thread_state { | |
56 | struct lttng_poll_event events; | |
57 | }; | |
58 | ||
59 | static | |
60 | void channel_rotation_info_destroy(struct rotation_channel_info *channel_info) | |
61 | { | |
62 | assert(channel_info); | |
63 | free(channel_info); | |
64 | } | |
65 | ||
66 | static | |
67 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
68 | { | |
69 | struct rotation_channel_key *channel_key = (struct rotation_channel_key *) key; | |
70 | struct rotation_channel_info *channel_info; | |
71 | ||
72 | channel_info = caa_container_of(node, struct rotation_channel_info, | |
73 | rotate_channels_ht_node); | |
74 | ||
75 | return !!((channel_key->key == channel_info->channel_key.key) && | |
76 | (channel_key->domain == channel_info->channel_key.domain)); | |
77 | } | |
78 | ||
79 | static | |
80 | struct rotation_channel_info *lookup_channel_pending(uint64_t key, | |
81 | enum lttng_domain_type domain) | |
82 | { | |
83 | struct cds_lfht_iter iter; | |
84 | struct cds_lfht_node *node; | |
85 | struct rotation_channel_info *channel_info = NULL; | |
86 | struct rotation_channel_key channel_key = { .key = key, | |
87 | .domain = domain }; | |
88 | ||
89 | cds_lfht_lookup(channel_pending_rotate_ht, | |
90 | hash_channel_key(&channel_key), | |
91 | match_channel_info, | |
92 | &channel_key, &iter); | |
93 | node = cds_lfht_iter_get_node(&iter); | |
94 | if (!node) { | |
95 | goto end; | |
96 | } | |
97 | ||
98 | channel_info = caa_container_of(node, struct rotation_channel_info, | |
99 | rotate_channels_ht_node); | |
100 | cds_lfht_del(channel_pending_rotate_ht, node); | |
101 | end: | |
102 | return channel_info; | |
103 | } | |
104 | ||
105 | /* | |
106 | * Destroy the thread data previously created by the init function. | |
107 | */ | |
108 | void rotation_thread_handle_destroy( | |
109 | struct rotation_thread_handle *handle) | |
110 | { | |
111 | int ret; | |
112 | ||
113 | if (!handle) { | |
114 | goto end; | |
115 | } | |
116 | ||
117 | if (handle->ust32_consumer >= 0) { | |
118 | ret = close(handle->ust32_consumer); | |
119 | if (ret) { | |
120 | PERROR("close 32-bit consumer channel rotation pipe"); | |
121 | } | |
122 | } | |
123 | if (handle->ust64_consumer >= 0) { | |
124 | ret = close(handle->ust64_consumer); | |
125 | if (ret) { | |
126 | PERROR("close 64-bit consumer channel rotation pipe"); | |
127 | } | |
128 | } | |
129 | if (handle->kernel_consumer >= 0) { | |
130 | ret = close(handle->kernel_consumer); | |
131 | if (ret) { | |
132 | PERROR("close kernel consumer channel rotation pipe"); | |
133 | } | |
134 | } | |
135 | ||
136 | end: | |
137 | free(handle); | |
138 | } | |
139 | ||
140 | struct rotation_thread_handle *rotation_thread_handle_create( | |
141 | struct lttng_pipe *ust32_channel_rotate_pipe, | |
142 | struct lttng_pipe *ust64_channel_rotate_pipe, | |
143 | struct lttng_pipe *kernel_channel_rotate_pipe, | |
d086f507 JD |
144 | int thread_quit_pipe, |
145 | struct rotation_thread_timer_queue *rotation_timer_queue) | |
db66e574 JD |
146 | { |
147 | struct rotation_thread_handle *handle; | |
148 | ||
149 | handle = zmalloc(sizeof(*handle)); | |
150 | if (!handle) { | |
151 | goto end; | |
152 | } | |
153 | ||
154 | if (ust32_channel_rotate_pipe) { | |
155 | handle->ust32_consumer = | |
156 | lttng_pipe_release_readfd( | |
157 | ust32_channel_rotate_pipe); | |
158 | if (handle->ust32_consumer < 0) { | |
159 | goto error; | |
160 | } | |
161 | } else { | |
162 | handle->ust32_consumer = -1; | |
163 | } | |
164 | if (ust64_channel_rotate_pipe) { | |
165 | handle->ust64_consumer = | |
166 | lttng_pipe_release_readfd( | |
167 | ust64_channel_rotate_pipe); | |
168 | if (handle->ust64_consumer < 0) { | |
169 | goto error; | |
170 | } | |
171 | } else { | |
172 | handle->ust64_consumer = -1; | |
173 | } | |
174 | if (kernel_channel_rotate_pipe) { | |
175 | handle->kernel_consumer = | |
176 | lttng_pipe_release_readfd( | |
177 | kernel_channel_rotate_pipe); | |
178 | if (handle->kernel_consumer < 0) { | |
179 | goto error; | |
180 | } | |
181 | } else { | |
182 | handle->kernel_consumer = -1; | |
183 | } | |
184 | handle->thread_quit_pipe = thread_quit_pipe; | |
d086f507 | 185 | handle->rotation_timer_queue = rotation_timer_queue; |
db66e574 JD |
186 | |
187 | end: | |
188 | return handle; | |
189 | error: | |
190 | rotation_thread_handle_destroy(handle); | |
191 | return NULL; | |
192 | } | |
193 | ||
194 | static | |
195 | int init_poll_set(struct lttng_poll_event *poll_set, | |
196 | struct rotation_thread_handle *handle) | |
197 | { | |
198 | int ret; | |
199 | ||
200 | /* | |
d086f507 | 201 | * Create pollset with size 5: |
db66e574 | 202 | * - sessiond quit pipe |
d086f507 | 203 | * - sessiond timer pipe, |
db66e574 JD |
204 | * - consumerd (32-bit user space) channel rotate pipe, |
205 | * - consumerd (64-bit user space) channel rotate pipe, | |
206 | * - consumerd (kernel) channel rotate pipe, | |
207 | */ | |
d086f507 | 208 | ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC); |
db66e574 JD |
209 | if (ret < 0) { |
210 | goto end; | |
211 | } | |
212 | ||
213 | ret = lttng_poll_add(poll_set, handle->thread_quit_pipe, | |
214 | LPOLLIN | LPOLLERR); | |
215 | if (ret < 0) { | |
216 | ERR("[rotation-thread] Failed to add thread_quit_pipe fd to pollset"); | |
217 | goto error; | |
218 | } | |
d086f507 JD |
219 | ret = lttng_poll_add(poll_set, |
220 | lttng_pipe_get_readfd(handle->rotation_timer_queue->event_pipe), | |
221 | LPOLLIN | LPOLLERR); | |
222 | if (ret < 0) { | |
223 | ERR("[rotation-thread] Failed to add rotate_pending fd to pollset"); | |
224 | goto error; | |
225 | } | |
db66e574 JD |
226 | ret = lttng_poll_add(poll_set, handle->ust32_consumer, |
227 | LPOLLIN | LPOLLERR); | |
228 | if (ret < 0) { | |
229 | ERR("[rotation-thread] Failed to add ust-32 channel rotation pipe fd to pollset"); | |
230 | goto error; | |
231 | } | |
232 | ret = lttng_poll_add(poll_set, handle->ust64_consumer, | |
233 | LPOLLIN | LPOLLERR); | |
234 | if (ret < 0) { | |
235 | ERR("[rotation-thread] Failed to add ust-64 channel rotation pipe fd to pollset"); | |
236 | goto error; | |
237 | } | |
238 | if (handle->kernel_consumer >= 0) { | |
239 | ret = lttng_poll_add(poll_set, handle->kernel_consumer, | |
240 | LPOLLIN | LPOLLERR); | |
241 | if (ret < 0) { | |
242 | ERR("[rotation-thread] Failed to add kernel channel rotation pipe fd to pollset"); | |
243 | goto error; | |
244 | } | |
245 | } | |
246 | ||
247 | end: | |
248 | return ret; | |
249 | error: | |
250 | lttng_poll_clean(poll_set); | |
251 | return ret; | |
252 | } | |
253 | ||
254 | static | |
255 | void fini_thread_state(struct rotation_thread_state *state) | |
256 | { | |
257 | lttng_poll_clean(&state->events); | |
258 | cds_lfht_destroy(channel_pending_rotate_ht, NULL); | |
259 | } | |
260 | ||
261 | static | |
262 | int init_thread_state(struct rotation_thread_handle *handle, | |
263 | struct rotation_thread_state *state) | |
264 | { | |
265 | int ret; | |
266 | ||
267 | memset(state, 0, sizeof(*state)); | |
268 | lttng_poll_init(&state->events); | |
269 | ||
270 | ret = init_poll_set(&state->events, handle); | |
271 | if (ret) { | |
272 | ERR("[rotation-thread] Failed to initialize rotation thread poll set"); | |
273 | goto end; | |
274 | } | |
275 | ||
276 | channel_pending_rotate_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
277 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
278 | if (!channel_pending_rotate_ht) { | |
279 | ERR("[rotation-thread] Failed to create channel pending rotation hash table"); | |
280 | ret = -1; | |
281 | goto end; | |
282 | } | |
283 | ||
284 | end: | |
285 | return ret; | |
286 | } | |
287 | ||
288 | static | |
289 | int handle_channel_rotation_pipe(int fd, uint32_t revents, | |
290 | struct rotation_thread_handle *handle, | |
291 | struct rotation_thread_state *state) | |
292 | { | |
293 | int ret = 0; | |
294 | enum lttng_domain_type domain; | |
295 | struct rotation_channel_info *channel_info; | |
296 | struct ltt_session *session = NULL; | |
297 | uint64_t key; | |
298 | ||
299 | if (fd == handle->ust32_consumer || | |
300 | fd == handle->ust64_consumer) { | |
301 | domain = LTTNG_DOMAIN_UST; | |
302 | } else if (fd == handle->kernel_consumer) { | |
303 | domain = LTTNG_DOMAIN_KERNEL; | |
304 | } else { | |
305 | ERR("[rotation-thread] Unknown channel rotation pipe fd %d", | |
306 | fd); | |
307 | abort(); | |
308 | } | |
309 | ||
310 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
311 | ret = lttng_poll_del(&state->events, fd); | |
312 | if (ret) { | |
313 | ERR("[rotation-thread] Failed to remove consumer " | |
314 | "rotation pipe from poll set"); | |
315 | } | |
316 | goto end; | |
317 | } | |
318 | ||
319 | do { | |
320 | ret = read(fd, &key, sizeof(key)); | |
321 | } while (ret == -1 && errno == EINTR); | |
322 | if (ret != sizeof(key)) { | |
323 | ERR("[rotation-thread] Failed to read from pipe (fd = %i)", | |
324 | fd); | |
325 | ret = -1; | |
326 | goto end; | |
327 | } | |
328 | ||
329 | DBG("[rotation-thread] Received notification for chan %" PRIu64 | |
330 | ", domain %d\n", key, domain); | |
331 | ||
332 | channel_info = lookup_channel_pending(key, domain); | |
333 | if (!channel_info) { | |
334 | ERR("[rotation-thread] Failed to find channel_info (key = %" | |
335 | PRIu64 ")", key); | |
336 | ret = -1; | |
337 | goto end; | |
338 | } | |
339 | rcu_read_lock(); | |
340 | session_lock_list(); | |
341 | session = session_find_by_id(channel_info->session_id); | |
342 | if (!session) { | |
343 | /* | |
344 | * The session may have been destroyed before we had a chance to | |
345 | * perform this action, return gracefully. | |
346 | */ | |
347 | DBG("[rotation-thread] Session %" PRIu64 " not found", | |
348 | channel_info->session_id); | |
349 | ret = 0; | |
350 | goto end_unlock_session_list; | |
351 | } | |
352 | ||
353 | session_lock(session); | |
354 | if (--session->nr_chan_rotate_pending == 0) { | |
355 | time_t now = time(NULL); | |
356 | ||
357 | if (now == (time_t) -1) { | |
358 | session->rotation_status = LTTNG_ROTATION_STATUS_ERROR; | |
359 | ret = LTTNG_ERR_UNK; | |
360 | goto end_unlock_session; | |
361 | } | |
362 | ||
363 | ret = rename_complete_chunk(session, now); | |
364 | if (ret < 0) { | |
365 | ERR("Failed to rename completed rotation chunk"); | |
366 | goto end_unlock_session; | |
367 | } | |
368 | session->rotate_pending = false; | |
369 | session->rotation_status = LTTNG_ROTATION_STATUS_COMPLETED; | |
370 | session->last_chunk_start_ts = session->current_chunk_start_ts; | |
371 | DBG("Rotation completed for session %s", session->name); | |
372 | } | |
373 | ||
374 | ret = 0; | |
375 | ||
376 | end_unlock_session: | |
377 | channel_rotation_info_destroy(channel_info); | |
378 | session_unlock(session); | |
379 | end_unlock_session_list: | |
380 | session_unlock_list(); | |
381 | rcu_read_unlock(); | |
382 | end: | |
383 | return ret; | |
384 | } | |
385 | ||
386 | void *thread_rotation(void *data) | |
387 | { | |
388 | int ret; | |
389 | struct rotation_thread_handle *handle = data; | |
390 | struct rotation_thread_state state; | |
391 | ||
392 | DBG("[rotation-thread] Started rotation thread"); | |
393 | ||
394 | if (!handle) { | |
395 | ERR("[rotation-thread] Invalid thread context provided"); | |
396 | goto end; | |
397 | } | |
398 | ||
399 | rcu_register_thread(); | |
400 | rcu_thread_online(); | |
401 | ||
402 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_ROTATION); | |
403 | health_code_update(); | |
404 | ||
405 | ret = init_thread_state(handle, &state); | |
406 | if (ret) { | |
407 | goto end; | |
408 | } | |
409 | ||
410 | /* Ready to handle client connections. */ | |
411 | sessiond_notify_ready(); | |
412 | ||
413 | while (true) { | |
414 | int fd_count, i; | |
415 | ||
416 | health_poll_entry(); | |
417 | DBG("[rotation-thread] Entering poll wait"); | |
418 | ret = lttng_poll_wait(&state.events, -1); | |
419 | DBG("[rotation-thread] Poll wait returned (%i)", ret); | |
420 | health_poll_exit(); | |
421 | if (ret < 0) { | |
422 | /* | |
423 | * Restart interrupted system call. | |
424 | */ | |
425 | if (errno == EINTR) { | |
426 | continue; | |
427 | } | |
428 | ERR("[rotation-thread] Error encountered during lttng_poll_wait (%i)", ret); | |
429 | goto error; | |
430 | } | |
431 | ||
432 | fd_count = ret; | |
433 | for (i = 0; i < fd_count; i++) { | |
434 | int fd = LTTNG_POLL_GETFD(&state.events, i); | |
435 | uint32_t revents = LTTNG_POLL_GETEV(&state.events, i); | |
436 | ||
437 | DBG("[rotation-thread] Handling fd (%i) activity (%u)", | |
438 | fd, revents); | |
439 | ||
440 | if (fd == handle->thread_quit_pipe) { | |
441 | DBG("[rotation-thread] Quit pipe activity"); | |
442 | goto exit; | |
443 | } else if (fd == handle->ust32_consumer || | |
444 | fd == handle->ust64_consumer || | |
445 | fd == handle->kernel_consumer) { | |
446 | ret = handle_channel_rotation_pipe(fd, | |
447 | revents, handle, &state); | |
448 | if (ret) { | |
449 | ERR("[rotation-thread] Handle channel rotation pipe"); | |
450 | goto error; | |
451 | } | |
452 | } | |
453 | } | |
454 | } | |
455 | exit: | |
456 | error: | |
457 | DBG("[rotation-thread] Exit"); | |
458 | fini_thread_state(&state); | |
459 | health_unregister(health_sessiond); | |
460 | rcu_thread_offline(); | |
461 | rcu_unregister_thread(); | |
462 | end: | |
463 | return NULL; | |
464 | } |