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