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1 | /* |
1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** |
- | |
30 | * @defgroup proc Proc |
- | |
31 | * @ingroup kernel |
- | |
32 | * @{ |
- | |
33 | * @} |
- | |
34 | */ |
- | |
35 | 29 | ||
36 | /** @addtogroup genericproc generic |
30 | /** @addtogroup genericproc |
37 | * @ingroup proc |
- | |
38 | * @{ |
31 | * @{ |
39 | */ |
32 | */ |
40 | 33 | ||
41 | /** |
34 | /** |
42 | * @file |
35 | * @file |
43 | * @brief Scheduler and load balancing. |
36 | * @brief Scheduler and load balancing. |
44 | * |
37 | * |
45 | * This file contains the scheduler and kcpulb kernel thread which |
38 | * This file contains the scheduler and kcpulb kernel thread which |
46 | * performs load-balancing of per-CPU run queues. |
39 | * performs load-balancing of per-CPU run queues. |
47 | */ |
40 | */ |
48 | 41 | ||
49 | #include <proc/scheduler.h> |
42 | #include <proc/scheduler.h> |
50 | #include <proc/thread.h> |
43 | #include <proc/thread.h> |
51 | #include <proc/task.h> |
44 | #include <proc/task.h> |
52 | #include <mm/frame.h> |
45 | #include <mm/frame.h> |
53 | #include <mm/page.h> |
46 | #include <mm/page.h> |
54 | #include <mm/as.h> |
47 | #include <mm/as.h> |
55 | #include <time/delay.h> |
48 | #include <time/delay.h> |
56 | #include <arch/asm.h> |
49 | #include <arch/asm.h> |
57 | #include <arch/faddr.h> |
50 | #include <arch/faddr.h> |
58 | #include <atomic.h> |
51 | #include <atomic.h> |
59 | #include <synch/spinlock.h> |
52 | #include <synch/spinlock.h> |
60 | #include <config.h> |
53 | #include <config.h> |
61 | #include <context.h> |
54 | #include <context.h> |
62 | #include <func.h> |
55 | #include <func.h> |
63 | #include <arch.h> |
56 | #include <arch.h> |
64 | #include <adt/list.h> |
57 | #include <adt/list.h> |
65 | #include <panic.h> |
58 | #include <panic.h> |
66 | #include <typedefs.h> |
59 | #include <typedefs.h> |
67 | #include <cpu.h> |
60 | #include <cpu.h> |
68 | #include <print.h> |
61 | #include <print.h> |
69 | #include <debug.h> |
62 | #include <debug.h> |
70 | 63 | ||
71 | static void before_task_runs(void); |
64 | static void before_task_runs(void); |
72 | static void before_thread_runs(void); |
65 | static void before_thread_runs(void); |
73 | static void after_thread_ran(void); |
66 | static void after_thread_ran(void); |
74 | static void scheduler_separated_stack(void); |
67 | static void scheduler_separated_stack(void); |
75 | 68 | ||
76 | atomic_t nrdy; /**< Number of ready threads in the system. */ |
69 | atomic_t nrdy; /**< Number of ready threads in the system. */ |
77 | 70 | ||
78 | /** Carry out actions before new task runs. */ |
71 | /** Carry out actions before new task runs. */ |
79 | void before_task_runs(void) |
72 | void before_task_runs(void) |
80 | { |
73 | { |
81 | before_task_runs_arch(); |
74 | before_task_runs_arch(); |
82 | } |
75 | } |
83 | 76 | ||
84 | /** Take actions before new thread runs. |
77 | /** Take actions before new thread runs. |
85 | * |
78 | * |
86 | * Perform actions that need to be |
79 | * Perform actions that need to be |
87 | * taken before the newly selected |
80 | * taken before the newly selected |
88 | * tread is passed control. |
81 | * tread is passed control. |
89 | * |
82 | * |
90 | * THREAD->lock is locked on entry |
83 | * THREAD->lock is locked on entry |
91 | * |
84 | * |
92 | */ |
85 | */ |
93 | void before_thread_runs(void) |
86 | void before_thread_runs(void) |
94 | { |
87 | { |
95 | before_thread_runs_arch(); |
88 | before_thread_runs_arch(); |
96 | #ifdef CONFIG_FPU_LAZY |
89 | #ifdef CONFIG_FPU_LAZY |
97 | if(THREAD==CPU->fpu_owner) |
90 | if(THREAD==CPU->fpu_owner) |
98 | fpu_enable(); |
91 | fpu_enable(); |
99 | else |
92 | else |
100 | fpu_disable(); |
93 | fpu_disable(); |
101 | #else |
94 | #else |
102 | fpu_enable(); |
95 | fpu_enable(); |
103 | if (THREAD->fpu_context_exists) |
96 | if (THREAD->fpu_context_exists) |
104 | fpu_context_restore(THREAD->saved_fpu_context); |
97 | fpu_context_restore(THREAD->saved_fpu_context); |
105 | else { |
98 | else { |
106 | fpu_init(); |
99 | fpu_init(); |
107 | THREAD->fpu_context_exists=1; |
100 | THREAD->fpu_context_exists=1; |
108 | } |
101 | } |
109 | #endif |
102 | #endif |
110 | } |
103 | } |
111 | 104 | ||
112 | /** Take actions after THREAD had run. |
105 | /** Take actions after THREAD had run. |
113 | * |
106 | * |
114 | * Perform actions that need to be |
107 | * Perform actions that need to be |
115 | * taken after the running thread |
108 | * taken after the running thread |
116 | * had been preempted by the scheduler. |
109 | * had been preempted by the scheduler. |
117 | * |
110 | * |
118 | * THREAD->lock is locked on entry |
111 | * THREAD->lock is locked on entry |
119 | * |
112 | * |
120 | */ |
113 | */ |
121 | void after_thread_ran(void) |
114 | void after_thread_ran(void) |
122 | { |
115 | { |
123 | after_thread_ran_arch(); |
116 | after_thread_ran_arch(); |
124 | } |
117 | } |
125 | 118 | ||
126 | #ifdef CONFIG_FPU_LAZY |
119 | #ifdef CONFIG_FPU_LAZY |
127 | void scheduler_fpu_lazy_request(void) |
120 | void scheduler_fpu_lazy_request(void) |
128 | { |
121 | { |
129 | restart: |
122 | restart: |
130 | fpu_enable(); |
123 | fpu_enable(); |
131 | spinlock_lock(&CPU->lock); |
124 | spinlock_lock(&CPU->lock); |
132 | 125 | ||
133 | /* Save old context */ |
126 | /* Save old context */ |
134 | if (CPU->fpu_owner != NULL) { |
127 | if (CPU->fpu_owner != NULL) { |
135 | spinlock_lock(&CPU->fpu_owner->lock); |
128 | spinlock_lock(&CPU->fpu_owner->lock); |
136 | fpu_context_save(CPU->fpu_owner->saved_fpu_context); |
129 | fpu_context_save(CPU->fpu_owner->saved_fpu_context); |
137 | /* don't prevent migration */ |
130 | /* don't prevent migration */ |
138 | CPU->fpu_owner->fpu_context_engaged=0; |
131 | CPU->fpu_owner->fpu_context_engaged=0; |
139 | spinlock_unlock(&CPU->fpu_owner->lock); |
132 | spinlock_unlock(&CPU->fpu_owner->lock); |
140 | CPU->fpu_owner = NULL; |
133 | CPU->fpu_owner = NULL; |
141 | } |
134 | } |
142 | 135 | ||
143 | spinlock_lock(&THREAD->lock); |
136 | spinlock_lock(&THREAD->lock); |
144 | if (THREAD->fpu_context_exists) { |
137 | if (THREAD->fpu_context_exists) { |
145 | fpu_context_restore(THREAD->saved_fpu_context); |
138 | fpu_context_restore(THREAD->saved_fpu_context); |
146 | } else { |
139 | } else { |
147 | /* Allocate FPU context */ |
140 | /* Allocate FPU context */ |
148 | if (!THREAD->saved_fpu_context) { |
141 | if (!THREAD->saved_fpu_context) { |
149 | /* Might sleep */ |
142 | /* Might sleep */ |
150 | spinlock_unlock(&THREAD->lock); |
143 | spinlock_unlock(&THREAD->lock); |
151 | spinlock_unlock(&CPU->lock); |
144 | spinlock_unlock(&CPU->lock); |
152 | THREAD->saved_fpu_context = slab_alloc(fpu_context_slab, |
145 | THREAD->saved_fpu_context = slab_alloc(fpu_context_slab, |
153 | 0); |
146 | 0); |
154 | /* We may have switched CPUs during slab_alloc */ |
147 | /* We may have switched CPUs during slab_alloc */ |
155 | goto restart; |
148 | goto restart; |
156 | } |
149 | } |
157 | fpu_init(); |
150 | fpu_init(); |
158 | THREAD->fpu_context_exists=1; |
151 | THREAD->fpu_context_exists=1; |
159 | } |
152 | } |
160 | CPU->fpu_owner=THREAD; |
153 | CPU->fpu_owner=THREAD; |
161 | THREAD->fpu_context_engaged = 1; |
154 | THREAD->fpu_context_engaged = 1; |
162 | spinlock_unlock(&THREAD->lock); |
155 | spinlock_unlock(&THREAD->lock); |
163 | 156 | ||
164 | spinlock_unlock(&CPU->lock); |
157 | spinlock_unlock(&CPU->lock); |
165 | } |
158 | } |
166 | #endif |
159 | #endif |
167 | 160 | ||
168 | /** Initialize scheduler |
161 | /** Initialize scheduler |
169 | * |
162 | * |
170 | * Initialize kernel scheduler. |
163 | * Initialize kernel scheduler. |
171 | * |
164 | * |
172 | */ |
165 | */ |
173 | void scheduler_init(void) |
166 | void scheduler_init(void) |
174 | { |
167 | { |
175 | } |
168 | } |
176 | 169 | ||
177 | /** Get thread to be scheduled |
170 | /** Get thread to be scheduled |
178 | * |
171 | * |
179 | * Get the optimal thread to be scheduled |
172 | * Get the optimal thread to be scheduled |
180 | * according to thread accounting and scheduler |
173 | * according to thread accounting and scheduler |
181 | * policy. |
174 | * policy. |
182 | * |
175 | * |
183 | * @return Thread to be scheduled. |
176 | * @return Thread to be scheduled. |
184 | * |
177 | * |
185 | */ |
178 | */ |
186 | static thread_t *find_best_thread(void) |
179 | static thread_t *find_best_thread(void) |
187 | { |
180 | { |
188 | thread_t *t; |
181 | thread_t *t; |
189 | runq_t *r; |
182 | runq_t *r; |
190 | int i; |
183 | int i; |
191 | 184 | ||
192 | ASSERT(CPU != NULL); |
185 | ASSERT(CPU != NULL); |
193 | 186 | ||
194 | loop: |
187 | loop: |
195 | interrupts_enable(); |
188 | interrupts_enable(); |
196 | 189 | ||
197 | if (atomic_get(&CPU->nrdy) == 0) { |
190 | if (atomic_get(&CPU->nrdy) == 0) { |
198 | /* |
191 | /* |
199 | * For there was nothing to run, the CPU goes to sleep |
192 | * For there was nothing to run, the CPU goes to sleep |
200 | * until a hardware interrupt or an IPI comes. |
193 | * until a hardware interrupt or an IPI comes. |
201 | * This improves energy saving and hyperthreading. |
194 | * This improves energy saving and hyperthreading. |
202 | */ |
195 | */ |
203 | 196 | ||
204 | /* |
197 | /* |
205 | * An interrupt might occur right now and wake up a thread. |
198 | * An interrupt might occur right now and wake up a thread. |
206 | * In such case, the CPU will continue to go to sleep |
199 | * In such case, the CPU will continue to go to sleep |
207 | * even though there is a runnable thread. |
200 | * even though there is a runnable thread. |
208 | */ |
201 | */ |
209 | 202 | ||
210 | cpu_sleep(); |
203 | cpu_sleep(); |
211 | goto loop; |
204 | goto loop; |
212 | } |
205 | } |
213 | 206 | ||
214 | interrupts_disable(); |
207 | interrupts_disable(); |
215 | 208 | ||
216 | for (i = 0; i<RQ_COUNT; i++) { |
209 | for (i = 0; i<RQ_COUNT; i++) { |
217 | r = &CPU->rq[i]; |
210 | r = &CPU->rq[i]; |
218 | spinlock_lock(&r->lock); |
211 | spinlock_lock(&r->lock); |
219 | if (r->n == 0) { |
212 | if (r->n == 0) { |
220 | /* |
213 | /* |
221 | * If this queue is empty, try a lower-priority queue. |
214 | * If this queue is empty, try a lower-priority queue. |
222 | */ |
215 | */ |
223 | spinlock_unlock(&r->lock); |
216 | spinlock_unlock(&r->lock); |
224 | continue; |
217 | continue; |
225 | } |
218 | } |
226 | 219 | ||
227 | atomic_dec(&CPU->nrdy); |
220 | atomic_dec(&CPU->nrdy); |
228 | atomic_dec(&nrdy); |
221 | atomic_dec(&nrdy); |
229 | r->n--; |
222 | r->n--; |
230 | 223 | ||
231 | /* |
224 | /* |
232 | * Take the first thread from the queue. |
225 | * Take the first thread from the queue. |
233 | */ |
226 | */ |
234 | t = list_get_instance(r->rq_head.next, thread_t, rq_link); |
227 | t = list_get_instance(r->rq_head.next, thread_t, rq_link); |
235 | list_remove(&t->rq_link); |
228 | list_remove(&t->rq_link); |
236 | 229 | ||
237 | spinlock_unlock(&r->lock); |
230 | spinlock_unlock(&r->lock); |
238 | 231 | ||
239 | spinlock_lock(&t->lock); |
232 | spinlock_lock(&t->lock); |
240 | t->cpu = CPU; |
233 | t->cpu = CPU; |
241 | 234 | ||
242 | t->ticks = us2ticks((i+1)*10000); |
235 | t->ticks = us2ticks((i+1)*10000); |
243 | t->priority = i; /* correct rq index */ |
236 | t->priority = i; /* correct rq index */ |
244 | 237 | ||
245 | /* |
238 | /* |
246 | * Clear the X_STOLEN flag so that t can be migrated when load balancing needs emerge. |
239 | * Clear the X_STOLEN flag so that t can be migrated when load balancing needs emerge. |
247 | */ |
240 | */ |
248 | t->flags &= ~X_STOLEN; |
241 | t->flags &= ~X_STOLEN; |
249 | spinlock_unlock(&t->lock); |
242 | spinlock_unlock(&t->lock); |
250 | 243 | ||
251 | return t; |
244 | return t; |
252 | } |
245 | } |
253 | goto loop; |
246 | goto loop; |
254 | 247 | ||
255 | } |
248 | } |
256 | 249 | ||
257 | /** Prevent rq starvation |
250 | /** Prevent rq starvation |
258 | * |
251 | * |
259 | * Prevent low priority threads from starving in rq's. |
252 | * Prevent low priority threads from starving in rq's. |
260 | * |
253 | * |
261 | * When the function decides to relink rq's, it reconnects |
254 | * When the function decides to relink rq's, it reconnects |
262 | * respective pointers so that in result threads with 'pri' |
255 | * respective pointers so that in result threads with 'pri' |
263 | * greater or equal @start are moved to a higher-priority queue. |
256 | * greater or equal @start are moved to a higher-priority queue. |
264 | * |
257 | * |
265 | * @param start Threshold priority. |
258 | * @param start Threshold priority. |
266 | * |
259 | * |
267 | */ |
260 | */ |
268 | static void relink_rq(int start) |
261 | static void relink_rq(int start) |
269 | { |
262 | { |
270 | link_t head; |
263 | link_t head; |
271 | runq_t *r; |
264 | runq_t *r; |
272 | int i, n; |
265 | int i, n; |
273 | 266 | ||
274 | list_initialize(&head); |
267 | list_initialize(&head); |
275 | spinlock_lock(&CPU->lock); |
268 | spinlock_lock(&CPU->lock); |
276 | if (CPU->needs_relink > NEEDS_RELINK_MAX) { |
269 | if (CPU->needs_relink > NEEDS_RELINK_MAX) { |
277 | for (i = start; i<RQ_COUNT-1; i++) { |
270 | for (i = start; i<RQ_COUNT-1; i++) { |
278 | /* remember and empty rq[i + 1] */ |
271 | /* remember and empty rq[i + 1] */ |
279 | r = &CPU->rq[i + 1]; |
272 | r = &CPU->rq[i + 1]; |
280 | spinlock_lock(&r->lock); |
273 | spinlock_lock(&r->lock); |
281 | list_concat(&head, &r->rq_head); |
274 | list_concat(&head, &r->rq_head); |
282 | n = r->n; |
275 | n = r->n; |
283 | r->n = 0; |
276 | r->n = 0; |
284 | spinlock_unlock(&r->lock); |
277 | spinlock_unlock(&r->lock); |
285 | 278 | ||
286 | /* append rq[i + 1] to rq[i] */ |
279 | /* append rq[i + 1] to rq[i] */ |
287 | r = &CPU->rq[i]; |
280 | r = &CPU->rq[i]; |
288 | spinlock_lock(&r->lock); |
281 | spinlock_lock(&r->lock); |
289 | list_concat(&r->rq_head, &head); |
282 | list_concat(&r->rq_head, &head); |
290 | r->n += n; |
283 | r->n += n; |
291 | spinlock_unlock(&r->lock); |
284 | spinlock_unlock(&r->lock); |
292 | } |
285 | } |
293 | CPU->needs_relink = 0; |
286 | CPU->needs_relink = 0; |
294 | } |
287 | } |
295 | spinlock_unlock(&CPU->lock); |
288 | spinlock_unlock(&CPU->lock); |
296 | 289 | ||
297 | } |
290 | } |
298 | 291 | ||
299 | /** The scheduler |
292 | /** The scheduler |
300 | * |
293 | * |
301 | * The thread scheduling procedure. |
294 | * The thread scheduling procedure. |
302 | * Passes control directly to |
295 | * Passes control directly to |
303 | * scheduler_separated_stack(). |
296 | * scheduler_separated_stack(). |
304 | * |
297 | * |
305 | */ |
298 | */ |
306 | void scheduler(void) |
299 | void scheduler(void) |
307 | { |
300 | { |
308 | volatile ipl_t ipl; |
301 | volatile ipl_t ipl; |
309 | 302 | ||
310 | ASSERT(CPU != NULL); |
303 | ASSERT(CPU != NULL); |
311 | 304 | ||
312 | ipl = interrupts_disable(); |
305 | ipl = interrupts_disable(); |
313 | 306 | ||
314 | if (atomic_get(&haltstate)) |
307 | if (atomic_get(&haltstate)) |
315 | halt(); |
308 | halt(); |
316 | 309 | ||
317 | if (THREAD) { |
310 | if (THREAD) { |
318 | spinlock_lock(&THREAD->lock); |
311 | spinlock_lock(&THREAD->lock); |
319 | #ifndef CONFIG_FPU_LAZY |
312 | #ifndef CONFIG_FPU_LAZY |
320 | fpu_context_save(THREAD->saved_fpu_context); |
313 | fpu_context_save(THREAD->saved_fpu_context); |
321 | #endif |
314 | #endif |
322 | if (!context_save(&THREAD->saved_context)) { |
315 | if (!context_save(&THREAD->saved_context)) { |
323 | /* |
316 | /* |
324 | * This is the place where threads leave scheduler(); |
317 | * This is the place where threads leave scheduler(); |
325 | */ |
318 | */ |
326 | spinlock_unlock(&THREAD->lock); |
319 | spinlock_unlock(&THREAD->lock); |
327 | interrupts_restore(THREAD->saved_context.ipl); |
320 | interrupts_restore(THREAD->saved_context.ipl); |
328 | 321 | ||
329 | return; |
322 | return; |
330 | } |
323 | } |
331 | 324 | ||
332 | /* |
325 | /* |
333 | * Interrupt priority level of preempted thread is recorded here |
326 | * Interrupt priority level of preempted thread is recorded here |
334 | * to facilitate scheduler() invocations from interrupts_disable()'d |
327 | * to facilitate scheduler() invocations from interrupts_disable()'d |
335 | * code (e.g. waitq_sleep_timeout()). |
328 | * code (e.g. waitq_sleep_timeout()). |
336 | */ |
329 | */ |
337 | THREAD->saved_context.ipl = ipl; |
330 | THREAD->saved_context.ipl = ipl; |
338 | } |
331 | } |
339 | 332 | ||
340 | /* |
333 | /* |
341 | * Through the 'THE' structure, we keep track of THREAD, TASK, CPU, VM |
334 | * Through the 'THE' structure, we keep track of THREAD, TASK, CPU, VM |
342 | * and preemption counter. At this point THE could be coming either |
335 | * and preemption counter. At this point THE could be coming either |
343 | * from THREAD's or CPU's stack. |
336 | * from THREAD's or CPU's stack. |
344 | */ |
337 | */ |
345 | the_copy(THE, (the_t *) CPU->stack); |
338 | the_copy(THE, (the_t *) CPU->stack); |
346 | 339 | ||
347 | /* |
340 | /* |
348 | * We may not keep the old stack. |
341 | * We may not keep the old stack. |
349 | * Reason: If we kept the old stack and got blocked, for instance, in |
342 | * Reason: If we kept the old stack and got blocked, for instance, in |
350 | * find_best_thread(), the old thread could get rescheduled by another |
343 | * find_best_thread(), the old thread could get rescheduled by another |
351 | * CPU and overwrite the part of its own stack that was also used by |
344 | * CPU and overwrite the part of its own stack that was also used by |
352 | * the scheduler on this CPU. |
345 | * the scheduler on this CPU. |
353 | * |
346 | * |
354 | * Moreover, we have to bypass the compiler-generated POP sequence |
347 | * Moreover, we have to bypass the compiler-generated POP sequence |
355 | * which is fooled by SP being set to the very top of the stack. |
348 | * which is fooled by SP being set to the very top of the stack. |
356 | * Therefore the scheduler() function continues in |
349 | * Therefore the scheduler() function continues in |
357 | * scheduler_separated_stack(). |
350 | * scheduler_separated_stack(). |
358 | */ |
351 | */ |
359 | context_save(&CPU->saved_context); |
352 | context_save(&CPU->saved_context); |
360 | context_set(&CPU->saved_context, FADDR(scheduler_separated_stack), (__address) CPU->stack, CPU_STACK_SIZE); |
353 | context_set(&CPU->saved_context, FADDR(scheduler_separated_stack), (__address) CPU->stack, CPU_STACK_SIZE); |
361 | context_restore(&CPU->saved_context); |
354 | context_restore(&CPU->saved_context); |
362 | /* not reached */ |
355 | /* not reached */ |
363 | } |
356 | } |
364 | 357 | ||
365 | /** Scheduler stack switch wrapper |
358 | /** Scheduler stack switch wrapper |
366 | * |
359 | * |
367 | * Second part of the scheduler() function |
360 | * Second part of the scheduler() function |
368 | * using new stack. Handling the actual context |
361 | * using new stack. Handling the actual context |
369 | * switch to a new thread. |
362 | * switch to a new thread. |
370 | * |
363 | * |
371 | * Assume THREAD->lock is held. |
364 | * Assume THREAD->lock is held. |
372 | */ |
365 | */ |
373 | void scheduler_separated_stack(void) |
366 | void scheduler_separated_stack(void) |
374 | { |
367 | { |
375 | int priority; |
368 | int priority; |
376 | 369 | ||
377 | ASSERT(CPU != NULL); |
370 | ASSERT(CPU != NULL); |
378 | 371 | ||
379 | if (THREAD) { |
372 | if (THREAD) { |
380 | /* must be run after the switch to scheduler stack */ |
373 | /* must be run after the switch to scheduler stack */ |
381 | after_thread_ran(); |
374 | after_thread_ran(); |
382 | 375 | ||
383 | switch (THREAD->state) { |
376 | switch (THREAD->state) { |
384 | case Running: |
377 | case Running: |
385 | spinlock_unlock(&THREAD->lock); |
378 | spinlock_unlock(&THREAD->lock); |
386 | thread_ready(THREAD); |
379 | thread_ready(THREAD); |
387 | break; |
380 | break; |
388 | 381 | ||
389 | case Exiting: |
382 | case Exiting: |
390 | repeat: |
383 | repeat: |
391 | if (THREAD->detached) { |
384 | if (THREAD->detached) { |
392 | thread_destroy(THREAD); |
385 | thread_destroy(THREAD); |
393 | } else { |
386 | } else { |
394 | /* |
387 | /* |
395 | * The thread structure is kept allocated until somebody |
388 | * The thread structure is kept allocated until somebody |
396 | * calls thread_detach() on it. |
389 | * calls thread_detach() on it. |
397 | */ |
390 | */ |
398 | if (!spinlock_trylock(&THREAD->join_wq.lock)) { |
391 | if (!spinlock_trylock(&THREAD->join_wq.lock)) { |
399 | /* |
392 | /* |
400 | * Avoid deadlock. |
393 | * Avoid deadlock. |
401 | */ |
394 | */ |
402 | spinlock_unlock(&THREAD->lock); |
395 | spinlock_unlock(&THREAD->lock); |
403 | delay(10); |
396 | delay(10); |
404 | spinlock_lock(&THREAD->lock); |
397 | spinlock_lock(&THREAD->lock); |
405 | goto repeat; |
398 | goto repeat; |
406 | } |
399 | } |
407 | _waitq_wakeup_unsafe(&THREAD->join_wq, false); |
400 | _waitq_wakeup_unsafe(&THREAD->join_wq, false); |
408 | spinlock_unlock(&THREAD->join_wq.lock); |
401 | spinlock_unlock(&THREAD->join_wq.lock); |
409 | 402 | ||
410 | THREAD->state = Undead; |
403 | THREAD->state = Undead; |
411 | spinlock_unlock(&THREAD->lock); |
404 | spinlock_unlock(&THREAD->lock); |
412 | } |
405 | } |
413 | break; |
406 | break; |
414 | 407 | ||
415 | case Sleeping: |
408 | case Sleeping: |
416 | /* |
409 | /* |
417 | * Prefer the thread after it's woken up. |
410 | * Prefer the thread after it's woken up. |
418 | */ |
411 | */ |
419 | THREAD->priority = -1; |
412 | THREAD->priority = -1; |
420 | 413 | ||
421 | /* |
414 | /* |
422 | * We need to release wq->lock which we locked in waitq_sleep(). |
415 | * We need to release wq->lock which we locked in waitq_sleep(). |
423 | * Address of wq->lock is kept in THREAD->sleep_queue. |
416 | * Address of wq->lock is kept in THREAD->sleep_queue. |
424 | */ |
417 | */ |
425 | spinlock_unlock(&THREAD->sleep_queue->lock); |
418 | spinlock_unlock(&THREAD->sleep_queue->lock); |
426 | 419 | ||
427 | /* |
420 | /* |
428 | * Check for possible requests for out-of-context invocation. |
421 | * Check for possible requests for out-of-context invocation. |
429 | */ |
422 | */ |
430 | if (THREAD->call_me) { |
423 | if (THREAD->call_me) { |
431 | THREAD->call_me(THREAD->call_me_with); |
424 | THREAD->call_me(THREAD->call_me_with); |
432 | THREAD->call_me = NULL; |
425 | THREAD->call_me = NULL; |
433 | THREAD->call_me_with = NULL; |
426 | THREAD->call_me_with = NULL; |
434 | } |
427 | } |
435 | 428 | ||
436 | spinlock_unlock(&THREAD->lock); |
429 | spinlock_unlock(&THREAD->lock); |
437 | 430 | ||
438 | break; |
431 | break; |
439 | 432 | ||
440 | default: |
433 | default: |
441 | /* |
434 | /* |
442 | * Entering state is unexpected. |
435 | * Entering state is unexpected. |
443 | */ |
436 | */ |
444 | panic("tid%d: unexpected state %s\n", THREAD->tid, thread_states[THREAD->state]); |
437 | panic("tid%d: unexpected state %s\n", THREAD->tid, thread_states[THREAD->state]); |
445 | break; |
438 | break; |
446 | } |
439 | } |
447 | 440 | ||
448 | THREAD = NULL; |
441 | THREAD = NULL; |
449 | } |
442 | } |
450 | 443 | ||
451 | THREAD = find_best_thread(); |
444 | THREAD = find_best_thread(); |
452 | 445 | ||
453 | spinlock_lock(&THREAD->lock); |
446 | spinlock_lock(&THREAD->lock); |
454 | priority = THREAD->priority; |
447 | priority = THREAD->priority; |
455 | spinlock_unlock(&THREAD->lock); |
448 | spinlock_unlock(&THREAD->lock); |
456 | 449 | ||
457 | relink_rq(priority); |
450 | relink_rq(priority); |
458 | 451 | ||
459 | /* |
452 | /* |
460 | * If both the old and the new task are the same, lots of work is avoided. |
453 | * If both the old and the new task are the same, lots of work is avoided. |
461 | */ |
454 | */ |
462 | if (TASK != THREAD->task) { |
455 | if (TASK != THREAD->task) { |
463 | as_t *as1 = NULL; |
456 | as_t *as1 = NULL; |
464 | as_t *as2; |
457 | as_t *as2; |
465 | 458 | ||
466 | if (TASK) { |
459 | if (TASK) { |
467 | spinlock_lock(&TASK->lock); |
460 | spinlock_lock(&TASK->lock); |
468 | as1 = TASK->as; |
461 | as1 = TASK->as; |
469 | spinlock_unlock(&TASK->lock); |
462 | spinlock_unlock(&TASK->lock); |
470 | } |
463 | } |
471 | 464 | ||
472 | spinlock_lock(&THREAD->task->lock); |
465 | spinlock_lock(&THREAD->task->lock); |
473 | as2 = THREAD->task->as; |
466 | as2 = THREAD->task->as; |
474 | spinlock_unlock(&THREAD->task->lock); |
467 | spinlock_unlock(&THREAD->task->lock); |
475 | 468 | ||
476 | /* |
469 | /* |
477 | * Note that it is possible for two tasks to share one address space. |
470 | * Note that it is possible for two tasks to share one address space. |
478 | */ |
471 | */ |
479 | if (as1 != as2) { |
472 | if (as1 != as2) { |
480 | /* |
473 | /* |
481 | * Both tasks and address spaces are different. |
474 | * Both tasks and address spaces are different. |
482 | * Replace the old one with the new one. |
475 | * Replace the old one with the new one. |
483 | */ |
476 | */ |
484 | as_switch(as1, as2); |
477 | as_switch(as1, as2); |
485 | } |
478 | } |
486 | TASK = THREAD->task; |
479 | TASK = THREAD->task; |
487 | before_task_runs(); |
480 | before_task_runs(); |
488 | } |
481 | } |
489 | 482 | ||
490 | spinlock_lock(&THREAD->lock); |
483 | spinlock_lock(&THREAD->lock); |
491 | THREAD->state = Running; |
484 | THREAD->state = Running; |
492 | 485 | ||
493 | #ifdef SCHEDULER_VERBOSE |
486 | #ifdef SCHEDULER_VERBOSE |
494 | printf("cpu%d: tid %d (priority=%d,ticks=%lld,nrdy=%ld)\n", CPU->id, THREAD->tid, THREAD->priority, THREAD->ticks, atomic_get(&CPU->nrdy)); |
487 | printf("cpu%d: tid %d (priority=%d,ticks=%lld,nrdy=%ld)\n", CPU->id, THREAD->tid, THREAD->priority, THREAD->ticks, atomic_get(&CPU->nrdy)); |
495 | #endif |
488 | #endif |
496 | 489 | ||
497 | /* |
490 | /* |
498 | * Some architectures provide late kernel PA2KA(identity) |
491 | * Some architectures provide late kernel PA2KA(identity) |
499 | * mapping in a page fault handler. However, the page fault |
492 | * mapping in a page fault handler. However, the page fault |
500 | * handler uses the kernel stack of the running thread and |
493 | * handler uses the kernel stack of the running thread and |
501 | * therefore cannot be used to map it. The kernel stack, if |
494 | * therefore cannot be used to map it. The kernel stack, if |
502 | * necessary, is to be mapped in before_thread_runs(). This |
495 | * necessary, is to be mapped in before_thread_runs(). This |
503 | * function must be executed before the switch to the new stack. |
496 | * function must be executed before the switch to the new stack. |
504 | */ |
497 | */ |
505 | before_thread_runs(); |
498 | before_thread_runs(); |
506 | 499 | ||
507 | /* |
500 | /* |
508 | * Copy the knowledge of CPU, TASK, THREAD and preemption counter to thread's stack. |
501 | * Copy the knowledge of CPU, TASK, THREAD and preemption counter to thread's stack. |
509 | */ |
502 | */ |
510 | the_copy(THE, (the_t *) THREAD->kstack); |
503 | the_copy(THE, (the_t *) THREAD->kstack); |
511 | 504 | ||
512 | context_restore(&THREAD->saved_context); |
505 | context_restore(&THREAD->saved_context); |
513 | /* not reached */ |
506 | /* not reached */ |
514 | } |
507 | } |
515 | 508 | ||
516 | #ifdef CONFIG_SMP |
509 | #ifdef CONFIG_SMP |
517 | /** Load balancing thread |
510 | /** Load balancing thread |
518 | * |
511 | * |
519 | * SMP load balancing thread, supervising thread supplies |
512 | * SMP load balancing thread, supervising thread supplies |
520 | * for the CPU it's wired to. |
513 | * for the CPU it's wired to. |
521 | * |
514 | * |
522 | * @param arg Generic thread argument (unused). |
515 | * @param arg Generic thread argument (unused). |
523 | * |
516 | * |
524 | */ |
517 | */ |
525 | void kcpulb(void *arg) |
518 | void kcpulb(void *arg) |
526 | { |
519 | { |
527 | thread_t *t; |
520 | thread_t *t; |
528 | int count, average, i, j, k = 0; |
521 | int count, average, i, j, k = 0; |
529 | ipl_t ipl; |
522 | ipl_t ipl; |
530 | 523 | ||
531 | /* |
524 | /* |
532 | * Detach kcpulb as nobody will call thread_join_timeout() on it. |
525 | * Detach kcpulb as nobody will call thread_join_timeout() on it. |
533 | */ |
526 | */ |
534 | thread_detach(THREAD); |
527 | thread_detach(THREAD); |
535 | 528 | ||
536 | loop: |
529 | loop: |
537 | /* |
530 | /* |
538 | * Work in 1s intervals. |
531 | * Work in 1s intervals. |
539 | */ |
532 | */ |
540 | thread_sleep(1); |
533 | thread_sleep(1); |
541 | 534 | ||
542 | not_satisfied: |
535 | not_satisfied: |
543 | /* |
536 | /* |
544 | * Calculate the number of threads that will be migrated/stolen from |
537 | * Calculate the number of threads that will be migrated/stolen from |
545 | * other CPU's. Note that situation can have changed between two |
538 | * other CPU's. Note that situation can have changed between two |
546 | * passes. Each time get the most up to date counts. |
539 | * passes. Each time get the most up to date counts. |
547 | */ |
540 | */ |
548 | average = atomic_get(&nrdy) / config.cpu_active + 1; |
541 | average = atomic_get(&nrdy) / config.cpu_active + 1; |
549 | count = average - atomic_get(&CPU->nrdy); |
542 | count = average - atomic_get(&CPU->nrdy); |
550 | 543 | ||
551 | if (count <= 0) |
544 | if (count <= 0) |
552 | goto satisfied; |
545 | goto satisfied; |
553 | 546 | ||
554 | /* |
547 | /* |
555 | * Searching least priority queues on all CPU's first and most priority queues on all CPU's last. |
548 | * Searching least priority queues on all CPU's first and most priority queues on all CPU's last. |
556 | */ |
549 | */ |
557 | for (j=RQ_COUNT-1; j >= 0; j--) { |
550 | for (j=RQ_COUNT-1; j >= 0; j--) { |
558 | for (i=0; i < config.cpu_active; i++) { |
551 | for (i=0; i < config.cpu_active; i++) { |
559 | link_t *l; |
552 | link_t *l; |
560 | runq_t *r; |
553 | runq_t *r; |
561 | cpu_t *cpu; |
554 | cpu_t *cpu; |
562 | 555 | ||
563 | cpu = &cpus[(i + k) % config.cpu_active]; |
556 | cpu = &cpus[(i + k) % config.cpu_active]; |
564 | 557 | ||
565 | /* |
558 | /* |
566 | * Not interested in ourselves. |
559 | * Not interested in ourselves. |
567 | * Doesn't require interrupt disabling for kcpulb is X_WIRED. |
560 | * Doesn't require interrupt disabling for kcpulb is X_WIRED. |
568 | */ |
561 | */ |
569 | if (CPU == cpu) |
562 | if (CPU == cpu) |
570 | continue; |
563 | continue; |
571 | if (atomic_get(&cpu->nrdy) <= average) |
564 | if (atomic_get(&cpu->nrdy) <= average) |
572 | continue; |
565 | continue; |
573 | 566 | ||
574 | ipl = interrupts_disable(); |
567 | ipl = interrupts_disable(); |
575 | r = &cpu->rq[j]; |
568 | r = &cpu->rq[j]; |
576 | spinlock_lock(&r->lock); |
569 | spinlock_lock(&r->lock); |
577 | if (r->n == 0) { |
570 | if (r->n == 0) { |
578 | spinlock_unlock(&r->lock); |
571 | spinlock_unlock(&r->lock); |
579 | interrupts_restore(ipl); |
572 | interrupts_restore(ipl); |
580 | continue; |
573 | continue; |
581 | } |
574 | } |
582 | 575 | ||
583 | t = NULL; |
576 | t = NULL; |
584 | l = r->rq_head.prev; /* search rq from the back */ |
577 | l = r->rq_head.prev; /* search rq from the back */ |
585 | while (l != &r->rq_head) { |
578 | while (l != &r->rq_head) { |
586 | t = list_get_instance(l, thread_t, rq_link); |
579 | t = list_get_instance(l, thread_t, rq_link); |
587 | /* |
580 | /* |
588 | * We don't want to steal CPU-wired threads neither threads already stolen. |
581 | * We don't want to steal CPU-wired threads neither threads already stolen. |
589 | * The latter prevents threads from migrating between CPU's without ever being run. |
582 | * The latter prevents threads from migrating between CPU's without ever being run. |
590 | * We don't want to steal threads whose FPU context is still in CPU. |
583 | * We don't want to steal threads whose FPU context is still in CPU. |
591 | */ |
584 | */ |
592 | spinlock_lock(&t->lock); |
585 | spinlock_lock(&t->lock); |
593 | if ( (!(t->flags & (X_WIRED | X_STOLEN))) && (!(t->fpu_context_engaged)) ) { |
586 | if ( (!(t->flags & (X_WIRED | X_STOLEN))) && (!(t->fpu_context_engaged)) ) { |
594 | /* |
587 | /* |
595 | * Remove t from r. |
588 | * Remove t from r. |
596 | */ |
589 | */ |
597 | spinlock_unlock(&t->lock); |
590 | spinlock_unlock(&t->lock); |
598 | 591 | ||
599 | atomic_dec(&cpu->nrdy); |
592 | atomic_dec(&cpu->nrdy); |
600 | atomic_dec(&nrdy); |
593 | atomic_dec(&nrdy); |
601 | 594 | ||
602 | r->n--; |
595 | r->n--; |
603 | list_remove(&t->rq_link); |
596 | list_remove(&t->rq_link); |
604 | 597 | ||
605 | break; |
598 | break; |
606 | } |
599 | } |
607 | spinlock_unlock(&t->lock); |
600 | spinlock_unlock(&t->lock); |
608 | l = l->prev; |
601 | l = l->prev; |
609 | t = NULL; |
602 | t = NULL; |
610 | } |
603 | } |
611 | spinlock_unlock(&r->lock); |
604 | spinlock_unlock(&r->lock); |
612 | 605 | ||
613 | if (t) { |
606 | if (t) { |
614 | /* |
607 | /* |
615 | * Ready t on local CPU |
608 | * Ready t on local CPU |
616 | */ |
609 | */ |
617 | spinlock_lock(&t->lock); |
610 | spinlock_lock(&t->lock); |
618 | #ifdef KCPULB_VERBOSE |
611 | #ifdef KCPULB_VERBOSE |
619 | printf("kcpulb%d: TID %d -> cpu%d, nrdy=%ld, avg=%nd\n", CPU->id, t->tid, CPU->id, atomic_get(&CPU->nrdy), atomic_get(&nrdy) / config.cpu_active); |
612 | printf("kcpulb%d: TID %d -> cpu%d, nrdy=%ld, avg=%nd\n", CPU->id, t->tid, CPU->id, atomic_get(&CPU->nrdy), atomic_get(&nrdy) / config.cpu_active); |
620 | #endif |
613 | #endif |
621 | t->flags |= X_STOLEN; |
614 | t->flags |= X_STOLEN; |
622 | t->state = Entering; |
615 | t->state = Entering; |
623 | spinlock_unlock(&t->lock); |
616 | spinlock_unlock(&t->lock); |
624 | 617 | ||
625 | thread_ready(t); |
618 | thread_ready(t); |
626 | 619 | ||
627 | interrupts_restore(ipl); |
620 | interrupts_restore(ipl); |
628 | 621 | ||
629 | if (--count == 0) |
622 | if (--count == 0) |
630 | goto satisfied; |
623 | goto satisfied; |
631 | 624 | ||
632 | /* |
625 | /* |
633 | * We are not satisfied yet, focus on another CPU next time. |
626 | * We are not satisfied yet, focus on another CPU next time. |
634 | */ |
627 | */ |
635 | k++; |
628 | k++; |
636 | 629 | ||
637 | continue; |
630 | continue; |
638 | } |
631 | } |
639 | interrupts_restore(ipl); |
632 | interrupts_restore(ipl); |
640 | } |
633 | } |
641 | } |
634 | } |
642 | 635 | ||
643 | if (atomic_get(&CPU->nrdy)) { |
636 | if (atomic_get(&CPU->nrdy)) { |
644 | /* |
637 | /* |
645 | * Be a little bit light-weight and let migrated threads run. |
638 | * Be a little bit light-weight and let migrated threads run. |
646 | */ |
639 | */ |
647 | scheduler(); |
640 | scheduler(); |
648 | } else { |
641 | } else { |
649 | /* |
642 | /* |
650 | * We failed to migrate a single thread. |
643 | * We failed to migrate a single thread. |
651 | * Give up this turn. |
644 | * Give up this turn. |
652 | */ |
645 | */ |
653 | goto loop; |
646 | goto loop; |
654 | } |
647 | } |
655 | 648 | ||
656 | goto not_satisfied; |
649 | goto not_satisfied; |
657 | 650 | ||
658 | satisfied: |
651 | satisfied: |
659 | goto loop; |
652 | goto loop; |
660 | } |
653 | } |
661 | 654 | ||
662 | #endif /* CONFIG_SMP */ |
655 | #endif /* CONFIG_SMP */ |
663 | 656 | ||
664 | 657 | ||
665 | /** Print information about threads & scheduler queues */ |
658 | /** Print information about threads & scheduler queues */ |
666 | void sched_print_list(void) |
659 | void sched_print_list(void) |
667 | { |
660 | { |
668 | ipl_t ipl; |
661 | ipl_t ipl; |
669 | int cpu,i; |
662 | int cpu,i; |
670 | runq_t *r; |
663 | runq_t *r; |
671 | thread_t *t; |
664 | thread_t *t; |
672 | link_t *cur; |
665 | link_t *cur; |
673 | 666 | ||
674 | /* We are going to mess with scheduler structures, |
667 | /* We are going to mess with scheduler structures, |
675 | * let's not be interrupted */ |
668 | * let's not be interrupted */ |
676 | ipl = interrupts_disable(); |
669 | ipl = interrupts_disable(); |
677 | for (cpu=0;cpu < config.cpu_count; cpu++) { |
670 | for (cpu=0;cpu < config.cpu_count; cpu++) { |
678 | 671 | ||
679 | if (!cpus[cpu].active) |
672 | if (!cpus[cpu].active) |
680 | continue; |
673 | continue; |
681 | 674 | ||
682 | spinlock_lock(&cpus[cpu].lock); |
675 | spinlock_lock(&cpus[cpu].lock); |
683 | printf("cpu%d: address=%p, nrdy=%ld, needs_relink=%ld\n", |
676 | printf("cpu%d: address=%p, nrdy=%ld, needs_relink=%ld\n", |
684 | cpus[cpu].id, &cpus[cpu], atomic_get(&cpus[cpu].nrdy), cpus[cpu].needs_relink); |
677 | cpus[cpu].id, &cpus[cpu], atomic_get(&cpus[cpu].nrdy), cpus[cpu].needs_relink); |
685 | 678 | ||
686 | for (i=0; i<RQ_COUNT; i++) { |
679 | for (i=0; i<RQ_COUNT; i++) { |
687 | r = &cpus[cpu].rq[i]; |
680 | r = &cpus[cpu].rq[i]; |
688 | spinlock_lock(&r->lock); |
681 | spinlock_lock(&r->lock); |
689 | if (!r->n) { |
682 | if (!r->n) { |
690 | spinlock_unlock(&r->lock); |
683 | spinlock_unlock(&r->lock); |
691 | continue; |
684 | continue; |
692 | } |
685 | } |
693 | printf("\trq[%d]: ", i); |
686 | printf("\trq[%d]: ", i); |
694 | for (cur=r->rq_head.next; cur!=&r->rq_head; cur=cur->next) { |
687 | for (cur=r->rq_head.next; cur!=&r->rq_head; cur=cur->next) { |
695 | t = list_get_instance(cur, thread_t, rq_link); |
688 | t = list_get_instance(cur, thread_t, rq_link); |
696 | printf("%d(%s) ", t->tid, |
689 | printf("%d(%s) ", t->tid, |
697 | thread_states[t->state]); |
690 | thread_states[t->state]); |
698 | } |
691 | } |
699 | printf("\n"); |
692 | printf("\n"); |
700 | spinlock_unlock(&r->lock); |
693 | spinlock_unlock(&r->lock); |
701 | } |
694 | } |
702 | spinlock_unlock(&cpus[cpu].lock); |
695 | spinlock_unlock(&cpus[cpu].lock); |
703 | } |
696 | } |
704 | 697 | ||
705 | interrupts_restore(ipl); |
698 | interrupts_restore(ipl); |
706 | } |
699 | } |
707 | 700 | ||
708 | /** @} |
701 | /** @} |
709 | */ |
702 | */ |
710 | 703 | ||
711 | 704 |