sched_m2.c revision 1.10.2.2
1 1.10.2.2 matt /* $NetBSD: sched_m2.c,v 1.10.2.2 2007/11/06 23:32:09 matt Exp $ */ 2 1.10.2.2 matt 3 1.10.2.2 matt /* 4 1.10.2.2 matt * Copyright (c) 2007, Mindaugas Rasiukevicius 5 1.10.2.2 matt * 6 1.10.2.2 matt * Redistribution and use in source and binary forms, with or without 7 1.10.2.2 matt * modification, are permitted provided that the following conditions 8 1.10.2.2 matt * are met: 9 1.10.2.2 matt * 1. Redistributions of source code must retain the above copyright 10 1.10.2.2 matt * notice, this list of conditions and the following disclaimer. 11 1.10.2.2 matt * 2. Redistributions in binary form must reproduce the above copyright 12 1.10.2.2 matt * notice, this list of conditions and the following disclaimer in the 13 1.10.2.2 matt * documentation and/or other materials provided with the distribution. 14 1.10.2.2 matt * 15 1.10.2.2 matt * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 1.10.2.2 matt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 17 1.10.2.2 matt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18 1.10.2.2 matt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 19 1.10.2.2 matt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 1.10.2.2 matt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 1.10.2.2 matt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 1.10.2.2 matt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 1.10.2.2 matt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 1.10.2.2 matt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 1.10.2.2 matt * POSSIBILITY OF SUCH DAMAGE. 26 1.10.2.2 matt */ 27 1.10.2.2 matt 28 1.10.2.2 matt /* 29 1.10.2.2 matt * TODO: 30 1.10.2.2 matt * - Implementation of fair share queue; 31 1.10.2.2 matt * - Support for NUMA; 32 1.10.2.2 matt */ 33 1.10.2.2 matt 34 1.10.2.2 matt #include <sys/cdefs.h> 35 1.10.2.2 matt __KERNEL_RCSID(0, "$NetBSD: sched_m2.c,v 1.10.2.2 2007/11/06 23:32:09 matt Exp $"); 36 1.10.2.2 matt 37 1.10.2.2 matt #include <sys/param.h> 38 1.10.2.2 matt 39 1.10.2.2 matt #include <sys/bitops.h> 40 1.10.2.2 matt #include <sys/cpu.h> 41 1.10.2.2 matt #include <sys/callout.h> 42 1.10.2.2 matt #include <sys/errno.h> 43 1.10.2.2 matt #include <sys/kernel.h> 44 1.10.2.2 matt #include <sys/kmem.h> 45 1.10.2.2 matt #include <sys/lwp.h> 46 1.10.2.2 matt #include <sys/mutex.h> 47 1.10.2.2 matt #include <sys/pool.h> 48 1.10.2.2 matt #include <sys/proc.h> 49 1.10.2.2 matt #include <sys/resource.h> 50 1.10.2.2 matt #include <sys/resourcevar.h> 51 1.10.2.2 matt #include <sys/sched.h> 52 1.10.2.2 matt #include <sys/syscallargs.h> 53 1.10.2.2 matt #include <sys/sysctl.h> 54 1.10.2.2 matt #include <sys/types.h> 55 1.10.2.2 matt 56 1.10.2.2 matt /* 57 1.10.2.2 matt * Priority related defintions. 58 1.10.2.2 matt */ 59 1.10.2.2 matt #define PRI_TS_COUNT (NPRI_USER) 60 1.10.2.2 matt #define PRI_RT_COUNT (PRI_COUNT - PRI_TS_COUNT) 61 1.10.2.2 matt #define PRI_HTS_RANGE (PRI_TS_COUNT / 10) 62 1.10.2.2 matt 63 1.10.2.2 matt #define PRI_HIGHEST_TS (PRI_KERNEL - 1) 64 1.10.2.2 matt #define PRI_DEFAULT (NPRI_USER >> 1) 65 1.10.2.2 matt 66 1.10.2.2 matt const int schedppq = 1; 67 1.10.2.2 matt 68 1.10.2.2 matt /* 69 1.10.2.2 matt * Bits per map. 70 1.10.2.2 matt */ 71 1.10.2.2 matt #define BITMAP_BITS (32) 72 1.10.2.2 matt #define BITMAP_SHIFT (5) 73 1.10.2.2 matt #define BITMAP_MSB (0x80000000) 74 1.10.2.2 matt #define BITMAP_MASK (BITMAP_BITS - 1) 75 1.10.2.2 matt 76 1.10.2.2 matt /* 77 1.10.2.2 matt * Time-slices and priorities. 78 1.10.2.2 matt */ 79 1.10.2.2 matt static u_int min_ts; /* Minimal time-slice */ 80 1.10.2.2 matt static u_int max_ts; /* Maximal time-slice */ 81 1.10.2.2 matt static u_int rt_ts; /* Real-time time-slice */ 82 1.10.2.2 matt static u_int ts_map[PRI_COUNT]; /* Map of time-slices */ 83 1.10.2.2 matt static pri_t high_pri[PRI_COUNT]; /* Map for priority increase */ 84 1.10.2.2 matt 85 1.10.2.2 matt /* 86 1.10.2.2 matt * Migration and balancing. 87 1.10.2.2 matt */ 88 1.10.2.2 matt #ifdef MULTIPROCESSOR 89 1.10.2.2 matt static u_int cacheht_time; /* Cache hotness time */ 90 1.10.2.2 matt static u_int min_catch; /* Minimal LWP count for catching */ 91 1.10.2.2 matt 92 1.10.2.2 matt static u_int balance_period; /* Balance period */ 93 1.10.2.2 matt static struct callout balance_ch; /* Callout of balancer */ 94 1.10.2.2 matt 95 1.10.2.2 matt static struct cpu_info * volatile worker_ci; 96 1.10.2.2 matt 97 1.10.2.2 matt #define CACHE_HOT(sil) (sil->sl_lrtime && \ 98 1.10.2.2 matt (hardclock_ticks - sil->sl_lrtime < cacheht_time)) 99 1.10.2.2 matt 100 1.10.2.2 matt #endif 101 1.10.2.2 matt 102 1.10.2.2 matt /* 103 1.10.2.2 matt * Structures, runqueue. 104 1.10.2.2 matt */ 105 1.10.2.2 matt 106 1.10.2.2 matt typedef struct { 107 1.10.2.2 matt TAILQ_HEAD(, lwp) q_head; 108 1.10.2.2 matt } queue_t; 109 1.10.2.2 matt 110 1.10.2.2 matt typedef struct { 111 1.10.2.2 matt /* Lock and bitmap */ 112 1.10.2.2 matt kmutex_t r_rq_mutex; 113 1.10.2.2 matt uint32_t r_bitmap[PRI_COUNT >> BITMAP_SHIFT]; 114 1.10.2.2 matt /* Counters */ 115 1.10.2.2 matt u_int r_count; /* Count of the threads */ 116 1.10.2.2 matt pri_t r_highest_pri; /* Highest priority */ 117 1.10.2.2 matt u_int r_avgcount; /* Average count of threads */ 118 1.10.2.2 matt u_int r_mcount; /* Count of migratable threads */ 119 1.10.2.2 matt /* Runqueues */ 120 1.10.2.2 matt queue_t r_rt_queue[PRI_RT_COUNT]; 121 1.10.2.2 matt queue_t r_ts_queue[PRI_TS_COUNT]; 122 1.10.2.2 matt } runqueue_t; 123 1.10.2.2 matt 124 1.10.2.2 matt typedef struct { 125 1.10.2.2 matt u_int sl_flags; 126 1.10.2.2 matt u_int sl_timeslice; /* Time-slice of thread */ 127 1.10.2.2 matt u_int sl_slept; /* Saved sleep time for sleep sum */ 128 1.10.2.2 matt u_int sl_slpsum; /* Sum of sleep time */ 129 1.10.2.2 matt u_int sl_rtime; /* Saved start time of run */ 130 1.10.2.2 matt u_int sl_rtsum; /* Sum of the run time */ 131 1.10.2.2 matt u_int sl_lrtime; /* Last run time */ 132 1.10.2.2 matt } sched_info_lwp_t; 133 1.10.2.2 matt 134 1.10.2.2 matt /* Flags */ 135 1.10.2.2 matt #define SL_BATCH 0x01 136 1.10.2.2 matt 137 1.10.2.2 matt /* Pool of the scheduler-specific structures for threads */ 138 1.10.2.2 matt static struct pool sil_pool; 139 1.10.2.2 matt 140 1.10.2.2 matt /* 141 1.10.2.2 matt * Prototypes. 142 1.10.2.2 matt */ 143 1.10.2.2 matt 144 1.10.2.2 matt static inline void * sched_getrq(runqueue_t *, const pri_t); 145 1.10.2.2 matt static inline void sched_newts(struct lwp *); 146 1.10.2.2 matt static void sched_precalcts(void); 147 1.10.2.2 matt 148 1.10.2.2 matt #ifdef MULTIPROCESSOR 149 1.10.2.2 matt static struct lwp * sched_catchlwp(void); 150 1.10.2.2 matt static void sched_balance(void *); 151 1.10.2.2 matt #endif 152 1.10.2.2 matt 153 1.10.2.2 matt /* 154 1.10.2.2 matt * Initialization and setup. 155 1.10.2.2 matt */ 156 1.10.2.2 matt 157 1.10.2.2 matt void 158 1.10.2.2 matt sched_rqinit(void) 159 1.10.2.2 matt { 160 1.10.2.2 matt struct cpu_info *ci = curcpu(); 161 1.10.2.2 matt 162 1.10.2.2 matt if (hz < 100) { 163 1.10.2.2 matt panic("sched_rqinit: value of HZ is too low\n"); 164 1.10.2.2 matt } 165 1.10.2.2 matt 166 1.10.2.2 matt /* Default timing ranges */ 167 1.10.2.2 matt min_ts = mstohz(50); /* ~50ms */ 168 1.10.2.2 matt max_ts = mstohz(150); /* ~150ms */ 169 1.10.2.2 matt rt_ts = mstohz(100); /* ~100ms */ 170 1.10.2.2 matt sched_precalcts(); 171 1.10.2.2 matt 172 1.10.2.2 matt #ifdef MULTIPROCESSOR 173 1.10.2.2 matt /* Balancing */ 174 1.10.2.2 matt worker_ci = ci; 175 1.10.2.2 matt cacheht_time = mstohz(5); /* ~5 ms */ 176 1.10.2.2 matt balance_period = mstohz(300); /* ~300ms */ 177 1.10.2.2 matt min_catch = ~0; 178 1.10.2.2 matt #endif 179 1.10.2.2 matt 180 1.10.2.2 matt /* Pool of the scheduler-specific structures */ 181 1.10.2.2 matt pool_init(&sil_pool, sizeof(sched_info_lwp_t), 0, 0, 0, 182 1.10.2.2 matt "lwpsd", &pool_allocator_nointr, IPL_NONE); 183 1.10.2.2 matt 184 1.10.2.2 matt /* Attach the primary CPU here */ 185 1.10.2.2 matt sched_cpuattach(ci); 186 1.10.2.2 matt 187 1.10.2.2 matt /* Initialize the scheduler structure of the primary LWP */ 188 1.10.2.2 matt lwp0.l_mutex = &ci->ci_schedstate.spc_lwplock; 189 1.10.2.2 matt sched_lwp_fork(NULL, &lwp0); 190 1.10.2.2 matt sched_newts(&lwp0); 191 1.10.2.2 matt } 192 1.10.2.2 matt 193 1.10.2.2 matt void 194 1.10.2.2 matt sched_setup(void) 195 1.10.2.2 matt { 196 1.10.2.2 matt 197 1.10.2.2 matt #ifdef MULTIPROCESSOR 198 1.10.2.2 matt /* Minimal count of LWPs for catching: log2(count of CPUs) */ 199 1.10.2.2 matt min_catch = min(ilog2(ncpu), 4); 200 1.10.2.2 matt 201 1.10.2.2 matt /* Initialize balancing callout and run it */ 202 1.10.2.2 matt callout_init(&balance_ch, CALLOUT_MPSAFE); 203 1.10.2.2 matt callout_setfunc(&balance_ch, sched_balance, NULL); 204 1.10.2.2 matt callout_schedule(&balance_ch, balance_period); 205 1.10.2.2 matt #endif 206 1.10.2.2 matt } 207 1.10.2.2 matt 208 1.10.2.2 matt void 209 1.10.2.2 matt sched_cpuattach(struct cpu_info *ci) 210 1.10.2.2 matt { 211 1.10.2.2 matt runqueue_t *ci_rq; 212 1.10.2.2 matt void *rq_ptr; 213 1.10.2.2 matt u_int i, size; 214 1.10.2.2 matt 215 1.10.2.2 matt /* 216 1.10.2.2 matt * Allocate the run queue. 217 1.10.2.2 matt * XXX: Estimate cache behaviour more.. 218 1.10.2.2 matt */ 219 1.10.2.2 matt size = roundup(sizeof(runqueue_t), CACHE_LINE_SIZE) + CACHE_LINE_SIZE; 220 1.10.2.2 matt rq_ptr = kmem_zalloc(size, KM_NOSLEEP); 221 1.10.2.2 matt if (rq_ptr == NULL) { 222 1.10.2.2 matt panic("scheduler: could not allocate the runqueue"); 223 1.10.2.2 matt } 224 1.10.2.2 matt /* XXX: Save the original pointer for future.. */ 225 1.10.2.2 matt ci_rq = (void *)(roundup((intptr_t)(rq_ptr), CACHE_LINE_SIZE)); 226 1.10.2.2 matt 227 1.10.2.2 matt /* Initialize run queues */ 228 1.10.2.2 matt mutex_init(&ci_rq->r_rq_mutex, MUTEX_SPIN, IPL_SCHED); 229 1.10.2.2 matt for (i = 0; i < PRI_RT_COUNT; i++) 230 1.10.2.2 matt TAILQ_INIT(&ci_rq->r_rt_queue[i].q_head); 231 1.10.2.2 matt for (i = 0; i < PRI_TS_COUNT; i++) 232 1.10.2.2 matt TAILQ_INIT(&ci_rq->r_ts_queue[i].q_head); 233 1.10.2.2 matt ci_rq->r_highest_pri = 0; 234 1.10.2.2 matt 235 1.10.2.2 matt ci->ci_schedstate.spc_sched_info = ci_rq; 236 1.10.2.2 matt ci->ci_schedstate.spc_mutex = &ci_rq->r_rq_mutex; 237 1.10.2.2 matt } 238 1.10.2.2 matt 239 1.10.2.2 matt /* Pre-calculate the time-slices for the priorities */ 240 1.10.2.2 matt static void 241 1.10.2.2 matt sched_precalcts(void) 242 1.10.2.2 matt { 243 1.10.2.2 matt pri_t p; 244 1.10.2.2 matt 245 1.10.2.2 matt /* Time-sharing range */ 246 1.10.2.2 matt for (p = 0; p <= PRI_HIGHEST_TS; p++) { 247 1.10.2.2 matt ts_map[p] = max_ts - 248 1.10.2.2 matt (p * 100 / (PRI_TS_COUNT - 1) * (max_ts - min_ts) / 100); 249 1.10.2.2 matt high_pri[p] = (PRI_HIGHEST_TS - PRI_HTS_RANGE) + 250 1.10.2.2 matt ((p * PRI_HTS_RANGE) / (PRI_TS_COUNT - 1)); 251 1.10.2.2 matt } 252 1.10.2.2 matt 253 1.10.2.2 matt /* Real-time range */ 254 1.10.2.2 matt for (p = (PRI_HIGHEST_TS + 1); p < PRI_COUNT; p++) { 255 1.10.2.2 matt ts_map[p] = rt_ts; 256 1.10.2.2 matt high_pri[p] = p; 257 1.10.2.2 matt } 258 1.10.2.2 matt } 259 1.10.2.2 matt 260 1.10.2.2 matt /* 261 1.10.2.2 matt * Hooks. 262 1.10.2.2 matt */ 263 1.10.2.2 matt 264 1.10.2.2 matt void 265 1.10.2.2 matt sched_proc_fork(struct proc *parent, struct proc *child) 266 1.10.2.2 matt { 267 1.10.2.2 matt struct lwp *l; 268 1.10.2.2 matt 269 1.10.2.2 matt LIST_FOREACH(l, &child->p_lwps, l_sibling) { 270 1.10.2.2 matt lwp_lock(l); 271 1.10.2.2 matt sched_newts(l); 272 1.10.2.2 matt lwp_unlock(l); 273 1.10.2.2 matt } 274 1.10.2.2 matt } 275 1.10.2.2 matt 276 1.10.2.2 matt void 277 1.10.2.2 matt sched_proc_exit(struct proc *child, struct proc *parent) 278 1.10.2.2 matt { 279 1.10.2.2 matt 280 1.10.2.2 matt /* Dummy */ 281 1.10.2.2 matt } 282 1.10.2.2 matt 283 1.10.2.2 matt void 284 1.10.2.2 matt sched_lwp_fork(struct lwp *l1, struct lwp *l2) 285 1.10.2.2 matt { 286 1.10.2.2 matt 287 1.10.2.2 matt KASSERT(l2->l_sched_info == NULL); 288 1.10.2.2 matt l2->l_sched_info = pool_get(&sil_pool, PR_WAITOK); 289 1.10.2.2 matt memset(l2->l_sched_info, 0, sizeof(sched_info_lwp_t)); 290 1.10.2.2 matt if (l2->l_priority <= PRI_HIGHEST_TS) /* XXX: For now only.. */ 291 1.10.2.2 matt l2->l_priority = PRI_DEFAULT; 292 1.10.2.2 matt } 293 1.10.2.2 matt 294 1.10.2.2 matt void 295 1.10.2.2 matt sched_lwp_exit(struct lwp *l) 296 1.10.2.2 matt { 297 1.10.2.2 matt 298 1.10.2.2 matt KASSERT(l->l_sched_info != NULL); 299 1.10.2.2 matt pool_put(&sil_pool, l->l_sched_info); 300 1.10.2.2 matt l->l_sched_info = NULL; 301 1.10.2.2 matt } 302 1.10.2.2 matt 303 1.10.2.2 matt void 304 1.10.2.2 matt sched_lwp_collect(struct lwp *l) 305 1.10.2.2 matt { 306 1.10.2.2 matt 307 1.10.2.2 matt } 308 1.10.2.2 matt 309 1.10.2.2 matt void 310 1.10.2.2 matt sched_setrunnable(struct lwp *l) 311 1.10.2.2 matt { 312 1.10.2.2 matt 313 1.10.2.2 matt /* Dummy */ 314 1.10.2.2 matt } 315 1.10.2.2 matt 316 1.10.2.2 matt void 317 1.10.2.2 matt sched_schedclock(struct lwp *l) 318 1.10.2.2 matt { 319 1.10.2.2 matt 320 1.10.2.2 matt /* Dummy */ 321 1.10.2.2 matt } 322 1.10.2.2 matt 323 1.10.2.2 matt /* 324 1.10.2.2 matt * Priorities and time-slice. 325 1.10.2.2 matt */ 326 1.10.2.2 matt 327 1.10.2.2 matt void 328 1.10.2.2 matt sched_nice(struct proc *p, int prio) 329 1.10.2.2 matt { 330 1.10.2.2 matt int nprio; 331 1.10.2.2 matt struct lwp *l; 332 1.10.2.2 matt 333 1.10.2.2 matt KASSERT(mutex_owned(&p->p_smutex)); 334 1.10.2.2 matt 335 1.10.2.2 matt p->p_nice = prio; 336 1.10.2.2 matt nprio = max(min(PRI_DEFAULT + p->p_nice, PRI_HIGHEST_TS), 0); 337 1.10.2.2 matt 338 1.10.2.2 matt LIST_FOREACH(l, &p->p_lwps, l_sibling) { 339 1.10.2.2 matt lwp_lock(l); 340 1.10.2.2 matt lwp_changepri(l, nprio); 341 1.10.2.2 matt lwp_unlock(l); 342 1.10.2.2 matt } 343 1.10.2.2 matt } 344 1.10.2.2 matt 345 1.10.2.2 matt /* Recalculate the time-slice */ 346 1.10.2.2 matt static inline void 347 1.10.2.2 matt sched_newts(struct lwp *l) 348 1.10.2.2 matt { 349 1.10.2.2 matt sched_info_lwp_t *sil = l->l_sched_info; 350 1.10.2.2 matt 351 1.10.2.2 matt sil->sl_timeslice = ts_map[lwp_eprio(l)]; 352 1.10.2.2 matt } 353 1.10.2.2 matt 354 1.10.2.2 matt /* 355 1.10.2.2 matt * Control of the runqueue. 356 1.10.2.2 matt */ 357 1.10.2.2 matt 358 1.10.2.2 matt static inline void * 359 1.10.2.2 matt sched_getrq(runqueue_t *ci_rq, const pri_t prio) 360 1.10.2.2 matt { 361 1.10.2.2 matt 362 1.10.2.2 matt KASSERT(prio < PRI_COUNT); 363 1.10.2.2 matt return (prio <= PRI_HIGHEST_TS) ? 364 1.10.2.2 matt &ci_rq->r_ts_queue[prio].q_head : 365 1.10.2.2 matt &ci_rq->r_rt_queue[prio - PRI_HIGHEST_TS - 1].q_head; 366 1.10.2.2 matt } 367 1.10.2.2 matt 368 1.10.2.2 matt void 369 1.10.2.2 matt sched_enqueue(struct lwp *l, bool swtch) 370 1.10.2.2 matt { 371 1.10.2.2 matt runqueue_t *ci_rq; 372 1.10.2.2 matt sched_info_lwp_t *sil = l->l_sched_info; 373 1.10.2.2 matt TAILQ_HEAD(, lwp) *q_head; 374 1.10.2.2 matt const pri_t eprio = lwp_eprio(l); 375 1.10.2.2 matt 376 1.10.2.2 matt ci_rq = l->l_cpu->ci_schedstate.spc_sched_info; 377 1.10.2.2 matt KASSERT(lwp_locked(l, l->l_cpu->ci_schedstate.spc_mutex)); 378 1.10.2.2 matt 379 1.10.2.2 matt /* Update the last run time on switch */ 380 1.10.2.2 matt if (swtch == true) { 381 1.10.2.2 matt sil->sl_lrtime = hardclock_ticks; 382 1.10.2.2 matt sil->sl_rtsum += (hardclock_ticks - sil->sl_rtime); 383 1.10.2.2 matt } else if (sil->sl_lrtime == 0) 384 1.10.2.2 matt sil->sl_lrtime = hardclock_ticks; 385 1.10.2.2 matt 386 1.10.2.2 matt /* Enqueue the thread */ 387 1.10.2.2 matt q_head = sched_getrq(ci_rq, eprio); 388 1.10.2.2 matt if (TAILQ_EMPTY(q_head)) { 389 1.10.2.2 matt u_int i; 390 1.10.2.2 matt uint32_t q; 391 1.10.2.2 matt 392 1.10.2.2 matt /* Mark bit */ 393 1.10.2.2 matt i = eprio >> BITMAP_SHIFT; 394 1.10.2.2 matt q = BITMAP_MSB >> (eprio & BITMAP_MASK); 395 1.10.2.2 matt KASSERT((ci_rq->r_bitmap[i] & q) == 0); 396 1.10.2.2 matt ci_rq->r_bitmap[i] |= q; 397 1.10.2.2 matt } 398 1.10.2.2 matt TAILQ_INSERT_TAIL(q_head, l, l_runq); 399 1.10.2.2 matt ci_rq->r_count++; 400 1.10.2.2 matt if ((l->l_flag & LW_BOUND) == 0) 401 1.10.2.2 matt ci_rq->r_mcount++; 402 1.10.2.2 matt 403 1.10.2.2 matt /* 404 1.10.2.2 matt * Update the value of highest priority in the runqueue, 405 1.10.2.2 matt * if priority of this thread is higher. 406 1.10.2.2 matt */ 407 1.10.2.2 matt if (eprio > ci_rq->r_highest_pri) 408 1.10.2.2 matt ci_rq->r_highest_pri = eprio; 409 1.10.2.2 matt 410 1.10.2.2 matt sched_newts(l); 411 1.10.2.2 matt } 412 1.10.2.2 matt 413 1.10.2.2 matt void 414 1.10.2.2 matt sched_dequeue(struct lwp *l) 415 1.10.2.2 matt { 416 1.10.2.2 matt runqueue_t *ci_rq; 417 1.10.2.2 matt TAILQ_HEAD(, lwp) *q_head; 418 1.10.2.2 matt const pri_t eprio = lwp_eprio(l); 419 1.10.2.2 matt 420 1.10.2.2 matt ci_rq = l->l_cpu->ci_schedstate.spc_sched_info; 421 1.10.2.2 matt KASSERT(lwp_locked(l, l->l_cpu->ci_schedstate.spc_mutex)); 422 1.10.2.2 matt KASSERT(eprio <= ci_rq->r_highest_pri); 423 1.10.2.2 matt KASSERT(ci_rq->r_bitmap[eprio >> BITMAP_SHIFT] != 0); 424 1.10.2.2 matt KASSERT(ci_rq->r_count > 0); 425 1.10.2.2 matt 426 1.10.2.2 matt ci_rq->r_count--; 427 1.10.2.2 matt if ((l->l_flag & LW_BOUND) == 0) 428 1.10.2.2 matt ci_rq->r_mcount--; 429 1.10.2.2 matt 430 1.10.2.2 matt q_head = sched_getrq(ci_rq, eprio); 431 1.10.2.2 matt TAILQ_REMOVE(q_head, l, l_runq); 432 1.10.2.2 matt if (TAILQ_EMPTY(q_head)) { 433 1.10.2.2 matt u_int i; 434 1.10.2.2 matt uint32_t q; 435 1.10.2.2 matt 436 1.10.2.2 matt /* Unmark bit */ 437 1.10.2.2 matt i = eprio >> BITMAP_SHIFT; 438 1.10.2.2 matt q = BITMAP_MSB >> (eprio & BITMAP_MASK); 439 1.10.2.2 matt KASSERT((ci_rq->r_bitmap[i] & q) != 0); 440 1.10.2.2 matt ci_rq->r_bitmap[i] &= ~q; 441 1.10.2.2 matt 442 1.10.2.2 matt /* 443 1.10.2.2 matt * Update the value of highest priority in the runqueue, in a 444 1.10.2.2 matt * case it was a last thread in the queue of highest priority. 445 1.10.2.2 matt */ 446 1.10.2.2 matt if (eprio != ci_rq->r_highest_pri) 447 1.10.2.2 matt return; 448 1.10.2.2 matt 449 1.10.2.2 matt do { 450 1.10.2.2 matt q = ffs(ci_rq->r_bitmap[i]); 451 1.10.2.2 matt if (q) { 452 1.10.2.2 matt ci_rq->r_highest_pri = 453 1.10.2.2 matt (i << BITMAP_SHIFT) + (BITMAP_BITS - q); 454 1.10.2.2 matt return; 455 1.10.2.2 matt } 456 1.10.2.2 matt } while (i--); 457 1.10.2.2 matt 458 1.10.2.2 matt /* If not found - set the lowest value */ 459 1.10.2.2 matt ci_rq->r_highest_pri = 0; 460 1.10.2.2 matt } 461 1.10.2.2 matt } 462 1.10.2.2 matt 463 1.10.2.2 matt void 464 1.10.2.2 matt sched_slept(struct lwp *l) 465 1.10.2.2 matt { 466 1.10.2.2 matt sched_info_lwp_t *sil = l->l_sched_info; 467 1.10.2.2 matt 468 1.10.2.2 matt /* Save the time when thread has slept */ 469 1.10.2.2 matt sil->sl_slept = hardclock_ticks; 470 1.10.2.2 matt 471 1.10.2.2 matt /* 472 1.10.2.2 matt * If thread is in time-sharing queue and batch flag is not marked, 473 1.10.2.2 matt * increase the the priority, and run with the lower time-quantum. 474 1.10.2.2 matt */ 475 1.10.2.2 matt if (l->l_priority < PRI_HIGHEST_TS && (sil->sl_flags & SL_BATCH) == 0) { 476 1.10.2.2 matt KASSERT(l->l_class == SCHED_OTHER); 477 1.10.2.2 matt l->l_priority++; 478 1.10.2.2 matt } 479 1.10.2.2 matt } 480 1.10.2.2 matt 481 1.10.2.2 matt void 482 1.10.2.2 matt sched_wakeup(struct lwp *l) 483 1.10.2.2 matt { 484 1.10.2.2 matt sched_info_lwp_t *sil = l->l_sched_info; 485 1.10.2.2 matt 486 1.10.2.2 matt /* Update sleep time delta */ 487 1.10.2.2 matt sil->sl_slpsum += (l->l_slptime == 0) ? 488 1.10.2.2 matt (hardclock_ticks - sil->sl_slept) : hz; 489 1.10.2.2 matt 490 1.10.2.2 matt /* If thread was sleeping a second or more - set a high priority */ 491 1.10.2.2 matt if (l->l_slptime > 1 || (hardclock_ticks - sil->sl_slept) >= hz) 492 1.10.2.2 matt l->l_priority = high_pri[l->l_priority]; 493 1.10.2.2 matt 494 1.10.2.2 matt /* Also, consider looking for a better CPU to wake up */ 495 1.10.2.2 matt if ((l->l_flag & (LW_BOUND | LW_SYSTEM)) == 0) 496 1.10.2.2 matt l->l_cpu = sched_takecpu(l); 497 1.10.2.2 matt } 498 1.10.2.2 matt 499 1.10.2.2 matt void 500 1.10.2.2 matt sched_pstats_hook(struct lwp *l) 501 1.10.2.2 matt { 502 1.10.2.2 matt sched_info_lwp_t *sil = l->l_sched_info; 503 1.10.2.2 matt bool batch; 504 1.10.2.2 matt 505 1.10.2.2 matt if (l->l_stat == LSSLEEP || l->l_stat == LSSTOP || 506 1.10.2.2 matt l->l_stat == LSSUSPENDED) 507 1.10.2.2 matt l->l_slptime++; 508 1.10.2.2 matt 509 1.10.2.2 matt /* 510 1.10.2.2 matt * Set that thread is more CPU-bound, if sum of run time exceeds the 511 1.10.2.2 matt * sum of sleep time. Check if thread is CPU-bound a first time. 512 1.10.2.2 matt */ 513 1.10.2.2 matt batch = (sil->sl_rtsum > sil->sl_slpsum); 514 1.10.2.2 matt if (batch) { 515 1.10.2.2 matt if ((sil->sl_flags & SL_BATCH) == 0) 516 1.10.2.2 matt batch = false; 517 1.10.2.2 matt sil->sl_flags |= SL_BATCH; 518 1.10.2.2 matt } else 519 1.10.2.2 matt sil->sl_flags &= ~SL_BATCH; 520 1.10.2.2 matt 521 1.10.2.2 matt /* Reset the time sums */ 522 1.10.2.2 matt sil->sl_slpsum = 0; 523 1.10.2.2 matt sil->sl_rtsum = 0; 524 1.10.2.2 matt 525 1.10.2.2 matt /* Estimate threads on time-sharing queue only */ 526 1.10.2.2 matt if (l->l_priority >= PRI_HIGHEST_TS) 527 1.10.2.2 matt return; 528 1.10.2.2 matt 529 1.10.2.2 matt /* If it is CPU-bound not a first time - decrease the priority */ 530 1.10.2.2 matt if (batch && l->l_priority != 0) 531 1.10.2.2 matt l->l_priority--; 532 1.10.2.2 matt 533 1.10.2.2 matt /* If thread was not ran a second or more - set a high priority */ 534 1.10.2.2 matt if (l->l_stat == LSRUN && sil->sl_lrtime && 535 1.10.2.2 matt (hardclock_ticks - sil->sl_lrtime >= hz)) 536 1.10.2.2 matt lwp_changepri(l, high_pri[l->l_priority]); 537 1.10.2.2 matt } 538 1.10.2.2 matt 539 1.10.2.2 matt /* 540 1.10.2.2 matt * Migration and balancing. 541 1.10.2.2 matt */ 542 1.10.2.2 matt 543 1.10.2.2 matt #ifdef MULTIPROCESSOR 544 1.10.2.2 matt 545 1.10.2.2 matt /* Check if LWP can migrate to the chosen CPU */ 546 1.10.2.2 matt static inline bool 547 1.10.2.2 matt sched_migratable(const struct lwp *l, const struct cpu_info *ci) 548 1.10.2.2 matt { 549 1.10.2.2 matt 550 1.10.2.2 matt if (ci->ci_schedstate.spc_flags & SPCF_OFFLINE) 551 1.10.2.2 matt return false; 552 1.10.2.2 matt 553 1.10.2.2 matt if ((l->l_flag & LW_BOUND) == 0) 554 1.10.2.2 matt return true; 555 1.10.2.2 matt #if 0 556 1.10.2.2 matt return cpu_in_pset(ci, l->l_psid); 557 1.10.2.2 matt #else 558 1.10.2.2 matt return false; 559 1.10.2.2 matt #endif 560 1.10.2.2 matt } 561 1.10.2.2 matt 562 1.10.2.2 matt /* 563 1.10.2.2 matt * Estimate the migration of LWP to the other CPU. 564 1.10.2.2 matt * Take and return the CPU, if migration is needed. 565 1.10.2.2 matt */ 566 1.10.2.2 matt struct cpu_info * 567 1.10.2.2 matt sched_takecpu(struct lwp *l) 568 1.10.2.2 matt { 569 1.10.2.2 matt struct cpu_info *ci, *tci = NULL; 570 1.10.2.2 matt struct schedstate_percpu *spc; 571 1.10.2.2 matt runqueue_t *ci_rq; 572 1.10.2.2 matt sched_info_lwp_t *sil; 573 1.10.2.2 matt CPU_INFO_ITERATOR cii; 574 1.10.2.2 matt pri_t eprio, lpri; 575 1.10.2.2 matt 576 1.10.2.2 matt ci = l->l_cpu; 577 1.10.2.2 matt spc = &ci->ci_schedstate; 578 1.10.2.2 matt ci_rq = spc->spc_sched_info; 579 1.10.2.2 matt 580 1.10.2.2 matt /* CPU of this thread is idling - run there */ 581 1.10.2.2 matt if (ci_rq->r_count == 0) 582 1.10.2.2 matt return ci; 583 1.10.2.2 matt 584 1.10.2.2 matt eprio = lwp_eprio(l); 585 1.10.2.2 matt sil = l->l_sched_info; 586 1.10.2.2 matt 587 1.10.2.2 matt /* Stay if thread is cache-hot */ 588 1.10.2.2 matt if (l->l_stat == LSSLEEP && l->l_slptime <= 1 && 589 1.10.2.2 matt CACHE_HOT(sil) && eprio >= spc->spc_curpriority) 590 1.10.2.2 matt return ci; 591 1.10.2.2 matt 592 1.10.2.2 matt /* Run on current CPU if priority of thread is higher */ 593 1.10.2.2 matt ci = curcpu(); 594 1.10.2.2 matt spc = &ci->ci_schedstate; 595 1.10.2.2 matt if (eprio > spc->spc_curpriority && sched_migratable(l, ci)) 596 1.10.2.2 matt return ci; 597 1.10.2.2 matt 598 1.10.2.2 matt /* 599 1.10.2.2 matt * Look for the CPU with the lowest priority thread. In case of 600 1.10.2.2 matt * equal the priority - check the lower count of the threads. 601 1.10.2.2 matt */ 602 1.10.2.2 matt lpri = PRI_COUNT; 603 1.10.2.2 matt for (CPU_INFO_FOREACH(cii, ci)) { 604 1.10.2.2 matt runqueue_t *ici_rq; 605 1.10.2.2 matt pri_t pri; 606 1.10.2.2 matt 607 1.10.2.2 matt spc = &ci->ci_schedstate; 608 1.10.2.2 matt ici_rq = spc->spc_sched_info; 609 1.10.2.2 matt pri = max(spc->spc_curpriority, ici_rq->r_highest_pri); 610 1.10.2.2 matt if (pri > lpri) 611 1.10.2.2 matt continue; 612 1.10.2.2 matt 613 1.10.2.2 matt if (pri == lpri && tci && ci_rq->r_count < ici_rq->r_count) 614 1.10.2.2 matt continue; 615 1.10.2.2 matt 616 1.10.2.2 matt if (sched_migratable(l, ci) == false) 617 1.10.2.2 matt continue; 618 1.10.2.2 matt 619 1.10.2.2 matt lpri = pri; 620 1.10.2.2 matt tci = ci; 621 1.10.2.2 matt ci_rq = ici_rq; 622 1.10.2.2 matt } 623 1.10.2.2 matt 624 1.10.2.2 matt KASSERT(tci != NULL); 625 1.10.2.2 matt return tci; 626 1.10.2.2 matt } 627 1.10.2.2 matt 628 1.10.2.2 matt /* 629 1.10.2.2 matt * Tries to catch an LWP from the runqueue of other CPU. 630 1.10.2.2 matt */ 631 1.10.2.2 matt static struct lwp * 632 1.10.2.2 matt sched_catchlwp(void) 633 1.10.2.2 matt { 634 1.10.2.2 matt struct cpu_info *curci = curcpu(), *ci = worker_ci; 635 1.10.2.2 matt TAILQ_HEAD(, lwp) *q_head; 636 1.10.2.2 matt runqueue_t *ci_rq; 637 1.10.2.2 matt struct lwp *l; 638 1.10.2.2 matt 639 1.10.2.2 matt if (curci == ci) 640 1.10.2.2 matt return NULL; 641 1.10.2.2 matt 642 1.10.2.2 matt /* Lockless check */ 643 1.10.2.2 matt ci_rq = ci->ci_schedstate.spc_sched_info; 644 1.10.2.2 matt if (ci_rq->r_count < min_catch) 645 1.10.2.2 matt return NULL; 646 1.10.2.2 matt 647 1.10.2.2 matt /* 648 1.10.2.2 matt * Double-lock the runqueues. 649 1.10.2.2 matt */ 650 1.10.2.2 matt if (curci < ci) { 651 1.10.2.2 matt spc_lock(ci); 652 1.10.2.2 matt } else if (!mutex_tryenter(ci->ci_schedstate.spc_mutex)) { 653 1.10.2.2 matt const runqueue_t *cur_rq = curci->ci_schedstate.spc_sched_info; 654 1.10.2.2 matt 655 1.10.2.2 matt spc_unlock(curci); 656 1.10.2.2 matt spc_lock(ci); 657 1.10.2.2 matt spc_lock(curci); 658 1.10.2.2 matt 659 1.10.2.2 matt if (cur_rq->r_count) { 660 1.10.2.2 matt spc_unlock(ci); 661 1.10.2.2 matt return NULL; 662 1.10.2.2 matt } 663 1.10.2.2 matt } 664 1.10.2.2 matt 665 1.10.2.2 matt if (ci_rq->r_count < min_catch) { 666 1.10.2.2 matt spc_unlock(ci); 667 1.10.2.2 matt return NULL; 668 1.10.2.2 matt } 669 1.10.2.2 matt 670 1.10.2.2 matt /* Take the highest priority thread */ 671 1.10.2.2 matt q_head = sched_getrq(ci_rq, ci_rq->r_highest_pri); 672 1.10.2.2 matt l = TAILQ_FIRST(q_head); 673 1.10.2.2 matt 674 1.10.2.2 matt for (;;) { 675 1.10.2.2 matt sched_info_lwp_t *sil; 676 1.10.2.2 matt 677 1.10.2.2 matt /* Check the first and next result from the queue */ 678 1.10.2.2 matt if (l == NULL) 679 1.10.2.2 matt break; 680 1.10.2.2 matt 681 1.10.2.2 matt /* Look for threads, whose are allowed to migrate */ 682 1.10.2.2 matt sil = l->l_sched_info; 683 1.10.2.2 matt if ((l->l_flag & LW_SYSTEM) || CACHE_HOT(sil) || 684 1.10.2.2 matt sched_migratable(l, curci) == false) { 685 1.10.2.2 matt l = TAILQ_NEXT(l, l_runq); 686 1.10.2.2 matt continue; 687 1.10.2.2 matt } 688 1.10.2.2 matt /* Recheck if chosen thread is still on the runqueue */ 689 1.10.2.2 matt if (l->l_stat == LSRUN && (l->l_flag & LW_INMEM)) { 690 1.10.2.2 matt sched_dequeue(l); 691 1.10.2.2 matt l->l_cpu = curci; 692 1.10.2.2 matt lwp_setlock(l, curci->ci_schedstate.spc_mutex); 693 1.10.2.2 matt sched_enqueue(l, false); 694 1.10.2.2 matt break; 695 1.10.2.2 matt } 696 1.10.2.2 matt l = TAILQ_NEXT(l, l_runq); 697 1.10.2.2 matt } 698 1.10.2.2 matt spc_unlock(ci); 699 1.10.2.2 matt 700 1.10.2.2 matt return l; 701 1.10.2.2 matt } 702 1.10.2.2 matt 703 1.10.2.2 matt /* 704 1.10.2.2 matt * Periodical calculations for balancing. 705 1.10.2.2 matt */ 706 1.10.2.2 matt static void 707 1.10.2.2 matt sched_balance(void *nocallout) 708 1.10.2.2 matt { 709 1.10.2.2 matt struct cpu_info *ci, *hci; 710 1.10.2.2 matt runqueue_t *ci_rq; 711 1.10.2.2 matt CPU_INFO_ITERATOR cii; 712 1.10.2.2 matt u_int highest; 713 1.10.2.2 matt 714 1.10.2.2 matt hci = curcpu(); 715 1.10.2.2 matt highest = 0; 716 1.10.2.2 matt 717 1.10.2.2 matt /* Make lockless countings */ 718 1.10.2.2 matt for (CPU_INFO_FOREACH(cii, ci)) { 719 1.10.2.2 matt ci_rq = ci->ci_schedstate.spc_sched_info; 720 1.10.2.2 matt 721 1.10.2.2 matt /* Average count of the threads */ 722 1.10.2.2 matt ci_rq->r_avgcount = (ci_rq->r_avgcount + ci_rq->r_mcount) >> 1; 723 1.10.2.2 matt 724 1.10.2.2 matt /* Look for CPU with the highest average */ 725 1.10.2.2 matt if (ci_rq->r_avgcount > highest) { 726 1.10.2.2 matt hci = ci; 727 1.10.2.2 matt highest = ci_rq->r_avgcount; 728 1.10.2.2 matt } 729 1.10.2.2 matt } 730 1.10.2.2 matt 731 1.10.2.2 matt /* Update the worker */ 732 1.10.2.2 matt worker_ci = hci; 733 1.10.2.2 matt 734 1.10.2.2 matt if (nocallout == NULL) 735 1.10.2.2 matt callout_schedule(&balance_ch, balance_period); 736 1.10.2.2 matt } 737 1.10.2.2 matt 738 1.10.2.2 matt #else 739 1.10.2.2 matt 740 1.10.2.2 matt struct cpu_info * 741 1.10.2.2 matt sched_takecpu(struct lwp *l) 742 1.10.2.2 matt { 743 1.10.2.2 matt 744 1.10.2.2 matt return l->l_cpu; 745 1.10.2.2 matt } 746 1.10.2.2 matt 747 1.10.2.2 matt #endif /* MULTIPROCESSOR */ 748 1.10.2.2 matt 749 1.10.2.2 matt /* 750 1.10.2.2 matt * Scheduler mill. 751 1.10.2.2 matt */ 752 1.10.2.2 matt struct lwp * 753 1.10.2.2 matt sched_nextlwp(void) 754 1.10.2.2 matt { 755 1.10.2.2 matt struct cpu_info *ci = curcpu(); 756 1.10.2.2 matt struct schedstate_percpu *spc; 757 1.10.2.2 matt TAILQ_HEAD(, lwp) *q_head; 758 1.10.2.2 matt sched_info_lwp_t *sil; 759 1.10.2.2 matt runqueue_t *ci_rq; 760 1.10.2.2 matt struct lwp *l; 761 1.10.2.2 matt 762 1.10.2.2 matt spc = &ci->ci_schedstate; 763 1.10.2.2 matt ci_rq = ci->ci_schedstate.spc_sched_info; 764 1.10.2.2 matt 765 1.10.2.2 matt #ifdef MULTIPROCESSOR 766 1.10.2.2 matt /* If runqueue is empty, try to catch some thread from other CPU */ 767 1.10.2.2 matt if (spc->spc_flags & SPCF_OFFLINE) { 768 1.10.2.2 matt if ((ci_rq->r_count - ci_rq->r_mcount) == 0) 769 1.10.2.2 matt return NULL; 770 1.10.2.2 matt } else if (ci_rq->r_count == 0) { 771 1.10.2.2 matt /* Reset the counter, and call the balancer */ 772 1.10.2.2 matt ci_rq->r_avgcount = 0; 773 1.10.2.2 matt sched_balance(ci); 774 1.10.2.2 matt 775 1.10.2.2 matt /* The re-locking will be done inside */ 776 1.10.2.2 matt return sched_catchlwp(); 777 1.10.2.2 matt } 778 1.10.2.2 matt #else 779 1.10.2.2 matt if (ci_rq->r_count == 0) 780 1.10.2.2 matt return NULL; 781 1.10.2.2 matt #endif 782 1.10.2.2 matt 783 1.10.2.2 matt /* Take the highest priority thread */ 784 1.10.2.2 matt KASSERT(ci_rq->r_bitmap[ci_rq->r_highest_pri >> BITMAP_SHIFT]); 785 1.10.2.2 matt q_head = sched_getrq(ci_rq, ci_rq->r_highest_pri); 786 1.10.2.2 matt l = TAILQ_FIRST(q_head); 787 1.10.2.2 matt KASSERT(l != NULL); 788 1.10.2.2 matt 789 1.10.2.2 matt /* Update the counters */ 790 1.10.2.2 matt sil = l->l_sched_info; 791 1.10.2.2 matt KASSERT(sil->sl_timeslice >= min_ts); 792 1.10.2.2 matt KASSERT(sil->sl_timeslice <= max_ts); 793 1.10.2.2 matt spc->spc_ticks = sil->sl_timeslice; 794 1.10.2.2 matt sil->sl_rtime = hardclock_ticks; 795 1.10.2.2 matt 796 1.10.2.2 matt return l; 797 1.10.2.2 matt } 798 1.10.2.2 matt 799 1.10.2.2 matt bool 800 1.10.2.2 matt sched_curcpu_runnable_p(void) 801 1.10.2.2 matt { 802 1.10.2.2 matt const struct cpu_info *ci = curcpu(); 803 1.10.2.2 matt const runqueue_t *ci_rq = ci->ci_schedstate.spc_sched_info; 804 1.10.2.2 matt 805 1.10.2.2 matt if (ci->ci_schedstate.spc_flags & SPCF_OFFLINE) 806 1.10.2.2 matt return (ci_rq->r_count - ci_rq->r_mcount); 807 1.10.2.2 matt 808 1.10.2.2 matt return ci_rq->r_count; 809 1.10.2.2 matt } 810 1.10.2.2 matt 811 1.10.2.2 matt /* 812 1.10.2.2 matt * Time-driven events. 813 1.10.2.2 matt */ 814 1.10.2.2 matt 815 1.10.2.2 matt /* 816 1.10.2.2 matt * Called once per time-quantum. This routine is CPU-local and runs at 817 1.10.2.2 matt * IPL_SCHED, thus the locking is not needed. 818 1.10.2.2 matt */ 819 1.10.2.2 matt void 820 1.10.2.2 matt sched_tick(struct cpu_info *ci) 821 1.10.2.2 matt { 822 1.10.2.2 matt const runqueue_t *ci_rq = ci->ci_schedstate.spc_sched_info; 823 1.10.2.2 matt struct schedstate_percpu *spc = &ci->ci_schedstate; 824 1.10.2.2 matt struct lwp *l = curlwp; 825 1.10.2.2 matt sched_info_lwp_t *sil = l->l_sched_info; 826 1.10.2.2 matt 827 1.10.2.2 matt if (CURCPU_IDLE_P()) 828 1.10.2.2 matt return; 829 1.10.2.2 matt 830 1.10.2.2 matt switch (l->l_class) { 831 1.10.2.2 matt case SCHED_FIFO: 832 1.10.2.2 matt /* 833 1.10.2.2 matt * Update the time-quantum, and continue running, 834 1.10.2.2 matt * if thread runs on FIFO real-time policy. 835 1.10.2.2 matt */ 836 1.10.2.2 matt spc->spc_ticks = sil->sl_timeslice; 837 1.10.2.2 matt return; 838 1.10.2.2 matt case SCHED_OTHER: 839 1.10.2.2 matt /* 840 1.10.2.2 matt * If thread is in time-sharing queue, decrease the priority, 841 1.10.2.2 matt * and run with a higher time-quantum. 842 1.10.2.2 matt */ 843 1.10.2.2 matt if (l->l_priority > PRI_HIGHEST_TS) 844 1.10.2.2 matt break; 845 1.10.2.2 matt if (l->l_priority != 0) 846 1.10.2.2 matt l->l_priority--; 847 1.10.2.2 matt break; 848 1.10.2.2 matt } 849 1.10.2.2 matt 850 1.10.2.2 matt /* 851 1.10.2.2 matt * If there are higher priority threads or threads in the same queue, 852 1.10.2.2 matt * mark that thread should yield, otherwise, continue running. 853 1.10.2.2 matt */ 854 1.10.2.2 matt if (lwp_eprio(l) <= ci_rq->r_highest_pri) { 855 1.10.2.2 matt spc->spc_flags |= SPCF_SHOULDYIELD; 856 1.10.2.2 matt cpu_need_resched(ci, 0); 857 1.10.2.2 matt } else 858 1.10.2.2 matt spc->spc_ticks = sil->sl_timeslice; 859 1.10.2.2 matt } 860 1.10.2.2 matt 861 1.10.2.2 matt /* 862 1.10.2.2 matt * Sysctl nodes and initialization. 863 1.10.2.2 matt */ 864 1.10.2.2 matt 865 1.10.2.2 matt static int 866 1.10.2.2 matt sysctl_sched_mints(SYSCTLFN_ARGS) 867 1.10.2.2 matt { 868 1.10.2.2 matt struct sysctlnode node; 869 1.10.2.2 matt struct cpu_info *ci; 870 1.10.2.2 matt int error, newsize; 871 1.10.2.2 matt CPU_INFO_ITERATOR cii; 872 1.10.2.2 matt 873 1.10.2.2 matt node = *rnode; 874 1.10.2.2 matt node.sysctl_data = &newsize; 875 1.10.2.2 matt 876 1.10.2.2 matt newsize = hztoms(min_ts); 877 1.10.2.2 matt error = sysctl_lookup(SYSCTLFN_CALL(&node)); 878 1.10.2.2 matt if (error || newp == NULL) 879 1.10.2.2 matt return error; 880 1.10.2.2 matt 881 1.10.2.2 matt newsize = mstohz(newsize); 882 1.10.2.2 matt if (newsize < 1 || newsize > hz || newsize >= max_ts) 883 1.10.2.2 matt return EINVAL; 884 1.10.2.2 matt 885 1.10.2.2 matt /* It is safe to do this in such order */ 886 1.10.2.2 matt for (CPU_INFO_FOREACH(cii, ci)) 887 1.10.2.2 matt spc_lock(ci); 888 1.10.2.2 matt 889 1.10.2.2 matt min_ts = newsize; 890 1.10.2.2 matt sched_precalcts(); 891 1.10.2.2 matt 892 1.10.2.2 matt for (CPU_INFO_FOREACH(cii, ci)) 893 1.10.2.2 matt spc_unlock(ci); 894 1.10.2.2 matt 895 1.10.2.2 matt return 0; 896 1.10.2.2 matt } 897 1.10.2.2 matt 898 1.10.2.2 matt static int 899 1.10.2.2 matt sysctl_sched_maxts(SYSCTLFN_ARGS) 900 1.10.2.2 matt { 901 1.10.2.2 matt struct sysctlnode node; 902 1.10.2.2 matt struct cpu_info *ci; 903 1.10.2.2 matt int error, newsize; 904 1.10.2.2 matt CPU_INFO_ITERATOR cii; 905 1.10.2.2 matt 906 1.10.2.2 matt node = *rnode; 907 1.10.2.2 matt node.sysctl_data = &newsize; 908 1.10.2.2 matt 909 1.10.2.2 matt newsize = hztoms(max_ts); 910 1.10.2.2 matt error = sysctl_lookup(SYSCTLFN_CALL(&node)); 911 1.10.2.2 matt if (error || newp == NULL) 912 1.10.2.2 matt return error; 913 1.10.2.2 matt 914 1.10.2.2 matt newsize = mstohz(newsize); 915 1.10.2.2 matt if (newsize < 10 || newsize > hz || newsize <= min_ts) 916 1.10.2.2 matt return EINVAL; 917 1.10.2.2 matt 918 1.10.2.2 matt /* It is safe to do this in such order */ 919 1.10.2.2 matt for (CPU_INFO_FOREACH(cii, ci)) 920 1.10.2.2 matt spc_lock(ci); 921 1.10.2.2 matt 922 1.10.2.2 matt max_ts = newsize; 923 1.10.2.2 matt sched_precalcts(); 924 1.10.2.2 matt 925 1.10.2.2 matt for (CPU_INFO_FOREACH(cii, ci)) 926 1.10.2.2 matt spc_unlock(ci); 927 1.10.2.2 matt 928 1.10.2.2 matt return 0; 929 1.10.2.2 matt } 930 1.10.2.2 matt 931 1.10.2.2 matt SYSCTL_SETUP(sysctl_sched_setup, "sysctl kern.sched subtree setup") 932 1.10.2.2 matt { 933 1.10.2.2 matt const struct sysctlnode *node = NULL; 934 1.10.2.2 matt 935 1.10.2.2 matt sysctl_createv(clog, 0, NULL, NULL, 936 1.10.2.2 matt CTLFLAG_PERMANENT, 937 1.10.2.2 matt CTLTYPE_NODE, "kern", NULL, 938 1.10.2.2 matt NULL, 0, NULL, 0, 939 1.10.2.2 matt CTL_KERN, CTL_EOL); 940 1.10.2.2 matt sysctl_createv(clog, 0, NULL, &node, 941 1.10.2.2 matt CTLFLAG_PERMANENT, 942 1.10.2.2 matt CTLTYPE_NODE, "sched", 943 1.10.2.2 matt SYSCTL_DESCR("Scheduler options"), 944 1.10.2.2 matt NULL, 0, NULL, 0, 945 1.10.2.2 matt CTL_KERN, CTL_CREATE, CTL_EOL); 946 1.10.2.2 matt 947 1.10.2.2 matt if (node == NULL) 948 1.10.2.2 matt return; 949 1.10.2.2 matt 950 1.10.2.2 matt sysctl_createv(clog, 0, &node, NULL, 951 1.10.2.2 matt CTLFLAG_PERMANENT, 952 1.10.2.2 matt CTLTYPE_STRING, "name", NULL, 953 1.10.2.2 matt NULL, 0, __UNCONST("M2"), 0, 954 1.10.2.2 matt CTL_CREATE, CTL_EOL); 955 1.10.2.2 matt sysctl_createv(clog, 0, &node, NULL, 956 1.10.2.2 matt CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 957 1.10.2.2 matt CTLTYPE_INT, "maxts", 958 1.10.2.2 matt SYSCTL_DESCR("Maximal time quantum (in miliseconds)"), 959 1.10.2.2 matt sysctl_sched_maxts, 0, &max_ts, 0, 960 1.10.2.2 matt CTL_CREATE, CTL_EOL); 961 1.10.2.2 matt sysctl_createv(clog, 0, &node, NULL, 962 1.10.2.2 matt CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 963 1.10.2.2 matt CTLTYPE_INT, "mints", 964 1.10.2.2 matt SYSCTL_DESCR("Minimal time quantum (in miliseconds)"), 965 1.10.2.2 matt sysctl_sched_mints, 0, &min_ts, 0, 966 1.10.2.2 matt CTL_CREATE, CTL_EOL); 967 1.10.2.2 matt 968 1.10.2.2 matt #ifdef MULTIPROCESSOR 969 1.10.2.2 matt sysctl_createv(clog, 0, &node, NULL, 970 1.10.2.2 matt CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 971 1.10.2.2 matt CTLTYPE_INT, "cacheht_time", 972 1.10.2.2 matt SYSCTL_DESCR("Cache hotness time (in ticks)"), 973 1.10.2.2 matt NULL, 0, &cacheht_time, 0, 974 1.10.2.2 matt CTL_CREATE, CTL_EOL); 975 1.10.2.2 matt sysctl_createv(clog, 0, &node, NULL, 976 1.10.2.2 matt CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 977 1.10.2.2 matt CTLTYPE_INT, "balance_period", 978 1.10.2.2 matt SYSCTL_DESCR("Balance period (in ticks)"), 979 1.10.2.2 matt NULL, 0, &balance_period, 0, 980 1.10.2.2 matt CTL_CREATE, CTL_EOL); 981 1.10.2.2 matt sysctl_createv(clog, 0, &node, NULL, 982 1.10.2.2 matt CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 983 1.10.2.2 matt CTLTYPE_INT, "min_catch", 984 1.10.2.2 matt SYSCTL_DESCR("Minimal count of the threads for catching"), 985 1.10.2.2 matt NULL, 0, &min_catch, 0, 986 1.10.2.2 matt CTL_CREATE, CTL_EOL); 987 1.10.2.2 matt #endif 988 1.10.2.2 matt } 989 1.10.2.2 matt 990 1.10.2.2 matt /* 991 1.10.2.2 matt * Debugging. 992 1.10.2.2 matt */ 993 1.10.2.2 matt 994 1.10.2.2 matt #ifdef DDB 995 1.10.2.2 matt 996 1.10.2.2 matt void 997 1.10.2.2 matt sched_print_runqueue(void (*pr)(const char *, ...)) 998 1.10.2.2 matt { 999 1.10.2.2 matt runqueue_t *ci_rq; 1000 1.10.2.2 matt sched_info_lwp_t *sil; 1001 1.10.2.2 matt struct lwp *l; 1002 1.10.2.2 matt struct proc *p; 1003 1.10.2.2 matt int i; 1004 1.10.2.2 matt 1005 1.10.2.2 matt struct cpu_info *ci; 1006 1.10.2.2 matt CPU_INFO_ITERATOR cii; 1007 1.10.2.2 matt 1008 1.10.2.2 matt for (CPU_INFO_FOREACH(cii, ci)) { 1009 1.10.2.2 matt ci_rq = ci->ci_schedstate.spc_sched_info; 1010 1.10.2.2 matt 1011 1.10.2.2 matt (*pr)("Run-queue (CPU = %d):\n", ci->ci_cpuid); 1012 1.10.2.2 matt (*pr)(" pid.lid = %d.%d, threads count = %u, " 1013 1.10.2.2 matt "avgcount = %u, highest pri = %d\n", 1014 1.10.2.2 matt ci->ci_curlwp->l_proc->p_pid, ci->ci_curlwp->l_lid, 1015 1.10.2.2 matt ci_rq->r_count, ci_rq->r_avgcount, ci_rq->r_highest_pri); 1016 1.10.2.2 matt i = (PRI_COUNT >> BITMAP_SHIFT) - 1; 1017 1.10.2.2 matt do { 1018 1.10.2.2 matt uint32_t q; 1019 1.10.2.2 matt q = ci_rq->r_bitmap[i]; 1020 1.10.2.2 matt (*pr)(" bitmap[%d] => [ %d (0x%x) ]\n", i, ffs(q), q); 1021 1.10.2.2 matt } while (i--); 1022 1.10.2.2 matt } 1023 1.10.2.2 matt 1024 1.10.2.2 matt (*pr)(" %5s %4s %4s %10s %3s %4s %11s %3s %s\n", 1025 1.10.2.2 matt "LID", "PRI", "EPRI", "FL", "ST", "TS", "LWP", "CPU", "LRTIME"); 1026 1.10.2.2 matt 1027 1.10.2.2 matt PROCLIST_FOREACH(p, &allproc) { 1028 1.10.2.2 matt (*pr)(" /- %d (%s)\n", (int)p->p_pid, p->p_comm); 1029 1.10.2.2 matt LIST_FOREACH(l, &p->p_lwps, l_sibling) { 1030 1.10.2.2 matt sil = l->l_sched_info; 1031 1.10.2.2 matt ci = l->l_cpu; 1032 1.10.2.2 matt (*pr)(" | %5d %4u %4u 0x%8.8x %3s %4u %11p %3d " 1033 1.10.2.2 matt "%u ST=%d RT=%d %d\n", 1034 1.10.2.2 matt (int)l->l_lid, l->l_priority, lwp_eprio(l), 1035 1.10.2.2 matt l->l_flag, l->l_stat == LSRUN ? "RQ" : 1036 1.10.2.2 matt (l->l_stat == LSSLEEP ? "SQ" : "-"), 1037 1.10.2.2 matt sil->sl_timeslice, l, ci->ci_cpuid, 1038 1.10.2.2 matt (u_int)(hardclock_ticks - sil->sl_lrtime), 1039 1.10.2.2 matt sil->sl_slpsum, sil->sl_rtsum, sil->sl_flags); 1040 1.10.2.2 matt } 1041 1.10.2.2 matt } 1042 1.10.2.2 matt } 1043 1.10.2.2 matt 1044 1.10.2.2 matt #endif /* defined(DDB) */ 1045
Indexes created Thu Oct 02 07:10:07 GMT 2025