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 * Flush worker's pending rpc requests to main thread's rpc queue
180 void vlib_worker_flush_pending_rpc_requests (vlib_main_t *vm);
182 static_always_inline uword
183 vlib_get_thread_index (void)
185 return __os_thread_index;
189 vlib_smp_unsafe_warning (void)
193 if (vlib_get_thread_index ())
194 fformat (stderr, "%s: SMP unsafe warning...\n", __FUNCTION__);
199 __foreach_vlib_main_helper (vlib_main_t *ii, vlib_main_t **p)
202 u32 index = ii - (vlib_main_t *) 0;
204 if (index >= vec_len (vlib_global_main.vlib_mains))
207 *p = vm = vlib_global_main.vlib_mains[index];
208 ASSERT (index == 0 || vm->parked_at_barrier == 1);
212 #define foreach_vlib_main() \
213 for (vlib_main_t *ii = 0, *this_vlib_main; \
214 __foreach_vlib_main_helper (ii, &this_vlib_main); ii++) \
217 #define foreach_sched_policy \
218 _(SCHED_OTHER, OTHER, "other") \
219 _(SCHED_BATCH, BATCH, "batch") \
220 _(SCHED_IDLE, IDLE, "idle") \
221 _(SCHED_FIFO, FIFO, "fifo") \
222 _(SCHED_RR, RR, "rr")
226 #define _(v,f,s) SCHED_POLICY_##f = v,
234 /* Link list of registrations, built by constructors */
235 vlib_thread_registration_t *next;
237 /* Vector of registrations, w/ non-data-structure clones at the top */
238 vlib_thread_registration_t **registrations;
240 uword *thread_registrations_by_name;
242 vlib_worker_thread_t *worker_threads;
246 /* Number of vlib_main / vnet_main clones */
249 /* Number of thread stacks to create */
252 /* Number of pthreads */
255 /* Number of threads */
258 /* Number of cores to skip, must match the core mask */
261 /* Thread prefix name */
264 /* main thread lcore */
267 /* Bitmap of available CPU cores */
268 uword *cpu_core_bitmap;
270 /* Bitmap of available CPU sockets (NUMA nodes) */
271 uword *cpu_socket_bitmap;
273 /* Worker handoff queues */
274 vlib_frame_queue_main_t *frame_queue_mains;
276 /* worker thread initialization barrier */
277 volatile u32 worker_thread_release;
279 /* scheduling policy */
282 /* scheduling policy priority */
285 /* NUMA-bound heap size */
286 uword numa_heap_size;
288 } vlib_thread_main_t;
290 extern vlib_thread_main_t vlib_thread_main;
292 #include <vlib/global_funcs.h>
294 #define VLIB_REGISTER_THREAD(x,...) \
295 __VA_ARGS__ vlib_thread_registration_t x; \
296 static void __vlib_add_thread_registration_##x (void) \
297 __attribute__((__constructor__)) ; \
298 static void __vlib_add_thread_registration_##x (void) \
300 vlib_thread_main_t * tm = &vlib_thread_main; \
304 static void __vlib_rm_thread_registration_##x (void) \
305 __attribute__((__destructor__)) ; \
306 static void __vlib_rm_thread_registration_##x (void) \
308 vlib_thread_main_t * tm = &vlib_thread_main; \
309 VLIB_REMOVE_FROM_LINKED_LIST (tm->next, &x, next); \
311 __VA_ARGS__ vlib_thread_registration_t x
316 return vlib_thread_main.n_vlib_mains - 1;
320 vlib_get_worker_thread_index (u32 worker_index)
322 return worker_index + 1;
326 vlib_get_worker_index (u32 thread_index)
328 return thread_index - 1;
332 vlib_get_current_worker_index ()
334 return vlib_get_thread_index () - 1;
338 vlib_worker_thread_barrier_check (void)
340 if (PREDICT_FALSE (*vlib_worker_threads->wait_at_barrier))
342 vlib_global_main_t *vgm = vlib_get_global_main ();
343 vlib_main_t *vm = vlib_get_main ();
344 u32 thread_index = vm->thread_index;
345 f64 t = vlib_time_now (vm);
347 if (PREDICT_FALSE (vec_len (vm->barrier_perf_callbacks) != 0))
348 clib_call_callbacks (vm->barrier_perf_callbacks, vm,
349 vm->clib_time.last_cpu_time, 0 /* enter */ );
351 if (PREDICT_FALSE (vlib_worker_threads->barrier_elog_enabled))
353 vlib_worker_thread_t *w = vlib_worker_threads + thread_index;
355 ELOG_TYPE_DECLARE (e) = {
356 .format = "barrier-wait-thread-%d",
366 ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e, w->elog_track);
367 ed->thread_index = thread_index;
372 vm = vlib_get_main ();
373 vm->parked_at_barrier = 1;
375 clib_atomic_fetch_add (vlib_worker_threads->workers_at_barrier, 1);
376 while (*vlib_worker_threads->wait_at_barrier)
380 * Recompute the offset from thread-0 time.
381 * Note that vlib_time_now adds vm->time_offset, so
382 * clear it first. Save the resulting idea of "now", to
383 * see how well we're doing. See show_clock_command_fn(...)
387 vm->time_offset = 0.0;
388 now = vlib_time_now (vm);
389 vm->time_offset = vgm->vlib_mains[0]->time_last_barrier_release - now;
390 vm->time_last_barrier_release = vlib_time_now (vm);
394 vm->parked_at_barrier = 0;
395 clib_atomic_fetch_add (vlib_worker_threads->workers_at_barrier, -1);
397 if (PREDICT_FALSE (*vlib_worker_threads->node_reforks_required))
399 if (PREDICT_FALSE (vlib_worker_threads->barrier_elog_enabled))
401 t = vlib_time_now (vm) - t;
402 vlib_worker_thread_t *w = vlib_worker_threads + thread_index;
404 ELOG_TYPE_DECLARE (e) = {
405 .format = "barrier-refork-thread-%d",
415 ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e,
417 ed->thread_index = thread_index;
420 vlib_worker_thread_node_refork ();
421 clib_atomic_fetch_add (vlib_worker_threads->node_reforks_required,
423 while (*vlib_worker_threads->node_reforks_required)
426 if (PREDICT_FALSE (vlib_worker_threads->barrier_elog_enabled))
428 t = vlib_time_now (vm) - t;
429 vlib_worker_thread_t *w = vlib_worker_threads + thread_index;
431 ELOG_TYPE_DECLARE (e) = {
432 .format = "barrier-released-thread-%d: %dus",
433 .format_args = "i4i4",
443 ed = ELOG_TRACK_DATA (&vlib_global_main.elog_main, e, w->elog_track);
444 ed->thread_index = thread_index;
445 ed->duration = (int) (1000000.0 * t);
448 if (PREDICT_FALSE (vec_len (vm->barrier_perf_callbacks) != 0))
449 clib_call_callbacks (vm->barrier_perf_callbacks, vm,
450 vm->clib_time.last_cpu_time, 1 /* leave */ );
454 always_inline vlib_main_t *
455 vlib_get_worker_vlib_main (u32 worker_index)
458 vlib_thread_main_t *tm = &vlib_thread_main;
459 ASSERT (worker_index < tm->n_vlib_mains - 1);
460 vm = vlib_get_main_by_index (worker_index + 1);
466 vlib_thread_is_main_w_barrier (void)
468 return (!vlib_num_workers ()
469 || ((vlib_get_thread_index () == 0
470 && vlib_worker_threads->wait_at_barrier[0])));
473 u8 *vlib_thread_stack_init (uword thread_index);
474 extern void *rpc_call_main_thread_cb_fn;
477 vlib_process_signal_event_mt_helper (vlib_process_signal_event_mt_args_t *
479 void vlib_rpc_call_main_thread (void *function, u8 * args, u32 size);
480 void vlib_get_thread_core_numa (vlib_worker_thread_t * w, unsigned cpu_id);
481 vlib_thread_main_t *vlib_get_thread_main_not_inline (void);
484 * Force workers sync from within worker
486 * Must be paired with @ref vlib_workers_continue
488 void vlib_workers_sync (void);
490 * Release barrier after workers sync
492 void vlib_workers_continue (void);
494 #endif /* included_vlib_threads_h */
497 * fd.io coding-style-patch-verification: ON
500 * eval: (c-set-style "gnu")