2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
15 #ifndef included_vlib_threads_h
16 #define included_vlib_threads_h
18 #include <vlib/main.h>
19 #include <vppinfra/callback.h>
20 #include <linux/sched.h>
22 void vlib_set_thread_name (char *name);
24 /* arg is actually a vlib__thread_t * */
25 typedef void (vlib_thread_function_t) (void *arg);
27 typedef struct vlib_thread_registration_
29 /* constructor generated list of thread registrations */
30 struct vlib_thread_registration_ *next;
32 /* config parameters */
35 vlib_thread_function_t *function;
39 int no_data_structure_clone;
40 u32 frame_queue_nelts;
42 /* All threads of this type run on pthreads */
46 } vlib_thread_registration_t;
48 #define VLIB_LOG2_THREAD_STACK_SIZE (21)
49 #define VLIB_THREAD_STACK_SIZE (1<<VLIB_LOG2_THREAD_STACK_SIZE)
53 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
58 STRUCT_MARK (end_of_reset);
60 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
61 u32 buffer_index[VLIB_FRAME_SIZE];
62 u32 aux_data[VLIB_FRAME_SIZE];
64 vlib_frame_queue_elt_t;
68 /* First cache line */
69 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
70 volatile u32 *wait_at_barrier;
71 volatile u32 *workers_at_barrier;
73 /* Second Cache Line */
74 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
77 void (*thread_function) (void *);
78 void *thread_function_arg;
80 elog_track_t elog_track;
82 vlib_thread_registration_t *registration;
84 u64 barrier_sync_count;
85 u8 barrier_elog_enabled;
86 const char *barrier_caller;
87 const char *barrier_context;
88 volatile u32 *node_reforks_required;
89 volatile u32 wait_before_barrier;
90 volatile u32 workers_before_barrier;
91 volatile u32 done_work_before_barrier;
98 } vlib_worker_thread_t;
100 extern vlib_worker_thread_t *vlib_worker_threads;
105 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
106 vlib_frame_queue_elt_t *elts;
107 u64 vector_threshold;
111 /* modified by enqueue side */
112 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
115 /* modified by dequeue side */
116 CLIB_CACHE_LINE_ALIGN_MARK (cacheline2);
121 struct vlib_frame_queue_main_t_;
122 typedef u32 (vlib_frame_queue_dequeue_fn_t) (
123 vlib_main_t *vm, struct vlib_frame_queue_main_t_ *fqm);
124 typedef struct vlib_frame_queue_main_t_
127 u32 frame_queue_nelts;
129 vlib_frame_queue_t **vlib_frame_queues;
131 /* for frame queue tracing */
132 frame_queue_trace_t *frame_queue_traces;
133 frame_queue_nelt_counter_t *frame_queue_histogram;
134 vlib_frame_queue_dequeue_fn_t *frame_queue_dequeue_fn;
135 } vlib_frame_queue_main_t;
142 } vlib_process_signal_event_mt_args_t;
144 /* Called early, in thread 0's context */
145 clib_error_t *vlib_thread_init (vlib_main_t * vm);
147 void vlib_worker_thread_node_runtime_update (void);
149 void vlib_create_worker_threads (vlib_main_t * vm, int n,
150 void (*thread_function) (void *));
152 void vlib_worker_thread_init (vlib_worker_thread_t * w);
153 u32 vlib_frame_queue_main_init (u32 node_index, u32 frame_queue_nelts);
155 /* Check for a barrier sync request every 30ms */
156 #define BARRIER_SYNC_DELAY (0.030000)
159 /* long barrier timeout, for gdb... */
160 #define BARRIER_SYNC_TIMEOUT (600.1)
162 #define BARRIER_SYNC_TIMEOUT (1.0)
165 #define vlib_worker_thread_barrier_sync(X) {vlib_worker_thread_barrier_sync_int(X, __FUNCTION__);}
167 void vlib_worker_thread_barrier_sync_int (vlib_main_t * vm,
168 const char *func_name);
169 void vlib_worker_thread_barrier_release (vlib_main_t * vm);
170 u8 vlib_worker_thread_barrier_held (void);
171 void vlib_worker_thread_initial_barrier_sync_and_release (vlib_main_t * vm);
172 void vlib_worker_thread_node_refork (void);
174 * Wait until each of the workers has been once around the track
176 void vlib_worker_wait_one_loop (void);
178 static_always_inline uword
179 vlib_get_thread_index (void)
181 return __os_thread_index;
185 vlib_smp_unsafe_warning (void)
189 if (vlib_get_thread_index ())
190 fformat (stderr, "%s: SMP unsafe warning...\n", __FUNCTION__);
195 __foreach_vlib_main_helper (vlib_main_t *ii, vlib_main_t **p)
198 u32 index = ii - (vlib_main_t *) 0;
200 if (index >= vec_len (vlib_global_main.vlib_mains))
203 *p = vm = vlib_global_main.vlib_mains[index];
204 ASSERT (index == 0 || vm->parked_at_barrier == 1);
208 #define foreach_vlib_main() \
209 for (vlib_main_t *ii = 0, *this_vlib_main; \
210 __foreach_vlib_main_helper (ii, &this_vlib_main); ii++) \
213 #define foreach_sched_policy \
214 _(SCHED_OTHER, OTHER, "other") \
215 _(SCHED_BATCH, BATCH, "batch") \
216 _(SCHED_IDLE, IDLE, "idle") \
217 _(SCHED_FIFO, FIFO, "fifo") \
218 _(SCHED_RR, RR, "rr")
222 #define _(v,f,s) SCHED_POLICY_##f = v,
230 /* Link list of registrations, built by constructors */
231 vlib_thread_registration_t *next;
233 /* Vector of registrations, w/ non-data-structure clones at the top */
234 vlib_thread_registration_t **registrations;
236 uword *thread_registrations_by_name;
238 vlib_worker_thread_t *worker_threads;
242 /* Number of vlib_main / vnet_main clones */
245 /* Number of thread stacks to create */
248 /* Number of pthreads */
251 /* Number of threads */
254 /* Number of cores to skip, must match the core mask */
257 /* Thread prefix name */
260 /* main thread lcore */
263 /* Bitmap of available CPU cores */
264 uword *cpu_core_bitmap;
266 /* Bitmap of available CPU sockets (NUMA nodes) */
267 uword *cpu_socket_bitmap;
269 /* Worker handoff queues */
270 vlib_frame_queue_main_t *frame_queue_mains;
272 /* worker thread initialization barrier */
273 volatile u32 worker_thread_release;
275 /* scheduling policy */
278 /* scheduling policy priority */
281 /* NUMA-bound heap size */
282 uword numa_heap_size;
284 } vlib_thread_main_t;
286 extern vlib_thread_main_t vlib_thread_main;
288 #include <vlib/global_funcs.h>
290 #define VLIB_REGISTER_THREAD(x,...) \
291 __VA_ARGS__ vlib_thread_registration_t x; \
292 static void __vlib_add_thread_registration_##x (void) \
293 __attribute__((__constructor__)) ; \
294 static void __vlib_add_thread_registration_##x (void) \
296 vlib_thread_main_t * tm = &vlib_thread_main; \
300 static void __vlib_rm_thread_registration_##x (void) \
301 __attribute__((__destructor__)) ; \
302 static void __vlib_rm_thread_registration_##x (void) \
304 vlib_thread_main_t * tm = &vlib_thread_main; \
305 VLIB_REMOVE_FROM_LINKED_LIST (tm->next, &x, next); \
307 __VA_ARGS__ vlib_thread_registration_t x
312 return vlib_thread_main.n_vlib_mains - 1;
316 vlib_get_worker_thread_index (u32 worker_index)
318 return worker_index + 1;
322 vlib_get_worker_index (u32 thread_index)
324 return thread_index - 1;
328 vlib_get_current_worker_index ()
330 return vlib_get_thread_index () - 1;
334 vlib_worker_thread_barrier_check (void)
336 if (PREDICT_FALSE (*vlib_worker_threads->wait_at_barrier))
338 vlib_global_main_t *vgm = vlib_get_global_main ();
339 vlib_main_t *vm = vlib_get_main ();
340 u32 thread_index = vm->thread_index;
341 f64 t = vlib_time_now (vm);
343 if (PREDICT_FALSE (vec_len (vm->barrier_perf_callbacks) != 0))
344 clib_call_callbacks (vm->barrier_perf_callbacks, vm,
345 vm->clib_time.last_cpu_time, 0 /* enter */ );
347 if (PREDICT_FALSE (vlib_worker_threads->barrier_elog_enabled))
349 vlib_worker_thread_t *w = vlib_worker_threads + thread_index;
351 ELOG_TYPE_DECLARE (e) = {
352 .format = "barrier-wait-thread-%d",
362 ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e, w->elog_track);
363 ed->thread_index = thread_index;
368 vm = vlib_get_main ();
369 vm->parked_at_barrier = 1;
371 clib_atomic_fetch_add (vlib_worker_threads->workers_at_barrier, 1);
372 while (*vlib_worker_threads->wait_at_barrier)
376 * Recompute the offset from thread-0 time.
377 * Note that vlib_time_now adds vm->time_offset, so
378 * clear it first. Save the resulting idea of "now", to
379 * see how well we're doing. See show_clock_command_fn(...)
383 vm->time_offset = 0.0;
384 now = vlib_time_now (vm);
385 vm->time_offset = vgm->vlib_mains[0]->time_last_barrier_release - now;
386 vm->time_last_barrier_release = vlib_time_now (vm);
390 vm->parked_at_barrier = 0;
391 clib_atomic_fetch_add (vlib_worker_threads->workers_at_barrier, -1);
393 if (PREDICT_FALSE (*vlib_worker_threads->node_reforks_required))
395 if (PREDICT_FALSE (vlib_worker_threads->barrier_elog_enabled))
397 t = vlib_time_now (vm) - t;
398 vlib_worker_thread_t *w = vlib_worker_threads + thread_index;
400 ELOG_TYPE_DECLARE (e) = {
401 .format = "barrier-refork-thread-%d",
411 ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e,
413 ed->thread_index = thread_index;
416 vlib_worker_thread_node_refork ();
417 clib_atomic_fetch_add (vlib_worker_threads->node_reforks_required,
419 while (*vlib_worker_threads->node_reforks_required)
422 if (PREDICT_FALSE (vlib_worker_threads->barrier_elog_enabled))
424 t = vlib_time_now (vm) - t;
425 vlib_worker_thread_t *w = vlib_worker_threads + thread_index;
427 ELOG_TYPE_DECLARE (e) = {
428 .format = "barrier-released-thread-%d: %dus",
429 .format_args = "i4i4",
439 ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e, w->elog_track);
440 ed->thread_index = thread_index;
441 ed->duration = (int) (1000000.0 * t);
444 if (PREDICT_FALSE (vec_len (vm->barrier_perf_callbacks) != 0))
445 clib_call_callbacks (vm->barrier_perf_callbacks, vm,
446 vm->clib_time.last_cpu_time, 1 /* leave */ );
450 always_inline vlib_main_t *
451 vlib_get_worker_vlib_main (u32 worker_index)
454 vlib_thread_main_t *tm = &vlib_thread_main;
455 ASSERT (worker_index < tm->n_vlib_mains - 1);
456 vm = vlib_get_main_by_index (worker_index + 1);
462 vlib_thread_is_main_w_barrier (void)
464 return (!vlib_num_workers ()
465 || ((vlib_get_thread_index () == 0
466 && vlib_worker_threads->wait_at_barrier[0])));
469 u8 *vlib_thread_stack_init (uword thread_index);
470 extern void *rpc_call_main_thread_cb_fn;
473 vlib_process_signal_event_mt_helper (vlib_process_signal_event_mt_args_t *
475 void vlib_rpc_call_main_thread (void *function, u8 * args, u32 size);
476 void vlib_get_thread_core_numa (vlib_worker_thread_t * w, unsigned cpu_id);
477 vlib_thread_main_t *vlib_get_thread_main_not_inline (void);
480 * Force workers sync from within worker
482 * Must be paired with @ref vlib_workers_continue
484 void vlib_workers_sync (void);
486 * Release barrier after workers sync
488 void vlib_workers_continue (void);
490 #endif /* included_vlib_threads_h */
493 * fd.io coding-style-patch-verification: ON
496 * eval: (c-set-style "gnu")