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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> | |
5c408ad8 | 36 | #include <lttng/rotate-internal.h> |
db66e574 JD |
37 | |
38 | #include "rotation-thread.h" | |
39 | #include "lttng-sessiond.h" | |
40 | #include "health-sessiond.h" | |
41 | #include "rotate.h" | |
42 | #include "cmd.h" | |
43 | #include "session.h" | |
d086f507 | 44 | #include "sessiond-timer.h" |
db66e574 JD |
45 | |
46 | #include <urcu.h> | |
47 | #include <urcu/list.h> | |
48 | #include <urcu/rculfhash.h> | |
49 | ||
50 | /* | |
51 | * Store a struct rotation_channel_info for each channel that is currently | |
52 | * being rotated by the consumer. | |
53 | */ | |
54 | struct cds_lfht *channel_pending_rotate_ht; | |
55 | ||
56 | struct rotation_thread_state { | |
57 | struct lttng_poll_event events; | |
58 | }; | |
59 | ||
60 | static | |
61 | void channel_rotation_info_destroy(struct rotation_channel_info *channel_info) | |
62 | { | |
63 | assert(channel_info); | |
64 | free(channel_info); | |
65 | } | |
66 | ||
67 | static | |
68 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
69 | { | |
70 | struct rotation_channel_key *channel_key = (struct rotation_channel_key *) key; | |
71 | struct rotation_channel_info *channel_info; | |
72 | ||
73 | channel_info = caa_container_of(node, struct rotation_channel_info, | |
74 | rotate_channels_ht_node); | |
75 | ||
76 | return !!((channel_key->key == channel_info->channel_key.key) && | |
77 | (channel_key->domain == channel_info->channel_key.domain)); | |
78 | } | |
79 | ||
80 | static | |
81 | struct rotation_channel_info *lookup_channel_pending(uint64_t key, | |
82 | enum lttng_domain_type domain) | |
83 | { | |
84 | struct cds_lfht_iter iter; | |
85 | struct cds_lfht_node *node; | |
86 | struct rotation_channel_info *channel_info = NULL; | |
87 | struct rotation_channel_key channel_key = { .key = key, | |
88 | .domain = domain }; | |
89 | ||
90 | cds_lfht_lookup(channel_pending_rotate_ht, | |
91 | hash_channel_key(&channel_key), | |
92 | match_channel_info, | |
93 | &channel_key, &iter); | |
94 | node = cds_lfht_iter_get_node(&iter); | |
95 | if (!node) { | |
96 | goto end; | |
97 | } | |
98 | ||
99 | channel_info = caa_container_of(node, struct rotation_channel_info, | |
100 | rotate_channels_ht_node); | |
101 | cds_lfht_del(channel_pending_rotate_ht, node); | |
102 | end: | |
103 | return channel_info; | |
104 | } | |
105 | ||
106 | /* | |
107 | * Destroy the thread data previously created by the init function. | |
108 | */ | |
109 | void rotation_thread_handle_destroy( | |
110 | struct rotation_thread_handle *handle) | |
111 | { | |
112 | int ret; | |
113 | ||
114 | if (!handle) { | |
115 | goto end; | |
116 | } | |
117 | ||
118 | if (handle->ust32_consumer >= 0) { | |
119 | ret = close(handle->ust32_consumer); | |
120 | if (ret) { | |
121 | PERROR("close 32-bit consumer channel rotation pipe"); | |
122 | } | |
123 | } | |
124 | if (handle->ust64_consumer >= 0) { | |
125 | ret = close(handle->ust64_consumer); | |
126 | if (ret) { | |
127 | PERROR("close 64-bit consumer channel rotation pipe"); | |
128 | } | |
129 | } | |
130 | if (handle->kernel_consumer >= 0) { | |
131 | ret = close(handle->kernel_consumer); | |
132 | if (ret) { | |
133 | PERROR("close kernel consumer channel rotation pipe"); | |
134 | } | |
135 | } | |
136 | ||
137 | end: | |
138 | free(handle); | |
139 | } | |
140 | ||
141 | struct rotation_thread_handle *rotation_thread_handle_create( | |
142 | struct lttng_pipe *ust32_channel_rotate_pipe, | |
143 | struct lttng_pipe *ust64_channel_rotate_pipe, | |
144 | struct lttng_pipe *kernel_channel_rotate_pipe, | |
d086f507 JD |
145 | int thread_quit_pipe, |
146 | struct rotation_thread_timer_queue *rotation_timer_queue) | |
db66e574 JD |
147 | { |
148 | struct rotation_thread_handle *handle; | |
149 | ||
150 | handle = zmalloc(sizeof(*handle)); | |
151 | if (!handle) { | |
152 | goto end; | |
153 | } | |
154 | ||
155 | if (ust32_channel_rotate_pipe) { | |
156 | handle->ust32_consumer = | |
157 | lttng_pipe_release_readfd( | |
158 | ust32_channel_rotate_pipe); | |
159 | if (handle->ust32_consumer < 0) { | |
160 | goto error; | |
161 | } | |
162 | } else { | |
163 | handle->ust32_consumer = -1; | |
164 | } | |
165 | if (ust64_channel_rotate_pipe) { | |
166 | handle->ust64_consumer = | |
167 | lttng_pipe_release_readfd( | |
168 | ust64_channel_rotate_pipe); | |
169 | if (handle->ust64_consumer < 0) { | |
170 | goto error; | |
171 | } | |
172 | } else { | |
173 | handle->ust64_consumer = -1; | |
174 | } | |
175 | if (kernel_channel_rotate_pipe) { | |
176 | handle->kernel_consumer = | |
177 | lttng_pipe_release_readfd( | |
178 | kernel_channel_rotate_pipe); | |
179 | if (handle->kernel_consumer < 0) { | |
180 | goto error; | |
181 | } | |
182 | } else { | |
183 | handle->kernel_consumer = -1; | |
184 | } | |
185 | handle->thread_quit_pipe = thread_quit_pipe; | |
d086f507 | 186 | handle->rotation_timer_queue = rotation_timer_queue; |
db66e574 JD |
187 | |
188 | end: | |
189 | return handle; | |
190 | error: | |
191 | rotation_thread_handle_destroy(handle); | |
192 | return NULL; | |
193 | } | |
194 | ||
195 | static | |
196 | int init_poll_set(struct lttng_poll_event *poll_set, | |
197 | struct rotation_thread_handle *handle) | |
198 | { | |
199 | int ret; | |
200 | ||
201 | /* | |
d086f507 | 202 | * Create pollset with size 5: |
db66e574 | 203 | * - sessiond quit pipe |
d086f507 | 204 | * - sessiond timer pipe, |
db66e574 JD |
205 | * - consumerd (32-bit user space) channel rotate pipe, |
206 | * - consumerd (64-bit user space) channel rotate pipe, | |
207 | * - consumerd (kernel) channel rotate pipe, | |
208 | */ | |
d086f507 | 209 | ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC); |
db66e574 JD |
210 | if (ret < 0) { |
211 | goto end; | |
212 | } | |
213 | ||
214 | ret = lttng_poll_add(poll_set, handle->thread_quit_pipe, | |
215 | LPOLLIN | LPOLLERR); | |
216 | if (ret < 0) { | |
217 | ERR("[rotation-thread] Failed to add thread_quit_pipe fd to pollset"); | |
218 | goto error; | |
219 | } | |
d086f507 JD |
220 | ret = lttng_poll_add(poll_set, |
221 | lttng_pipe_get_readfd(handle->rotation_timer_queue->event_pipe), | |
222 | LPOLLIN | LPOLLERR); | |
223 | if (ret < 0) { | |
224 | ERR("[rotation-thread] Failed to add rotate_pending fd to pollset"); | |
225 | goto error; | |
226 | } | |
db66e574 JD |
227 | ret = lttng_poll_add(poll_set, handle->ust32_consumer, |
228 | LPOLLIN | LPOLLERR); | |
229 | if (ret < 0) { | |
230 | ERR("[rotation-thread] Failed to add ust-32 channel rotation pipe fd to pollset"); | |
231 | goto error; | |
232 | } | |
233 | ret = lttng_poll_add(poll_set, handle->ust64_consumer, | |
234 | LPOLLIN | LPOLLERR); | |
235 | if (ret < 0) { | |
236 | ERR("[rotation-thread] Failed to add ust-64 channel rotation pipe fd to pollset"); | |
237 | goto error; | |
238 | } | |
239 | if (handle->kernel_consumer >= 0) { | |
240 | ret = lttng_poll_add(poll_set, handle->kernel_consumer, | |
241 | LPOLLIN | LPOLLERR); | |
242 | if (ret < 0) { | |
243 | ERR("[rotation-thread] Failed to add kernel channel rotation pipe fd to pollset"); | |
244 | goto error; | |
245 | } | |
246 | } | |
247 | ||
248 | end: | |
249 | return ret; | |
250 | error: | |
251 | lttng_poll_clean(poll_set); | |
252 | return ret; | |
253 | } | |
254 | ||
255 | static | |
256 | void fini_thread_state(struct rotation_thread_state *state) | |
257 | { | |
258 | lttng_poll_clean(&state->events); | |
259 | cds_lfht_destroy(channel_pending_rotate_ht, NULL); | |
260 | } | |
261 | ||
262 | static | |
263 | int init_thread_state(struct rotation_thread_handle *handle, | |
264 | struct rotation_thread_state *state) | |
265 | { | |
266 | int ret; | |
267 | ||
268 | memset(state, 0, sizeof(*state)); | |
269 | lttng_poll_init(&state->events); | |
270 | ||
271 | ret = init_poll_set(&state->events, handle); | |
272 | if (ret) { | |
273 | ERR("[rotation-thread] Failed to initialize rotation thread poll set"); | |
274 | goto end; | |
275 | } | |
276 | ||
277 | channel_pending_rotate_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
278 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
279 | if (!channel_pending_rotate_ht) { | |
280 | ERR("[rotation-thread] Failed to create channel pending rotation hash table"); | |
281 | ret = -1; | |
282 | goto end; | |
283 | } | |
284 | ||
285 | end: | |
286 | return ret; | |
287 | } | |
288 | ||
289 | static | |
290 | int handle_channel_rotation_pipe(int fd, uint32_t revents, | |
291 | struct rotation_thread_handle *handle, | |
292 | struct rotation_thread_state *state) | |
293 | { | |
294 | int ret = 0; | |
295 | enum lttng_domain_type domain; | |
296 | struct rotation_channel_info *channel_info; | |
297 | struct ltt_session *session = NULL; | |
298 | uint64_t key; | |
299 | ||
300 | if (fd == handle->ust32_consumer || | |
301 | fd == handle->ust64_consumer) { | |
302 | domain = LTTNG_DOMAIN_UST; | |
303 | } else if (fd == handle->kernel_consumer) { | |
304 | domain = LTTNG_DOMAIN_KERNEL; | |
305 | } else { | |
306 | ERR("[rotation-thread] Unknown channel rotation pipe fd %d", | |
307 | fd); | |
308 | abort(); | |
309 | } | |
310 | ||
311 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
312 | ret = lttng_poll_del(&state->events, fd); | |
313 | if (ret) { | |
314 | ERR("[rotation-thread] Failed to remove consumer " | |
315 | "rotation pipe from poll set"); | |
316 | } | |
317 | goto end; | |
318 | } | |
319 | ||
320 | do { | |
321 | ret = read(fd, &key, sizeof(key)); | |
322 | } while (ret == -1 && errno == EINTR); | |
323 | if (ret != sizeof(key)) { | |
324 | ERR("[rotation-thread] Failed to read from pipe (fd = %i)", | |
325 | fd); | |
326 | ret = -1; | |
327 | goto end; | |
328 | } | |
329 | ||
330 | DBG("[rotation-thread] Received notification for chan %" PRIu64 | |
331 | ", domain %d\n", key, domain); | |
332 | ||
333 | channel_info = lookup_channel_pending(key, domain); | |
334 | if (!channel_info) { | |
335 | ERR("[rotation-thread] Failed to find channel_info (key = %" | |
336 | PRIu64 ")", key); | |
337 | ret = -1; | |
338 | goto end; | |
339 | } | |
340 | rcu_read_lock(); | |
341 | session_lock_list(); | |
342 | session = session_find_by_id(channel_info->session_id); | |
343 | if (!session) { | |
344 | /* | |
345 | * The session may have been destroyed before we had a chance to | |
346 | * perform this action, return gracefully. | |
347 | */ | |
348 | DBG("[rotation-thread] Session %" PRIu64 " not found", | |
349 | channel_info->session_id); | |
350 | ret = 0; | |
351 | goto end_unlock_session_list; | |
352 | } | |
353 | ||
354 | session_lock(session); | |
355 | if (--session->nr_chan_rotate_pending == 0) { | |
356 | time_t now = time(NULL); | |
357 | ||
358 | if (now == (time_t) -1) { | |
359 | session->rotation_status = LTTNG_ROTATION_STATUS_ERROR; | |
360 | ret = LTTNG_ERR_UNK; | |
361 | goto end_unlock_session; | |
362 | } | |
363 | ||
364 | ret = rename_complete_chunk(session, now); | |
365 | if (ret < 0) { | |
366 | ERR("Failed to rename completed rotation chunk"); | |
367 | goto end_unlock_session; | |
368 | } | |
369 | session->rotate_pending = false; | |
370 | session->rotation_status = LTTNG_ROTATION_STATUS_COMPLETED; | |
371 | session->last_chunk_start_ts = session->current_chunk_start_ts; | |
372 | DBG("Rotation completed for session %s", session->name); | |
373 | } | |
374 | ||
375 | ret = 0; | |
376 | ||
377 | end_unlock_session: | |
378 | channel_rotation_info_destroy(channel_info); | |
379 | session_unlock(session); | |
380 | end_unlock_session_list: | |
381 | session_unlock_list(); | |
382 | rcu_read_unlock(); | |
383 | end: | |
384 | return ret; | |
385 | } | |
386 | ||
387 | void *thread_rotation(void *data) | |
388 | { | |
389 | int ret; | |
390 | struct rotation_thread_handle *handle = data; | |
391 | struct rotation_thread_state state; | |
392 | ||
393 | DBG("[rotation-thread] Started rotation thread"); | |
394 | ||
395 | if (!handle) { | |
396 | ERR("[rotation-thread] Invalid thread context provided"); | |
397 | goto end; | |
398 | } | |
399 | ||
400 | rcu_register_thread(); | |
401 | rcu_thread_online(); | |
402 | ||
403 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_ROTATION); | |
404 | health_code_update(); | |
405 | ||
406 | ret = init_thread_state(handle, &state); | |
407 | if (ret) { | |
408 | goto end; | |
409 | } | |
410 | ||
411 | /* Ready to handle client connections. */ | |
412 | sessiond_notify_ready(); | |
413 | ||
414 | while (true) { | |
415 | int fd_count, i; | |
416 | ||
417 | health_poll_entry(); | |
418 | DBG("[rotation-thread] Entering poll wait"); | |
419 | ret = lttng_poll_wait(&state.events, -1); | |
420 | DBG("[rotation-thread] Poll wait returned (%i)", ret); | |
421 | health_poll_exit(); | |
422 | if (ret < 0) { | |
423 | /* | |
424 | * Restart interrupted system call. | |
425 | */ | |
426 | if (errno == EINTR) { | |
427 | continue; | |
428 | } | |
429 | ERR("[rotation-thread] Error encountered during lttng_poll_wait (%i)", ret); | |
430 | goto error; | |
431 | } | |
432 | ||
433 | fd_count = ret; | |
434 | for (i = 0; i < fd_count; i++) { | |
435 | int fd = LTTNG_POLL_GETFD(&state.events, i); | |
436 | uint32_t revents = LTTNG_POLL_GETEV(&state.events, i); | |
437 | ||
438 | DBG("[rotation-thread] Handling fd (%i) activity (%u)", | |
439 | fd, revents); | |
440 | ||
441 | if (fd == handle->thread_quit_pipe) { | |
442 | DBG("[rotation-thread] Quit pipe activity"); | |
443 | goto exit; | |
444 | } else if (fd == handle->ust32_consumer || | |
445 | fd == handle->ust64_consumer || | |
446 | fd == handle->kernel_consumer) { | |
447 | ret = handle_channel_rotation_pipe(fd, | |
448 | revents, handle, &state); | |
449 | if (ret) { | |
450 | ERR("[rotation-thread] Handle channel rotation pipe"); | |
451 | goto error; | |
452 | } | |
453 | } | |
454 | } | |
455 | } | |
456 | exit: | |
457 | error: | |
458 | DBG("[rotation-thread] Exit"); | |
459 | fini_thread_state(&state); | |
460 | health_unregister(health_sessiond); | |
461 | rcu_thread_offline(); | |
462 | rcu_unregister_thread(); | |
463 | end: | |
464 | return NULL; | |
465 | } |