kern_timeout.c revision 248141
11541Srgrimes/*- 21541Srgrimes * Copyright (c) 1982, 1986, 1991, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * (c) UNIX System Laboratories, Inc. 51541Srgrimes * All or some portions of this file are derived from material licensed 61541Srgrimes * to the University of California by American Telephone and Telegraph 71541Srgrimes * Co. or Unix System Laboratories, Inc. and are reproduced herein with 81541Srgrimes * the permission of UNIX System Laboratories, Inc. 91541Srgrimes * 101541Srgrimes * Redistribution and use in source and binary forms, with or without 111541Srgrimes * modification, are permitted provided that the following conditions 121541Srgrimes * are met: 131541Srgrimes * 1. Redistributions of source code must retain the above copyright 141541Srgrimes * notice, this list of conditions and the following disclaimer. 151541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 161541Srgrimes * notice, this list of conditions and the following disclaimer in the 171541Srgrimes * documentation and/or other materials provided with the distribution. 181541Srgrimes * 4. Neither the name of the University nor the names of its contributors 191541Srgrimes * may be used to endorse or promote products derived from this software 201541Srgrimes * without specific prior written permission. 211541Srgrimes * 221541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 231541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 241541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 251541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 261541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 271541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 281541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 291541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 301541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 311541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 321541Srgrimes * SUCH DAMAGE. 331541Srgrimes * 3444510Swollman * From: @(#)kern_clock.c 8.5 (Berkeley) 1/21/94 351541Srgrimes */ 361541Srgrimes 37116182Sobrien#include <sys/cdefs.h> 38116182Sobrien__FBSDID("$FreeBSD: head/sys/kern/kern_timeout.c 248141 2013-03-10 22:55:35Z andre $"); 39116182Sobrien 40247777Sdavide#include "opt_callout_profiling.h" 41187664Srwatson#include "opt_kdtrace.h" 42247777Sdavide#if defined(__arm__) 43247777Sdavide#include "opt_timer.h" 44247777Sdavide#endif 45187664Srwatson 461541Srgrimes#include <sys/param.h> 471541Srgrimes#include <sys/systm.h> 48177859Sjeff#include <sys/bus.h> 4933392Sphk#include <sys/callout.h> 50248031Sandre#include <sys/file.h> 51177859Sjeff#include <sys/interrupt.h> 521541Srgrimes#include <sys/kernel.h> 53133229Srwatson#include <sys/ktr.h> 5474914Sjhb#include <sys/lock.h> 55177859Sjeff#include <sys/malloc.h> 5668840Sjhb#include <sys/mutex.h> 57150188Sjhb#include <sys/proc.h> 58187664Srwatson#include <sys/sdt.h> 59171053Sattilio#include <sys/sleepqueue.h> 60115810Sphk#include <sys/sysctl.h> 61177859Sjeff#include <sys/smp.h> 621541Srgrimes 63220456Sattilio#ifdef SMP 64220456Sattilio#include <machine/cpu.h> 65220456Sattilio#endif 66220456Sattilio 67247777Sdavide#ifndef NO_EVENTTIMERS 68247777SdavideDPCPU_DECLARE(sbintime_t, hardclocktime); 69247777Sdavide#endif 70247777Sdavide 71187664SrwatsonSDT_PROVIDER_DEFINE(callout_execute); 72211616SrpauloSDT_PROBE_DEFINE(callout_execute, kernel, , callout_start, callout-start); 73187664SrwatsonSDT_PROBE_ARGTYPE(callout_execute, kernel, , callout_start, 0, 74187664Srwatson "struct callout *"); 75211616SrpauloSDT_PROBE_DEFINE(callout_execute, kernel, , callout_end, callout-end); 76187664SrwatsonSDT_PROBE_ARGTYPE(callout_execute, kernel, , callout_end, 0, 77187664Srwatson "struct callout *"); 78187664Srwatson 79247777Sdavide#ifdef CALLOUT_PROFILING 80115810Sphkstatic int avg_depth; 81115810SphkSYSCTL_INT(_debug, OID_AUTO, to_avg_depth, CTLFLAG_RD, &avg_depth, 0, 82115810Sphk "Average number of items examined per softclock call. Units = 1/1000"); 83115810Sphkstatic int avg_gcalls; 84115810SphkSYSCTL_INT(_debug, OID_AUTO, to_avg_gcalls, CTLFLAG_RD, &avg_gcalls, 0, 85115810Sphk "Average number of Giant callouts made per softclock call. Units = 1/1000"); 86173760Sattiliostatic int avg_lockcalls; 87173760SattilioSYSCTL_INT(_debug, OID_AUTO, to_avg_lockcalls, CTLFLAG_RD, &avg_lockcalls, 0, 88173760Sattilio "Average number of lock callouts made per softclock call. Units = 1/1000"); 89115810Sphkstatic int avg_mpcalls; 90115810SphkSYSCTL_INT(_debug, OID_AUTO, to_avg_mpcalls, CTLFLAG_RD, &avg_mpcalls, 0, 91115810Sphk "Average number of MP callouts made per softclock call. Units = 1/1000"); 92247777Sdavidestatic int avg_depth_dir; 93247777SdavideSYSCTL_INT(_debug, OID_AUTO, to_avg_depth_dir, CTLFLAG_RD, &avg_depth_dir, 0, 94247777Sdavide "Average number of direct callouts examined per callout_process call. " 95247777Sdavide "Units = 1/1000"); 96247777Sdavidestatic int avg_lockcalls_dir; 97247777SdavideSYSCTL_INT(_debug, OID_AUTO, to_avg_lockcalls_dir, CTLFLAG_RD, 98247777Sdavide &avg_lockcalls_dir, 0, "Average number of lock direct callouts made per " 99247777Sdavide "callout_process call. Units = 1/1000"); 100247777Sdavidestatic int avg_mpcalls_dir; 101247777SdavideSYSCTL_INT(_debug, OID_AUTO, to_avg_mpcalls_dir, CTLFLAG_RD, &avg_mpcalls_dir, 102247777Sdavide 0, "Average number of MP direct callouts made per callout_process call. " 103247777Sdavide "Units = 1/1000"); 104247777Sdavide#endif 105248031Sandre 106248031Sandrestatic int ncallout; 107248031SandreSYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0, 108248031Sandre "Number of entries in callwheel and size of timeout() preallocation"); 109248031Sandre 11033392Sphk/* 11133392Sphk * TODO: 11233392Sphk * allocate more timeout table slots when table overflows. 11333392Sphk */ 114247715Sdavideu_int callwheelsize, callwheelmask; 1152112Swollman 116200510Sluigi/* 117247777Sdavide * The callout cpu exec entities represent informations necessary for 118247777Sdavide * describing the state of callouts currently running on the CPU and the ones 119247777Sdavide * necessary for migrating callouts to the new callout cpu. In particular, 120247777Sdavide * the first entry of the array cc_exec_entity holds informations for callout 121247777Sdavide * running in SWI thread context, while the second one holds informations 122247777Sdavide * for callout running directly from hardware interrupt context. 123220456Sattilio * The cached informations are very important for deferring migration when 124220456Sattilio * the migrating callout is already running. 125220456Sattilio */ 126247777Sdavidestruct cc_exec { 127247777Sdavide struct callout *cc_next; 128247777Sdavide struct callout *cc_curr; 129220456Sattilio#ifdef SMP 130247777Sdavide void (*ce_migration_func)(void *); 131247777Sdavide void *ce_migration_arg; 132247777Sdavide int ce_migration_cpu; 133247777Sdavide sbintime_t ce_migration_time; 134220456Sattilio#endif 135247813Sdavide bool cc_cancel; 136247813Sdavide bool cc_waiting; 137220456Sattilio}; 138247467Sdavide 139220456Sattilio/* 140200510Sluigi * There is one struct callout_cpu per cpu, holding all relevant 141200510Sluigi * state for the callout processing thread on the individual CPU. 142200510Sluigi */ 143177859Sjeffstruct callout_cpu { 144242402Sattilio struct mtx_padalign cc_lock; 145247777Sdavide struct cc_exec cc_exec_entity[2]; 146177859Sjeff struct callout *cc_callout; 147247777Sdavide struct callout_list *cc_callwheel; 148247777Sdavide struct callout_tailq cc_expireq; 149247777Sdavide struct callout_slist cc_callfree; 150247777Sdavide sbintime_t cc_firstevent; 151247777Sdavide sbintime_t cc_lastscan; 152177859Sjeff void *cc_cookie; 153247777Sdavide u_int cc_bucket; 154177859Sjeff}; 155128024Scperciva 156247777Sdavide#define cc_exec_curr cc_exec_entity[0].cc_curr 157247777Sdavide#define cc_exec_next cc_exec_entity[0].cc_next 158247777Sdavide#define cc_exec_cancel cc_exec_entity[0].cc_cancel 159247777Sdavide#define cc_exec_waiting cc_exec_entity[0].cc_waiting 160247777Sdavide#define cc_exec_curr_dir cc_exec_entity[1].cc_curr 161247777Sdavide#define cc_exec_next_dir cc_exec_entity[1].cc_next 162247777Sdavide#define cc_exec_cancel_dir cc_exec_entity[1].cc_cancel 163247777Sdavide#define cc_exec_waiting_dir cc_exec_entity[1].cc_waiting 164247777Sdavide 165177859Sjeff#ifdef SMP 166247777Sdavide#define cc_migration_func cc_exec_entity[0].ce_migration_func 167247777Sdavide#define cc_migration_arg cc_exec_entity[0].ce_migration_arg 168247777Sdavide#define cc_migration_cpu cc_exec_entity[0].ce_migration_cpu 169247777Sdavide#define cc_migration_time cc_exec_entity[0].ce_migration_time 170247777Sdavide#define cc_migration_func_dir cc_exec_entity[1].ce_migration_func 171247777Sdavide#define cc_migration_arg_dir cc_exec_entity[1].ce_migration_arg 172247777Sdavide#define cc_migration_cpu_dir cc_exec_entity[1].ce_migration_cpu 173247777Sdavide#define cc_migration_time_dir cc_exec_entity[1].ce_migration_time 174220456Sattilio 175177859Sjeffstruct callout_cpu cc_cpu[MAXCPU]; 176220456Sattilio#define CPUBLOCK MAXCPU 177177859Sjeff#define CC_CPU(cpu) (&cc_cpu[(cpu)]) 178177859Sjeff#define CC_SELF() CC_CPU(PCPU_GET(cpuid)) 179177859Sjeff#else 180177859Sjeffstruct callout_cpu cc_cpu; 181177859Sjeff#define CC_CPU(cpu) &cc_cpu 182177859Sjeff#define CC_SELF() &cc_cpu 183177859Sjeff#endif 184177859Sjeff#define CC_LOCK(cc) mtx_lock_spin(&(cc)->cc_lock) 185177859Sjeff#define CC_UNLOCK(cc) mtx_unlock_spin(&(cc)->cc_lock) 186220456Sattilio#define CC_LOCK_ASSERT(cc) mtx_assert(&(cc)->cc_lock, MA_OWNED) 187177859Sjeff 188177859Sjeffstatic int timeout_cpu; 189177859Sjeff 190248032Sandrestatic void callout_cpu_init(struct callout_cpu *cc); 191247777Sdavidestatic void softclock_call_cc(struct callout *c, struct callout_cpu *cc, 192247777Sdavide#ifdef CALLOUT_PROFILING 193247777Sdavide int *mpcalls, int *lockcalls, int *gcalls, 194247777Sdavide#endif 195247777Sdavide int direct); 196247777Sdavide 197227293Sedstatic MALLOC_DEFINE(M_CALLOUT, "callout", "Callout datastructures"); 198177859Sjeff 199139831Scperciva/** 200177859Sjeff * Locked by cc_lock: 201247777Sdavide * cc_curr - If a callout is in progress, it is cc_curr. 202247777Sdavide * If cc_curr is non-NULL, threads waiting in 203177859Sjeff * callout_drain() will be woken up as soon as the 204127969Scperciva * relevant callout completes. 205247777Sdavide * cc_cancel - Changing to 1 with both callout_lock and cc_lock held 206141428Siedowse * guarantees that the current callout will not run. 207141428Siedowse * The softclock() function sets this to 0 before it 208173760Sattilio * drops callout_lock to acquire c_lock, and it calls 209155957Sjhb * the handler only if curr_cancelled is still 0 after 210247777Sdavide * cc_lock is successfully acquired. 211177859Sjeff * cc_waiting - If a thread is waiting in callout_drain(), then 212155957Sjhb * callout_wait is nonzero. Set only when 213247777Sdavide * cc_curr is non-NULL. 214127969Scperciva */ 215128024Scperciva 2161541Srgrimes/* 217247777Sdavide * Resets the execution entity tied to a specific callout cpu. 218220456Sattilio */ 219220456Sattiliostatic void 220247777Sdavidecc_cce_cleanup(struct callout_cpu *cc, int direct) 221220456Sattilio{ 222220456Sattilio 223247777Sdavide cc->cc_exec_entity[direct].cc_curr = NULL; 224247777Sdavide cc->cc_exec_entity[direct].cc_next = NULL; 225247818Sdavide cc->cc_exec_entity[direct].cc_cancel = false; 226247818Sdavide cc->cc_exec_entity[direct].cc_waiting = false; 227220456Sattilio#ifdef SMP 228247777Sdavide cc->cc_exec_entity[direct].ce_migration_cpu = CPUBLOCK; 229247777Sdavide cc->cc_exec_entity[direct].ce_migration_time = 0; 230247777Sdavide cc->cc_exec_entity[direct].ce_migration_func = NULL; 231247777Sdavide cc->cc_exec_entity[direct].ce_migration_arg = NULL; 232220456Sattilio#endif 233220456Sattilio} 234220456Sattilio 235220456Sattilio/* 236220456Sattilio * Checks if migration is requested by a specific callout cpu. 237220456Sattilio */ 238220456Sattiliostatic int 239247777Sdavidecc_cce_migrating(struct callout_cpu *cc, int direct) 240220456Sattilio{ 241220456Sattilio 242220456Sattilio#ifdef SMP 243247777Sdavide return (cc->cc_exec_entity[direct].ce_migration_cpu != CPUBLOCK); 244220456Sattilio#else 245220456Sattilio return (0); 246220456Sattilio#endif 247220456Sattilio} 248220456Sattilio 249220456Sattilio/* 250248032Sandre * Kernel low level callwheel initialization 251248032Sandre * called on cpu0 during kernel startup. 25282127Sdillon */ 253248032Sandrestatic void 254248032Sandrecallout_callwheel_init(void *dummy) 25582127Sdillon{ 256177859Sjeff struct callout_cpu *cc; 257177859Sjeff 25882127Sdillon /* 259248031Sandre * Calculate the size of the callout wheel and the preallocated 260248031Sandre * timeout() structures. 261248141Sandre * XXX: Clip callout to result of previous function of maxusers 262248141Sandre * maximum 384. This is still huge, but acceptable. 263248031Sandre */ 264248031Sandre ncallout = imin(16 + maxproc + maxfiles, 18508); 265248031Sandre TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 266248031Sandre 267248031Sandre /* 268243853Salfred * Calculate callout wheel size, should be next power of two higher 269243853Salfred * than 'ncallout'. 27082127Sdillon */ 271243853Salfred callwheelsize = 1 << fls(ncallout); 27282127Sdillon callwheelmask = callwheelsize - 1; 27382127Sdillon 274248032Sandre /* 275248032Sandre * Only cpu0 handles timeout(9) and receives a preallocation. 276248032Sandre * 277248032Sandre * XXX: Once all timeout(9) consumers are converted this can 278248032Sandre * be removed. 279248032Sandre */ 280248032Sandre timeout_cpu = PCPU_GET(cpuid); 281248032Sandre cc = CC_CPU(timeout_cpu); 282248032Sandre cc->cc_callout = malloc(ncallout * sizeof(struct callout), 283248032Sandre M_CALLOUT, M_WAITOK); 284248032Sandre callout_cpu_init(cc); 28582127Sdillon} 286248032SandreSYSINIT(callwheel_init, SI_SUB_CPU, SI_ORDER_ANY, callout_callwheel_init, NULL); 28782127Sdillon 288248032Sandre/* 289248032Sandre * Initialize the per-cpu callout structures. 290248032Sandre */ 291177859Sjeffstatic void 292177859Sjeffcallout_cpu_init(struct callout_cpu *cc) 293177859Sjeff{ 294177859Sjeff struct callout *c; 295177859Sjeff int i; 296177859Sjeff 297177859Sjeff mtx_init(&cc->cc_lock, "callout", NULL, MTX_SPIN | MTX_RECURSE); 298177859Sjeff SLIST_INIT(&cc->cc_callfree); 299248113Sdavide cc->cc_callwheel = malloc(sizeof(struct callout_list) * callwheelsize, 300248032Sandre M_CALLOUT, M_WAITOK); 301247777Sdavide for (i = 0; i < callwheelsize; i++) 302247777Sdavide LIST_INIT(&cc->cc_callwheel[i]); 303247777Sdavide TAILQ_INIT(&cc->cc_expireq); 304247777Sdavide cc->cc_firstevent = INT64_MAX; 305247777Sdavide for (i = 0; i < 2; i++) 306247777Sdavide cc_cce_cleanup(cc, i); 307248032Sandre if (cc->cc_callout == NULL) /* Only cpu0 handles timeout(9) */ 308177859Sjeff return; 309177859Sjeff for (i = 0; i < ncallout; i++) { 310177859Sjeff c = &cc->cc_callout[i]; 311177859Sjeff callout_init(c, 0); 312177859Sjeff c->c_flags = CALLOUT_LOCAL_ALLOC; 313177859Sjeff SLIST_INSERT_HEAD(&cc->cc_callfree, c, c_links.sle); 314177859Sjeff } 315177859Sjeff} 316177859Sjeff 317220456Sattilio#ifdef SMP 31882127Sdillon/* 319220456Sattilio * Switches the cpu tied to a specific callout. 320220456Sattilio * The function expects a locked incoming callout cpu and returns with 321220456Sattilio * locked outcoming callout cpu. 322220456Sattilio */ 323220456Sattiliostatic struct callout_cpu * 324220456Sattiliocallout_cpu_switch(struct callout *c, struct callout_cpu *cc, int new_cpu) 325220456Sattilio{ 326220456Sattilio struct callout_cpu *new_cc; 327220456Sattilio 328220456Sattilio MPASS(c != NULL && cc != NULL); 329220456Sattilio CC_LOCK_ASSERT(cc); 330220456Sattilio 331225057Sattilio /* 332225057Sattilio * Avoid interrupts and preemption firing after the callout cpu 333225057Sattilio * is blocked in order to avoid deadlocks as the new thread 334225057Sattilio * may be willing to acquire the callout cpu lock. 335225057Sattilio */ 336220456Sattilio c->c_cpu = CPUBLOCK; 337225057Sattilio spinlock_enter(); 338220456Sattilio CC_UNLOCK(cc); 339220456Sattilio new_cc = CC_CPU(new_cpu); 340220456Sattilio CC_LOCK(new_cc); 341225057Sattilio spinlock_exit(); 342220456Sattilio c->c_cpu = new_cpu; 343220456Sattilio return (new_cc); 344220456Sattilio} 345220456Sattilio#endif 346220456Sattilio 347220456Sattilio/* 348177859Sjeff * Start standard softclock thread. 349177859Sjeff */ 350177859Sjeffstatic void 351177859Sjeffstart_softclock(void *dummy) 352177859Sjeff{ 353177859Sjeff struct callout_cpu *cc; 354177859Sjeff#ifdef SMP 355177859Sjeff int cpu; 356177859Sjeff#endif 357177859Sjeff 358177859Sjeff cc = CC_CPU(timeout_cpu); 359177859Sjeff if (swi_add(&clk_intr_event, "clock", softclock, cc, SWI_CLOCK, 360214746Sjhb INTR_MPSAFE, &cc->cc_cookie)) 361177859Sjeff panic("died while creating standard software ithreads"); 362177859Sjeff#ifdef SMP 363209059Sjhb CPU_FOREACH(cpu) { 364177859Sjeff if (cpu == timeout_cpu) 365177859Sjeff continue; 366177859Sjeff cc = CC_CPU(cpu); 367248032Sandre cc->cc_callout = NULL; /* Only cpu0 handles timeout(9). */ 368248032Sandre callout_cpu_init(cc); 369177859Sjeff if (swi_add(NULL, "clock", softclock, cc, SWI_CLOCK, 370177859Sjeff INTR_MPSAFE, &cc->cc_cookie)) 371177859Sjeff panic("died while creating standard software ithreads"); 37282127Sdillon } 373177859Sjeff#endif 374177859Sjeff} 375177859SjeffSYSINIT(start_softclock, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softclock, NULL); 376177859Sjeff 377247777Sdavide#define CC_HASH_SHIFT 8 378247777Sdavide 379247777Sdavidestatic inline u_int 380247777Sdavidecallout_hash(sbintime_t sbt) 381247777Sdavide{ 382247777Sdavide 383247777Sdavide return (sbt >> (32 - CC_HASH_SHIFT)); 384247777Sdavide} 385247777Sdavide 386247777Sdavidestatic inline u_int 387247777Sdavidecallout_get_bucket(sbintime_t sbt) 388247777Sdavide{ 389247777Sdavide 390247777Sdavide return (callout_hash(sbt) & callwheelmask); 391247777Sdavide} 392247777Sdavide 393177859Sjeffvoid 394247777Sdavidecallout_process(sbintime_t now) 395177859Sjeff{ 396247777Sdavide struct callout *tmp, *tmpn; 397177859Sjeff struct callout_cpu *cc; 398247777Sdavide struct callout_list *sc; 399247777Sdavide sbintime_t first, last, max, tmp_max; 400247777Sdavide uint32_t lookahead; 401247777Sdavide u_int firstb, lastb, nowb; 402247777Sdavide#ifdef CALLOUT_PROFILING 403247777Sdavide int depth_dir = 0, mpcalls_dir = 0, lockcalls_dir = 0; 404247777Sdavide#endif 405177859Sjeff 406247777Sdavide cc = CC_SELF(); 407247777Sdavide mtx_lock_spin_flags(&cc->cc_lock, MTX_QUIET); 408247777Sdavide 409247777Sdavide /* Compute the buckets of the last scan and present times. */ 410247777Sdavide firstb = callout_hash(cc->cc_lastscan); 411247777Sdavide cc->cc_lastscan = now; 412247777Sdavide nowb = callout_hash(now); 413247777Sdavide 414247777Sdavide /* Compute the last bucket and minimum time of the bucket after it. */ 415247777Sdavide if (nowb == firstb) 416247777Sdavide lookahead = (SBT_1S / 16); 417247777Sdavide else if (nowb - firstb == 1) 418247777Sdavide lookahead = (SBT_1S / 8); 419247777Sdavide else 420247777Sdavide lookahead = (SBT_1S / 2); 421247777Sdavide first = last = now; 422247777Sdavide first += (lookahead / 2); 423247777Sdavide last += lookahead; 424247777Sdavide last &= (0xffffffffffffffffLLU << (32 - CC_HASH_SHIFT)); 425247777Sdavide lastb = callout_hash(last) - 1; 426247777Sdavide max = last; 427247777Sdavide 428177859Sjeff /* 429247777Sdavide * Check if we wrapped around the entire wheel from the last scan. 430247777Sdavide * In case, we need to scan entirely the wheel for pending callouts. 431177859Sjeff */ 432247777Sdavide if (lastb - firstb >= callwheelsize) { 433247777Sdavide lastb = firstb + callwheelsize - 1; 434247777Sdavide if (nowb - firstb >= callwheelsize) 435247777Sdavide nowb = lastb; 436247777Sdavide } 437247777Sdavide 438247777Sdavide /* Iterate callwheel from firstb to nowb and then up to lastb. */ 439247777Sdavide do { 440247777Sdavide sc = &cc->cc_callwheel[firstb & callwheelmask]; 441247777Sdavide tmp = LIST_FIRST(sc); 442247777Sdavide while (tmp != NULL) { 443247777Sdavide /* Run the callout if present time within allowed. */ 444247777Sdavide if (tmp->c_time <= now) { 445247777Sdavide /* 446247777Sdavide * Consumer told us the callout may be run 447247777Sdavide * directly from hardware interrupt context. 448247777Sdavide */ 449247777Sdavide if (tmp->c_flags & CALLOUT_DIRECT) { 450247777Sdavide#ifdef CALLOUT_PROFILING 451247777Sdavide ++depth_dir; 452247777Sdavide#endif 453247777Sdavide cc->cc_exec_next_dir = 454247777Sdavide LIST_NEXT(tmp, c_links.le); 455247777Sdavide cc->cc_bucket = firstb & callwheelmask; 456247777Sdavide LIST_REMOVE(tmp, c_links.le); 457247777Sdavide softclock_call_cc(tmp, cc, 458247777Sdavide#ifdef CALLOUT_PROFILING 459247777Sdavide &mpcalls_dir, &lockcalls_dir, NULL, 460247777Sdavide#endif 461247777Sdavide 1); 462247777Sdavide tmp = cc->cc_exec_next_dir; 463247777Sdavide } else { 464247777Sdavide tmpn = LIST_NEXT(tmp, c_links.le); 465247777Sdavide LIST_REMOVE(tmp, c_links.le); 466247777Sdavide TAILQ_INSERT_TAIL(&cc->cc_expireq, 467247777Sdavide tmp, c_links.tqe); 468247777Sdavide tmp->c_flags |= CALLOUT_PROCESSED; 469247777Sdavide tmp = tmpn; 470247777Sdavide } 471247777Sdavide continue; 472247777Sdavide } 473247777Sdavide /* Skip events from distant future. */ 474247777Sdavide if (tmp->c_time >= max) 475247777Sdavide goto next; 476247777Sdavide /* 477247777Sdavide * Event minimal time is bigger than present maximal 478247777Sdavide * time, so it cannot be aggregated. 479247777Sdavide */ 480247777Sdavide if (tmp->c_time > last) { 481247777Sdavide lastb = nowb; 482247777Sdavide goto next; 483247777Sdavide } 484247777Sdavide /* Update first and last time, respecting this event. */ 485247777Sdavide if (tmp->c_time < first) 486247777Sdavide first = tmp->c_time; 487247777Sdavide tmp_max = tmp->c_time + tmp->c_precision; 488247777Sdavide if (tmp_max < last) 489247777Sdavide last = tmp_max; 490247777Sdavidenext: 491247777Sdavide tmp = LIST_NEXT(tmp, c_links.le); 492180608Sjeff } 493247777Sdavide /* Proceed with the next bucket. */ 494247777Sdavide firstb++; 495247777Sdavide /* 496247777Sdavide * Stop if we looked after present time and found 497247777Sdavide * some event we can't execute at now. 498247777Sdavide * Stop if we looked far enough into the future. 499247777Sdavide */ 500247777Sdavide } while (((int)(firstb - lastb)) <= 0); 501247777Sdavide cc->cc_firstevent = last; 502247777Sdavide#ifndef NO_EVENTTIMERS 503247777Sdavide cpu_new_callout(curcpu, last, first); 504247777Sdavide#endif 505247777Sdavide#ifdef CALLOUT_PROFILING 506247777Sdavide avg_depth_dir += (depth_dir * 1000 - avg_depth_dir) >> 8; 507247777Sdavide avg_mpcalls_dir += (mpcalls_dir * 1000 - avg_mpcalls_dir) >> 8; 508247777Sdavide avg_lockcalls_dir += (lockcalls_dir * 1000 - avg_lockcalls_dir) >> 8; 509247777Sdavide#endif 510177859Sjeff mtx_unlock_spin_flags(&cc->cc_lock, MTX_QUIET); 511177859Sjeff /* 512177859Sjeff * swi_sched acquires the thread lock, so we don't want to call it 513177859Sjeff * with cc_lock held; incorrect locking order. 514177859Sjeff */ 515247777Sdavide if (!TAILQ_EMPTY(&cc->cc_expireq)) 516177859Sjeff swi_sched(cc->cc_cookie, 0); 517177859Sjeff} 518177859Sjeff 519177859Sjeffstatic struct callout_cpu * 520177859Sjeffcallout_lock(struct callout *c) 521177859Sjeff{ 522177859Sjeff struct callout_cpu *cc; 523177859Sjeff int cpu; 524177859Sjeff 525177859Sjeff for (;;) { 526177859Sjeff cpu = c->c_cpu; 527220456Sattilio#ifdef SMP 528220456Sattilio if (cpu == CPUBLOCK) { 529220456Sattilio while (c->c_cpu == CPUBLOCK) 530220456Sattilio cpu_spinwait(); 531220456Sattilio continue; 532220456Sattilio } 533220456Sattilio#endif 534177859Sjeff cc = CC_CPU(cpu); 535177859Sjeff CC_LOCK(cc); 536177859Sjeff if (cpu == c->c_cpu) 537177859Sjeff break; 538177859Sjeff CC_UNLOCK(cc); 53982127Sdillon } 540177859Sjeff return (cc); 54182127Sdillon} 54282127Sdillon 543220456Sattiliostatic void 544247777Sdavidecallout_cc_add(struct callout *c, struct callout_cpu *cc, 545247777Sdavide sbintime_t sbt, sbintime_t precision, void (*func)(void *), 546247777Sdavide void *arg, int cpu, int flags) 547220456Sattilio{ 548247777Sdavide int bucket; 549220456Sattilio 550220456Sattilio CC_LOCK_ASSERT(cc); 551247777Sdavide if (sbt < cc->cc_lastscan) 552247777Sdavide sbt = cc->cc_lastscan; 553220456Sattilio c->c_arg = arg; 554220456Sattilio c->c_flags |= (CALLOUT_ACTIVE | CALLOUT_PENDING); 555247777Sdavide if (flags & C_DIRECT_EXEC) 556247777Sdavide c->c_flags |= CALLOUT_DIRECT; 557247777Sdavide c->c_flags &= ~CALLOUT_PROCESSED; 558220456Sattilio c->c_func = func; 559247777Sdavide c->c_time = sbt; 560247777Sdavide c->c_precision = precision; 561247777Sdavide bucket = callout_get_bucket(c->c_time); 562247777Sdavide CTR3(KTR_CALLOUT, "precision set for %p: %d.%08x", 563247777Sdavide c, (int)(c->c_precision >> 32), 564247777Sdavide (u_int)(c->c_precision & 0xffffffff)); 565247777Sdavide LIST_INSERT_HEAD(&cc->cc_callwheel[bucket], c, c_links.le); 566247777Sdavide if (cc->cc_bucket == bucket) 567247777Sdavide cc->cc_exec_next_dir = c; 568247777Sdavide#ifndef NO_EVENTTIMERS 569247777Sdavide /* 570247777Sdavide * Inform the eventtimers(4) subsystem there's a new callout 571247777Sdavide * that has been inserted, but only if really required. 572247777Sdavide */ 573247777Sdavide sbt = c->c_time + c->c_precision; 574247777Sdavide if (sbt < cc->cc_firstevent) { 575247777Sdavide cc->cc_firstevent = sbt; 576247777Sdavide cpu_new_callout(cpu, sbt, c->c_time); 577220456Sattilio } 578247777Sdavide#endif 579220456Sattilio} 580220456Sattilio 581234981Skibstatic void 582234981Skibcallout_cc_del(struct callout *c, struct callout_cpu *cc) 583234981Skib{ 584234981Skib 585243901Skib if ((c->c_flags & CALLOUT_LOCAL_ALLOC) == 0) 586243901Skib return; 587243901Skib c->c_func = NULL; 588243901Skib SLIST_INSERT_HEAD(&cc->cc_callfree, c, c_links.sle); 589234981Skib} 590234981Skib 591243901Skibstatic void 592247777Sdavidesoftclock_call_cc(struct callout *c, struct callout_cpu *cc, 593247777Sdavide#ifdef CALLOUT_PROFILING 594247777Sdavide int *mpcalls, int *lockcalls, int *gcalls, 595247777Sdavide#endif 596247777Sdavide int direct) 597234981Skib{ 598234981Skib void (*c_func)(void *); 599234981Skib void *c_arg; 600234981Skib struct lock_class *class; 601234981Skib struct lock_object *c_lock; 602234981Skib int c_flags, sharedlock; 603234981Skib#ifdef SMP 604234981Skib struct callout_cpu *new_cc; 605234981Skib void (*new_func)(void *); 606234981Skib void *new_arg; 607247777Sdavide int flags, new_cpu; 608247777Sdavide sbintime_t new_time; 609234981Skib#endif 610247777Sdavide#if defined(DIAGNOSTIC) || defined(CALLOUT_PROFILING) 611247793Sdavide sbintime_t sbt1, sbt2; 612234981Skib struct timespec ts2; 613247777Sdavide static sbintime_t maxdt = 2 * SBT_1MS; /* 2 msec */ 614234981Skib static timeout_t *lastfunc; 615234981Skib#endif 616234981Skib 617243901Skib KASSERT((c->c_flags & (CALLOUT_PENDING | CALLOUT_ACTIVE)) == 618243901Skib (CALLOUT_PENDING | CALLOUT_ACTIVE), 619243901Skib ("softclock_call_cc: pend|act %p %x", c, c->c_flags)); 620234981Skib class = (c->c_lock != NULL) ? LOCK_CLASS(c->c_lock) : NULL; 621234981Skib sharedlock = (c->c_flags & CALLOUT_SHAREDLOCK) ? 0 : 1; 622234981Skib c_lock = c->c_lock; 623234981Skib c_func = c->c_func; 624234981Skib c_arg = c->c_arg; 625234981Skib c_flags = c->c_flags; 626234981Skib if (c->c_flags & CALLOUT_LOCAL_ALLOC) 627234981Skib c->c_flags = CALLOUT_LOCAL_ALLOC; 628234981Skib else 629234981Skib c->c_flags &= ~CALLOUT_PENDING; 630247777Sdavide cc->cc_exec_entity[direct].cc_curr = c; 631247818Sdavide cc->cc_exec_entity[direct].cc_cancel = false; 632234981Skib CC_UNLOCK(cc); 633234981Skib if (c_lock != NULL) { 634234981Skib class->lc_lock(c_lock, sharedlock); 635234981Skib /* 636234981Skib * The callout may have been cancelled 637234981Skib * while we switched locks. 638234981Skib */ 639247777Sdavide if (cc->cc_exec_entity[direct].cc_cancel) { 640234981Skib class->lc_unlock(c_lock); 641234981Skib goto skip; 642234981Skib } 643234981Skib /* The callout cannot be stopped now. */ 644247818Sdavide cc->cc_exec_entity[direct].cc_cancel = true; 645234981Skib if (c_lock == &Giant.lock_object) { 646247777Sdavide#ifdef CALLOUT_PROFILING 647234981Skib (*gcalls)++; 648247777Sdavide#endif 649247777Sdavide CTR3(KTR_CALLOUT, "callout giant %p func %p arg %p", 650234981Skib c, c_func, c_arg); 651234981Skib } else { 652247777Sdavide#ifdef CALLOUT_PROFILING 653234981Skib (*lockcalls)++; 654247777Sdavide#endif 655234981Skib CTR3(KTR_CALLOUT, "callout lock %p func %p arg %p", 656234981Skib c, c_func, c_arg); 657234981Skib } 658234981Skib } else { 659247777Sdavide#ifdef CALLOUT_PROFILING 660234981Skib (*mpcalls)++; 661247777Sdavide#endif 662247777Sdavide CTR3(KTR_CALLOUT, "callout %p func %p arg %p", 663234981Skib c, c_func, c_arg); 664234981Skib } 665247793Sdavide#if defined(DIAGNOSTIC) || defined(CALLOUT_PROFILING) 666247777Sdavide sbt1 = sbinuptime(); 667234981Skib#endif 668234981Skib THREAD_NO_SLEEPING(); 669234981Skib SDT_PROBE(callout_execute, kernel, , callout_start, c, 0, 0, 0, 0); 670234981Skib c_func(c_arg); 671234981Skib SDT_PROBE(callout_execute, kernel, , callout_end, c, 0, 0, 0, 0); 672234981Skib THREAD_SLEEPING_OK(); 673247793Sdavide#if defined(DIAGNOSTIC) || defined(CALLOUT_PROFILING) 674247793Sdavide sbt2 = sbinuptime(); 675247793Sdavide sbt2 -= sbt1; 676247793Sdavide if (sbt2 > maxdt) { 677247793Sdavide if (lastfunc != c_func || sbt2 > maxdt * 2) { 678247793Sdavide ts2 = sbttots(sbt2); 679234981Skib printf( 680234981Skib "Expensive timeout(9) function: %p(%p) %jd.%09ld s\n", 681234981Skib c_func, c_arg, (intmax_t)ts2.tv_sec, ts2.tv_nsec); 682234981Skib } 683247793Sdavide maxdt = sbt2; 684234981Skib lastfunc = c_func; 685234981Skib } 686234981Skib#endif 687234981Skib CTR1(KTR_CALLOUT, "callout %p finished", c); 688234981Skib if ((c_flags & CALLOUT_RETURNUNLOCKED) == 0) 689234981Skib class->lc_unlock(c_lock); 690234981Skibskip: 691234981Skib CC_LOCK(cc); 692247777Sdavide KASSERT(cc->cc_exec_entity[direct].cc_curr == c, ("mishandled cc_curr")); 693247777Sdavide cc->cc_exec_entity[direct].cc_curr = NULL; 694247777Sdavide if (cc->cc_exec_entity[direct].cc_waiting) { 695234981Skib /* 696234981Skib * There is someone waiting for the 697234981Skib * callout to complete. 698234981Skib * If the callout was scheduled for 699234981Skib * migration just cancel it. 700234981Skib */ 701247777Sdavide if (cc_cce_migrating(cc, direct)) { 702247777Sdavide cc_cce_cleanup(cc, direct); 703243912Sattilio 704243912Sattilio /* 705243912Sattilio * It should be assert here that the callout is not 706243912Sattilio * destroyed but that is not easy. 707243912Sattilio */ 708243901Skib c->c_flags &= ~CALLOUT_DFRMIGRATION; 709243901Skib } 710247818Sdavide cc->cc_exec_entity[direct].cc_waiting = false; 711234981Skib CC_UNLOCK(cc); 712247777Sdavide wakeup(&cc->cc_exec_entity[direct].cc_waiting); 713234981Skib CC_LOCK(cc); 714247777Sdavide } else if (cc_cce_migrating(cc, direct)) { 715243912Sattilio KASSERT((c_flags & CALLOUT_LOCAL_ALLOC) == 0, 716243901Skib ("Migrating legacy callout %p", c)); 717234981Skib#ifdef SMP 718234981Skib /* 719234981Skib * If the callout was scheduled for 720234981Skib * migration just perform it now. 721234981Skib */ 722247777Sdavide new_cpu = cc->cc_exec_entity[direct].ce_migration_cpu; 723247777Sdavide new_time = cc->cc_exec_entity[direct].ce_migration_time; 724247777Sdavide new_func = cc->cc_exec_entity[direct].ce_migration_func; 725247777Sdavide new_arg = cc->cc_exec_entity[direct].ce_migration_arg; 726247777Sdavide cc_cce_cleanup(cc, direct); 727234981Skib 728234981Skib /* 729243912Sattilio * It should be assert here that the callout is not destroyed 730243912Sattilio * but that is not easy. 731243912Sattilio * 732243912Sattilio * As first thing, handle deferred callout stops. 733234981Skib */ 734234981Skib if ((c->c_flags & CALLOUT_DFRMIGRATION) == 0) { 735234981Skib CTR3(KTR_CALLOUT, 736234981Skib "deferred cancelled %p func %p arg %p", 737234981Skib c, new_func, new_arg); 738234981Skib callout_cc_del(c, cc); 739243901Skib return; 740234981Skib } 741234981Skib c->c_flags &= ~CALLOUT_DFRMIGRATION; 742234981Skib 743234981Skib new_cc = callout_cpu_switch(c, cc, new_cpu); 744247777Sdavide flags = (direct) ? C_DIRECT_EXEC : 0; 745247777Sdavide callout_cc_add(c, new_cc, new_time, c->c_precision, new_func, 746247777Sdavide new_arg, new_cpu, flags); 747234981Skib CC_UNLOCK(new_cc); 748234981Skib CC_LOCK(cc); 749234981Skib#else 750234981Skib panic("migration should not happen"); 751234981Skib#endif 752234981Skib } 753243901Skib /* 754243901Skib * If the current callout is locally allocated (from 755243901Skib * timeout(9)) then put it on the freelist. 756243901Skib * 757243901Skib * Note: we need to check the cached copy of c_flags because 758243901Skib * if it was not local, then it's not safe to deref the 759243901Skib * callout pointer. 760243901Skib */ 761243901Skib KASSERT((c_flags & CALLOUT_LOCAL_ALLOC) == 0 || 762243901Skib c->c_flags == CALLOUT_LOCAL_ALLOC, 763243901Skib ("corrupted callout")); 764243912Sattilio if (c_flags & CALLOUT_LOCAL_ALLOC) 765243912Sattilio callout_cc_del(c, cc); 766234981Skib} 767234981Skib 76882127Sdillon/* 769247467Sdavide * The callout mechanism is based on the work of Adam M. Costello and 77029680Sgibbs * George Varghese, published in a technical report entitled "Redesigning 77129680Sgibbs * the BSD Callout and Timer Facilities" and modified slightly for inclusion 77229680Sgibbs * in FreeBSD by Justin T. Gibbs. The original work on the data structures 773128630Shmp * used in this implementation was published by G. Varghese and T. Lauck in 77429680Sgibbs * the paper "Hashed and Hierarchical Timing Wheels: Data Structures for 77529680Sgibbs * the Efficient Implementation of a Timer Facility" in the Proceedings of 77629680Sgibbs * the 11th ACM Annual Symposium on Operating Systems Principles, 77729680Sgibbs * Austin, Texas Nov 1987. 77829680Sgibbs */ 77932388Sphk 78029680Sgibbs/* 7811541Srgrimes * Software (low priority) clock interrupt. 7821541Srgrimes * Run periodic events from timeout queue. 7831541Srgrimes */ 7841541Srgrimesvoid 785177859Sjeffsoftclock(void *arg) 7861541Srgrimes{ 787177859Sjeff struct callout_cpu *cc; 788102936Sphk struct callout *c; 789247777Sdavide#ifdef CALLOUT_PROFILING 790247777Sdavide int depth = 0, gcalls = 0, lockcalls = 0, mpcalls = 0; 791247777Sdavide#endif 7921541Srgrimes 793177859Sjeff cc = (struct callout_cpu *)arg; 794177859Sjeff CC_LOCK(cc); 795247777Sdavide while ((c = TAILQ_FIRST(&cc->cc_expireq)) != NULL) { 796247777Sdavide TAILQ_REMOVE(&cc->cc_expireq, c, c_links.tqe); 797247777Sdavide softclock_call_cc(c, cc, 798247777Sdavide#ifdef CALLOUT_PROFILING 799247777Sdavide &mpcalls, &lockcalls, &gcalls, 800247777Sdavide#endif 801247777Sdavide 0); 802247777Sdavide#ifdef CALLOUT_PROFILING 803247777Sdavide ++depth; 804247777Sdavide#endif 8051541Srgrimes } 806247777Sdavide#ifdef CALLOUT_PROFILING 807115810Sphk avg_depth += (depth * 1000 - avg_depth) >> 8; 808115810Sphk avg_mpcalls += (mpcalls * 1000 - avg_mpcalls) >> 8; 809173760Sattilio avg_lockcalls += (lockcalls * 1000 - avg_lockcalls) >> 8; 810115810Sphk avg_gcalls += (gcalls * 1000 - avg_gcalls) >> 8; 811247777Sdavide#endif 812177859Sjeff CC_UNLOCK(cc); 8131541Srgrimes} 8141541Srgrimes 8151541Srgrimes/* 8161541Srgrimes * timeout -- 8171541Srgrimes * Execute a function after a specified length of time. 8181541Srgrimes * 8191541Srgrimes * untimeout -- 8201541Srgrimes * Cancel previous timeout function call. 8211541Srgrimes * 82229680Sgibbs * callout_handle_init -- 82329680Sgibbs * Initialize a handle so that using it with untimeout is benign. 82429680Sgibbs * 8251541Srgrimes * See AT&T BCI Driver Reference Manual for specification. This 826247698Smav * implementation differs from that one in that although an 82729680Sgibbs * identification value is returned from timeout, the original 82829680Sgibbs * arguments to timeout as well as the identifier are used to 82929680Sgibbs * identify entries for untimeout. 8301541Srgrimes */ 83129680Sgibbsstruct callout_handle 83229680Sgibbstimeout(ftn, arg, to_ticks) 83333824Sbde timeout_t *ftn; 8341541Srgrimes void *arg; 83569147Sjlemon int to_ticks; 8361541Srgrimes{ 837177859Sjeff struct callout_cpu *cc; 83829680Sgibbs struct callout *new; 83929680Sgibbs struct callout_handle handle; 8401541Srgrimes 841177859Sjeff cc = CC_CPU(timeout_cpu); 842177859Sjeff CC_LOCK(cc); 8431541Srgrimes /* Fill in the next free callout structure. */ 844177859Sjeff new = SLIST_FIRST(&cc->cc_callfree); 84529680Sgibbs if (new == NULL) 84629680Sgibbs /* XXX Attempt to malloc first */ 8471541Srgrimes panic("timeout table full"); 848177859Sjeff SLIST_REMOVE_HEAD(&cc->cc_callfree, c_links.sle); 84944510Swollman callout_reset(new, to_ticks, ftn, arg); 850177859Sjeff handle.callout = new; 851177859Sjeff CC_UNLOCK(cc); 8521541Srgrimes 85329680Sgibbs return (handle); 8541541Srgrimes} 8551541Srgrimes 8561541Srgrimesvoid 85729680Sgibbsuntimeout(ftn, arg, handle) 85833824Sbde timeout_t *ftn; 8591541Srgrimes void *arg; 86029680Sgibbs struct callout_handle handle; 8611541Srgrimes{ 862177859Sjeff struct callout_cpu *cc; 8631541Srgrimes 86429680Sgibbs /* 86529680Sgibbs * Check for a handle that was initialized 86629680Sgibbs * by callout_handle_init, but never used 86729680Sgibbs * for a real timeout. 86829680Sgibbs */ 86929680Sgibbs if (handle.callout == NULL) 87029680Sgibbs return; 87129680Sgibbs 872177859Sjeff cc = callout_lock(handle.callout); 87344510Swollman if (handle.callout->c_func == ftn && handle.callout->c_arg == arg) 87444510Swollman callout_stop(handle.callout); 875177859Sjeff CC_UNLOCK(cc); 8761541Srgrimes} 8771541Srgrimes 87824101Sbdevoid 87929680Sgibbscallout_handle_init(struct callout_handle *handle) 88029680Sgibbs{ 88129680Sgibbs handle->callout = NULL; 88229680Sgibbs} 88329680Sgibbs 88444510Swollman/* 88544510Swollman * New interface; clients allocate their own callout structures. 88644510Swollman * 88744510Swollman * callout_reset() - establish or change a timeout 88844510Swollman * callout_stop() - disestablish a timeout 88944510Swollman * callout_init() - initialize a callout structure so that it can 89044510Swollman * safely be passed to callout_reset() and callout_stop() 89144510Swollman * 89250673Sjlemon * <sys/callout.h> defines three convenience macros: 89344510Swollman * 894140487Scperciva * callout_active() - returns truth if callout has not been stopped, 895140487Scperciva * drained, or deactivated since the last time the callout was 896140487Scperciva * reset. 89750673Sjlemon * callout_pending() - returns truth if callout is still waiting for timeout 89850673Sjlemon * callout_deactivate() - marks the callout as having been serviced 89944510Swollman */ 900149879Sglebiusint 901247777Sdavidecallout_reset_sbt_on(struct callout *c, sbintime_t sbt, sbintime_t precision, 902247777Sdavide void (*ftn)(void *), void *arg, int cpu, int flags) 90344510Swollman{ 904247777Sdavide sbintime_t to_sbt, pr; 905177859Sjeff struct callout_cpu *cc; 906247777Sdavide int cancelled, direct; 90744510Swollman 908247777Sdavide cancelled = 0; 909247777Sdavide if (flags & C_ABSOLUTE) { 910247777Sdavide to_sbt = sbt; 911247777Sdavide } else { 912247777Sdavide if ((flags & C_HARDCLOCK) && (sbt < tick_sbt)) 913247777Sdavide sbt = tick_sbt; 914247777Sdavide if ((flags & C_HARDCLOCK) || 915247777Sdavide#ifdef NO_EVENTTIMERS 916247777Sdavide sbt >= sbt_timethreshold) { 917247777Sdavide to_sbt = getsbinuptime(); 918247777Sdavide 919247777Sdavide /* Add safety belt for the case of hz > 1000. */ 920247777Sdavide to_sbt += tc_tick_sbt - tick_sbt; 921247777Sdavide#else 922247777Sdavide sbt >= sbt_tickthreshold) { 923247777Sdavide /* 924247777Sdavide * Obtain the time of the last hardclock() call on 925247777Sdavide * this CPU directly from the kern_clocksource.c. 926247777Sdavide * This value is per-CPU, but it is equal for all 927247777Sdavide * active ones. 928247777Sdavide */ 929247777Sdavide#ifdef __LP64__ 930247777Sdavide to_sbt = DPCPU_GET(hardclocktime); 931247777Sdavide#else 932247777Sdavide spinlock_enter(); 933247777Sdavide to_sbt = DPCPU_GET(hardclocktime); 934247777Sdavide spinlock_exit(); 935247777Sdavide#endif 936247777Sdavide#endif 937247777Sdavide if ((flags & C_HARDCLOCK) == 0) 938247777Sdavide to_sbt += tick_sbt; 939247777Sdavide } else 940247777Sdavide to_sbt = sbinuptime(); 941247777Sdavide to_sbt += sbt; 942247777Sdavide pr = ((C_PRELGET(flags) < 0) ? sbt >> tc_precexp : 943247777Sdavide sbt >> C_PRELGET(flags)); 944247777Sdavide if (pr > precision) 945247777Sdavide precision = pr; 946247777Sdavide } 947177859Sjeff /* 948177859Sjeff * Don't allow migration of pre-allocated callouts lest they 949177859Sjeff * become unbalanced. 950177859Sjeff */ 951177859Sjeff if (c->c_flags & CALLOUT_LOCAL_ALLOC) 952177859Sjeff cpu = c->c_cpu; 953247777Sdavide direct = (c->c_flags & CALLOUT_DIRECT) != 0; 954247777Sdavide KASSERT(!direct || c->c_lock == NULL, 955247777Sdavide ("%s: direct callout %p has lock", __func__, c)); 956177859Sjeff cc = callout_lock(c); 957247777Sdavide if (cc->cc_exec_entity[direct].cc_curr == c) { 958127969Scperciva /* 959127969Scperciva * We're being asked to reschedule a callout which is 960173760Sattilio * currently in progress. If there is a lock then we 961141428Siedowse * can cancel the callout if it has not really started. 962127969Scperciva */ 963247777Sdavide if (c->c_lock != NULL && !cc->cc_exec_entity[direct].cc_cancel) 964247818Sdavide cancelled = cc->cc_exec_entity[direct].cc_cancel = true; 965247777Sdavide if (cc->cc_exec_entity[direct].cc_waiting) { 966141428Siedowse /* 967141428Siedowse * Someone has called callout_drain to kill this 968141428Siedowse * callout. Don't reschedule. 969141428Siedowse */ 970163246Sglebius CTR4(KTR_CALLOUT, "%s %p func %p arg %p", 971163246Sglebius cancelled ? "cancelled" : "failed to cancel", 972163246Sglebius c, c->c_func, c->c_arg); 973177859Sjeff CC_UNLOCK(cc); 974149879Sglebius return (cancelled); 975141428Siedowse } 976128024Scperciva } 977133190Scperciva if (c->c_flags & CALLOUT_PENDING) { 978247777Sdavide if ((c->c_flags & CALLOUT_PROCESSED) == 0) { 979247777Sdavide if (cc->cc_exec_next_dir == c) 980247777Sdavide cc->cc_exec_next_dir = LIST_NEXT(c, c_links.le); 981247777Sdavide LIST_REMOVE(c, c_links.le); 982247777Sdavide } else 983247777Sdavide TAILQ_REMOVE(&cc->cc_expireq, c, c_links.tqe); 984149879Sglebius cancelled = 1; 985177859Sjeff c->c_flags &= ~(CALLOUT_ACTIVE | CALLOUT_PENDING); 986133190Scperciva } 987220456Sattilio 988220456Sattilio#ifdef SMP 98944510Swollman /* 990220456Sattilio * If the callout must migrate try to perform it immediately. 991220456Sattilio * If the callout is currently running, just defer the migration 992220456Sattilio * to a more appropriate moment. 99344510Swollman */ 994177859Sjeff if (c->c_cpu != cpu) { 995247777Sdavide if (cc->cc_exec_entity[direct].cc_curr == c) { 996247777Sdavide cc->cc_exec_entity[direct].ce_migration_cpu = cpu; 997247777Sdavide cc->cc_exec_entity[direct].ce_migration_time 998247777Sdavide = to_sbt; 999247777Sdavide cc->cc_exec_entity[direct].ce_migration_func = ftn; 1000247777Sdavide cc->cc_exec_entity[direct].ce_migration_arg = arg; 1001234952Skib c->c_flags |= CALLOUT_DFRMIGRATION; 1002247777Sdavide CTR6(KTR_CALLOUT, 1003247777Sdavide "migration of %p func %p arg %p in %d.%08x to %u deferred", 1004247777Sdavide c, c->c_func, c->c_arg, (int)(to_sbt >> 32), 1005247777Sdavide (u_int)(to_sbt & 0xffffffff), cpu); 1006220456Sattilio CC_UNLOCK(cc); 1007220456Sattilio return (cancelled); 1008220456Sattilio } 1009220456Sattilio cc = callout_cpu_switch(c, cc, cpu); 1010177859Sjeff } 1011220456Sattilio#endif 1012177859Sjeff 1013247777Sdavide callout_cc_add(c, cc, to_sbt, precision, ftn, arg, cpu, flags); 1014247777Sdavide CTR6(KTR_CALLOUT, "%sscheduled %p func %p arg %p in %d.%08x", 1015247777Sdavide cancelled ? "re" : "", c, c->c_func, c->c_arg, (int)(to_sbt >> 32), 1016247777Sdavide (u_int)(to_sbt & 0xffffffff)); 1017177859Sjeff CC_UNLOCK(cc); 1018149879Sglebius 1019149879Sglebius return (cancelled); 102044510Swollman} 102144510Swollman 1022181191Ssam/* 1023181191Ssam * Common idioms that can be optimized in the future. 1024181191Ssam */ 102581481Sjhbint 1026181191Ssamcallout_schedule_on(struct callout *c, int to_ticks, int cpu) 1027181191Ssam{ 1028181191Ssam return callout_reset_on(c, to_ticks, c->c_func, c->c_arg, cpu); 1029181191Ssam} 1030181191Ssam 1031181191Ssamint 1032181191Ssamcallout_schedule(struct callout *c, int to_ticks) 1033181191Ssam{ 1034181191Ssam return callout_reset_on(c, to_ticks, c->c_func, c->c_arg, c->c_cpu); 1035181191Ssam} 1036181191Ssam 1037181191Ssamint 1038127969Scperciva_callout_stop_safe(c, safe) 1039127969Scperciva struct callout *c; 1040127969Scperciva int safe; 1041127969Scperciva{ 1042220456Sattilio struct callout_cpu *cc, *old_cc; 1043173760Sattilio struct lock_class *class; 1044247777Sdavide int direct, sq_locked, use_lock; 1045127969Scperciva 1046173760Sattilio /* 1047173760Sattilio * Some old subsystems don't hold Giant while running a callout_stop(), 1048173760Sattilio * so just discard this check for the moment. 1049173760Sattilio */ 1050173760Sattilio if (!safe && c->c_lock != NULL) { 1051173760Sattilio if (c->c_lock == &Giant.lock_object) 1052173760Sattilio use_lock = mtx_owned(&Giant); 1053173760Sattilio else { 1054173760Sattilio use_lock = 1; 1055173760Sattilio class = LOCK_CLASS(c->c_lock); 1056173760Sattilio class->lc_assert(c->c_lock, LA_XLOCKED); 1057173760Sattilio } 1058173760Sattilio } else 1059173760Sattilio use_lock = 0; 1060247777Sdavide direct = (c->c_flags & CALLOUT_DIRECT) != 0; 1061172025Sjhb sq_locked = 0; 1062220456Sattilio old_cc = NULL; 1063172025Sjhbagain: 1064177859Sjeff cc = callout_lock(c); 1065220456Sattilio 106644510Swollman /* 1067220456Sattilio * If the callout was migrating while the callout cpu lock was 1068220456Sattilio * dropped, just drop the sleepqueue lock and check the states 1069220456Sattilio * again. 1070220456Sattilio */ 1071220456Sattilio if (sq_locked != 0 && cc != old_cc) { 1072220456Sattilio#ifdef SMP 1073220456Sattilio CC_UNLOCK(cc); 1074247777Sdavide sleepq_release(&old_cc->cc_exec_entity[direct].cc_waiting); 1075220456Sattilio sq_locked = 0; 1076220456Sattilio old_cc = NULL; 1077220456Sattilio goto again; 1078220456Sattilio#else 1079220456Sattilio panic("migration should not happen"); 1080220456Sattilio#endif 1081220456Sattilio } 1082220456Sattilio 1083220456Sattilio /* 1084155957Sjhb * If the callout isn't pending, it's not on the queue, so 1085155957Sjhb * don't attempt to remove it from the queue. We can try to 1086155957Sjhb * stop it by other means however. 108744510Swollman */ 108844510Swollman if (!(c->c_flags & CALLOUT_PENDING)) { 108950673Sjlemon c->c_flags &= ~CALLOUT_ACTIVE; 1090155957Sjhb 1091155957Sjhb /* 1092155957Sjhb * If it wasn't on the queue and it isn't the current 1093155957Sjhb * callout, then we can't stop it, so just bail. 1094155957Sjhb */ 1095247777Sdavide if (cc->cc_exec_entity[direct].cc_curr != c) { 1096163246Sglebius CTR3(KTR_CALLOUT, "failed to stop %p func %p arg %p", 1097163246Sglebius c, c->c_func, c->c_arg); 1098177859Sjeff CC_UNLOCK(cc); 1099172025Sjhb if (sq_locked) 1100247777Sdavide sleepq_release( 1101247777Sdavide &cc->cc_exec_entity[direct].cc_waiting); 1102141428Siedowse return (0); 1103141428Siedowse } 1104155957Sjhb 1105141428Siedowse if (safe) { 1106127969Scperciva /* 1107155957Sjhb * The current callout is running (or just 1108155957Sjhb * about to run) and blocking is allowed, so 1109155957Sjhb * just wait for the current invocation to 1110155957Sjhb * finish. 1111127969Scperciva */ 1112247777Sdavide while (cc->cc_exec_entity[direct].cc_curr == c) { 1113171053Sattilio /* 1114171053Sattilio * Use direct calls to sleepqueue interface 1115171053Sattilio * instead of cv/msleep in order to avoid 1116177859Sjeff * a LOR between cc_lock and sleepqueue 1117171053Sattilio * chain spinlocks. This piece of code 1118171053Sattilio * emulates a msleep_spin() call actually. 1119172025Sjhb * 1120172025Sjhb * If we already have the sleepqueue chain 1121172025Sjhb * locked, then we can safely block. If we 1122172025Sjhb * don't already have it locked, however, 1123177859Sjeff * we have to drop the cc_lock to lock 1124172025Sjhb * it. This opens several races, so we 1125172025Sjhb * restart at the beginning once we have 1126172025Sjhb * both locks. If nothing has changed, then 1127172025Sjhb * we will end up back here with sq_locked 1128172025Sjhb * set. 1129171053Sattilio */ 1130172025Sjhb if (!sq_locked) { 1131177859Sjeff CC_UNLOCK(cc); 1132247777Sdavide sleepq_lock( 1133247777Sdavide &cc->cc_exec_entity[direct].cc_waiting); 1134172025Sjhb sq_locked = 1; 1135220456Sattilio old_cc = cc; 1136172025Sjhb goto again; 1137172025Sjhb } 1138220456Sattilio 1139220456Sattilio /* 1140220456Sattilio * Migration could be cancelled here, but 1141220456Sattilio * as long as it is still not sure when it 1142220456Sattilio * will be packed up, just let softclock() 1143220456Sattilio * take care of it. 1144220456Sattilio */ 1145247818Sdavide cc->cc_exec_entity[direct].cc_waiting = true; 1146171053Sattilio DROP_GIANT(); 1147177859Sjeff CC_UNLOCK(cc); 1148247777Sdavide sleepq_add( 1149247777Sdavide &cc->cc_exec_entity[direct].cc_waiting, 1150177859Sjeff &cc->cc_lock.lock_object, "codrain", 1151171053Sattilio SLEEPQ_SLEEP, 0); 1152247777Sdavide sleepq_wait( 1153247777Sdavide &cc->cc_exec_entity[direct].cc_waiting, 1154247777Sdavide 0); 1155172025Sjhb sq_locked = 0; 1156220456Sattilio old_cc = NULL; 1157171053Sattilio 1158171053Sattilio /* Reacquire locks previously released. */ 1159171053Sattilio PICKUP_GIANT(); 1160177859Sjeff CC_LOCK(cc); 1161155957Sjhb } 1162247777Sdavide } else if (use_lock && 1163247777Sdavide !cc->cc_exec_entity[direct].cc_cancel) { 1164155957Sjhb /* 1165173760Sattilio * The current callout is waiting for its 1166173760Sattilio * lock which we hold. Cancel the callout 1167155957Sjhb * and return. After our caller drops the 1168173760Sattilio * lock, the callout will be skipped in 1169155957Sjhb * softclock(). 1170155957Sjhb */ 1171247818Sdavide cc->cc_exec_entity[direct].cc_cancel = true; 1172163246Sglebius CTR3(KTR_CALLOUT, "cancelled %p func %p arg %p", 1173163246Sglebius c, c->c_func, c->c_arg); 1174247777Sdavide KASSERT(!cc_cce_migrating(cc, direct), 1175220456Sattilio ("callout wrongly scheduled for migration")); 1176177859Sjeff CC_UNLOCK(cc); 1177172025Sjhb KASSERT(!sq_locked, ("sleepqueue chain locked")); 1178141428Siedowse return (1); 1179234952Skib } else if ((c->c_flags & CALLOUT_DFRMIGRATION) != 0) { 1180234952Skib c->c_flags &= ~CALLOUT_DFRMIGRATION; 1181234952Skib CTR3(KTR_CALLOUT, "postponing stop %p func %p arg %p", 1182234952Skib c, c->c_func, c->c_arg); 1183234952Skib CC_UNLOCK(cc); 1184234952Skib return (1); 1185155957Sjhb } 1186163246Sglebius CTR3(KTR_CALLOUT, "failed to stop %p func %p arg %p", 1187163246Sglebius c, c->c_func, c->c_arg); 1188177859Sjeff CC_UNLOCK(cc); 1189172025Sjhb KASSERT(!sq_locked, ("sleepqueue chain still locked")); 119081481Sjhb return (0); 119144510Swollman } 1192172025Sjhb if (sq_locked) 1193247777Sdavide sleepq_release(&cc->cc_exec_entity[direct].cc_waiting); 1194172025Sjhb 119550673Sjlemon c->c_flags &= ~(CALLOUT_ACTIVE | CALLOUT_PENDING); 119644510Swollman 1197234981Skib CTR3(KTR_CALLOUT, "cancelled %p func %p arg %p", 1198234981Skib c, c->c_func, c->c_arg); 1199247777Sdavide if ((c->c_flags & CALLOUT_PROCESSED) == 0) { 1200247777Sdavide if (cc->cc_exec_next_dir == c) 1201247777Sdavide cc->cc_exec_next_dir = LIST_NEXT(c, c_links.le); 1202247777Sdavide LIST_REMOVE(c, c_links.le); 1203247777Sdavide } else 1204247777Sdavide TAILQ_REMOVE(&cc->cc_expireq, c, c_links.tqe); 1205234981Skib callout_cc_del(c, cc); 120644510Swollman 1207177859Sjeff CC_UNLOCK(cc); 120881481Sjhb return (1); 120944510Swollman} 121044510Swollman 121144510Swollmanvoid 121269147Sjlemoncallout_init(c, mpsafe) 121344510Swollman struct callout *c; 121469147Sjlemon int mpsafe; 121544510Swollman{ 121644527Swollman bzero(c, sizeof *c); 1217141428Siedowse if (mpsafe) { 1218173760Sattilio c->c_lock = NULL; 1219141428Siedowse c->c_flags = CALLOUT_RETURNUNLOCKED; 1220141428Siedowse } else { 1221173760Sattilio c->c_lock = &Giant.lock_object; 1222141428Siedowse c->c_flags = 0; 1223141428Siedowse } 1224177859Sjeff c->c_cpu = timeout_cpu; 122544510Swollman} 122644510Swollman 1227141428Siedowsevoid 1228173760Sattilio_callout_init_lock(c, lock, flags) 1229141428Siedowse struct callout *c; 1230173760Sattilio struct lock_object *lock; 1231141428Siedowse int flags; 1232141428Siedowse{ 1233141428Siedowse bzero(c, sizeof *c); 1234173760Sattilio c->c_lock = lock; 1235173760Sattilio KASSERT((flags & ~(CALLOUT_RETURNUNLOCKED | CALLOUT_SHAREDLOCK)) == 0, 1236173760Sattilio ("callout_init_lock: bad flags %d", flags)); 1237173760Sattilio KASSERT(lock != NULL || (flags & CALLOUT_RETURNUNLOCKED) == 0, 1238173760Sattilio ("callout_init_lock: CALLOUT_RETURNUNLOCKED with no lock")); 1239176013Sattilio KASSERT(lock == NULL || !(LOCK_CLASS(lock)->lc_flags & 1240176013Sattilio (LC_SPINLOCK | LC_SLEEPABLE)), ("%s: invalid lock class", 1241173760Sattilio __func__)); 1242173760Sattilio c->c_flags = flags & (CALLOUT_RETURNUNLOCKED | CALLOUT_SHAREDLOCK); 1243177859Sjeff c->c_cpu = timeout_cpu; 1244141428Siedowse} 1245141428Siedowse 124631950Snate#ifdef APM_FIXUP_CALLTODO 124731950Snate/* 124831950Snate * Adjust the kernel calltodo timeout list. This routine is used after 124931950Snate * an APM resume to recalculate the calltodo timer list values with the 125031950Snate * number of hz's we have been sleeping. The next hardclock() will detect 125131950Snate * that there are fired timers and run softclock() to execute them. 125231950Snate * 125331950Snate * Please note, I have not done an exhaustive analysis of what code this 125431950Snate * might break. I am motivated to have my select()'s and alarm()'s that 125531950Snate * have expired during suspend firing upon resume so that the applications 125631950Snate * which set the timer can do the maintanence the timer was for as close 125731950Snate * as possible to the originally intended time. Testing this code for a 125831950Snate * week showed that resuming from a suspend resulted in 22 to 25 timers 125931950Snate * firing, which seemed independant on whether the suspend was 2 hours or 126031950Snate * 2 days. Your milage may vary. - Ken Key <key@cs.utk.edu> 126131950Snate */ 126231950Snatevoid 126331950Snateadjust_timeout_calltodo(time_change) 126431950Snate struct timeval *time_change; 126531950Snate{ 126631950Snate register struct callout *p; 126731950Snate unsigned long delta_ticks; 126831950Snate 126931950Snate /* 127031950Snate * How many ticks were we asleep? 127136127Sbde * (stolen from tvtohz()). 127231950Snate */ 127331950Snate 127431950Snate /* Don't do anything */ 127531950Snate if (time_change->tv_sec < 0) 127631950Snate return; 127731950Snate else if (time_change->tv_sec <= LONG_MAX / 1000000) 127831950Snate delta_ticks = (time_change->tv_sec * 1000000 + 127931950Snate time_change->tv_usec + (tick - 1)) / tick + 1; 128031950Snate else if (time_change->tv_sec <= LONG_MAX / hz) 128131950Snate delta_ticks = time_change->tv_sec * hz + 128231950Snate (time_change->tv_usec + (tick - 1)) / tick + 1; 128331950Snate else 128431950Snate delta_ticks = LONG_MAX; 128531950Snate 128631950Snate if (delta_ticks > INT_MAX) 128731950Snate delta_ticks = INT_MAX; 128831950Snate 128931950Snate /* 129031950Snate * Now rip through the timer calltodo list looking for timers 129131950Snate * to expire. 129231950Snate */ 129331950Snate 129431950Snate /* don't collide with softclock() */ 1295177859Sjeff CC_LOCK(cc); 129631950Snate for (p = calltodo.c_next; p != NULL; p = p->c_next) { 129731950Snate p->c_time -= delta_ticks; 129831950Snate 129931950Snate /* Break if the timer had more time on it than delta_ticks */ 130031950Snate if (p->c_time > 0) 130131950Snate break; 130231950Snate 130331950Snate /* take back the ticks the timer didn't use (p->c_time <= 0) */ 130431950Snate delta_ticks = -p->c_time; 130531950Snate } 1306177859Sjeff CC_UNLOCK(cc); 130731950Snate 130831950Snate return; 130931950Snate} 131031950Snate#endif /* APM_FIXUP_CALLTODO */ 1311247777Sdavide 1312247777Sdavidestatic int 1313247777Sdavideflssbt(sbintime_t sbt) 1314247777Sdavide{ 1315247777Sdavide 1316247777Sdavide sbt += (uint64_t)sbt >> 1; 1317247777Sdavide if (sizeof(long) >= sizeof(sbintime_t)) 1318247777Sdavide return (flsl(sbt)); 1319247777Sdavide if (sbt >= SBT_1S) 1320247777Sdavide return (flsl(((uint64_t)sbt) >> 32) + 32); 1321247777Sdavide return (flsl(sbt)); 1322247777Sdavide} 1323247777Sdavide 1324247777Sdavide/* 1325247777Sdavide * Dump immediate statistic snapshot of the scheduled callouts. 1326247777Sdavide */ 1327247777Sdavidestatic int 1328247777Sdavidesysctl_kern_callout_stat(SYSCTL_HANDLER_ARGS) 1329247777Sdavide{ 1330247777Sdavide struct callout *tmp; 1331247777Sdavide struct callout_cpu *cc; 1332247777Sdavide struct callout_list *sc; 1333247777Sdavide sbintime_t maxpr, maxt, medpr, medt, now, spr, st, t; 1334247777Sdavide int ct[64], cpr[64], ccpbk[32]; 1335247777Sdavide int error, val, i, count, tcum, pcum, maxc, c, medc; 1336247777Sdavide#ifdef SMP 1337247777Sdavide int cpu; 1338247777Sdavide#endif 1339247777Sdavide 1340247777Sdavide val = 0; 1341247777Sdavide error = sysctl_handle_int(oidp, &val, 0, req); 1342247777Sdavide if (error != 0 || req->newptr == NULL) 1343247777Sdavide return (error); 1344247777Sdavide count = maxc = 0; 1345247777Sdavide st = spr = maxt = maxpr = 0; 1346247777Sdavide bzero(ccpbk, sizeof(ccpbk)); 1347247777Sdavide bzero(ct, sizeof(ct)); 1348247777Sdavide bzero(cpr, sizeof(cpr)); 1349247777Sdavide now = sbinuptime(); 1350247777Sdavide#ifdef SMP 1351247777Sdavide CPU_FOREACH(cpu) { 1352247777Sdavide cc = CC_CPU(cpu); 1353247777Sdavide#else 1354247777Sdavide cc = CC_CPU(timeout_cpu); 1355247777Sdavide#endif 1356247777Sdavide CC_LOCK(cc); 1357247777Sdavide for (i = 0; i < callwheelsize; i++) { 1358247777Sdavide sc = &cc->cc_callwheel[i]; 1359247777Sdavide c = 0; 1360247777Sdavide LIST_FOREACH(tmp, sc, c_links.le) { 1361247777Sdavide c++; 1362247777Sdavide t = tmp->c_time - now; 1363247777Sdavide if (t < 0) 1364247777Sdavide t = 0; 1365247777Sdavide st += t / SBT_1US; 1366247777Sdavide spr += tmp->c_precision / SBT_1US; 1367247777Sdavide if (t > maxt) 1368247777Sdavide maxt = t; 1369247777Sdavide if (tmp->c_precision > maxpr) 1370247777Sdavide maxpr = tmp->c_precision; 1371247777Sdavide ct[flssbt(t)]++; 1372247777Sdavide cpr[flssbt(tmp->c_precision)]++; 1373247777Sdavide } 1374247777Sdavide if (c > maxc) 1375247777Sdavide maxc = c; 1376247777Sdavide ccpbk[fls(c + c / 2)]++; 1377247777Sdavide count += c; 1378247777Sdavide } 1379247777Sdavide CC_UNLOCK(cc); 1380247777Sdavide#ifdef SMP 1381247777Sdavide } 1382247777Sdavide#endif 1383247777Sdavide 1384247777Sdavide for (i = 0, tcum = 0; i < 64 && tcum < count / 2; i++) 1385247777Sdavide tcum += ct[i]; 1386247777Sdavide medt = (i >= 2) ? (((sbintime_t)1) << (i - 2)) : 0; 1387247777Sdavide for (i = 0, pcum = 0; i < 64 && pcum < count / 2; i++) 1388247777Sdavide pcum += cpr[i]; 1389247777Sdavide medpr = (i >= 2) ? (((sbintime_t)1) << (i - 2)) : 0; 1390247777Sdavide for (i = 0, c = 0; i < 32 && c < count / 2; i++) 1391247777Sdavide c += ccpbk[i]; 1392247777Sdavide medc = (i >= 2) ? (1 << (i - 2)) : 0; 1393247777Sdavide 1394247777Sdavide printf("Scheduled callouts statistic snapshot:\n"); 1395247777Sdavide printf(" Callouts: %6d Buckets: %6d*%-3d Bucket size: 0.%06ds\n", 1396247777Sdavide count, callwheelsize, mp_ncpus, 1000000 >> CC_HASH_SHIFT); 1397247777Sdavide printf(" C/Bk: med %5d avg %6d.%06jd max %6d\n", 1398247777Sdavide medc, 1399247777Sdavide count / callwheelsize / mp_ncpus, 1400247777Sdavide (uint64_t)count * 1000000 / callwheelsize / mp_ncpus % 1000000, 1401247777Sdavide maxc); 1402247777Sdavide printf(" Time: med %5jd.%06jds avg %6jd.%06jds max %6jd.%06jds\n", 1403247777Sdavide medt / SBT_1S, (medt & 0xffffffff) * 1000000 >> 32, 1404247777Sdavide (st / count) / 1000000, (st / count) % 1000000, 1405247777Sdavide maxt / SBT_1S, (maxt & 0xffffffff) * 1000000 >> 32); 1406247777Sdavide printf(" Prec: med %5jd.%06jds avg %6jd.%06jds max %6jd.%06jds\n", 1407247777Sdavide medpr / SBT_1S, (medpr & 0xffffffff) * 1000000 >> 32, 1408247777Sdavide (spr / count) / 1000000, (spr / count) % 1000000, 1409247777Sdavide maxpr / SBT_1S, (maxpr & 0xffffffff) * 1000000 >> 32); 1410247777Sdavide printf(" Distribution: \tbuckets\t time\t tcum\t" 1411247777Sdavide " prec\t pcum\n"); 1412247777Sdavide for (i = 0, tcum = pcum = 0; i < 64; i++) { 1413247777Sdavide if (ct[i] == 0 && cpr[i] == 0) 1414247777Sdavide continue; 1415247777Sdavide t = (i != 0) ? (((sbintime_t)1) << (i - 1)) : 0; 1416247777Sdavide tcum += ct[i]; 1417247777Sdavide pcum += cpr[i]; 1418247777Sdavide printf(" %10jd.%06jds\t 2**%d\t%7d\t%7d\t%7d\t%7d\n", 1419247777Sdavide t / SBT_1S, (t & 0xffffffff) * 1000000 >> 32, 1420247777Sdavide i - 1 - (32 - CC_HASH_SHIFT), 1421247777Sdavide ct[i], tcum, cpr[i], pcum); 1422247777Sdavide } 1423247777Sdavide return (error); 1424247777Sdavide} 1425247777SdavideSYSCTL_PROC(_kern, OID_AUTO, callout_stat, 1426247777Sdavide CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 1427247777Sdavide 0, 0, sysctl_kern_callout_stat, "I", 1428247777Sdavide "Dump immediate statistic snapshot of the scheduled callouts"); 1429