1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @brief Deterministic Priority Affinity SMP Scheduler Implementation |
---|
5 | * |
---|
6 | * @ingroup ScoreSchedulerPriorityAffinitySMP |
---|
7 | */ |
---|
8 | |
---|
9 | /* |
---|
10 | * COPYRIGHT (c) 2014. |
---|
11 | * On-Line Applications Research Corporation (OAR). |
---|
12 | * |
---|
13 | * The license and distribution terms for this file may be |
---|
14 | * found in the file LICENSE in this distribution or at |
---|
15 | * http://www.rtems.org/license/LICENSE. |
---|
16 | */ |
---|
17 | |
---|
18 | #if HAVE_CONFIG_H |
---|
19 | #include "config.h" |
---|
20 | #endif |
---|
21 | |
---|
22 | #include <rtems/score/schedulerpriorityaffinitysmp.h> |
---|
23 | #include <rtems/score/schedulerpriorityimpl.h> |
---|
24 | #include <rtems/score/schedulersmpimpl.h> |
---|
25 | #include <rtems/score/schedulerprioritysmpimpl.h> |
---|
26 | #include <rtems/score/priority.h> |
---|
27 | |
---|
28 | /* |
---|
29 | * The following methods which initially were static in schedulerprioritysmp.c |
---|
30 | * are shared with this scheduler. They are now public so they can be shared. |
---|
31 | * |
---|
32 | * + _Scheduler_priority_SMP_Get_self |
---|
33 | * + _Scheduler_priority_SMP_Insert_ready_fifo |
---|
34 | * + _Scheduler_priority_SMP_Insert_ready_lifo |
---|
35 | * + _Scheduler_priority_SMP_Thread_get_node |
---|
36 | * + _Scheduler_priority_SMP_Move_from_scheduled_to_ready |
---|
37 | * + _Scheduler_priority_SMP_Move_from_ready_to_scheduled |
---|
38 | * + _Scheduler_priority_SMP_Extract_from_ready |
---|
39 | * + _Scheduler_priority_SMP_Do_update |
---|
40 | */ |
---|
41 | |
---|
42 | static bool _Scheduler_priority_affinity_SMP_Insert_priority_lifo_order( |
---|
43 | const Chain_Node *to_insert, |
---|
44 | const Chain_Node *next |
---|
45 | ) |
---|
46 | { |
---|
47 | return next != NULL |
---|
48 | && _Scheduler_SMP_Insert_priority_lifo_order( to_insert, next ); |
---|
49 | } |
---|
50 | |
---|
51 | static bool _Scheduler_priority_affinity_SMP_Insert_priority_fifo_order( |
---|
52 | const Chain_Node *to_insert, |
---|
53 | const Chain_Node *next |
---|
54 | ) |
---|
55 | { |
---|
56 | return next != NULL |
---|
57 | && _Scheduler_SMP_Insert_priority_fifo_order( to_insert, next ); |
---|
58 | } |
---|
59 | |
---|
60 | static Scheduler_priority_affinity_SMP_Node * |
---|
61 | _Scheduler_priority_affinity_SMP_Node_downcast( |
---|
62 | Scheduler_Node *node |
---|
63 | ) |
---|
64 | { |
---|
65 | return (Scheduler_priority_affinity_SMP_Node *) node; |
---|
66 | } |
---|
67 | |
---|
68 | /* |
---|
69 | * This method initializes the scheduler control information for |
---|
70 | * this scheduler instance. |
---|
71 | */ |
---|
72 | void _Scheduler_priority_affinity_SMP_Node_initialize( |
---|
73 | const Scheduler_Control *scheduler, |
---|
74 | Scheduler_Node *node, |
---|
75 | Thread_Control *the_thread, |
---|
76 | Priority_Control priority |
---|
77 | ) |
---|
78 | { |
---|
79 | Scheduler_priority_affinity_SMP_Node *the_node; |
---|
80 | |
---|
81 | _Scheduler_priority_SMP_Node_initialize( scheduler, node, the_thread, priority ); |
---|
82 | |
---|
83 | /* |
---|
84 | * All we add is affinity information to the basic SMP node. |
---|
85 | */ |
---|
86 | the_node = _Scheduler_priority_affinity_SMP_Node_downcast( node ); |
---|
87 | _Processor_mask_To_cpu_set_t( |
---|
88 | _SMP_Get_online_processors(), |
---|
89 | sizeof( the_node->affinity ), |
---|
90 | &the_node->affinity |
---|
91 | ); |
---|
92 | } |
---|
93 | |
---|
94 | /* |
---|
95 | * This method is unique to this scheduler because it takes into |
---|
96 | * account affinity as it determines the highest ready thread. |
---|
97 | * Since this is used to pick a new thread to replace the victim, |
---|
98 | * the highest ready thread must have affinity such that it can |
---|
99 | * be executed on the victim's processor. |
---|
100 | */ |
---|
101 | static Scheduler_Node *_Scheduler_priority_affinity_SMP_Get_highest_ready( |
---|
102 | Scheduler_Context *context, |
---|
103 | Scheduler_Node *victim |
---|
104 | ) |
---|
105 | { |
---|
106 | Scheduler_priority_SMP_Context *self = |
---|
107 | _Scheduler_priority_SMP_Get_self( context ); |
---|
108 | Priority_Control index; |
---|
109 | Scheduler_Node *highest = NULL; |
---|
110 | Thread_Control *victim_thread; |
---|
111 | uint32_t victim_cpu_index; |
---|
112 | Scheduler_priority_affinity_SMP_Node *node; |
---|
113 | |
---|
114 | /* |
---|
115 | * This is done when we need to check if reevaluations are needed. |
---|
116 | */ |
---|
117 | if ( victim == NULL ) { |
---|
118 | node = (Scheduler_priority_affinity_SMP_Node *) |
---|
119 | _Scheduler_priority_Ready_queue_first( |
---|
120 | &self->Bit_map, |
---|
121 | &self->Ready[ 0 ] |
---|
122 | ); |
---|
123 | |
---|
124 | return &node->Base.Base.Base; |
---|
125 | } |
---|
126 | |
---|
127 | victim_thread = _Scheduler_Node_get_owner( victim ); |
---|
128 | victim_cpu_index = _Per_CPU_Get_index( _Thread_Get_CPU( victim_thread ) ); |
---|
129 | |
---|
130 | /** |
---|
131 | * @todo The deterministic priority scheduler structure is optimized |
---|
132 | * for insertion, extraction, and finding the highest priority |
---|
133 | * thread. Scanning the list of ready threads is not a purpose |
---|
134 | * for which it was optimized. There are optimizations to be |
---|
135 | * made in this loop. |
---|
136 | * |
---|
137 | * + by checking the major bit, we could potentially skip entire |
---|
138 | * groups of 16. |
---|
139 | * |
---|
140 | * When using this scheduler as implemented, the application's |
---|
141 | * choice of numeric priorities and their distribution can have |
---|
142 | * an impact on performance. |
---|
143 | */ |
---|
144 | for ( index = _Priority_bit_map_Get_highest( &self->Bit_map ) ; |
---|
145 | index <= PRIORITY_MAXIMUM; |
---|
146 | index++ ) |
---|
147 | { |
---|
148 | Chain_Control *chain = &self->Ready[index]; |
---|
149 | Chain_Node *chain_node; |
---|
150 | for ( chain_node = _Chain_First( chain ); |
---|
151 | chain_node != _Chain_Immutable_tail( chain ) ; |
---|
152 | chain_node = _Chain_Next( chain_node ) ) |
---|
153 | { |
---|
154 | node = (Scheduler_priority_affinity_SMP_Node *) chain_node; |
---|
155 | |
---|
156 | /* |
---|
157 | * Can this thread run on this CPU? |
---|
158 | */ |
---|
159 | if ( CPU_ISSET( (int) victim_cpu_index, &node->affinity ) ) { |
---|
160 | highest = &node->Base.Base.Base; |
---|
161 | break; |
---|
162 | } |
---|
163 | } |
---|
164 | if ( highest ) |
---|
165 | break; |
---|
166 | } |
---|
167 | |
---|
168 | _Assert( highest != NULL ); |
---|
169 | |
---|
170 | return highest; |
---|
171 | } |
---|
172 | |
---|
173 | /* |
---|
174 | * This method is very similar to _Scheduler_priority_affinity_SMP_Block |
---|
175 | * but has the difference that is invokes this scheduler's |
---|
176 | * get_highest_ready() support method. |
---|
177 | */ |
---|
178 | void _Scheduler_priority_affinity_SMP_Block( |
---|
179 | const Scheduler_Control *scheduler, |
---|
180 | Thread_Control *thread, |
---|
181 | Scheduler_Node *node |
---|
182 | ) |
---|
183 | { |
---|
184 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
---|
185 | |
---|
186 | _Scheduler_SMP_Block( |
---|
187 | context, |
---|
188 | thread, |
---|
189 | node, |
---|
190 | _Scheduler_priority_SMP_Extract_from_ready, |
---|
191 | _Scheduler_priority_affinity_SMP_Get_highest_ready, |
---|
192 | _Scheduler_priority_SMP_Move_from_ready_to_scheduled, |
---|
193 | _Scheduler_SMP_Allocate_processor_exact |
---|
194 | ); |
---|
195 | |
---|
196 | /* |
---|
197 | * Since this removed a single thread from the scheduled set |
---|
198 | * and selected the most appropriate thread from the ready |
---|
199 | * set to replace it, there should be no need for thread |
---|
200 | * migrations. |
---|
201 | */ |
---|
202 | } |
---|
203 | |
---|
204 | /* |
---|
205 | * This method is unique to this scheduler because it must take into |
---|
206 | * account affinity as it searches for the lowest priority scheduled |
---|
207 | * thread. It ignores those which cannot be replaced by the filter |
---|
208 | * thread because the potential victim thread does not have affinity |
---|
209 | * for that processor. |
---|
210 | */ |
---|
211 | static Scheduler_Node * _Scheduler_priority_affinity_SMP_Get_lowest_scheduled( |
---|
212 | Scheduler_Context *context, |
---|
213 | Scheduler_Node *filter_base, |
---|
214 | Chain_Node_order order |
---|
215 | ) |
---|
216 | { |
---|
217 | Scheduler_SMP_Context *self = _Scheduler_SMP_Get_self( context ); |
---|
218 | Scheduler_Node *lowest_scheduled = NULL; |
---|
219 | Chain_Control *scheduled = &self->Scheduled; |
---|
220 | Chain_Node *chain_node; |
---|
221 | Scheduler_priority_affinity_SMP_Node *filter = |
---|
222 | _Scheduler_priority_affinity_SMP_Node_downcast( filter_base ); |
---|
223 | |
---|
224 | for ( chain_node = _Chain_Last( scheduled ); |
---|
225 | chain_node != _Chain_Immutable_head( scheduled ) ; |
---|
226 | chain_node = _Chain_Previous( chain_node ) ) { |
---|
227 | Scheduler_priority_affinity_SMP_Node *node; |
---|
228 | Thread_Control *thread; |
---|
229 | uint32_t cpu_index; |
---|
230 | |
---|
231 | node = (Scheduler_priority_affinity_SMP_Node *) chain_node; |
---|
232 | |
---|
233 | /* |
---|
234 | * If we didn't find a thread which is of equal or lower importance |
---|
235 | * than filter thread is, then we can't schedule the filter thread |
---|
236 | * to execute. |
---|
237 | */ |
---|
238 | if ( |
---|
239 | (*order)( |
---|
240 | &node->Base.Base.Base.Node.Chain, |
---|
241 | &filter->Base.Base.Base.Node.Chain |
---|
242 | ) |
---|
243 | ) { |
---|
244 | break; |
---|
245 | } |
---|
246 | |
---|
247 | /* cpu_index is the processor number thread is executing on */ |
---|
248 | thread = _Scheduler_Node_get_owner( &node->Base.Base.Base ); |
---|
249 | cpu_index = _Per_CPU_Get_index( _Thread_Get_CPU( thread ) ); |
---|
250 | |
---|
251 | if ( CPU_ISSET( (int) cpu_index, &filter->affinity ) ) { |
---|
252 | lowest_scheduled = &node->Base.Base.Base; |
---|
253 | break; |
---|
254 | } |
---|
255 | |
---|
256 | } |
---|
257 | |
---|
258 | return lowest_scheduled; |
---|
259 | } |
---|
260 | |
---|
261 | /* |
---|
262 | * This method is unique to this scheduler because it must pass |
---|
263 | * _Scheduler_priority_affinity_SMP_Get_lowest_scheduled into |
---|
264 | * _Scheduler_SMP_Enqueue_ordered. |
---|
265 | */ |
---|
266 | static bool _Scheduler_priority_affinity_SMP_Enqueue_fifo( |
---|
267 | Scheduler_Context *context, |
---|
268 | Scheduler_Node *node |
---|
269 | ) |
---|
270 | { |
---|
271 | return _Scheduler_SMP_Enqueue_ordered( |
---|
272 | context, |
---|
273 | node, |
---|
274 | _Scheduler_priority_affinity_SMP_Insert_priority_fifo_order, |
---|
275 | _Scheduler_priority_SMP_Insert_ready_fifo, |
---|
276 | _Scheduler_SMP_Insert_scheduled_fifo, |
---|
277 | _Scheduler_priority_SMP_Move_from_scheduled_to_ready, |
---|
278 | _Scheduler_priority_affinity_SMP_Get_lowest_scheduled, |
---|
279 | _Scheduler_SMP_Allocate_processor_exact |
---|
280 | ); |
---|
281 | } |
---|
282 | |
---|
283 | /* |
---|
284 | * This method is invoked at the end of certain scheduling operations |
---|
285 | * to ensure that the highest priority ready thread cannot be scheduled |
---|
286 | * to execute. When we schedule with affinity, there is the possibility |
---|
287 | * that we need to migrate a thread to another core to ensure that the |
---|
288 | * highest priority ready threads are in fact scheduled. |
---|
289 | */ |
---|
290 | static void _Scheduler_priority_affinity_SMP_Check_for_migrations( |
---|
291 | Scheduler_Context *context |
---|
292 | ) |
---|
293 | { |
---|
294 | Scheduler_priority_SMP_Context *self; |
---|
295 | Scheduler_Node *lowest_scheduled; |
---|
296 | Scheduler_Node *highest_ready; |
---|
297 | |
---|
298 | self = _Scheduler_priority_SMP_Get_self( context ); |
---|
299 | |
---|
300 | while (1) { |
---|
301 | if ( _Priority_bit_map_Is_empty( &self->Bit_map ) ) { |
---|
302 | /* Nothing to do */ |
---|
303 | break; |
---|
304 | } |
---|
305 | |
---|
306 | highest_ready = |
---|
307 | _Scheduler_priority_affinity_SMP_Get_highest_ready( context, NULL ); |
---|
308 | |
---|
309 | lowest_scheduled = |
---|
310 | _Scheduler_priority_affinity_SMP_Get_lowest_scheduled( |
---|
311 | context, |
---|
312 | highest_ready, |
---|
313 | _Scheduler_SMP_Insert_priority_lifo_order |
---|
314 | ); |
---|
315 | |
---|
316 | /* |
---|
317 | * If we can't find a thread to displace from the scheduled set, |
---|
318 | * then we have placed all the highest priority threads possible |
---|
319 | * in the scheduled set. |
---|
320 | * |
---|
321 | * We found the absolute highest priority thread without |
---|
322 | * considering affinity. But now we have to consider that thread's |
---|
323 | * affinity as we look to place it. |
---|
324 | */ |
---|
325 | if ( lowest_scheduled == NULL ) |
---|
326 | break; |
---|
327 | |
---|
328 | /* |
---|
329 | * But if we found a thread which is lower priority than one |
---|
330 | * in the ready set, then we need to swap them out. |
---|
331 | */ |
---|
332 | |
---|
333 | _Scheduler_priority_SMP_Extract_from_ready( context, highest_ready ); |
---|
334 | _Scheduler_SMP_Enqueue_to_scheduled( |
---|
335 | context, |
---|
336 | highest_ready, |
---|
337 | lowest_scheduled, |
---|
338 | _Scheduler_SMP_Insert_scheduled_fifo, |
---|
339 | _Scheduler_priority_SMP_Move_from_scheduled_to_ready, |
---|
340 | _Scheduler_SMP_Allocate_processor_exact |
---|
341 | ); |
---|
342 | } |
---|
343 | } |
---|
344 | |
---|
345 | /* |
---|
346 | * This is the public scheduler specific Unblock operation. |
---|
347 | */ |
---|
348 | void _Scheduler_priority_affinity_SMP_Unblock( |
---|
349 | const Scheduler_Control *scheduler, |
---|
350 | Thread_Control *thread, |
---|
351 | Scheduler_Node *node |
---|
352 | ) |
---|
353 | { |
---|
354 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
---|
355 | |
---|
356 | _Scheduler_SMP_Unblock( |
---|
357 | context, |
---|
358 | thread, |
---|
359 | node, |
---|
360 | _Scheduler_priority_SMP_Do_update, |
---|
361 | _Scheduler_priority_affinity_SMP_Enqueue_fifo |
---|
362 | ); |
---|
363 | |
---|
364 | /* |
---|
365 | * Perform any thread migrations that are needed due to these changes. |
---|
366 | */ |
---|
367 | _Scheduler_priority_affinity_SMP_Check_for_migrations( context ); |
---|
368 | } |
---|
369 | |
---|
370 | /* |
---|
371 | * This is unique to this scheduler because it passes scheduler specific |
---|
372 | * get_lowest_scheduled helper to _Scheduler_SMP_Enqueue_ordered. |
---|
373 | */ |
---|
374 | static bool _Scheduler_priority_affinity_SMP_Enqueue_ordered( |
---|
375 | Scheduler_Context *context, |
---|
376 | Scheduler_Node *node, |
---|
377 | Chain_Node_order order, |
---|
378 | Scheduler_SMP_Insert insert_ready, |
---|
379 | Scheduler_SMP_Insert insert_scheduled |
---|
380 | ) |
---|
381 | { |
---|
382 | return _Scheduler_SMP_Enqueue_ordered( |
---|
383 | context, |
---|
384 | node, |
---|
385 | order, |
---|
386 | insert_ready, |
---|
387 | insert_scheduled, |
---|
388 | _Scheduler_priority_SMP_Move_from_scheduled_to_ready, |
---|
389 | _Scheduler_priority_affinity_SMP_Get_lowest_scheduled, |
---|
390 | _Scheduler_SMP_Allocate_processor_exact |
---|
391 | ); |
---|
392 | } |
---|
393 | |
---|
394 | /* |
---|
395 | * This is unique to this scheduler because it is on the path |
---|
396 | * to _Scheduler_priority_affinity_SMP_Enqueue_ordered() which |
---|
397 | * invokes a scheduler unique get_lowest_scheduled helper. |
---|
398 | */ |
---|
399 | static bool _Scheduler_priority_affinity_SMP_Enqueue_lifo( |
---|
400 | Scheduler_Context *context, |
---|
401 | Scheduler_Node *node |
---|
402 | ) |
---|
403 | { |
---|
404 | return _Scheduler_priority_affinity_SMP_Enqueue_ordered( |
---|
405 | context, |
---|
406 | node, |
---|
407 | _Scheduler_priority_affinity_SMP_Insert_priority_lifo_order, |
---|
408 | _Scheduler_priority_SMP_Insert_ready_lifo, |
---|
409 | _Scheduler_SMP_Insert_scheduled_lifo |
---|
410 | ); |
---|
411 | } |
---|
412 | |
---|
413 | /* |
---|
414 | * This method is unique to this scheduler because it must |
---|
415 | * invoke _Scheduler_SMP_Enqueue_scheduled_ordered() with |
---|
416 | * this scheduler's get_highest_ready() helper. |
---|
417 | */ |
---|
418 | static bool _Scheduler_priority_affinity_SMP_Enqueue_scheduled_ordered( |
---|
419 | Scheduler_Context *context, |
---|
420 | Scheduler_Node *node, |
---|
421 | Chain_Node_order order, |
---|
422 | Scheduler_SMP_Insert insert_ready, |
---|
423 | Scheduler_SMP_Insert insert_scheduled |
---|
424 | ) |
---|
425 | { |
---|
426 | return _Scheduler_SMP_Enqueue_scheduled_ordered( |
---|
427 | context, |
---|
428 | node, |
---|
429 | order, |
---|
430 | _Scheduler_priority_SMP_Extract_from_ready, |
---|
431 | _Scheduler_priority_affinity_SMP_Get_highest_ready, |
---|
432 | insert_ready, |
---|
433 | insert_scheduled, |
---|
434 | _Scheduler_priority_SMP_Move_from_ready_to_scheduled, |
---|
435 | _Scheduler_SMP_Allocate_processor_exact |
---|
436 | ); |
---|
437 | } |
---|
438 | |
---|
439 | /* |
---|
440 | * This is unique to this scheduler because it is on the path |
---|
441 | * to _Scheduler_priority_affinity_SMP_Enqueue_scheduled__ordered() which |
---|
442 | * invokes a scheduler unique get_lowest_scheduled helper. |
---|
443 | */ |
---|
444 | static bool _Scheduler_priority_affinity_SMP_Enqueue_scheduled_lifo( |
---|
445 | Scheduler_Context *context, |
---|
446 | Scheduler_Node *node |
---|
447 | ) |
---|
448 | { |
---|
449 | return _Scheduler_priority_affinity_SMP_Enqueue_scheduled_ordered( |
---|
450 | context, |
---|
451 | node, |
---|
452 | _Scheduler_SMP_Insert_priority_lifo_order, |
---|
453 | _Scheduler_priority_SMP_Insert_ready_lifo, |
---|
454 | _Scheduler_SMP_Insert_scheduled_lifo |
---|
455 | ); |
---|
456 | } |
---|
457 | |
---|
458 | /* |
---|
459 | * This is unique to this scheduler because it is on the path |
---|
460 | * to _Scheduler_priority_affinity_SMP_Enqueue_scheduled__ordered() which |
---|
461 | * invokes a scheduler unique get_lowest_scheduled helper. |
---|
462 | */ |
---|
463 | static bool _Scheduler_priority_affinity_SMP_Enqueue_scheduled_fifo( |
---|
464 | Scheduler_Context *context, |
---|
465 | Scheduler_Node *node |
---|
466 | ) |
---|
467 | { |
---|
468 | return _Scheduler_priority_affinity_SMP_Enqueue_scheduled_ordered( |
---|
469 | context, |
---|
470 | node, |
---|
471 | _Scheduler_SMP_Insert_priority_fifo_order, |
---|
472 | _Scheduler_priority_SMP_Insert_ready_fifo, |
---|
473 | _Scheduler_SMP_Insert_scheduled_fifo |
---|
474 | ); |
---|
475 | } |
---|
476 | |
---|
477 | static bool _Scheduler_priority_affinity_SMP_Do_ask_for_help( |
---|
478 | Scheduler_Context *context, |
---|
479 | Thread_Control *the_thread, |
---|
480 | Scheduler_Node *node |
---|
481 | ) |
---|
482 | { |
---|
483 | return _Scheduler_SMP_Ask_for_help( |
---|
484 | context, |
---|
485 | the_thread, |
---|
486 | node, |
---|
487 | _Scheduler_SMP_Insert_priority_lifo_order, |
---|
488 | _Scheduler_priority_SMP_Insert_ready_lifo, |
---|
489 | _Scheduler_SMP_Insert_scheduled_lifo, |
---|
490 | _Scheduler_priority_SMP_Move_from_scheduled_to_ready, |
---|
491 | _Scheduler_SMP_Get_lowest_scheduled, |
---|
492 | _Scheduler_SMP_Allocate_processor_lazy |
---|
493 | ); |
---|
494 | } |
---|
495 | |
---|
496 | void _Scheduler_priority_affinity_SMP_Update_priority( |
---|
497 | const Scheduler_Control *scheduler, |
---|
498 | Thread_Control *thread, |
---|
499 | Scheduler_Node *node |
---|
500 | ) |
---|
501 | { |
---|
502 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
---|
503 | |
---|
504 | _Scheduler_SMP_Update_priority( |
---|
505 | context, |
---|
506 | thread, |
---|
507 | node, |
---|
508 | _Scheduler_priority_SMP_Extract_from_ready, |
---|
509 | _Scheduler_priority_SMP_Do_update, |
---|
510 | _Scheduler_priority_affinity_SMP_Enqueue_fifo, |
---|
511 | _Scheduler_priority_affinity_SMP_Enqueue_lifo, |
---|
512 | _Scheduler_priority_affinity_SMP_Enqueue_scheduled_fifo, |
---|
513 | _Scheduler_priority_affinity_SMP_Enqueue_scheduled_lifo, |
---|
514 | _Scheduler_priority_affinity_SMP_Do_ask_for_help |
---|
515 | ); |
---|
516 | |
---|
517 | /* |
---|
518 | * Perform any thread migrations that are needed due to these changes. |
---|
519 | */ |
---|
520 | _Scheduler_priority_affinity_SMP_Check_for_migrations( context ); |
---|
521 | } |
---|
522 | |
---|
523 | bool _Scheduler_priority_affinity_SMP_Ask_for_help( |
---|
524 | const Scheduler_Control *scheduler, |
---|
525 | Thread_Control *the_thread, |
---|
526 | Scheduler_Node *node |
---|
527 | ) |
---|
528 | { |
---|
529 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
---|
530 | |
---|
531 | return _Scheduler_priority_affinity_SMP_Do_ask_for_help( context, the_thread, node ); |
---|
532 | } |
---|
533 | |
---|
534 | void _Scheduler_priority_affinity_SMP_Reconsider_help_request( |
---|
535 | const Scheduler_Control *scheduler, |
---|
536 | Thread_Control *the_thread, |
---|
537 | Scheduler_Node *node |
---|
538 | ) |
---|
539 | { |
---|
540 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
---|
541 | |
---|
542 | _Scheduler_SMP_Reconsider_help_request( |
---|
543 | context, |
---|
544 | the_thread, |
---|
545 | node, |
---|
546 | _Scheduler_priority_SMP_Extract_from_ready |
---|
547 | ); |
---|
548 | } |
---|
549 | |
---|
550 | void _Scheduler_priority_affinity_SMP_Withdraw_node( |
---|
551 | const Scheduler_Control *scheduler, |
---|
552 | Thread_Control *the_thread, |
---|
553 | Scheduler_Node *node, |
---|
554 | Thread_Scheduler_state next_state |
---|
555 | ) |
---|
556 | { |
---|
557 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
---|
558 | |
---|
559 | _Scheduler_SMP_Withdraw_node( |
---|
560 | context, |
---|
561 | the_thread, |
---|
562 | node, |
---|
563 | next_state, |
---|
564 | _Scheduler_priority_SMP_Extract_from_ready, |
---|
565 | _Scheduler_priority_affinity_SMP_Get_highest_ready, |
---|
566 | _Scheduler_priority_SMP_Move_from_ready_to_scheduled, |
---|
567 | _Scheduler_SMP_Allocate_processor_lazy |
---|
568 | ); |
---|
569 | } |
---|
570 | |
---|
571 | void _Scheduler_priority_affinity_SMP_Add_processor( |
---|
572 | const Scheduler_Control *scheduler, |
---|
573 | Thread_Control *idle |
---|
574 | ) |
---|
575 | { |
---|
576 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
---|
577 | |
---|
578 | _Scheduler_SMP_Add_processor( |
---|
579 | context, |
---|
580 | idle, |
---|
581 | _Scheduler_priority_SMP_Has_ready, |
---|
582 | _Scheduler_priority_affinity_SMP_Enqueue_scheduled_fifo, |
---|
583 | _Scheduler_SMP_Do_nothing_register_idle |
---|
584 | ); |
---|
585 | } |
---|
586 | |
---|
587 | Thread_Control *_Scheduler_priority_affinity_SMP_Remove_processor( |
---|
588 | const Scheduler_Control *scheduler, |
---|
589 | Per_CPU_Control *cpu |
---|
590 | ) |
---|
591 | { |
---|
592 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
---|
593 | |
---|
594 | return _Scheduler_SMP_Remove_processor( |
---|
595 | context, |
---|
596 | cpu, |
---|
597 | _Scheduler_priority_SMP_Extract_from_ready, |
---|
598 | _Scheduler_priority_affinity_SMP_Enqueue_fifo |
---|
599 | ); |
---|
600 | } |
---|
601 | |
---|
602 | bool _Scheduler_priority_affinity_SMP_Set_affinity( |
---|
603 | const Scheduler_Control *scheduler, |
---|
604 | Thread_Control *thread, |
---|
605 | Scheduler_Node *node_base, |
---|
606 | const Processor_mask *affinity |
---|
607 | ) |
---|
608 | { |
---|
609 | Scheduler_Context *context; |
---|
610 | Scheduler_priority_affinity_SMP_Node *node; |
---|
611 | States_Control current_state; |
---|
612 | Processor_mask my_affinity; |
---|
613 | cpu_set_t cpuset; |
---|
614 | |
---|
615 | context = _Scheduler_Get_context( scheduler ); |
---|
616 | _Processor_mask_And( &my_affinity, &context->Processors, affinity ); |
---|
617 | |
---|
618 | if ( _Processor_mask_Count( &my_affinity ) == 0 ) { |
---|
619 | return false; |
---|
620 | } |
---|
621 | |
---|
622 | _Processor_mask_To_cpu_set_t( &my_affinity, sizeof( cpuset ), &cpuset ); |
---|
623 | node = _Scheduler_priority_affinity_SMP_Node_downcast( node_base ); |
---|
624 | |
---|
625 | /* |
---|
626 | * The old and new set are the same, there is no point in |
---|
627 | * doing anything. |
---|
628 | */ |
---|
629 | if ( CPU_EQUAL( &cpuset, &node->affinity ) ) |
---|
630 | return true; |
---|
631 | |
---|
632 | current_state = thread->current_state; |
---|
633 | |
---|
634 | if ( _States_Is_ready( current_state ) ) { |
---|
635 | _Scheduler_priority_affinity_SMP_Block( scheduler, thread, &node->Base.Base.Base ); |
---|
636 | } |
---|
637 | |
---|
638 | CPU_COPY( &cpuset, &node->affinity ); |
---|
639 | |
---|
640 | if ( _States_Is_ready( current_state ) ) { |
---|
641 | /* |
---|
642 | * FIXME: Do not ignore threads in need for help. |
---|
643 | */ |
---|
644 | (void) _Scheduler_priority_affinity_SMP_Unblock( scheduler, thread, &node->Base.Base.Base ); |
---|
645 | } |
---|
646 | |
---|
647 | return true; |
---|
648 | } |
---|