| 1 | /* |
| 2 | * Copyright (c) 1999 Peter Wemm <peter@FreeBSD.org> |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 24 | * SUCH DAMAGE. |
| 25 | */ |
| 26 | |
| 27 | #include <sys/param.h> |
| 28 | #include <sys/systm.h> |
| 29 | #include <sys/kernel.h> |
| 30 | #include <sys/lock.h> |
| 31 | #include <sys/queue.h> |
| 32 | #include <sys/proc.h> |
| 33 | #include <sys/rtprio.h> |
| 34 | #include <sys/uio.h> |
| 35 | #include <sys/sysctl.h> |
| 36 | #include <sys/resourcevar.h> |
| 37 | #include <sys/spinlock.h> |
| 38 | #include <sys/cpu_topology.h> |
| 39 | #include <sys/thread2.h> |
| 40 | #include <sys/spinlock2.h> |
| 41 | #include <sys/mplock2.h> |
| 42 | |
| 43 | #include <sys/ktr.h> |
| 44 | |
| 45 | #include <machine/cpu.h> |
| 46 | #include <machine/smp.h> |
| 47 | |
| 48 | /* |
| 49 | * Priorities. Note that with 32 run queues per scheduler each queue |
| 50 | * represents four priority levels. |
| 51 | */ |
| 52 | |
| 53 | #define MAXPRI 128 |
| 54 | #define PRIMASK (MAXPRI - 1) |
| 55 | #define PRIBASE_REALTIME 0 |
| 56 | #define PRIBASE_NORMAL MAXPRI |
| 57 | #define PRIBASE_IDLE (MAXPRI * 2) |
| 58 | #define PRIBASE_THREAD (MAXPRI * 3) |
| 59 | #define PRIBASE_NULL (MAXPRI * 4) |
| 60 | |
| 61 | #define NQS 32 /* 32 run queues. */ |
| 62 | #define PPQ (MAXPRI / NQS) /* priorities per queue */ |
| 63 | #define PPQMASK (PPQ - 1) |
| 64 | |
| 65 | /* |
| 66 | * NICEPPQ - number of nice units per priority queue |
| 67 | * |
| 68 | * ESTCPUPPQ - number of estcpu units per priority queue |
| 69 | * ESTCPUMAX - number of estcpu units |
| 70 | */ |
| 71 | #define NICEPPQ 2 |
| 72 | #define ESTCPUPPQ 512 |
| 73 | #define ESTCPUMAX (ESTCPUPPQ * NQS) |
| 74 | #define BATCHMAX (ESTCPUFREQ * 30) |
| 75 | #define PRIO_RANGE (PRIO_MAX - PRIO_MIN + 1) |
| 76 | |
| 77 | #define ESTCPULIM(v) min((v), ESTCPUMAX) |
| 78 | |
| 79 | TAILQ_HEAD(rq, lwp); |
| 80 | |
| 81 | #define lwp_priority lwp_usdata.bsd4.priority |
| 82 | #define lwp_rqindex lwp_usdata.bsd4.rqindex |
| 83 | #define lwp_estcpu lwp_usdata.bsd4.estcpu |
| 84 | #define lwp_batch lwp_usdata.bsd4.batch |
| 85 | #define lwp_rqtype lwp_usdata.bsd4.rqtype |
| 86 | |
| 87 | static void bsd4_acquire_curproc(struct lwp *lp); |
| 88 | static void bsd4_release_curproc(struct lwp *lp); |
| 89 | static void bsd4_select_curproc(globaldata_t gd); |
| 90 | static void bsd4_setrunqueue(struct lwp *lp); |
| 91 | static void bsd4_schedulerclock(struct lwp *lp, sysclock_t period, |
| 92 | sysclock_t cpstamp); |
| 93 | static void bsd4_recalculate_estcpu(struct lwp *lp); |
| 94 | static void bsd4_resetpriority(struct lwp *lp); |
| 95 | static void bsd4_forking(struct lwp *plp, struct lwp *lp); |
| 96 | static void bsd4_exiting(struct lwp *lp, struct proc *); |
| 97 | static void bsd4_yield(struct lwp *lp); |
| 98 | |
| 99 | #ifdef SMP |
| 100 | static void need_user_resched_remote(void *dummy); |
| 101 | static int batchy_looser_pri_test(struct lwp* lp); |
| 102 | static struct lwp *chooseproc_locked_cache_coherent(struct lwp *chklp); |
| 103 | #endif |
| 104 | static struct lwp *chooseproc_locked(struct lwp *chklp); |
| 105 | static void bsd4_remrunqueue_locked(struct lwp *lp); |
| 106 | static void bsd4_setrunqueue_locked(struct lwp *lp); |
| 107 | |
| 108 | struct usched usched_bsd4 = { |
| 109 | { NULL }, |
| 110 | "bsd4", "Original DragonFly Scheduler", |
| 111 | NULL, /* default registration */ |
| 112 | NULL, /* default deregistration */ |
| 113 | bsd4_acquire_curproc, |
| 114 | bsd4_release_curproc, |
| 115 | bsd4_setrunqueue, |
| 116 | bsd4_schedulerclock, |
| 117 | bsd4_recalculate_estcpu, |
| 118 | bsd4_resetpriority, |
| 119 | bsd4_forking, |
| 120 | bsd4_exiting, |
| 121 | NULL, /* setcpumask not supported */ |
| 122 | bsd4_yield |
| 123 | }; |
| 124 | |
| 125 | struct usched_bsd4_pcpu { |
| 126 | struct thread helper_thread; |
| 127 | short rrcount; |
| 128 | short upri; |
| 129 | struct lwp *uschedcp; |
| 130 | struct lwp *old_uschedcp; |
| 131 | #ifdef SMP |
| 132 | cpu_node_t *cpunode; |
| 133 | #endif |
| 134 | }; |
| 135 | |
| 136 | typedef struct usched_bsd4_pcpu *bsd4_pcpu_t; |
| 137 | |
| 138 | /* |
| 139 | * We have NQS (32) run queues per scheduling class. For the normal |
| 140 | * class, there are 128 priorities scaled onto these 32 queues. New |
| 141 | * processes are added to the last entry in each queue, and processes |
| 142 | * are selected for running by taking them from the head and maintaining |
| 143 | * a simple FIFO arrangement. Realtime and Idle priority processes have |
| 144 | * and explicit 0-31 priority which maps directly onto their class queue |
| 145 | * index. When a queue has something in it, the corresponding bit is |
| 146 | * set in the queuebits variable, allowing a single read to determine |
| 147 | * the state of all 32 queues and then a ffs() to find the first busy |
| 148 | * queue. |
| 149 | */ |
| 150 | static struct rq bsd4_queues[NQS]; |
| 151 | static struct rq bsd4_rtqueues[NQS]; |
| 152 | static struct rq bsd4_idqueues[NQS]; |
| 153 | static u_int32_t bsd4_queuebits; |
| 154 | static u_int32_t bsd4_rtqueuebits; |
| 155 | static u_int32_t bsd4_idqueuebits; |
| 156 | static cpumask_t bsd4_curprocmask = -1; /* currently running a user process */ |
| 157 | static cpumask_t bsd4_rdyprocmask; /* ready to accept a user process */ |
| 158 | static int bsd4_runqcount; |
| 159 | #ifdef SMP |
| 160 | static volatile int bsd4_scancpu; |
| 161 | #endif |
| 162 | static struct spinlock bsd4_spin; |
| 163 | static struct usched_bsd4_pcpu bsd4_pcpu[MAXCPU]; |
| 164 | static struct sysctl_ctx_list usched_bsd4_sysctl_ctx; |
| 165 | static struct sysctl_oid *usched_bsd4_sysctl_tree; |
| 166 | |
| 167 | /* Debug info exposed through debug.* sysctl */ |
| 168 | |
| 169 | SYSCTL_INT(_debug, OID_AUTO, bsd4_runqcount, CTLFLAG_RD, &bsd4_runqcount, 0, |
| 170 | "Number of run queues"); |
| 171 | #ifdef INVARIANTS |
| 172 | static int usched_nonoptimal; |
| 173 | SYSCTL_INT(_debug, OID_AUTO, usched_nonoptimal, CTLFLAG_RW, |
| 174 | &usched_nonoptimal, 0, "acquire_curproc() was not optimal"); |
| 175 | static int usched_optimal; |
| 176 | SYSCTL_INT(_debug, OID_AUTO, usched_optimal, CTLFLAG_RW, |
| 177 | &usched_optimal, 0, "acquire_curproc() was optimal"); |
| 178 | #endif |
| 179 | |
| 180 | static int usched_bsd4_debug = -1; |
| 181 | SYSCTL_INT(_debug, OID_AUTO, scdebug, CTLFLAG_RW, &usched_bsd4_debug, 0, |
| 182 | "Print debug information for this pid"); |
| 183 | static int usched_bsd4_pid_debug = -1; |
| 184 | SYSCTL_INT(_debug, OID_AUTO, pid_debug, CTLFLAG_RW, &usched_bsd4_pid_debug, 0, |
| 185 | "Print KTR debug information for this pid"); |
| 186 | |
| 187 | #ifdef SMP |
| 188 | static int remote_resched_nonaffinity; |
| 189 | static int remote_resched_affinity; |
| 190 | static int choose_affinity; |
| 191 | SYSCTL_INT(_debug, OID_AUTO, remote_resched_nonaffinity, CTLFLAG_RD, |
| 192 | &remote_resched_nonaffinity, 0, "Number of remote rescheds"); |
| 193 | SYSCTL_INT(_debug, OID_AUTO, remote_resched_affinity, CTLFLAG_RD, |
| 194 | &remote_resched_affinity, 0, "Number of remote rescheds"); |
| 195 | SYSCTL_INT(_debug, OID_AUTO, choose_affinity, CTLFLAG_RD, |
| 196 | &choose_affinity, 0, "chooseproc() was smart"); |
| 197 | #endif |
| 198 | |
| 199 | |
| 200 | /* Tunning usched_bsd4 - configurable through kern.usched_bsd4.* */ |
| 201 | #ifdef SMP |
| 202 | static int usched_bsd4_smt = 0; |
| 203 | static int usched_bsd4_cache_coherent = 0; |
| 204 | static int usched_bsd4_upri_affinity = 16; /* 32 queues - half-way */ |
| 205 | static int usched_bsd4_queue_checks = 5; |
| 206 | static int usched_bsd4_stick_to_level = 0; |
| 207 | #endif |
| 208 | static int usched_bsd4_rrinterval = (ESTCPUFREQ + 9) / 10; |
| 209 | static int usched_bsd4_decay = 8; |
| 210 | static int usched_bsd4_batch_time = 10; |
| 211 | |
| 212 | /* KTR debug printings */ |
| 213 | |
| 214 | KTR_INFO_MASTER(usched); |
| 215 | |
| 216 | #if !defined(KTR_USCHED_BSD4) |
| 217 | #define KTR_USCHED_BSD4 KTR_ALL |
| 218 | #endif |
| 219 | |
| 220 | KTR_INFO(KTR_USCHED_BSD4, usched, bsd4_acquire_curproc_urw, 0, |
| 221 | "USCHED_BSD4(bsd4_acquire_curproc in user_reseched_wanted " |
| 222 | "after release: pid %d, cpuid %d, curr_cpuid %d)", |
| 223 | pid_t pid, int cpuid, int curr); |
| 224 | KTR_INFO(KTR_USCHED_BSD4, usched, bsd4_acquire_curproc_before_loop, 0, |
| 225 | "USCHED_BSD4(bsd4_acquire_curproc before loop: pid %d, cpuid %d, " |
| 226 | "curr_cpuid %d)", |
| 227 | pid_t pid, int cpuid, int curr); |
| 228 | KTR_INFO(KTR_USCHED_BSD4, usched, bsd4_acquire_curproc_not, 0, |
| 229 | "USCHED_BSD4(bsd4_acquire_curproc couldn't acquire after " |
| 230 | "bsd4_setrunqueue: pid %d, cpuid %d, curr_lp pid %d, curr_cpuid %d)", |
| 231 | pid_t pid, int cpuid, pid_t curr_pid, int curr_cpuid); |
| 232 | KTR_INFO(KTR_USCHED_BSD4, usched, bsd4_acquire_curproc_switch, 0, |
| 233 | "USCHED_BSD4(bsd4_acquire_curproc after lwkt_switch: pid %d, " |
| 234 | "cpuid %d, curr_cpuid %d)", |
| 235 | pid_t pid, int cpuid, int curr); |
| 236 | |
| 237 | KTR_INFO(KTR_USCHED_BSD4, usched, bsd4_release_curproc, 0, |
| 238 | "USCHED_BSD4(bsd4_release_curproc before select: pid %d, " |
| 239 | "cpuid %d, curr_cpuid %d)", |
| 240 | pid_t pid, int cpuid, int curr); |
| 241 | |
| 242 | KTR_INFO(KTR_USCHED_BSD4, usched, bsd4_select_curproc, 0, |
| 243 | "USCHED_BSD4(bsd4_release_curproc before select: pid %d, " |
| 244 | "cpuid %d, old_pid %d, old_cpuid %d, curr_cpuid %d)", |
| 245 | pid_t pid, int cpuid, pid_t old_pid, int old_cpuid, int curr); |
| 246 | |
| 247 | #ifdef SMP |
| 248 | KTR_INFO(KTR_USCHED_BSD4, usched, batchy_test_false, 0, |
| 249 | "USCHED_BSD4(batchy_looser_pri_test false: pid %d, " |
| 250 | "cpuid %d, verify_mask %lu)", |
| 251 | pid_t pid, int cpuid, cpumask_t mask); |
| 252 | KTR_INFO(KTR_USCHED_BSD4, usched, batchy_test_true, 0, |
| 253 | "USCHED_BSD4(batchy_looser_pri_test true: pid %d, " |
| 254 | "cpuid %d, verify_mask %lu)", |
| 255 | pid_t pid, int cpuid, cpumask_t mask); |
| 256 | |
| 257 | KTR_INFO(KTR_USCHED_BSD4, usched, bsd4_setrunqueue_fc_smt, 0, |
| 258 | "USCHED_BSD4(bsd4_setrunqueue free cpus smt: pid %d, cpuid %d, " |
| 259 | "mask %lu, curr_cpuid %d)", |
| 260 | pid_t pid, int cpuid, cpumask_t mask, int curr); |
| 261 | KTR_INFO(KTR_USCHED_BSD4, usched, bsd4_setrunqueue_fc_non_smt, 0, |
| 262 | "USCHED_BSD4(bsd4_setrunqueue free cpus check non_smt: pid %d, " |
| 263 | "cpuid %d, mask %lu, curr_cpuid %d)", |
| 264 | pid_t pid, int cpuid, cpumask_t mask, int curr); |
| 265 | KTR_INFO(KTR_USCHED_BSD4, usched, bsd4_setrunqueue_rc, 0, |
| 266 | "USCHED_BSD4(bsd4_setrunqueue running cpus check: pid %d, " |
| 267 | "cpuid %d, mask %lu, curr_cpuid %d)", |
| 268 | pid_t pid, int cpuid, cpumask_t mask, int curr); |
| 269 | KTR_INFO(KTR_USCHED_BSD4, usched, bsd4_setrunqueue_found, 0, |
| 270 | "USCHED_BSD4(bsd4_setrunqueue found cpu: pid %d, cpuid %d, " |
| 271 | "mask %lu, found_cpuid %d, curr_cpuid %d)", |
| 272 | pid_t pid, int cpuid, cpumask_t mask, int found_cpuid, int curr); |
| 273 | KTR_INFO(KTR_USCHED_BSD4, usched, bsd4_setrunqueue_not_found, 0, |
| 274 | "USCHED_BSD4(bsd4_setrunqueue not found cpu: pid %d, cpuid %d, " |
| 275 | "try_cpuid %d, curr_cpuid %d)", |
| 276 | pid_t pid, int cpuid, int try_cpuid, int curr); |
| 277 | KTR_INFO(KTR_USCHED_BSD4, usched, bsd4_setrunqueue_found_best_cpuid, 0, |
| 278 | "USCHED_BSD4(bsd4_setrunqueue found cpu: pid %d, cpuid %d, " |
| 279 | "mask %lu, found_cpuid %d, curr_cpuid %d)", |
| 280 | pid_t pid, int cpuid, cpumask_t mask, int found_cpuid, int curr); |
| 281 | #endif |
| 282 | |
| 283 | KTR_INFO(KTR_USCHED_BSD4, usched, chooseproc, 0, |
| 284 | "USCHED_BSD4(chooseproc: pid %d, old_cpuid %d, curr_cpuid %d)", |
| 285 | pid_t pid, int old_cpuid, int curr); |
| 286 | #ifdef SMP |
| 287 | KTR_INFO(KTR_USCHED_BSD4, usched, chooseproc_cc, 0, |
| 288 | "USCHED_BSD4(chooseproc_cc: pid %d, old_cpuid %d, curr_cpuid %d)", |
| 289 | pid_t pid, int old_cpuid, int curr); |
| 290 | KTR_INFO(KTR_USCHED_BSD4, usched, chooseproc_cc_not_good, 0, |
| 291 | "USCHED_BSD4(chooseproc_cc not good: pid %d, old_cpumask %lu, " |
| 292 | "sibling_mask %lu, curr_cpumask %lu)", |
| 293 | pid_t pid, cpumask_t old_cpumask, cpumask_t sibling_mask, cpumask_t curr); |
| 294 | KTR_INFO(KTR_USCHED_BSD4, usched, chooseproc_cc_elected, 0, |
| 295 | "USCHED_BSD4(chooseproc_cc elected: pid %d, old_cpumask %lu, " |
| 296 | "sibling_mask %lu, curr_cpumask: %lu)", |
| 297 | pid_t pid, cpumask_t old_cpumask, cpumask_t sibling_mask, cpumask_t curr); |
| 298 | |
| 299 | KTR_INFO(KTR_USCHED_BSD4, usched, sched_thread_no_process, 0, |
| 300 | "USCHED_BSD4(sched_thread %d no process scheduled: pid %d, old_cpuid %d)", |
| 301 | int id, pid_t pid, int cpuid); |
| 302 | KTR_INFO(KTR_USCHED_BSD4, usched, sched_thread_process, 0, |
| 303 | "USCHED_BSD4(sched_thread %d process scheduled: pid %d, old_cpuid %d)", |
| 304 | int id, pid_t pid, int cpuid); |
| 305 | KTR_INFO(KTR_USCHED_BSD4, usched, sched_thread_no_process_found, 0, |
| 306 | "USCHED_BSD4(sched_thread %d no process found; tmpmask %lu)", |
| 307 | int id, cpumask_t tmpmask); |
| 308 | #endif |
| 309 | |
| 310 | /* |
| 311 | * Initialize the run queues at boot time. |
| 312 | */ |
| 313 | static void |
| 314 | rqinit(void *dummy) |
| 315 | { |
| 316 | int i; |
| 317 | |
| 318 | spin_init(&bsd4_spin); |
| 319 | for (i = 0; i < NQS; i++) { |
| 320 | TAILQ_INIT(&bsd4_queues[i]); |
| 321 | TAILQ_INIT(&bsd4_rtqueues[i]); |
| 322 | TAILQ_INIT(&bsd4_idqueues[i]); |
| 323 | } |
| 324 | atomic_clear_cpumask(&bsd4_curprocmask, 1); |
| 325 | } |
| 326 | SYSINIT(runqueue, SI_BOOT2_USCHED, SI_ORDER_FIRST, rqinit, NULL) |
| 327 | |
| 328 | /* |
| 329 | * BSD4_ACQUIRE_CURPROC |
| 330 | * |
| 331 | * This function is called when the kernel intends to return to userland. |
| 332 | * It is responsible for making the thread the current designated userland |
| 333 | * thread for this cpu, blocking if necessary. |
| 334 | * |
| 335 | * The kernel has already depressed our LWKT priority so we must not switch |
| 336 | * until we have either assigned or disposed of the thread. |
| 337 | * |
| 338 | * WARNING! THIS FUNCTION IS ALLOWED TO CAUSE THE CURRENT THREAD TO MIGRATE |
| 339 | * TO ANOTHER CPU! Because most of the kernel assumes that no migration will |
| 340 | * occur, this function is called only under very controlled circumstances. |
| 341 | * |
| 342 | * MPSAFE |
| 343 | */ |
| 344 | static void |
| 345 | bsd4_acquire_curproc(struct lwp *lp) |
| 346 | { |
| 347 | globaldata_t gd; |
| 348 | bsd4_pcpu_t dd; |
| 349 | thread_t td; |
| 350 | #if 0 |
| 351 | struct lwp *olp; |
| 352 | #endif |
| 353 | |
| 354 | /* |
| 355 | * Make sure we aren't sitting on a tsleep queue. |
| 356 | */ |
| 357 | td = lp->lwp_thread; |
| 358 | crit_enter_quick(td); |
| 359 | if (td->td_flags & TDF_TSLEEPQ) |
| 360 | tsleep_remove(td); |
| 361 | bsd4_recalculate_estcpu(lp); |
| 362 | |
| 363 | /* |
| 364 | * If a reschedule was requested give another thread the |
| 365 | * driver's seat. |
| 366 | */ |
| 367 | if (user_resched_wanted()) { |
| 368 | clear_user_resched(); |
| 369 | bsd4_release_curproc(lp); |
| 370 | |
| 371 | KTR_COND_LOG(usched_bsd4_acquire_curproc_urw, |
| 372 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 373 | lp->lwp_proc->p_pid, |
| 374 | lp->lwp_thread->td_gd->gd_cpuid, |
| 375 | mycpu->gd_cpuid); |
| 376 | } |
| 377 | |
| 378 | /* |
| 379 | * Loop until we are the current user thread |
| 380 | */ |
| 381 | gd = mycpu; |
| 382 | dd = &bsd4_pcpu[gd->gd_cpuid]; |
| 383 | |
| 384 | KTR_COND_LOG(usched_bsd4_acquire_curproc_before_loop, |
| 385 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 386 | lp->lwp_proc->p_pid, |
| 387 | lp->lwp_thread->td_gd->gd_cpuid, |
| 388 | gd->gd_cpuid); |
| 389 | |
| 390 | do { |
| 391 | /* |
| 392 | * Process any pending events and higher priority threads. |
| 393 | */ |
| 394 | lwkt_yield(); |
| 395 | |
| 396 | /* |
| 397 | * Become the currently scheduled user thread for this cpu |
| 398 | * if we can do so trivially. |
| 399 | * |
| 400 | * We can steal another thread's current thread designation |
| 401 | * on this cpu since if we are running that other thread |
| 402 | * must not be, so we can safely deschedule it. |
| 403 | */ |
| 404 | if (dd->uschedcp == lp) { |
| 405 | /* |
| 406 | * We are already the current lwp (hot path). |
| 407 | */ |
| 408 | dd->upri = lp->lwp_priority; |
| 409 | } else if (dd->uschedcp == NULL) { |
| 410 | /* |
| 411 | * We can trivially become the current lwp. |
| 412 | */ |
| 413 | atomic_set_cpumask(&bsd4_curprocmask, gd->gd_cpumask); |
| 414 | dd->uschedcp = lp; |
| 415 | dd->upri = lp->lwp_priority; |
| 416 | } else if (dd->upri > lp->lwp_priority) { |
| 417 | /* |
| 418 | * We can steal the current cpu's lwp designation |
| 419 | * away simply by replacing it. The other thread |
| 420 | * will stall when it tries to return to userland. |
| 421 | */ |
| 422 | dd->uschedcp = lp; |
| 423 | dd->upri = lp->lwp_priority; |
| 424 | /* |
| 425 | lwkt_deschedule(olp->lwp_thread); |
| 426 | bsd4_setrunqueue(olp); |
| 427 | */ |
| 428 | } else { |
| 429 | /* |
| 430 | * We cannot become the current lwp, place the lp |
| 431 | * on the bsd4 run-queue and deschedule ourselves. |
| 432 | * |
| 433 | * When we are reactivated we will have another |
| 434 | * chance. |
| 435 | */ |
| 436 | lwkt_deschedule(lp->lwp_thread); |
| 437 | |
| 438 | bsd4_setrunqueue(lp); |
| 439 | |
| 440 | KTR_COND_LOG(usched_bsd4_acquire_curproc_not, |
| 441 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 442 | lp->lwp_proc->p_pid, |
| 443 | lp->lwp_thread->td_gd->gd_cpuid, |
| 444 | dd->uschedcp->lwp_proc->p_pid, |
| 445 | gd->gd_cpuid); |
| 446 | |
| 447 | |
| 448 | lwkt_switch(); |
| 449 | |
| 450 | /* |
| 451 | * Reload after a switch or setrunqueue/switch possibly |
| 452 | * moved us to another cpu. |
| 453 | */ |
| 454 | gd = mycpu; |
| 455 | dd = &bsd4_pcpu[gd->gd_cpuid]; |
| 456 | |
| 457 | KTR_COND_LOG(usched_bsd4_acquire_curproc_switch, |
| 458 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 459 | lp->lwp_proc->p_pid, |
| 460 | lp->lwp_thread->td_gd->gd_cpuid, |
| 461 | gd->gd_cpuid); |
| 462 | } |
| 463 | } while (dd->uschedcp != lp); |
| 464 | |
| 465 | crit_exit_quick(td); |
| 466 | KKASSERT((lp->lwp_mpflags & LWP_MP_ONRUNQ) == 0); |
| 467 | } |
| 468 | |
| 469 | /* |
| 470 | * BSD4_RELEASE_CURPROC |
| 471 | * |
| 472 | * This routine detaches the current thread from the userland scheduler, |
| 473 | * usually because the thread needs to run or block in the kernel (at |
| 474 | * kernel priority) for a while. |
| 475 | * |
| 476 | * This routine is also responsible for selecting a new thread to |
| 477 | * make the current thread. |
| 478 | * |
| 479 | * NOTE: This implementation differs from the dummy example in that |
| 480 | * bsd4_select_curproc() is able to select the current process, whereas |
| 481 | * dummy_select_curproc() is not able to select the current process. |
| 482 | * This means we have to NULL out uschedcp. |
| 483 | * |
| 484 | * Additionally, note that we may already be on a run queue if releasing |
| 485 | * via the lwkt_switch() in bsd4_setrunqueue(). |
| 486 | * |
| 487 | * MPSAFE |
| 488 | */ |
| 489 | |
| 490 | static void |
| 491 | bsd4_release_curproc(struct lwp *lp) |
| 492 | { |
| 493 | globaldata_t gd = mycpu; |
| 494 | bsd4_pcpu_t dd = &bsd4_pcpu[gd->gd_cpuid]; |
| 495 | |
| 496 | if (dd->uschedcp == lp) { |
| 497 | crit_enter(); |
| 498 | KKASSERT((lp->lwp_mpflags & LWP_MP_ONRUNQ) == 0); |
| 499 | |
| 500 | KTR_COND_LOG(usched_bsd4_release_curproc, |
| 501 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 502 | lp->lwp_proc->p_pid, |
| 503 | lp->lwp_thread->td_gd->gd_cpuid, |
| 504 | gd->gd_cpuid); |
| 505 | |
| 506 | dd->uschedcp = NULL; /* don't let lp be selected */ |
| 507 | dd->upri = PRIBASE_NULL; |
| 508 | atomic_clear_cpumask(&bsd4_curprocmask, gd->gd_cpumask); |
| 509 | dd->old_uschedcp = lp; /* used only for KTR debug prints */ |
| 510 | bsd4_select_curproc(gd); |
| 511 | crit_exit(); |
| 512 | } |
| 513 | } |
| 514 | |
| 515 | /* |
| 516 | * BSD4_SELECT_CURPROC |
| 517 | * |
| 518 | * Select a new current process for this cpu and clear any pending user |
| 519 | * reschedule request. The cpu currently has no current process. |
| 520 | * |
| 521 | * This routine is also responsible for equal-priority round-robining, |
| 522 | * typically triggered from bsd4_schedulerclock(). In our dummy example |
| 523 | * all the 'user' threads are LWKT scheduled all at once and we just |
| 524 | * call lwkt_switch(). |
| 525 | * |
| 526 | * The calling process is not on the queue and cannot be selected. |
| 527 | * |
| 528 | * MPSAFE |
| 529 | */ |
| 530 | static |
| 531 | void |
| 532 | bsd4_select_curproc(globaldata_t gd) |
| 533 | { |
| 534 | bsd4_pcpu_t dd = &bsd4_pcpu[gd->gd_cpuid]; |
| 535 | struct lwp *nlp; |
| 536 | int cpuid = gd->gd_cpuid; |
| 537 | |
| 538 | crit_enter_gd(gd); |
| 539 | |
| 540 | spin_lock(&bsd4_spin); |
| 541 | #ifdef SMP |
| 542 | if(usched_bsd4_cache_coherent) |
| 543 | nlp = chooseproc_locked_cache_coherent(dd->uschedcp); |
| 544 | else |
| 545 | #endif |
| 546 | nlp = chooseproc_locked(dd->uschedcp); |
| 547 | |
| 548 | if (nlp) { |
| 549 | |
| 550 | KTR_COND_LOG(usched_bsd4_select_curproc, |
| 551 | nlp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 552 | nlp->lwp_proc->p_pid, |
| 553 | nlp->lwp_thread->td_gd->gd_cpuid, |
| 554 | dd->old_uschedcp->lwp_proc->p_pid, |
| 555 | dd->old_uschedcp->lwp_thread->td_gd->gd_cpuid, |
| 556 | gd->gd_cpuid); |
| 557 | |
| 558 | atomic_set_cpumask(&bsd4_curprocmask, CPUMASK(cpuid)); |
| 559 | dd->upri = nlp->lwp_priority; |
| 560 | dd->uschedcp = nlp; |
| 561 | spin_unlock(&bsd4_spin); |
| 562 | #ifdef SMP |
| 563 | lwkt_acquire(nlp->lwp_thread); |
| 564 | #endif |
| 565 | lwkt_schedule(nlp->lwp_thread); |
| 566 | } else { |
| 567 | spin_unlock(&bsd4_spin); |
| 568 | } |
| 569 | |
| 570 | #if 0 |
| 571 | } else if (bsd4_runqcount && (bsd4_rdyprocmask & CPUMASK(cpuid))) { |
| 572 | atomic_clear_cpumask(&bsd4_rdyprocmask, CPUMASK(cpuid)); |
| 573 | spin_unlock(&bsd4_spin); |
| 574 | lwkt_schedule(&dd->helper_thread); |
| 575 | } else { |
| 576 | spin_unlock(&bsd4_spin); |
| 577 | } |
| 578 | #endif |
| 579 | crit_exit_gd(gd); |
| 580 | } |
| 581 | #ifdef SMP |
| 582 | |
| 583 | /* |
| 584 | * batchy_looser_pri_test() - determine if a process is batchy or not |
| 585 | * relative to the other processes running in the system |
| 586 | */ |
| 587 | static int |
| 588 | batchy_looser_pri_test(struct lwp* lp) |
| 589 | { |
| 590 | cpumask_t mask; |
| 591 | bsd4_pcpu_t other_dd; |
| 592 | int cpu; |
| 593 | |
| 594 | /* Current running processes */ |
| 595 | mask = bsd4_curprocmask & smp_active_mask |
| 596 | & usched_global_cpumask; |
| 597 | |
| 598 | while(mask) { |
| 599 | cpu = BSFCPUMASK(mask); |
| 600 | other_dd = &bsd4_pcpu[cpu]; |
| 601 | if (other_dd->upri - lp->lwp_priority > usched_bsd4_upri_affinity * PPQ) { |
| 602 | |
| 603 | KTR_COND_LOG(usched_batchy_test_false, |
| 604 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 605 | lp->lwp_proc->p_pid, |
| 606 | lp->lwp_thread->td_gd->gd_cpuid, |
| 607 | mask); |
| 608 | |
| 609 | return 0; |
| 610 | } |
| 611 | mask &= ~CPUMASK(cpu); |
| 612 | } |
| 613 | |
| 614 | KTR_COND_LOG(usched_batchy_test_true, |
| 615 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 616 | lp->lwp_proc->p_pid, |
| 617 | lp->lwp_thread->td_gd->gd_cpuid, |
| 618 | mask); |
| 619 | |
| 620 | return 1; |
| 621 | } |
| 622 | |
| 623 | #endif |
| 624 | /* |
| 625 | * |
| 626 | * BSD4_SETRUNQUEUE |
| 627 | * |
| 628 | * Place the specified lwp on the user scheduler's run queue. This routine |
| 629 | * must be called with the thread descheduled. The lwp must be runnable. |
| 630 | * |
| 631 | * The thread may be the current thread as a special case. |
| 632 | * |
| 633 | * MPSAFE |
| 634 | */ |
| 635 | static void |
| 636 | bsd4_setrunqueue(struct lwp *lp) |
| 637 | { |
| 638 | globaldata_t gd; |
| 639 | bsd4_pcpu_t dd; |
| 640 | #ifdef SMP |
| 641 | int cpuid; |
| 642 | cpumask_t mask; |
| 643 | cpumask_t tmpmask; |
| 644 | #endif |
| 645 | |
| 646 | /* |
| 647 | * First validate the process state relative to the current cpu. |
| 648 | * We don't need the spinlock for this, just a critical section. |
| 649 | * We are in control of the process. |
| 650 | */ |
| 651 | crit_enter(); |
| 652 | KASSERT(lp->lwp_stat == LSRUN, ("setrunqueue: lwp not LSRUN")); |
| 653 | KASSERT((lp->lwp_mpflags & LWP_MP_ONRUNQ) == 0, |
| 654 | ("lwp %d/%d already on runq! flag %08x/%08x", lp->lwp_proc->p_pid, |
| 655 | lp->lwp_tid, lp->lwp_proc->p_flags, lp->lwp_flags)); |
| 656 | KKASSERT((lp->lwp_thread->td_flags & TDF_RUNQ) == 0); |
| 657 | |
| 658 | /* |
| 659 | * Note: gd and dd are relative to the target thread's last cpu, |
| 660 | * NOT our current cpu. |
| 661 | */ |
| 662 | gd = lp->lwp_thread->td_gd; |
| 663 | dd = &bsd4_pcpu[gd->gd_cpuid]; |
| 664 | |
| 665 | /* |
| 666 | * This process is not supposed to be scheduled anywhere or assigned |
| 667 | * as the current process anywhere. Assert the condition. |
| 668 | */ |
| 669 | KKASSERT(dd->uschedcp != lp); |
| 670 | |
| 671 | #ifndef SMP |
| 672 | /* |
| 673 | * If we are not SMP we do not have a scheduler helper to kick |
| 674 | * and must directly activate the process if none are scheduled. |
| 675 | * |
| 676 | * This is really only an issue when bootstrapping init since |
| 677 | * the caller in all other cases will be a user process, and |
| 678 | * even if released (dd->uschedcp == NULL), that process will |
| 679 | * kickstart the scheduler when it returns to user mode from |
| 680 | * the kernel. |
| 681 | */ |
| 682 | if (dd->uschedcp == NULL) { |
| 683 | atomic_set_cpumask(&bsd4_curprocmask, gd->gd_cpumask); |
| 684 | dd->uschedcp = lp; |
| 685 | dd->upri = lp->lwp_priority; |
| 686 | lwkt_schedule(lp->lwp_thread); |
| 687 | crit_exit(); |
| 688 | return; |
| 689 | } |
| 690 | #endif |
| 691 | |
| 692 | #ifdef SMP |
| 693 | /* |
| 694 | * XXX fixme. Could be part of a remrunqueue/setrunqueue |
| 695 | * operation when the priority is recalculated, so TDF_MIGRATING |
| 696 | * may already be set. |
| 697 | */ |
| 698 | if ((lp->lwp_thread->td_flags & TDF_MIGRATING) == 0) |
| 699 | lwkt_giveaway(lp->lwp_thread); |
| 700 | #endif |
| 701 | |
| 702 | /* |
| 703 | * We lose control of lp the moment we release the spinlock after |
| 704 | * having placed lp on the queue. i.e. another cpu could pick it |
| 705 | * up and it could exit, or its priority could be further adjusted, |
| 706 | * or something like that. |
| 707 | */ |
| 708 | spin_lock(&bsd4_spin); |
| 709 | bsd4_setrunqueue_locked(lp); |
| 710 | lp->lwp_setrunqueue_ticks = sched_ticks; |
| 711 | |
| 712 | #ifdef SMP |
| 713 | /* |
| 714 | * Kick the scheduler helper on one of the other cpu's |
| 715 | * and request a reschedule if appropriate. |
| 716 | * |
| 717 | * NOTE: We check all cpus whos rdyprocmask is set. First we |
| 718 | * look for cpus without designated lps, then we look for |
| 719 | * cpus with designated lps with a worse priority than our |
| 720 | * process. |
| 721 | */ |
| 722 | ++bsd4_scancpu; |
| 723 | |
| 724 | if(usched_bsd4_smt) { |
| 725 | |
| 726 | /* |
| 727 | * SMT heuristic - Try to schedule on a free physical core. If no physical core |
| 728 | * found than choose the one that has an interactive thread |
| 729 | */ |
| 730 | |
| 731 | int best_cpuid = -1; |
| 732 | int min_prio = MAXPRI * MAXPRI; |
| 733 | int sibling; |
| 734 | |
| 735 | cpuid = (bsd4_scancpu & 0xFFFF) % ncpus; |
| 736 | mask = ~bsd4_curprocmask & bsd4_rdyprocmask & lp->lwp_cpumask & |
| 737 | smp_active_mask & usched_global_cpumask; |
| 738 | |
| 739 | KTR_COND_LOG(usched_bsd4_setrunqueue_fc_smt, |
| 740 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 741 | lp->lwp_proc->p_pid, |
| 742 | lp->lwp_thread->td_gd->gd_cpuid, |
| 743 | mask, |
| 744 | mycpu->gd_cpuid); |
| 745 | |
| 746 | while (mask) { |
| 747 | tmpmask = ~(CPUMASK(cpuid) - 1); |
| 748 | if (mask & tmpmask) |
| 749 | cpuid = BSFCPUMASK(mask & tmpmask); |
| 750 | else |
| 751 | cpuid = BSFCPUMASK(mask); |
| 752 | gd = globaldata_find(cpuid); |
| 753 | dd = &bsd4_pcpu[cpuid]; |
| 754 | |
| 755 | if ((dd->upri & ~PPQMASK) >= (lp->lwp_priority & ~PPQMASK)) { |
| 756 | if (dd->cpunode->parent_node->members & ~dd->cpunode->members & mask) { |
| 757 | |
| 758 | KTR_COND_LOG(usched_bsd4_setrunqueue_found, |
| 759 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 760 | lp->lwp_proc->p_pid, |
| 761 | lp->lwp_thread->td_gd->gd_cpuid, |
| 762 | mask, |
| 763 | cpuid, |
| 764 | mycpu->gd_cpuid); |
| 765 | |
| 766 | goto found; |
| 767 | } else { |
| 768 | sibling = BSFCPUMASK(dd->cpunode->parent_node->members & |
| 769 | ~dd->cpunode->members); |
| 770 | if (min_prio > bsd4_pcpu[sibling].upri) { |
| 771 | min_prio = bsd4_pcpu[sibling].upri; |
| 772 | best_cpuid = cpuid; |
| 773 | } |
| 774 | } |
| 775 | } |
| 776 | mask &= ~CPUMASK(cpuid); |
| 777 | } |
| 778 | |
| 779 | if (best_cpuid != -1) { |
| 780 | cpuid = best_cpuid; |
| 781 | gd = globaldata_find(cpuid); |
| 782 | dd = &bsd4_pcpu[cpuid]; |
| 783 | |
| 784 | KTR_COND_LOG(usched_bsd4_setrunqueue_found_best_cpuid, |
| 785 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 786 | lp->lwp_proc->p_pid, |
| 787 | lp->lwp_thread->td_gd->gd_cpuid, |
| 788 | mask, |
| 789 | cpuid, |
| 790 | mycpu->gd_cpuid); |
| 791 | |
| 792 | goto found; |
| 793 | } |
| 794 | } else { |
| 795 | /* Fallback to the original heuristic */ |
| 796 | cpuid = (bsd4_scancpu & 0xFFFF) % ncpus; |
| 797 | mask = ~bsd4_curprocmask & bsd4_rdyprocmask & lp->lwp_cpumask & |
| 798 | smp_active_mask & usched_global_cpumask; |
| 799 | |
| 800 | KTR_COND_LOG(usched_bsd4_setrunqueue_fc_non_smt, |
| 801 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 802 | lp->lwp_proc->p_pid, |
| 803 | lp->lwp_thread->td_gd->gd_cpuid, |
| 804 | mask, |
| 805 | mycpu->gd_cpuid); |
| 806 | |
| 807 | while (mask) { |
| 808 | tmpmask = ~(CPUMASK(cpuid) - 1); |
| 809 | if (mask & tmpmask) |
| 810 | cpuid = BSFCPUMASK(mask & tmpmask); |
| 811 | else |
| 812 | cpuid = BSFCPUMASK(mask); |
| 813 | gd = globaldata_find(cpuid); |
| 814 | dd = &bsd4_pcpu[cpuid]; |
| 815 | |
| 816 | if ((dd->upri & ~PPQMASK) >= (lp->lwp_priority & ~PPQMASK)) { |
| 817 | |
| 818 | KTR_COND_LOG(usched_bsd4_setrunqueue_found, |
| 819 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 820 | lp->lwp_proc->p_pid, |
| 821 | lp->lwp_thread->td_gd->gd_cpuid, |
| 822 | mask, |
| 823 | cpuid, |
| 824 | mycpu->gd_cpuid); |
| 825 | |
| 826 | goto found; |
| 827 | } |
| 828 | mask &= ~CPUMASK(cpuid); |
| 829 | } |
| 830 | } |
| 831 | |
| 832 | /* |
| 833 | * Then cpus which might have a currently running lp |
| 834 | */ |
| 835 | mask = bsd4_curprocmask & bsd4_rdyprocmask & |
| 836 | lp->lwp_cpumask & smp_active_mask & usched_global_cpumask; |
| 837 | |
| 838 | KTR_COND_LOG(usched_bsd4_setrunqueue_rc, |
| 839 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 840 | lp->lwp_proc->p_pid, |
| 841 | lp->lwp_thread->td_gd->gd_cpuid, |
| 842 | mask, |
| 843 | mycpu->gd_cpuid); |
| 844 | |
| 845 | while (mask) { |
| 846 | tmpmask = ~(CPUMASK(cpuid) - 1); |
| 847 | if (mask & tmpmask) |
| 848 | cpuid = BSFCPUMASK(mask & tmpmask); |
| 849 | else |
| 850 | cpuid = BSFCPUMASK(mask); |
| 851 | gd = globaldata_find(cpuid); |
| 852 | dd = &bsd4_pcpu[cpuid]; |
| 853 | |
| 854 | if ((dd->upri & ~PPQMASK) > (lp->lwp_priority & ~PPQMASK)) { |
| 855 | |
| 856 | KTR_COND_LOG(usched_bsd4_setrunqueue_found, |
| 857 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 858 | lp->lwp_proc->p_pid, |
| 859 | lp->lwp_thread->td_gd->gd_cpuid, |
| 860 | mask, |
| 861 | cpuid, |
| 862 | mycpu->gd_cpuid); |
| 863 | |
| 864 | goto found; |
| 865 | } |
| 866 | mask &= ~CPUMASK(cpuid); |
| 867 | } |
| 868 | |
| 869 | /* |
| 870 | * If we cannot find a suitable cpu we reload from bsd4_scancpu |
| 871 | * and round-robin. Other cpus will pickup as they release their |
| 872 | * current lwps or become ready. |
| 873 | * |
| 874 | * Avoid a degenerate system lockup case if usched_global_cpumask |
| 875 | * is set to 0 or otherwise does not cover lwp_cpumask. |
| 876 | * |
| 877 | * We only kick the target helper thread in this case, we do not |
| 878 | * set the user resched flag because |
| 879 | */ |
| 880 | cpuid = (bsd4_scancpu & 0xFFFF) % ncpus; |
| 881 | if ((CPUMASK(cpuid) & usched_global_cpumask) == 0) { |
| 882 | cpuid = 0; |
| 883 | } |
| 884 | gd = globaldata_find(cpuid); |
| 885 | dd = &bsd4_pcpu[cpuid]; |
| 886 | |
| 887 | KTR_COND_LOG(usched_bsd4_setrunqueue_not_found, |
| 888 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 889 | lp->lwp_proc->p_pid, |
| 890 | lp->lwp_thread->td_gd->gd_cpuid, |
| 891 | cpuid, |
| 892 | mycpu->gd_cpuid); |
| 893 | |
| 894 | found: |
| 895 | if (gd == mycpu) { |
| 896 | spin_unlock(&bsd4_spin); |
| 897 | if ((dd->upri & ~PPQMASK) > (lp->lwp_priority & ~PPQMASK)) { |
| 898 | if (dd->uschedcp == NULL) { |
| 899 | wakeup(&dd->helper_thread); |
| 900 | } else { |
| 901 | need_user_resched(); |
| 902 | } |
| 903 | } |
| 904 | } else { |
| 905 | atomic_clear_cpumask(&bsd4_rdyprocmask, CPUMASK(cpuid)); |
| 906 | spin_unlock(&bsd4_spin); |
| 907 | if ((dd->upri & ~PPQMASK) > (lp->lwp_priority & ~PPQMASK)) |
| 908 | lwkt_send_ipiq(gd, need_user_resched_remote, NULL); |
| 909 | else |
| 910 | wakeup(&dd->helper_thread); |
| 911 | } |
| 912 | #else |
| 913 | /* |
| 914 | * Request a reschedule if appropriate. |
| 915 | */ |
| 916 | spin_unlock(&bsd4_spin); |
| 917 | if ((dd->upri & ~PPQMASK) > (lp->lwp_priority & ~PPQMASK)) { |
| 918 | need_user_resched(); |
| 919 | } |
| 920 | #endif |
| 921 | crit_exit(); |
| 922 | } |
| 923 | |
| 924 | /* |
| 925 | * This routine is called from a systimer IPI. It MUST be MP-safe and |
| 926 | * the BGL IS NOT HELD ON ENTRY. This routine is called at ESTCPUFREQ on |
| 927 | * each cpu. |
| 928 | * |
| 929 | * MPSAFE |
| 930 | */ |
| 931 | static |
| 932 | void |
| 933 | bsd4_schedulerclock(struct lwp *lp, sysclock_t period, sysclock_t cpstamp) |
| 934 | { |
| 935 | globaldata_t gd = mycpu; |
| 936 | bsd4_pcpu_t dd = &bsd4_pcpu[gd->gd_cpuid]; |
| 937 | |
| 938 | /* |
| 939 | * Do we need to round-robin? We round-robin 10 times a second. |
| 940 | * This should only occur for cpu-bound batch processes. |
| 941 | */ |
| 942 | if (++dd->rrcount >= usched_bsd4_rrinterval) { |
| 943 | dd->rrcount = 0; |
| 944 | need_user_resched(); |
| 945 | } |
| 946 | |
| 947 | /* |
| 948 | * Adjust estcpu upward using a real time equivalent calculation. |
| 949 | */ |
| 950 | lp->lwp_estcpu = ESTCPULIM(lp->lwp_estcpu + ESTCPUMAX / ESTCPUFREQ + 1); |
| 951 | |
| 952 | /* |
| 953 | * Spinlocks also hold a critical section so there should not be |
| 954 | * any active. |
| 955 | */ |
| 956 | KKASSERT(gd->gd_spinlocks_wr == 0); |
| 957 | |
| 958 | bsd4_resetpriority(lp); |
| 959 | #if 0 |
| 960 | /* |
| 961 | * if we can't call bsd4_resetpriority for some reason we must call |
| 962 | * need user_resched(). |
| 963 | */ |
| 964 | need_user_resched(); |
| 965 | #endif |
| 966 | } |
| 967 | |
| 968 | /* |
| 969 | * Called from acquire and from kern_synch's one-second timer (one of the |
| 970 | * callout helper threads) with a critical section held. |
| 971 | * |
| 972 | * Decay p_estcpu based on the number of ticks we haven't been running |
| 973 | * and our p_nice. As the load increases each process observes a larger |
| 974 | * number of idle ticks (because other processes are running in them). |
| 975 | * This observation leads to a larger correction which tends to make the |
| 976 | * system more 'batchy'. |
| 977 | * |
| 978 | * Note that no recalculation occurs for a process which sleeps and wakes |
| 979 | * up in the same tick. That is, a system doing thousands of context |
| 980 | * switches per second will still only do serious estcpu calculations |
| 981 | * ESTCPUFREQ times per second. |
| 982 | * |
| 983 | * MPSAFE |
| 984 | */ |
| 985 | static |
| 986 | void |
| 987 | bsd4_recalculate_estcpu(struct lwp *lp) |
| 988 | { |
| 989 | globaldata_t gd = mycpu; |
| 990 | sysclock_t cpbase; |
| 991 | sysclock_t ttlticks; |
| 992 | int estcpu; |
| 993 | int decay_factor; |
| 994 | |
| 995 | /* |
| 996 | * We have to subtract periodic to get the last schedclock |
| 997 | * timeout time, otherwise we would get the upcoming timeout. |
| 998 | * Keep in mind that a process can migrate between cpus and |
| 999 | * while the scheduler clock should be very close, boundary |
| 1000 | * conditions could lead to a small negative delta. |
| 1001 | */ |
| 1002 | cpbase = gd->gd_schedclock.time - gd->gd_schedclock.periodic; |
| 1003 | |
| 1004 | if (lp->lwp_slptime > 1) { |
| 1005 | /* |
| 1006 | * Too much time has passed, do a coarse correction. |
| 1007 | */ |
| 1008 | lp->lwp_estcpu = lp->lwp_estcpu >> 1; |
| 1009 | bsd4_resetpriority(lp); |
| 1010 | lp->lwp_cpbase = cpbase; |
| 1011 | lp->lwp_cpticks = 0; |
| 1012 | lp->lwp_batch -= ESTCPUFREQ; |
| 1013 | if (lp->lwp_batch < 0) |
| 1014 | lp->lwp_batch = 0; |
| 1015 | } else if (lp->lwp_cpbase != cpbase) { |
| 1016 | /* |
| 1017 | * Adjust estcpu if we are in a different tick. Don't waste |
| 1018 | * time if we are in the same tick. |
| 1019 | * |
| 1020 | * First calculate the number of ticks in the measurement |
| 1021 | * interval. The ttlticks calculation can wind up 0 due to |
| 1022 | * a bug in the handling of lwp_slptime (as yet not found), |
| 1023 | * so make sure we do not get a divide by 0 panic. |
| 1024 | */ |
| 1025 | ttlticks = (cpbase - lp->lwp_cpbase) / |
| 1026 | gd->gd_schedclock.periodic; |
| 1027 | if (ttlticks < 0) { |
| 1028 | ttlticks = 0; |
| 1029 | lp->lwp_cpbase = cpbase; |
| 1030 | } |
| 1031 | if (ttlticks == 0) |
| 1032 | return; |
| 1033 | updatepcpu(lp, lp->lwp_cpticks, ttlticks); |
| 1034 | |
| 1035 | /* |
| 1036 | * Calculate the percentage of one cpu used factoring in ncpus |
| 1037 | * and the load and adjust estcpu. Handle degenerate cases |
| 1038 | * by adding 1 to bsd4_runqcount. |
| 1039 | * |
| 1040 | * estcpu is scaled by ESTCPUMAX. |
| 1041 | * |
| 1042 | * bsd4_runqcount is the excess number of user processes |
| 1043 | * that cannot be immediately scheduled to cpus. We want |
| 1044 | * to count these as running to avoid range compression |
| 1045 | * in the base calculation (which is the actual percentage |
| 1046 | * of one cpu used). |
| 1047 | */ |
| 1048 | estcpu = (lp->lwp_cpticks * ESTCPUMAX) * |
| 1049 | (bsd4_runqcount + ncpus) / (ncpus * ttlticks); |
| 1050 | |
| 1051 | /* |
| 1052 | * If estcpu is > 50% we become more batch-like |
| 1053 | * If estcpu is <= 50% we become less batch-like |
| 1054 | * |
| 1055 | * It takes 30 cpu seconds to traverse the entire range. |
| 1056 | */ |
| 1057 | if (estcpu > ESTCPUMAX / 2) { |
| 1058 | lp->lwp_batch += ttlticks; |
| 1059 | if (lp->lwp_batch > BATCHMAX) |
| 1060 | lp->lwp_batch = BATCHMAX; |
| 1061 | } else { |
| 1062 | lp->lwp_batch -= ttlticks; |
| 1063 | if (lp->lwp_batch < 0) |
| 1064 | lp->lwp_batch = 0; |
| 1065 | } |
| 1066 | |
| 1067 | if (usched_bsd4_debug == lp->lwp_proc->p_pid) { |
| 1068 | kprintf("pid %d lwp %p estcpu %3d %3d bat %d cp %d/%d", |
| 1069 | lp->lwp_proc->p_pid, lp, |
| 1070 | estcpu, lp->lwp_estcpu, |
| 1071 | lp->lwp_batch, |
| 1072 | lp->lwp_cpticks, ttlticks); |
| 1073 | } |
| 1074 | |
| 1075 | /* |
| 1076 | * Adjust lp->lwp_esetcpu. The decay factor determines how |
| 1077 | * quickly lwp_estcpu collapses to its realtime calculation. |
| 1078 | * A slower collapse gives us a more accurate number but |
| 1079 | * can cause a cpu hog to eat too much cpu before the |
| 1080 | * scheduler decides to downgrade it. |
| 1081 | * |
| 1082 | * NOTE: p_nice is accounted for in bsd4_resetpriority(), |
| 1083 | * and not here, but we must still ensure that a |
| 1084 | * cpu-bound nice -20 process does not completely |
| 1085 | * override a cpu-bound nice +20 process. |
| 1086 | * |
| 1087 | * NOTE: We must use ESTCPULIM() here to deal with any |
| 1088 | * overshoot. |
| 1089 | */ |
| 1090 | decay_factor = usched_bsd4_decay; |
| 1091 | if (decay_factor < 1) |
| 1092 | decay_factor = 1; |
| 1093 | if (decay_factor > 1024) |
| 1094 | decay_factor = 1024; |
| 1095 | |
| 1096 | lp->lwp_estcpu = ESTCPULIM( |
| 1097 | (lp->lwp_estcpu * decay_factor + estcpu) / |
| 1098 | (decay_factor + 1)); |
| 1099 | |
| 1100 | if (usched_bsd4_debug == lp->lwp_proc->p_pid) |
| 1101 | kprintf(" finalestcpu %d\n", lp->lwp_estcpu); |
| 1102 | bsd4_resetpriority(lp); |
| 1103 | lp->lwp_cpbase += ttlticks * gd->gd_schedclock.periodic; |
| 1104 | lp->lwp_cpticks = 0; |
| 1105 | } |
| 1106 | } |
| 1107 | |
| 1108 | /* |
| 1109 | * Compute the priority of a process when running in user mode. |
| 1110 | * Arrange to reschedule if the resulting priority is better |
| 1111 | * than that of the current process. |
| 1112 | * |
| 1113 | * This routine may be called with any process. |
| 1114 | * |
| 1115 | * This routine is called by fork1() for initial setup with the process |
| 1116 | * of the run queue, and also may be called normally with the process on or |
| 1117 | * off the run queue. |
| 1118 | * |
| 1119 | * MPSAFE |
| 1120 | */ |
| 1121 | static void |
| 1122 | bsd4_resetpriority(struct lwp *lp) |
| 1123 | { |
| 1124 | bsd4_pcpu_t dd; |
| 1125 | int newpriority; |
| 1126 | u_short newrqtype; |
| 1127 | int reschedcpu; |
| 1128 | int checkpri; |
| 1129 | int estcpu; |
| 1130 | |
| 1131 | /* |
| 1132 | * Calculate the new priority and queue type |
| 1133 | */ |
| 1134 | crit_enter(); |
| 1135 | spin_lock(&bsd4_spin); |
| 1136 | |
| 1137 | newrqtype = lp->lwp_rtprio.type; |
| 1138 | |
| 1139 | switch(newrqtype) { |
| 1140 | case RTP_PRIO_REALTIME: |
| 1141 | case RTP_PRIO_FIFO: |
| 1142 | newpriority = PRIBASE_REALTIME + |
| 1143 | (lp->lwp_rtprio.prio & PRIMASK); |
| 1144 | break; |
| 1145 | case RTP_PRIO_NORMAL: |
| 1146 | /* |
| 1147 | * Detune estcpu based on batchiness. lwp_batch ranges |
| 1148 | * from 0 to BATCHMAX. Limit estcpu for the sake of |
| 1149 | * the priority calculation to between 50% and 100%. |
| 1150 | */ |
| 1151 | estcpu = lp->lwp_estcpu * (lp->lwp_batch + BATCHMAX) / |
| 1152 | (BATCHMAX * 2); |
| 1153 | |
| 1154 | /* |
| 1155 | * p_nice piece Adds (0-40) * 2 0-80 |
| 1156 | * estcpu Adds 16384 * 4 / 512 0-128 |
| 1157 | */ |
| 1158 | newpriority = (lp->lwp_proc->p_nice - PRIO_MIN) * PPQ / NICEPPQ; |
| 1159 | newpriority += estcpu * PPQ / ESTCPUPPQ; |
| 1160 | newpriority = newpriority * MAXPRI / (PRIO_RANGE * PPQ / |
| 1161 | NICEPPQ + ESTCPUMAX * PPQ / ESTCPUPPQ); |
| 1162 | newpriority = PRIBASE_NORMAL + (newpriority & PRIMASK); |
| 1163 | break; |
| 1164 | case RTP_PRIO_IDLE: |
| 1165 | newpriority = PRIBASE_IDLE + (lp->lwp_rtprio.prio & PRIMASK); |
| 1166 | break; |
| 1167 | case RTP_PRIO_THREAD: |
| 1168 | newpriority = PRIBASE_THREAD + (lp->lwp_rtprio.prio & PRIMASK); |
| 1169 | break; |
| 1170 | default: |
| 1171 | panic("Bad RTP_PRIO %d", newrqtype); |
| 1172 | /* NOT REACHED */ |
| 1173 | } |
| 1174 | |
| 1175 | /* |
| 1176 | * The newpriority incorporates the queue type so do a simple masked |
| 1177 | * check to determine if the process has moved to another queue. If |
| 1178 | * it has, and it is currently on a run queue, then move it. |
| 1179 | */ |
| 1180 | if ((lp->lwp_priority ^ newpriority) & ~PPQMASK) { |
| 1181 | lp->lwp_priority = newpriority; |
| 1182 | if (lp->lwp_mpflags & LWP_MP_ONRUNQ) { |
| 1183 | bsd4_remrunqueue_locked(lp); |
| 1184 | lp->lwp_rqtype = newrqtype; |
| 1185 | lp->lwp_rqindex = (newpriority & PRIMASK) / PPQ; |
| 1186 | bsd4_setrunqueue_locked(lp); |
| 1187 | checkpri = 1; |
| 1188 | } else { |
| 1189 | lp->lwp_rqtype = newrqtype; |
| 1190 | lp->lwp_rqindex = (newpriority & PRIMASK) / PPQ; |
| 1191 | checkpri = 0; |
| 1192 | } |
| 1193 | reschedcpu = lp->lwp_thread->td_gd->gd_cpuid; |
| 1194 | } else { |
| 1195 | lp->lwp_priority = newpriority; |
| 1196 | reschedcpu = -1; |
| 1197 | checkpri = 1; |
| 1198 | } |
| 1199 | |
| 1200 | /* |
| 1201 | * Determine if we need to reschedule the target cpu. This only |
| 1202 | * occurs if the LWP is already on a scheduler queue, which means |
| 1203 | * that idle cpu notification has already occured. At most we |
| 1204 | * need only issue a need_user_resched() on the appropriate cpu. |
| 1205 | * |
| 1206 | * The LWP may be owned by a CPU different from the current one, |
| 1207 | * in which case dd->uschedcp may be modified without an MP lock |
| 1208 | * or a spinlock held. The worst that happens is that the code |
| 1209 | * below causes a spurious need_user_resched() on the target CPU |
| 1210 | * and dd->pri to be wrong for a short period of time, both of |
| 1211 | * which are harmless. |
| 1212 | * |
| 1213 | * If checkpri is 0 we are adjusting the priority of the current |
| 1214 | * process, possibly higher (less desireable), so ignore the upri |
| 1215 | * check which will fail in that case. |
| 1216 | */ |
| 1217 | if (reschedcpu >= 0) { |
| 1218 | dd = &bsd4_pcpu[reschedcpu]; |
| 1219 | if ((bsd4_rdyprocmask & CPUMASK(reschedcpu)) && |
| 1220 | (checkpri == 0 || |
| 1221 | (dd->upri & ~PRIMASK) > (lp->lwp_priority & ~PRIMASK))) { |
| 1222 | #ifdef SMP |
| 1223 | if (reschedcpu == mycpu->gd_cpuid) { |
| 1224 | spin_unlock(&bsd4_spin); |
| 1225 | need_user_resched(); |
| 1226 | } else { |
| 1227 | spin_unlock(&bsd4_spin); |
| 1228 | atomic_clear_cpumask(&bsd4_rdyprocmask, |
| 1229 | CPUMASK(reschedcpu)); |
| 1230 | lwkt_send_ipiq(lp->lwp_thread->td_gd, |
| 1231 | need_user_resched_remote, NULL); |
| 1232 | } |
| 1233 | #else |
| 1234 | spin_unlock(&bsd4_spin); |
| 1235 | need_user_resched(); |
| 1236 | #endif |
| 1237 | } else { |
| 1238 | spin_unlock(&bsd4_spin); |
| 1239 | } |
| 1240 | } else { |
| 1241 | spin_unlock(&bsd4_spin); |
| 1242 | } |
| 1243 | crit_exit(); |
| 1244 | } |
| 1245 | |
| 1246 | /* |
| 1247 | * MPSAFE |
| 1248 | */ |
| 1249 | static |
| 1250 | void |
| 1251 | bsd4_yield(struct lwp *lp) |
| 1252 | { |
| 1253 | #if 0 |
| 1254 | /* FUTURE (or something similar) */ |
| 1255 | switch(lp->lwp_rqtype) { |
| 1256 | case RTP_PRIO_NORMAL: |
| 1257 | lp->lwp_estcpu = ESTCPULIM(lp->lwp_estcpu + ESTCPUINCR); |
| 1258 | break; |
| 1259 | default: |
| 1260 | break; |
| 1261 | } |
| 1262 | #endif |
| 1263 | need_user_resched(); |
| 1264 | } |
| 1265 | |
| 1266 | /* |
| 1267 | * Called from fork1() when a new child process is being created. |
| 1268 | * |
| 1269 | * Give the child process an initial estcpu that is more batch then |
| 1270 | * its parent and dock the parent for the fork (but do not |
| 1271 | * reschedule the parent). This comprises the main part of our batch |
| 1272 | * detection heuristic for both parallel forking and sequential execs. |
| 1273 | * |
| 1274 | * XXX lwp should be "spawning" instead of "forking" |
| 1275 | * |
| 1276 | * MPSAFE |
| 1277 | */ |
| 1278 | static void |
| 1279 | bsd4_forking(struct lwp *plp, struct lwp *lp) |
| 1280 | { |
| 1281 | /* |
| 1282 | * Put the child 4 queue slots (out of 32) higher than the parent |
| 1283 | * (less desireable than the parent). |
| 1284 | */ |
| 1285 | lp->lwp_estcpu = ESTCPULIM(plp->lwp_estcpu + ESTCPUPPQ * 4); |
| 1286 | |
| 1287 | /* |
| 1288 | * The batch status of children always starts out centerline |
| 1289 | * and will inch-up or inch-down as appropriate. It takes roughly |
| 1290 | * ~15 seconds of >50% cpu to hit the limit. |
| 1291 | */ |
| 1292 | lp->lwp_batch = BATCHMAX / 2; |
| 1293 | |
| 1294 | /* |
| 1295 | * Dock the parent a cost for the fork, protecting us from fork |
| 1296 | * bombs. If the parent is forking quickly make the child more |
| 1297 | * batchy. |
| 1298 | */ |
| 1299 | plp->lwp_estcpu = ESTCPULIM(plp->lwp_estcpu + ESTCPUPPQ / 16); |
| 1300 | } |
| 1301 | |
| 1302 | /* |
| 1303 | * Called when a parent waits for a child. |
| 1304 | * |
| 1305 | * MPSAFE |
| 1306 | */ |
| 1307 | static void |
| 1308 | bsd4_exiting(struct lwp *lp, struct proc *child_proc) |
| 1309 | { |
| 1310 | } |
| 1311 | |
| 1312 | /* |
| 1313 | * chooseproc() is called when a cpu needs a user process to LWKT schedule, |
| 1314 | * it selects a user process and returns it. If chklp is non-NULL and chklp |
| 1315 | * has a better or equal priority then the process that would otherwise be |
| 1316 | * chosen, NULL is returned. |
| 1317 | * |
| 1318 | * Until we fix the RUNQ code the chklp test has to be strict or we may |
| 1319 | * bounce between processes trying to acquire the current process designation. |
| 1320 | * |
| 1321 | * MPSAFE - must be called with bsd4_spin exclusive held. The spinlock is |
| 1322 | * left intact through the entire routine. |
| 1323 | */ |
| 1324 | static |
| 1325 | struct lwp * |
| 1326 | chooseproc_locked(struct lwp *chklp) |
| 1327 | { |
| 1328 | struct lwp *lp; |
| 1329 | struct rq *q; |
| 1330 | u_int32_t *which, *which2; |
| 1331 | u_int32_t pri; |
| 1332 | u_int32_t rtqbits; |
| 1333 | u_int32_t tsqbits; |
| 1334 | u_int32_t idqbits; |
| 1335 | cpumask_t cpumask; |
| 1336 | |
| 1337 | rtqbits = bsd4_rtqueuebits; |
| 1338 | tsqbits = bsd4_queuebits; |
| 1339 | idqbits = bsd4_idqueuebits; |
| 1340 | cpumask = mycpu->gd_cpumask; |
| 1341 | |
| 1342 | |
| 1343 | #ifdef SMP |
| 1344 | again: |
| 1345 | #endif |
| 1346 | if (rtqbits) { |
| 1347 | pri = bsfl(rtqbits); |
| 1348 | q = &bsd4_rtqueues[pri]; |
| 1349 | which = &bsd4_rtqueuebits; |
| 1350 | which2 = &rtqbits; |
| 1351 | } else if (tsqbits) { |
| 1352 | pri = bsfl(tsqbits); |
| 1353 | q = &bsd4_queues[pri]; |
| 1354 | which = &bsd4_queuebits; |
| 1355 | which2 = &tsqbits; |
| 1356 | } else if (idqbits) { |
| 1357 | pri = bsfl(idqbits); |
| 1358 | q = &bsd4_idqueues[pri]; |
| 1359 | which = &bsd4_idqueuebits; |
| 1360 | which2 = &idqbits; |
| 1361 | } else { |
| 1362 | return NULL; |
| 1363 | } |
| 1364 | lp = TAILQ_FIRST(q); |
| 1365 | KASSERT(lp, ("chooseproc: no lwp on busy queue")); |
| 1366 | |
| 1367 | #ifdef SMP |
| 1368 | while ((lp->lwp_cpumask & cpumask) == 0) { |
| 1369 | lp = TAILQ_NEXT(lp, lwp_procq); |
| 1370 | if (lp == NULL) { |
| 1371 | *which2 &= ~(1 << pri); |
| 1372 | goto again; |
| 1373 | } |
| 1374 | } |
| 1375 | #endif |
| 1376 | |
| 1377 | /* |
| 1378 | * If the passed lwp <chklp> is reasonably close to the selected |
| 1379 | * lwp <lp>, return NULL (indicating that <chklp> should be kept). |
| 1380 | * |
| 1381 | * Note that we must error on the side of <chklp> to avoid bouncing |
| 1382 | * between threads in the acquire code. |
| 1383 | */ |
| 1384 | if (chklp) { |
| 1385 | if (chklp->lwp_priority < lp->lwp_priority + PPQ) |
| 1386 | return(NULL); |
| 1387 | } |
| 1388 | |
| 1389 | #ifdef SMP |
| 1390 | /* |
| 1391 | * If the chosen lwp does not reside on this cpu spend a few |
| 1392 | * cycles looking for a better candidate at the same priority level. |
| 1393 | * This is a fallback check, setrunqueue() tries to wakeup the |
| 1394 | * correct cpu and is our front-line affinity. |
| 1395 | */ |
| 1396 | if (lp->lwp_thread->td_gd != mycpu && |
| 1397 | (chklp = TAILQ_NEXT(lp, lwp_procq)) != NULL |
| 1398 | ) { |
| 1399 | if (chklp->lwp_thread->td_gd == mycpu) { |
| 1400 | ++choose_affinity; |
| 1401 | lp = chklp; |
| 1402 | } |
| 1403 | } |
| 1404 | #endif |
| 1405 | |
| 1406 | KTR_COND_LOG(usched_chooseproc, |
| 1407 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 1408 | lp->lwp_proc->p_pid, |
| 1409 | lp->lwp_thread->td_gd->gd_cpuid, |
| 1410 | mycpu->gd_cpuid); |
| 1411 | |
| 1412 | TAILQ_REMOVE(q, lp, lwp_procq); |
| 1413 | --bsd4_runqcount; |
| 1414 | if (TAILQ_EMPTY(q)) |
| 1415 | *which &= ~(1 << pri); |
| 1416 | KASSERT((lp->lwp_mpflags & LWP_MP_ONRUNQ) != 0, ("not on runq6!")); |
| 1417 | atomic_clear_int(&lp->lwp_mpflags, LWP_MP_ONRUNQ); |
| 1418 | return lp; |
| 1419 | } |
| 1420 | |
| 1421 | #ifdef SMP |
| 1422 | /* |
| 1423 | * chooseproc() - with a cache coherence heuristic. Try to pull a process that |
| 1424 | * has its home on the current CPU> If the process doesn't have its home here |
| 1425 | * and is a batchy one (see batcy_looser_pri_test), we can wait for a |
| 1426 | * sched_tick, may be its home will become free and pull it in. Anyway, |
| 1427 | * we can't wait more than one tick. If that tick expired, we pull in that |
| 1428 | * process, no matter what. |
| 1429 | */ |
| 1430 | static |
| 1431 | struct lwp * |
| 1432 | chooseproc_locked_cache_coherent(struct lwp *chklp) |
| 1433 | { |
| 1434 | struct lwp *lp; |
| 1435 | struct rq *q; |
| 1436 | u_int32_t *which, *which2; |
| 1437 | u_int32_t pri; |
| 1438 | u_int32_t checks; |
| 1439 | u_int32_t rtqbits; |
| 1440 | u_int32_t tsqbits; |
| 1441 | u_int32_t idqbits; |
| 1442 | cpumask_t cpumask; |
| 1443 | |
| 1444 | struct lwp * min_level_lwp = NULL; |
| 1445 | struct rq *min_q = NULL; |
| 1446 | cpumask_t siblings; |
| 1447 | cpu_node_t* cpunode = NULL; |
| 1448 | u_int32_t min_level = MAXCPU; /* number of levels < MAXCPU */ |
| 1449 | u_int32_t *min_which = NULL; |
| 1450 | u_int32_t min_pri = 0; |
| 1451 | u_int32_t level = 0; |
| 1452 | |
| 1453 | rtqbits = bsd4_rtqueuebits; |
| 1454 | tsqbits = bsd4_queuebits; |
| 1455 | idqbits = bsd4_idqueuebits; |
| 1456 | cpumask = mycpu->gd_cpumask; |
| 1457 | |
| 1458 | /* Get the mask coresponding to the sysctl configured level */ |
| 1459 | cpunode = bsd4_pcpu[mycpu->gd_cpuid].cpunode; |
| 1460 | level = usched_bsd4_stick_to_level; |
| 1461 | while (level) { |
| 1462 | cpunode = cpunode->parent_node; |
| 1463 | level--; |
| 1464 | } |
| 1465 | /* The cpus which can ellect a process */ |
| 1466 | siblings = cpunode->members; |
| 1467 | |
| 1468 | again: |
| 1469 | if (rtqbits) { |
| 1470 | pri = bsfl(rtqbits); |
| 1471 | q = &bsd4_rtqueues[pri]; |
| 1472 | which = &bsd4_rtqueuebits; |
| 1473 | which2 = &rtqbits; |
| 1474 | } else if (tsqbits) { |
| 1475 | pri = bsfl(tsqbits); |
| 1476 | q = &bsd4_queues[pri]; |
| 1477 | which = &bsd4_queuebits; |
| 1478 | which2 = &tsqbits; |
| 1479 | } else if (idqbits) { |
| 1480 | pri = bsfl(idqbits); |
| 1481 | q = &bsd4_idqueues[pri]; |
| 1482 | which = &bsd4_idqueuebits; |
| 1483 | which2 = &idqbits; |
| 1484 | } else { |
| 1485 | return NULL; |
| 1486 | } |
| 1487 | lp = TAILQ_FIRST(q); |
| 1488 | KASSERT(lp, ("chooseproc: no lwp on busy queue")); |
| 1489 | |
| 1490 | /* Limit the number of checks/queue to a configurable value to |
| 1491 | * minimize the contention (we are in a locked region |
| 1492 | */ |
| 1493 | for (checks = 0; checks < usched_bsd4_queue_checks; checks++) { |
| 1494 | |
| 1495 | if ((lp->lwp_cpumask & cpumask) == 0 || |
| 1496 | ((siblings & lp->lwp_thread->td_gd->gd_cpumask) == 0 && |
| 1497 | batchy_looser_pri_test(lp) && |
| 1498 | (lp->lwp_setrunqueue_ticks == sched_ticks || |
| 1499 | lp->lwp_setrunqueue_ticks == (int)(sched_ticks - 1)))) { |
| 1500 | |
| 1501 | KTR_COND_LOG(usched_chooseproc_cc_not_good, |
| 1502 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 1503 | lp->lwp_proc->p_pid, |
| 1504 | lp->lwp_thread->td_gd->gd_cpumask, |
| 1505 | siblings, |
| 1506 | cpumask); |
| 1507 | |
| 1508 | cpunode = bsd4_pcpu[lp->lwp_thread->td_gd->gd_cpuid].cpunode; |
| 1509 | level = 0; |
| 1510 | while (cpunode) { |
| 1511 | if (cpunode->members & cpumask) { |
| 1512 | break; |
| 1513 | } |
| 1514 | cpunode = cpunode->parent_node; |
| 1515 | level++; |
| 1516 | } |
| 1517 | if (level < min_level) { |
| 1518 | min_level_lwp = lp; |
| 1519 | min_level = level; |
| 1520 | min_q = q; |
| 1521 | min_which = which; |
| 1522 | min_pri = pri; |
| 1523 | } |
| 1524 | |
| 1525 | lp = TAILQ_NEXT(lp, lwp_procq); |
| 1526 | if (lp == NULL) { |
| 1527 | *which2 &= ~(1 << pri); |
| 1528 | goto again; |
| 1529 | } |
| 1530 | } else { |
| 1531 | KTR_COND_LOG(usched_chooseproc_cc_elected, |
| 1532 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 1533 | lp->lwp_proc->p_pid, |
| 1534 | lp->lwp_thread->td_gd->gd_cpumask, |
| 1535 | siblings, |
| 1536 | cpumask); |
| 1537 | |
| 1538 | goto found; |
| 1539 | } |
| 1540 | } |
| 1541 | lp = min_level_lwp; |
| 1542 | q = min_q; |
| 1543 | which = min_which; |
| 1544 | pri = min_pri; |
| 1545 | KASSERT(lp, ("chooseproc: at least the first lp was good")); |
| 1546 | |
| 1547 | found: |
| 1548 | |
| 1549 | /* |
| 1550 | * If the passed lwp <chklp> is reasonably close to the selected |
| 1551 | * lwp <lp>, return NULL (indicating that <chklp> should be kept). |
| 1552 | * |
| 1553 | * Note that we must error on the side of <chklp> to avoid bouncing |
| 1554 | * between threads in the acquire code. |
| 1555 | */ |
| 1556 | if (chklp) { |
| 1557 | if (chklp->lwp_priority < lp->lwp_priority + PPQ) |
| 1558 | return(NULL); |
| 1559 | } |
| 1560 | |
| 1561 | KTR_COND_LOG(usched_chooseproc_cc, |
| 1562 | lp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 1563 | lp->lwp_proc->p_pid, |
| 1564 | lp->lwp_thread->td_gd->gd_cpuid, |
| 1565 | mycpu->gd_cpuid); |
| 1566 | |
| 1567 | TAILQ_REMOVE(q, lp, lwp_procq); |
| 1568 | --bsd4_runqcount; |
| 1569 | if (TAILQ_EMPTY(q)) |
| 1570 | *which &= ~(1 << pri); |
| 1571 | KASSERT((lp->lwp_mpflags & LWP_MP_ONRUNQ) != 0, ("not on runq6!")); |
| 1572 | atomic_clear_int(&lp->lwp_mpflags, LWP_MP_ONRUNQ); |
| 1573 | return lp; |
| 1574 | } |
| 1575 | |
| 1576 | |
| 1577 | static |
| 1578 | void |
| 1579 | need_user_resched_remote(void *dummy) |
| 1580 | { |
| 1581 | globaldata_t gd = mycpu; |
| 1582 | bsd4_pcpu_t dd = &bsd4_pcpu[gd->gd_cpuid]; |
| 1583 | |
| 1584 | need_user_resched(); |
| 1585 | wakeup(&dd->helper_thread); |
| 1586 | } |
| 1587 | |
| 1588 | #endif |
| 1589 | |
| 1590 | /* |
| 1591 | * bsd4_remrunqueue_locked() removes a given process from the run queue |
| 1592 | * that it is on, clearing the queue busy bit if it becomes empty. |
| 1593 | * |
| 1594 | * Note that user process scheduler is different from the LWKT schedule. |
| 1595 | * The user process scheduler only manages user processes but it uses LWKT |
| 1596 | * underneath, and a user process operating in the kernel will often be |
| 1597 | * 'released' from our management. |
| 1598 | * |
| 1599 | * MPSAFE - bsd4_spin must be held exclusively on call |
| 1600 | */ |
| 1601 | static void |
| 1602 | bsd4_remrunqueue_locked(struct lwp *lp) |
| 1603 | { |
| 1604 | struct rq *q; |
| 1605 | u_int32_t *which; |
| 1606 | u_int8_t pri; |
| 1607 | |
| 1608 | KKASSERT(lp->lwp_mpflags & LWP_MP_ONRUNQ); |
| 1609 | atomic_clear_int(&lp->lwp_mpflags, LWP_MP_ONRUNQ); |
| 1610 | --bsd4_runqcount; |
| 1611 | KKASSERT(bsd4_runqcount >= 0); |
| 1612 | |
| 1613 | pri = lp->lwp_rqindex; |
| 1614 | switch(lp->lwp_rqtype) { |
| 1615 | case RTP_PRIO_NORMAL: |
| 1616 | q = &bsd4_queues[pri]; |
| 1617 | which = &bsd4_queuebits; |
| 1618 | break; |
| 1619 | case RTP_PRIO_REALTIME: |
| 1620 | case RTP_PRIO_FIFO: |
| 1621 | q = &bsd4_rtqueues[pri]; |
| 1622 | which = &bsd4_rtqueuebits; |
| 1623 | break; |
| 1624 | case RTP_PRIO_IDLE: |
| 1625 | q = &bsd4_idqueues[pri]; |
| 1626 | which = &bsd4_idqueuebits; |
| 1627 | break; |
| 1628 | default: |
| 1629 | panic("remrunqueue: invalid rtprio type"); |
| 1630 | /* NOT REACHED */ |
| 1631 | } |
| 1632 | TAILQ_REMOVE(q, lp, lwp_procq); |
| 1633 | if (TAILQ_EMPTY(q)) { |
| 1634 | KASSERT((*which & (1 << pri)) != 0, |
| 1635 | ("remrunqueue: remove from empty queue")); |
| 1636 | *which &= ~(1 << pri); |
| 1637 | } |
| 1638 | } |
| 1639 | |
| 1640 | /* |
| 1641 | * bsd4_setrunqueue_locked() |
| 1642 | * |
| 1643 | * Add a process whos rqtype and rqindex had previously been calculated |
| 1644 | * onto the appropriate run queue. Determine if the addition requires |
| 1645 | * a reschedule on a cpu and return the cpuid or -1. |
| 1646 | * |
| 1647 | * NOTE: Lower priorities are better priorities. |
| 1648 | * |
| 1649 | * MPSAFE - bsd4_spin must be held exclusively on call |
| 1650 | */ |
| 1651 | static void |
| 1652 | bsd4_setrunqueue_locked(struct lwp *lp) |
| 1653 | { |
| 1654 | struct rq *q; |
| 1655 | u_int32_t *which; |
| 1656 | int pri; |
| 1657 | |
| 1658 | KKASSERT((lp->lwp_mpflags & LWP_MP_ONRUNQ) == 0); |
| 1659 | atomic_set_int(&lp->lwp_mpflags, LWP_MP_ONRUNQ); |
| 1660 | ++bsd4_runqcount; |
| 1661 | |
| 1662 | pri = lp->lwp_rqindex; |
| 1663 | |
| 1664 | switch(lp->lwp_rqtype) { |
| 1665 | case RTP_PRIO_NORMAL: |
| 1666 | q = &bsd4_queues[pri]; |
| 1667 | which = &bsd4_queuebits; |
| 1668 | break; |
| 1669 | case RTP_PRIO_REALTIME: |
| 1670 | case RTP_PRIO_FIFO: |
| 1671 | q = &bsd4_rtqueues[pri]; |
| 1672 | which = &bsd4_rtqueuebits; |
| 1673 | break; |
| 1674 | case RTP_PRIO_IDLE: |
| 1675 | q = &bsd4_idqueues[pri]; |
| 1676 | which = &bsd4_idqueuebits; |
| 1677 | break; |
| 1678 | default: |
| 1679 | panic("remrunqueue: invalid rtprio type"); |
| 1680 | /* NOT REACHED */ |
| 1681 | } |
| 1682 | |
| 1683 | /* |
| 1684 | * Add to the correct queue and set the appropriate bit. If no |
| 1685 | * lower priority (i.e. better) processes are in the queue then |
| 1686 | * we want a reschedule, calculate the best cpu for the job. |
| 1687 | * |
| 1688 | * Always run reschedules on the LWPs original cpu. |
| 1689 | */ |
| 1690 | TAILQ_INSERT_TAIL(q, lp, lwp_procq); |
| 1691 | *which |= 1 << pri; |
| 1692 | } |
| 1693 | |
| 1694 | #ifdef SMP |
| 1695 | |
| 1696 | /* |
| 1697 | * For SMP systems a user scheduler helper thread is created for each |
| 1698 | * cpu and is used to allow one cpu to wakeup another for the purposes of |
| 1699 | * scheduling userland threads from setrunqueue(). |
| 1700 | * |
| 1701 | * UP systems do not need the helper since there is only one cpu. |
| 1702 | * |
| 1703 | * We can't use the idle thread for this because we might block. |
| 1704 | * Additionally, doing things this way allows us to HLT idle cpus |
| 1705 | * on MP systems. |
| 1706 | * |
| 1707 | * MPSAFE |
| 1708 | */ |
| 1709 | static void |
| 1710 | sched_thread(void *dummy) |
| 1711 | { |
| 1712 | globaldata_t gd; |
| 1713 | bsd4_pcpu_t dd; |
| 1714 | bsd4_pcpu_t tmpdd; |
| 1715 | struct lwp *nlp; |
| 1716 | cpumask_t mask; |
| 1717 | int cpuid; |
| 1718 | #ifdef SMP |
| 1719 | cpumask_t tmpmask; |
| 1720 | int tmpid; |
| 1721 | #endif |
| 1722 | |
| 1723 | gd = mycpu; |
| 1724 | cpuid = gd->gd_cpuid; /* doesn't change */ |
| 1725 | mask = gd->gd_cpumask; /* doesn't change */ |
| 1726 | dd = &bsd4_pcpu[cpuid]; |
| 1727 | |
| 1728 | /* |
| 1729 | * Since we are woken up only when no user processes are scheduled |
| 1730 | * on a cpu, we can run at an ultra low priority. |
| 1731 | */ |
| 1732 | lwkt_setpri_self(TDPRI_USER_SCHEDULER); |
| 1733 | |
| 1734 | tsleep(&dd->helper_thread, PINTERLOCKED, "sched_thread_sleep", 0); |
| 1735 | |
| 1736 | for (;;) { |
| 1737 | //again: |
| 1738 | /* |
| 1739 | * We use the LWKT deschedule-interlock trick to avoid racing |
| 1740 | * bsd4_rdyprocmask. This means we cannot block through to the |
| 1741 | * manual lwkt_switch() call we make below. |
| 1742 | */ |
| 1743 | crit_enter_gd(gd); |
| 1744 | //lwkt_deschedule_self(gd->gd_curthread); |
| 1745 | tsleep_interlock(&dd->helper_thread, 0); |
| 1746 | spin_lock(&bsd4_spin); |
| 1747 | atomic_set_cpumask(&bsd4_rdyprocmask, mask); |
| 1748 | |
| 1749 | clear_user_resched(); /* This satisfied the reschedule request */ |
| 1750 | dd->rrcount = 0; /* Reset the round-robin counter */ |
| 1751 | |
| 1752 | if ((bsd4_curprocmask & mask) == 0) { |
| 1753 | /* |
| 1754 | * No thread is currently scheduled. |
| 1755 | */ |
| 1756 | KKASSERT(dd->uschedcp == NULL); |
| 1757 | if ((nlp = chooseproc_locked(NULL)) != NULL) { |
| 1758 | |
| 1759 | KTR_COND_LOG(usched_sched_thread_no_process, |
| 1760 | nlp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 1761 | gd->gd_cpuid, |
| 1762 | nlp->lwp_proc->p_pid, |
| 1763 | nlp->lwp_thread->td_gd->gd_cpuid); |
| 1764 | |
| 1765 | atomic_set_cpumask(&bsd4_curprocmask, mask); |
| 1766 | dd->upri = nlp->lwp_priority; |
| 1767 | dd->uschedcp = nlp; |
| 1768 | spin_unlock(&bsd4_spin); |
| 1769 | #ifdef SMP |
| 1770 | lwkt_acquire(nlp->lwp_thread); |
| 1771 | #endif |
| 1772 | lwkt_schedule(nlp->lwp_thread); |
| 1773 | } else { |
| 1774 | spin_unlock(&bsd4_spin); |
| 1775 | } |
| 1776 | } else if (bsd4_runqcount) { |
| 1777 | if ((nlp = chooseproc_locked(dd->uschedcp)) != NULL) { |
| 1778 | |
| 1779 | KTR_COND_LOG(usched_sched_thread_process, |
| 1780 | nlp->lwp_proc->p_pid == usched_bsd4_pid_debug, |
| 1781 | gd->gd_cpuid, |
| 1782 | nlp->lwp_proc->p_pid, |
| 1783 | nlp->lwp_thread->td_gd->gd_cpuid); |
| 1784 | |
| 1785 | dd->upri = nlp->lwp_priority; |
| 1786 | dd->uschedcp = nlp; |
| 1787 | spin_unlock(&bsd4_spin); |
| 1788 | #ifdef SMP |
| 1789 | lwkt_acquire(nlp->lwp_thread); |
| 1790 | #endif |
| 1791 | lwkt_schedule(nlp->lwp_thread); |
| 1792 | } else { |
| 1793 | /* |
| 1794 | * CHAINING CONDITION TRAIN |
| 1795 | * |
| 1796 | * We could not deal with the scheduler wakeup |
| 1797 | * request on this cpu, locate a ready scheduler |
| 1798 | * with no current lp assignment and chain to it. |
| 1799 | * |
| 1800 | * This ensures that a wakeup race which fails due |
| 1801 | * to priority test does not leave other unscheduled |
| 1802 | * cpus idle when the runqueue is not empty. |
| 1803 | */ |
| 1804 | tmpmask = ~bsd4_curprocmask & |
| 1805 | bsd4_rdyprocmask & smp_active_mask; |
| 1806 | if (tmpmask) { |
| 1807 | tmpid = BSFCPUMASK(tmpmask); |
| 1808 | tmpdd = &bsd4_pcpu[tmpid]; |
| 1809 | atomic_clear_cpumask(&bsd4_rdyprocmask, |
| 1810 | CPUMASK(tmpid)); |
| 1811 | spin_unlock(&bsd4_spin); |
| 1812 | wakeup(&tmpdd->helper_thread); |
| 1813 | } else { |
| 1814 | spin_unlock(&bsd4_spin); |
| 1815 | } |
| 1816 | |
| 1817 | KTR_LOG(usched_sched_thread_no_process_found, |
| 1818 | gd->gd_cpuid, |
| 1819 | tmpmask); |
| 1820 | } |
| 1821 | } else { |
| 1822 | /* |
| 1823 | * The runq is empty. |
| 1824 | */ |
| 1825 | spin_unlock(&bsd4_spin); |
| 1826 | } |
| 1827 | |
| 1828 | /* |
| 1829 | * We're descheduled unless someone scheduled us. Switch away. |
| 1830 | * Exiting the critical section will cause splz() to be called |
| 1831 | * for us if interrupts and such are pending. |
| 1832 | */ |
| 1833 | crit_exit_gd(gd); |
| 1834 | tsleep(&dd->helper_thread, PINTERLOCKED, "sched_thread_sleep", 0); |
| 1835 | // lwkt_switch(); |
| 1836 | } |
| 1837 | } |
| 1838 | |
| 1839 | /* sysctl stick_to_level parameter */ |
| 1840 | static int |
| 1841 | sysctl_usched_bsd4_stick_to_level(SYSCTL_HANDLER_ARGS) |
| 1842 | { |
| 1843 | int error, new_val; |
| 1844 | |
| 1845 | new_val = usched_bsd4_stick_to_level; |
| 1846 | |
| 1847 | error = sysctl_handle_int(oidp, &new_val, 0, req); |
| 1848 | if (error != 0 || req->newptr == NULL) |
| 1849 | return (error); |
| 1850 | if (new_val > cpu_topology_levels_number - 1 || |
| 1851 | new_val < 0) |
| 1852 | return (EINVAL); |
| 1853 | usched_bsd4_stick_to_level = new_val; |
| 1854 | return (0); |
| 1855 | } |
| 1856 | |
| 1857 | /* |
| 1858 | * Setup our scheduler helpers. Note that curprocmask bit 0 has already |
| 1859 | * been cleared by rqinit() and we should not mess with it further. |
| 1860 | */ |
| 1861 | static void |
| 1862 | sched_thread_cpu_init(void) |
| 1863 | { |
| 1864 | int i; |
| 1865 | int cpuid; |
| 1866 | int smt_not_supported = 0; |
| 1867 | int cache_coherent_not_supported = 0; |
| 1868 | if (bootverbose) |
| 1869 | kprintf("Start scheduler helpers on cpus:\n"); |
| 1870 | |
| 1871 | sysctl_ctx_init(&usched_bsd4_sysctl_ctx); |
| 1872 | usched_bsd4_sysctl_tree = SYSCTL_ADD_NODE(&usched_bsd4_sysctl_ctx, |
| 1873 | SYSCTL_STATIC_CHILDREN(_kern), OID_AUTO, |
| 1874 | "usched_bsd4", CTLFLAG_RD, 0, ""); |
| 1875 | |
| 1876 | for (i = 0; i < ncpus; ++i) { |
| 1877 | bsd4_pcpu_t dd = &bsd4_pcpu[i]; |
| 1878 | cpumask_t mask = CPUMASK(i); |
| 1879 | |
| 1880 | if ((mask & smp_active_mask) == 0) |
| 1881 | continue; |
| 1882 | |
| 1883 | dd->cpunode = get_cpu_node_by_cpuid(i); |
| 1884 | |
| 1885 | if (dd->cpunode == NULL) { |
| 1886 | smt_not_supported = 1; |
| 1887 | cache_coherent_not_supported = 1; |
| 1888 | if (bootverbose) |
| 1889 | kprintf ("\tcpu%d - WARNING: No CPU NODE found for cpu\n", i); |
| 1890 | |
| 1891 | } else { |
| 1892 | |
| 1893 | switch (dd->cpunode->type) { |
| 1894 | case THREAD_LEVEL: |
| 1895 | if (bootverbose) |
| 1896 | kprintf ("\tcpu%d - HyperThreading available. " |
| 1897 | "Core siblings: ", i); |
| 1898 | break; |
| 1899 | case CORE_LEVEL: |
| 1900 | smt_not_supported = 1; |
| 1901 | |
| 1902 | if (bootverbose) |
| 1903 | kprintf ("\tcpu%d - No HT available, multi-core/physical " |
| 1904 | "cpu. Physical siblings: ", i); |
| 1905 | break; |
| 1906 | case CHIP_LEVEL: |
| 1907 | smt_not_supported = 1; |
| 1908 | |
| 1909 | if (bootverbose) |
| 1910 | kprintf ("\tcpu%d - No HT available, single-core/physical cpu. " |
| 1911 | "Package Siblings: ", i); |
| 1912 | break; |
| 1913 | default: |
| 1914 | if (bootverbose) |
| 1915 | kprintf ("\tcpu%d - Unknown cpunode->type. Siblings: ", i); |
| 1916 | break; |
| 1917 | } |
| 1918 | |
| 1919 | if (bootverbose) { |
| 1920 | if (dd->cpunode->parent_node != NULL) { |
| 1921 | CPUSET_FOREACH(cpuid, dd->cpunode->parent_node->members) |
| 1922 | kprintf("cpu%d ", cpuid); |
| 1923 | kprintf("\n"); |
| 1924 | } else { |
| 1925 | kprintf(" no siblings\n"); |
| 1926 | } |
| 1927 | } |
| 1928 | } |
| 1929 | |
| 1930 | lwkt_create(sched_thread, NULL, NULL, &dd->helper_thread, |
| 1931 | 0, i, "usched %d", i); |
| 1932 | |
| 1933 | /* |
| 1934 | * Allow user scheduling on the target cpu. cpu #0 has already |
| 1935 | * been enabled in rqinit(). |
| 1936 | */ |
| 1937 | if (i) |
| 1938 | atomic_clear_cpumask(&bsd4_curprocmask, mask); |
| 1939 | atomic_set_cpumask(&bsd4_rdyprocmask, mask); |
| 1940 | dd->upri = PRIBASE_NULL; |
| 1941 | |
| 1942 | } |
| 1943 | |
| 1944 | /* usched_bsd4 sysctl configurable parameters */ |
| 1945 | |
| 1946 | SYSCTL_ADD_INT(&usched_bsd4_sysctl_ctx, |
| 1947 | SYSCTL_CHILDREN(usched_bsd4_sysctl_tree), |
| 1948 | OID_AUTO, "rrinterval", CTLFLAG_RW, |
| 1949 | &usched_bsd4_rrinterval, 0, ""); |
| 1950 | SYSCTL_ADD_INT(&usched_bsd4_sysctl_ctx, |
| 1951 | SYSCTL_CHILDREN(usched_bsd4_sysctl_tree), |
| 1952 | OID_AUTO, "decay", CTLFLAG_RW, |
| 1953 | &usched_bsd4_decay, 0, "Extra decay when not running"); |
| 1954 | SYSCTL_ADD_INT(&usched_bsd4_sysctl_ctx, |
| 1955 | SYSCTL_CHILDREN(usched_bsd4_sysctl_tree), |
| 1956 | OID_AUTO, "batch_time", CTLFLAG_RW, |
| 1957 | &usched_bsd4_batch_time, 0, "Minimum batch counter value"); |
| 1958 | |
| 1959 | /* Add enable/disable option for SMT scheduling if supported */ |
| 1960 | if (smt_not_supported) { |
| 1961 | usched_bsd4_smt = 0; |
| 1962 | SYSCTL_ADD_STRING(&usched_bsd4_sysctl_ctx, |
| 1963 | SYSCTL_CHILDREN(usched_bsd4_sysctl_tree), |
| 1964 | OID_AUTO, "smt", CTLFLAG_RD, |
| 1965 | "NOT SUPPORTED", 0, "SMT NOT SUPPORTED"); |
| 1966 | } else { |
| 1967 | usched_bsd4_smt = 1; |
| 1968 | SYSCTL_ADD_INT(&usched_bsd4_sysctl_ctx, |
| 1969 | SYSCTL_CHILDREN(usched_bsd4_sysctl_tree), |
| 1970 | OID_AUTO, "smt", CTLFLAG_RW, |
| 1971 | &usched_bsd4_smt, 0, "Enable/Disable SMT scheduling"); |
| 1972 | |
| 1973 | } |
| 1974 | |
| 1975 | /* Add enable/disable option for cache coherent scheduling if supported */ |
| 1976 | if (cache_coherent_not_supported) { |
| 1977 | #ifdef SMP |
| 1978 | usched_bsd4_cache_coherent = 0; |
| 1979 | SYSCTL_ADD_STRING(&usched_bsd4_sysctl_ctx, |
| 1980 | SYSCTL_CHILDREN(usched_bsd4_sysctl_tree), |
| 1981 | OID_AUTO, "cache_coherent", CTLFLAG_RD, |
| 1982 | "NOT SUPPORTED", 0, "Cache coherence NOT SUPPORTED"); |
| 1983 | #endif |
| 1984 | } else { |
| 1985 | #ifdef SMP |
| 1986 | usched_bsd4_cache_coherent = 1; |
| 1987 | SYSCTL_ADD_INT(&usched_bsd4_sysctl_ctx, |
| 1988 | SYSCTL_CHILDREN(usched_bsd4_sysctl_tree), |
| 1989 | OID_AUTO, "cache_coherent", CTLFLAG_RW, |
| 1990 | &usched_bsd4_cache_coherent, 0, |
| 1991 | "Enable/Disable cache coherent scheduling"); |
| 1992 | #endif |
| 1993 | |
| 1994 | SYSCTL_ADD_INT(&usched_bsd4_sysctl_ctx, |
| 1995 | SYSCTL_CHILDREN(usched_bsd4_sysctl_tree), |
| 1996 | OID_AUTO, "upri_affinity", CTLFLAG_RW, |
| 1997 | &usched_bsd4_upri_affinity, 1, |
| 1998 | "Number of PPQs in user priority check"); |
| 1999 | |
| 2000 | SYSCTL_ADD_INT(&usched_bsd4_sysctl_ctx, |
| 2001 | SYSCTL_CHILDREN(usched_bsd4_sysctl_tree), |
| 2002 | OID_AUTO, "queue_checks", CTLFLAG_RW, |
| 2003 | &usched_bsd4_queue_checks, 5, |
| 2004 | "Number of LWP to check from a queue before giving up"); |
| 2005 | |
| 2006 | SYSCTL_ADD_PROC(&usched_bsd4_sysctl_ctx, |
| 2007 | SYSCTL_CHILDREN(usched_bsd4_sysctl_tree), |
| 2008 | OID_AUTO, "stick_to_level", CTLTYPE_INT | CTLFLAG_RW, |
| 2009 | NULL, sizeof usched_bsd4_stick_to_level, |
| 2010 | sysctl_usched_bsd4_stick_to_level, "I", |
| 2011 | "Stick a process to this level. See sysctl" |
| 2012 | "paremter hw.cpu_topology.level_description"); |
| 2013 | } |
| 2014 | } |
| 2015 | SYSINIT(uschedtd, SI_BOOT2_USCHED, SI_ORDER_SECOND, |
| 2016 | sched_thread_cpu_init, NULL) |
| 2017 | #else /* No SMP options - just add the configurable parameters to sysctl */ |
| 2018 | |
| 2019 | static void |
| 2020 | sched_sysctl_tree_init(void) |
| 2021 | { |
| 2022 | sysctl_ctx_init(&usched_bsd4_sysctl_ctx); |
| 2023 | usched_bsd4_sysctl_tree = SYSCTL_ADD_NODE(&usched_bsd4_sysctl_ctx, |
| 2024 | SYSCTL_STATIC_CHILDREN(_kern), OID_AUTO, |
| 2025 | "usched_bsd4", CTLFLAG_RD, 0, ""); |
| 2026 | |
| 2027 | /* usched_bsd4 sysctl configurable parameters */ |
| 2028 | SYSCTL_ADD_INT(&usched_bsd4_sysctl_ctx, |
| 2029 | SYSCTL_CHILDREN(usched_bsd4_sysctl_tree), |
| 2030 | OID_AUTO, "rrinterval", CTLFLAG_RW, |
| 2031 | &usched_bsd4_rrinterval, 0, ""); |
| 2032 | SYSCTL_ADD_INT(&usched_bsd4_sysctl_ctx, |
| 2033 | SYSCTL_CHILDREN(usched_bsd4_sysctl_tree), |
| 2034 | OID_AUTO, "decay", CTLFLAG_RW, |
| 2035 | &usched_bsd4_decay, 0, "Extra decay when not running"); |
| 2036 | SYSCTL_ADD_INT(&usched_bsd4_sysctl_ctx, |
| 2037 | SYSCTL_CHILDREN(usched_bsd4_sysctl_tree), |
| 2038 | OID_AUTO, "batch_time", CTLFLAG_RW, |
| 2039 | &usched_bsd4_batch_time, 0, "Minimum batch counter value"); |
| 2040 | } |
| 2041 | SYSINIT(uschedtd, SI_BOOT2_USCHED, SI_ORDER_SECOND, |
| 2042 | sched_sysctl_tree_init, NULL) |
| 2043 | #endif |
| 2044 | |