kern_timeout.c revision 248032
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 248032 2013-03-08 10:37:17Z 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. 261248031Sandre */ 262248031Sandre ncallout = imin(16 + maxproc + maxfiles, 18508); 263248031Sandre TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 264248031Sandre 265248031Sandre /* 266243853Salfred * Calculate callout wheel size, should be next power of two higher 267243853Salfred * than 'ncallout'. 26882127Sdillon */ 269243853Salfred callwheelsize = 1 << fls(ncallout); 27082127Sdillon callwheelmask = callwheelsize - 1; 27182127Sdillon 272248032Sandre /* 273248032Sandre * Only cpu0 handles timeout(9) and receives a preallocation. 274248032Sandre * 275248032Sandre * XXX: Once all timeout(9) consumers are converted this can 276248032Sandre * be removed. 277248032Sandre */ 278248032Sandre timeout_cpu = PCPU_GET(cpuid); 279248032Sandre cc = CC_CPU(timeout_cpu); 280248032Sandre cc->cc_callout = malloc(ncallout * sizeof(struct callout), 281248032Sandre M_CALLOUT, M_WAITOK); 282248032Sandre callout_cpu_init(cc); 28382127Sdillon} 284248032SandreSYSINIT(callwheel_init, SI_SUB_CPU, SI_ORDER_ANY, callout_callwheel_init, NULL); 28582127Sdillon 286248032Sandre/* 287248032Sandre * Initialize the per-cpu callout structures. 288248032Sandre */ 289177859Sjeffstatic void 290177859Sjeffcallout_cpu_init(struct callout_cpu *cc) 291177859Sjeff{ 292177859Sjeff struct callout *c; 293177859Sjeff int i; 294177859Sjeff 295177859Sjeff mtx_init(&cc->cc_lock, "callout", NULL, MTX_SPIN | MTX_RECURSE); 296177859Sjeff SLIST_INIT(&cc->cc_callfree); 297248032Sandre cc->cc_callwheel = malloc(sizeof(struct callout_tailq) * callwheelsize, 298248032Sandre M_CALLOUT, M_WAITOK); 299247777Sdavide for (i = 0; i < callwheelsize; i++) 300247777Sdavide LIST_INIT(&cc->cc_callwheel[i]); 301247777Sdavide TAILQ_INIT(&cc->cc_expireq); 302247777Sdavide cc->cc_firstevent = INT64_MAX; 303247777Sdavide for (i = 0; i < 2; i++) 304247777Sdavide cc_cce_cleanup(cc, i); 305248032Sandre if (cc->cc_callout == NULL) /* Only cpu0 handles timeout(9) */ 306177859Sjeff return; 307177859Sjeff for (i = 0; i < ncallout; i++) { 308177859Sjeff c = &cc->cc_callout[i]; 309177859Sjeff callout_init(c, 0); 310177859Sjeff c->c_flags = CALLOUT_LOCAL_ALLOC; 311177859Sjeff SLIST_INSERT_HEAD(&cc->cc_callfree, c, c_links.sle); 312177859Sjeff } 313177859Sjeff} 314177859Sjeff 315220456Sattilio#ifdef SMP 31682127Sdillon/* 317220456Sattilio * Switches the cpu tied to a specific callout. 318220456Sattilio * The function expects a locked incoming callout cpu and returns with 319220456Sattilio * locked outcoming callout cpu. 320220456Sattilio */ 321220456Sattiliostatic struct callout_cpu * 322220456Sattiliocallout_cpu_switch(struct callout *c, struct callout_cpu *cc, int new_cpu) 323220456Sattilio{ 324220456Sattilio struct callout_cpu *new_cc; 325220456Sattilio 326220456Sattilio MPASS(c != NULL && cc != NULL); 327220456Sattilio CC_LOCK_ASSERT(cc); 328220456Sattilio 329225057Sattilio /* 330225057Sattilio * Avoid interrupts and preemption firing after the callout cpu 331225057Sattilio * is blocked in order to avoid deadlocks as the new thread 332225057Sattilio * may be willing to acquire the callout cpu lock. 333225057Sattilio */ 334220456Sattilio c->c_cpu = CPUBLOCK; 335225057Sattilio spinlock_enter(); 336220456Sattilio CC_UNLOCK(cc); 337220456Sattilio new_cc = CC_CPU(new_cpu); 338220456Sattilio CC_LOCK(new_cc); 339225057Sattilio spinlock_exit(); 340220456Sattilio c->c_cpu = new_cpu; 341220456Sattilio return (new_cc); 342220456Sattilio} 343220456Sattilio#endif 344220456Sattilio 345220456Sattilio/* 346177859Sjeff * Start standard softclock thread. 347177859Sjeff */ 348177859Sjeffstatic void 349177859Sjeffstart_softclock(void *dummy) 350177859Sjeff{ 351177859Sjeff struct callout_cpu *cc; 352177859Sjeff#ifdef SMP 353177859Sjeff int cpu; 354177859Sjeff#endif 355177859Sjeff 356177859Sjeff cc = CC_CPU(timeout_cpu); 357177859Sjeff if (swi_add(&clk_intr_event, "clock", softclock, cc, SWI_CLOCK, 358214746Sjhb INTR_MPSAFE, &cc->cc_cookie)) 359177859Sjeff panic("died while creating standard software ithreads"); 360177859Sjeff#ifdef SMP 361209059Sjhb CPU_FOREACH(cpu) { 362177859Sjeff if (cpu == timeout_cpu) 363177859Sjeff continue; 364177859Sjeff cc = CC_CPU(cpu); 365248032Sandre cc->cc_callout = NULL; /* Only cpu0 handles timeout(9). */ 366248032Sandre callout_cpu_init(cc); 367177859Sjeff if (swi_add(NULL, "clock", softclock, cc, SWI_CLOCK, 368177859Sjeff INTR_MPSAFE, &cc->cc_cookie)) 369177859Sjeff panic("died while creating standard software ithreads"); 37082127Sdillon } 371177859Sjeff#endif 372177859Sjeff} 373177859SjeffSYSINIT(start_softclock, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softclock, NULL); 374177859Sjeff 375247777Sdavide#define CC_HASH_SHIFT 8 376247777Sdavide 377247777Sdavidestatic inline u_int 378247777Sdavidecallout_hash(sbintime_t sbt) 379247777Sdavide{ 380247777Sdavide 381247777Sdavide return (sbt >> (32 - CC_HASH_SHIFT)); 382247777Sdavide} 383247777Sdavide 384247777Sdavidestatic inline u_int 385247777Sdavidecallout_get_bucket(sbintime_t sbt) 386247777Sdavide{ 387247777Sdavide 388247777Sdavide return (callout_hash(sbt) & callwheelmask); 389247777Sdavide} 390247777Sdavide 391177859Sjeffvoid 392247777Sdavidecallout_process(sbintime_t now) 393177859Sjeff{ 394247777Sdavide struct callout *tmp, *tmpn; 395177859Sjeff struct callout_cpu *cc; 396247777Sdavide struct callout_list *sc; 397247777Sdavide sbintime_t first, last, max, tmp_max; 398247777Sdavide uint32_t lookahead; 399247777Sdavide u_int firstb, lastb, nowb; 400247777Sdavide#ifdef CALLOUT_PROFILING 401247777Sdavide int depth_dir = 0, mpcalls_dir = 0, lockcalls_dir = 0; 402247777Sdavide#endif 403177859Sjeff 404247777Sdavide cc = CC_SELF(); 405247777Sdavide mtx_lock_spin_flags(&cc->cc_lock, MTX_QUIET); 406247777Sdavide 407247777Sdavide /* Compute the buckets of the last scan and present times. */ 408247777Sdavide firstb = callout_hash(cc->cc_lastscan); 409247777Sdavide cc->cc_lastscan = now; 410247777Sdavide nowb = callout_hash(now); 411247777Sdavide 412247777Sdavide /* Compute the last bucket and minimum time of the bucket after it. */ 413247777Sdavide if (nowb == firstb) 414247777Sdavide lookahead = (SBT_1S / 16); 415247777Sdavide else if (nowb - firstb == 1) 416247777Sdavide lookahead = (SBT_1S / 8); 417247777Sdavide else 418247777Sdavide lookahead = (SBT_1S / 2); 419247777Sdavide first = last = now; 420247777Sdavide first += (lookahead / 2); 421247777Sdavide last += lookahead; 422247777Sdavide last &= (0xffffffffffffffffLLU << (32 - CC_HASH_SHIFT)); 423247777Sdavide lastb = callout_hash(last) - 1; 424247777Sdavide max = last; 425247777Sdavide 426177859Sjeff /* 427247777Sdavide * Check if we wrapped around the entire wheel from the last scan. 428247777Sdavide * In case, we need to scan entirely the wheel for pending callouts. 429177859Sjeff */ 430247777Sdavide if (lastb - firstb >= callwheelsize) { 431247777Sdavide lastb = firstb + callwheelsize - 1; 432247777Sdavide if (nowb - firstb >= callwheelsize) 433247777Sdavide nowb = lastb; 434247777Sdavide } 435247777Sdavide 436247777Sdavide /* Iterate callwheel from firstb to nowb and then up to lastb. */ 437247777Sdavide do { 438247777Sdavide sc = &cc->cc_callwheel[firstb & callwheelmask]; 439247777Sdavide tmp = LIST_FIRST(sc); 440247777Sdavide while (tmp != NULL) { 441247777Sdavide /* Run the callout if present time within allowed. */ 442247777Sdavide if (tmp->c_time <= now) { 443247777Sdavide /* 444247777Sdavide * Consumer told us the callout may be run 445247777Sdavide * directly from hardware interrupt context. 446247777Sdavide */ 447247777Sdavide if (tmp->c_flags & CALLOUT_DIRECT) { 448247777Sdavide#ifdef CALLOUT_PROFILING 449247777Sdavide ++depth_dir; 450247777Sdavide#endif 451247777Sdavide cc->cc_exec_next_dir = 452247777Sdavide LIST_NEXT(tmp, c_links.le); 453247777Sdavide cc->cc_bucket = firstb & callwheelmask; 454247777Sdavide LIST_REMOVE(tmp, c_links.le); 455247777Sdavide softclock_call_cc(tmp, cc, 456247777Sdavide#ifdef CALLOUT_PROFILING 457247777Sdavide &mpcalls_dir, &lockcalls_dir, NULL, 458247777Sdavide#endif 459247777Sdavide 1); 460247777Sdavide tmp = cc->cc_exec_next_dir; 461247777Sdavide } else { 462247777Sdavide tmpn = LIST_NEXT(tmp, c_links.le); 463247777Sdavide LIST_REMOVE(tmp, c_links.le); 464247777Sdavide TAILQ_INSERT_TAIL(&cc->cc_expireq, 465247777Sdavide tmp, c_links.tqe); 466247777Sdavide tmp->c_flags |= CALLOUT_PROCESSED; 467247777Sdavide tmp = tmpn; 468247777Sdavide } 469247777Sdavide continue; 470247777Sdavide } 471247777Sdavide /* Skip events from distant future. */ 472247777Sdavide if (tmp->c_time >= max) 473247777Sdavide goto next; 474247777Sdavide /* 475247777Sdavide * Event minimal time is bigger than present maximal 476247777Sdavide * time, so it cannot be aggregated. 477247777Sdavide */ 478247777Sdavide if (tmp->c_time > last) { 479247777Sdavide lastb = nowb; 480247777Sdavide goto next; 481247777Sdavide } 482247777Sdavide /* Update first and last time, respecting this event. */ 483247777Sdavide if (tmp->c_time < first) 484247777Sdavide first = tmp->c_time; 485247777Sdavide tmp_max = tmp->c_time + tmp->c_precision; 486247777Sdavide if (tmp_max < last) 487247777Sdavide last = tmp_max; 488247777Sdavidenext: 489247777Sdavide tmp = LIST_NEXT(tmp, c_links.le); 490180608Sjeff } 491247777Sdavide /* Proceed with the next bucket. */ 492247777Sdavide firstb++; 493247777Sdavide /* 494247777Sdavide * Stop if we looked after present time and found 495247777Sdavide * some event we can't execute at now. 496247777Sdavide * Stop if we looked far enough into the future. 497247777Sdavide */ 498247777Sdavide } while (((int)(firstb - lastb)) <= 0); 499247777Sdavide cc->cc_firstevent = last; 500247777Sdavide#ifndef NO_EVENTTIMERS 501247777Sdavide cpu_new_callout(curcpu, last, first); 502247777Sdavide#endif 503247777Sdavide#ifdef CALLOUT_PROFILING 504247777Sdavide avg_depth_dir += (depth_dir * 1000 - avg_depth_dir) >> 8; 505247777Sdavide avg_mpcalls_dir += (mpcalls_dir * 1000 - avg_mpcalls_dir) >> 8; 506247777Sdavide avg_lockcalls_dir += (lockcalls_dir * 1000 - avg_lockcalls_dir) >> 8; 507247777Sdavide#endif 508177859Sjeff mtx_unlock_spin_flags(&cc->cc_lock, MTX_QUIET); 509177859Sjeff /* 510177859Sjeff * swi_sched acquires the thread lock, so we don't want to call it 511177859Sjeff * with cc_lock held; incorrect locking order. 512177859Sjeff */ 513247777Sdavide if (!TAILQ_EMPTY(&cc->cc_expireq)) 514177859Sjeff swi_sched(cc->cc_cookie, 0); 515177859Sjeff} 516177859Sjeff 517177859Sjeffstatic struct callout_cpu * 518177859Sjeffcallout_lock(struct callout *c) 519177859Sjeff{ 520177859Sjeff struct callout_cpu *cc; 521177859Sjeff int cpu; 522177859Sjeff 523177859Sjeff for (;;) { 524177859Sjeff cpu = c->c_cpu; 525220456Sattilio#ifdef SMP 526220456Sattilio if (cpu == CPUBLOCK) { 527220456Sattilio while (c->c_cpu == CPUBLOCK) 528220456Sattilio cpu_spinwait(); 529220456Sattilio continue; 530220456Sattilio } 531220456Sattilio#endif 532177859Sjeff cc = CC_CPU(cpu); 533177859Sjeff CC_LOCK(cc); 534177859Sjeff if (cpu == c->c_cpu) 535177859Sjeff break; 536177859Sjeff CC_UNLOCK(cc); 53782127Sdillon } 538177859Sjeff return (cc); 53982127Sdillon} 54082127Sdillon 541220456Sattiliostatic void 542247777Sdavidecallout_cc_add(struct callout *c, struct callout_cpu *cc, 543247777Sdavide sbintime_t sbt, sbintime_t precision, void (*func)(void *), 544247777Sdavide void *arg, int cpu, int flags) 545220456Sattilio{ 546247777Sdavide int bucket; 547220456Sattilio 548220456Sattilio CC_LOCK_ASSERT(cc); 549247777Sdavide if (sbt < cc->cc_lastscan) 550247777Sdavide sbt = cc->cc_lastscan; 551220456Sattilio c->c_arg = arg; 552220456Sattilio c->c_flags |= (CALLOUT_ACTIVE | CALLOUT_PENDING); 553247777Sdavide if (flags & C_DIRECT_EXEC) 554247777Sdavide c->c_flags |= CALLOUT_DIRECT; 555247777Sdavide c->c_flags &= ~CALLOUT_PROCESSED; 556220456Sattilio c->c_func = func; 557247777Sdavide c->c_time = sbt; 558247777Sdavide c->c_precision = precision; 559247777Sdavide bucket = callout_get_bucket(c->c_time); 560247777Sdavide CTR3(KTR_CALLOUT, "precision set for %p: %d.%08x", 561247777Sdavide c, (int)(c->c_precision >> 32), 562247777Sdavide (u_int)(c->c_precision & 0xffffffff)); 563247777Sdavide LIST_INSERT_HEAD(&cc->cc_callwheel[bucket], c, c_links.le); 564247777Sdavide if (cc->cc_bucket == bucket) 565247777Sdavide cc->cc_exec_next_dir = c; 566247777Sdavide#ifndef NO_EVENTTIMERS 567247777Sdavide /* 568247777Sdavide * Inform the eventtimers(4) subsystem there's a new callout 569247777Sdavide * that has been inserted, but only if really required. 570247777Sdavide */ 571247777Sdavide sbt = c->c_time + c->c_precision; 572247777Sdavide if (sbt < cc->cc_firstevent) { 573247777Sdavide cc->cc_firstevent = sbt; 574247777Sdavide cpu_new_callout(cpu, sbt, c->c_time); 575220456Sattilio } 576247777Sdavide#endif 577220456Sattilio} 578220456Sattilio 579234981Skibstatic void 580234981Skibcallout_cc_del(struct callout *c, struct callout_cpu *cc) 581234981Skib{ 582234981Skib 583243901Skib if ((c->c_flags & CALLOUT_LOCAL_ALLOC) == 0) 584243901Skib return; 585243901Skib c->c_func = NULL; 586243901Skib SLIST_INSERT_HEAD(&cc->cc_callfree, c, c_links.sle); 587234981Skib} 588234981Skib 589243901Skibstatic void 590247777Sdavidesoftclock_call_cc(struct callout *c, struct callout_cpu *cc, 591247777Sdavide#ifdef CALLOUT_PROFILING 592247777Sdavide int *mpcalls, int *lockcalls, int *gcalls, 593247777Sdavide#endif 594247777Sdavide int direct) 595234981Skib{ 596234981Skib void (*c_func)(void *); 597234981Skib void *c_arg; 598234981Skib struct lock_class *class; 599234981Skib struct lock_object *c_lock; 600234981Skib int c_flags, sharedlock; 601234981Skib#ifdef SMP 602234981Skib struct callout_cpu *new_cc; 603234981Skib void (*new_func)(void *); 604234981Skib void *new_arg; 605247777Sdavide int flags, new_cpu; 606247777Sdavide sbintime_t new_time; 607234981Skib#endif 608247777Sdavide#if defined(DIAGNOSTIC) || defined(CALLOUT_PROFILING) 609247793Sdavide sbintime_t sbt1, sbt2; 610234981Skib struct timespec ts2; 611247777Sdavide static sbintime_t maxdt = 2 * SBT_1MS; /* 2 msec */ 612234981Skib static timeout_t *lastfunc; 613234981Skib#endif 614234981Skib 615243901Skib KASSERT((c->c_flags & (CALLOUT_PENDING | CALLOUT_ACTIVE)) == 616243901Skib (CALLOUT_PENDING | CALLOUT_ACTIVE), 617243901Skib ("softclock_call_cc: pend|act %p %x", c, c->c_flags)); 618234981Skib class = (c->c_lock != NULL) ? LOCK_CLASS(c->c_lock) : NULL; 619234981Skib sharedlock = (c->c_flags & CALLOUT_SHAREDLOCK) ? 0 : 1; 620234981Skib c_lock = c->c_lock; 621234981Skib c_func = c->c_func; 622234981Skib c_arg = c->c_arg; 623234981Skib c_flags = c->c_flags; 624234981Skib if (c->c_flags & CALLOUT_LOCAL_ALLOC) 625234981Skib c->c_flags = CALLOUT_LOCAL_ALLOC; 626234981Skib else 627234981Skib c->c_flags &= ~CALLOUT_PENDING; 628247777Sdavide cc->cc_exec_entity[direct].cc_curr = c; 629247818Sdavide cc->cc_exec_entity[direct].cc_cancel = false; 630234981Skib CC_UNLOCK(cc); 631234981Skib if (c_lock != NULL) { 632234981Skib class->lc_lock(c_lock, sharedlock); 633234981Skib /* 634234981Skib * The callout may have been cancelled 635234981Skib * while we switched locks. 636234981Skib */ 637247777Sdavide if (cc->cc_exec_entity[direct].cc_cancel) { 638234981Skib class->lc_unlock(c_lock); 639234981Skib goto skip; 640234981Skib } 641234981Skib /* The callout cannot be stopped now. */ 642247818Sdavide cc->cc_exec_entity[direct].cc_cancel = true; 643234981Skib if (c_lock == &Giant.lock_object) { 644247777Sdavide#ifdef CALLOUT_PROFILING 645234981Skib (*gcalls)++; 646247777Sdavide#endif 647247777Sdavide CTR3(KTR_CALLOUT, "callout giant %p func %p arg %p", 648234981Skib c, c_func, c_arg); 649234981Skib } else { 650247777Sdavide#ifdef CALLOUT_PROFILING 651234981Skib (*lockcalls)++; 652247777Sdavide#endif 653234981Skib CTR3(KTR_CALLOUT, "callout lock %p func %p arg %p", 654234981Skib c, c_func, c_arg); 655234981Skib } 656234981Skib } else { 657247777Sdavide#ifdef CALLOUT_PROFILING 658234981Skib (*mpcalls)++; 659247777Sdavide#endif 660247777Sdavide CTR3(KTR_CALLOUT, "callout %p func %p arg %p", 661234981Skib c, c_func, c_arg); 662234981Skib } 663247793Sdavide#if defined(DIAGNOSTIC) || defined(CALLOUT_PROFILING) 664247777Sdavide sbt1 = sbinuptime(); 665234981Skib#endif 666234981Skib THREAD_NO_SLEEPING(); 667234981Skib SDT_PROBE(callout_execute, kernel, , callout_start, c, 0, 0, 0, 0); 668234981Skib c_func(c_arg); 669234981Skib SDT_PROBE(callout_execute, kernel, , callout_end, c, 0, 0, 0, 0); 670234981Skib THREAD_SLEEPING_OK(); 671247793Sdavide#if defined(DIAGNOSTIC) || defined(CALLOUT_PROFILING) 672247793Sdavide sbt2 = sbinuptime(); 673247793Sdavide sbt2 -= sbt1; 674247793Sdavide if (sbt2 > maxdt) { 675247793Sdavide if (lastfunc != c_func || sbt2 > maxdt * 2) { 676247793Sdavide ts2 = sbttots(sbt2); 677234981Skib printf( 678234981Skib "Expensive timeout(9) function: %p(%p) %jd.%09ld s\n", 679234981Skib c_func, c_arg, (intmax_t)ts2.tv_sec, ts2.tv_nsec); 680234981Skib } 681247793Sdavide maxdt = sbt2; 682234981Skib lastfunc = c_func; 683234981Skib } 684234981Skib#endif 685234981Skib CTR1(KTR_CALLOUT, "callout %p finished", c); 686234981Skib if ((c_flags & CALLOUT_RETURNUNLOCKED) == 0) 687234981Skib class->lc_unlock(c_lock); 688234981Skibskip: 689234981Skib CC_LOCK(cc); 690247777Sdavide KASSERT(cc->cc_exec_entity[direct].cc_curr == c, ("mishandled cc_curr")); 691247777Sdavide cc->cc_exec_entity[direct].cc_curr = NULL; 692247777Sdavide if (cc->cc_exec_entity[direct].cc_waiting) { 693234981Skib /* 694234981Skib * There is someone waiting for the 695234981Skib * callout to complete. 696234981Skib * If the callout was scheduled for 697234981Skib * migration just cancel it. 698234981Skib */ 699247777Sdavide if (cc_cce_migrating(cc, direct)) { 700247777Sdavide cc_cce_cleanup(cc, direct); 701243912Sattilio 702243912Sattilio /* 703243912Sattilio * It should be assert here that the callout is not 704243912Sattilio * destroyed but that is not easy. 705243912Sattilio */ 706243901Skib c->c_flags &= ~CALLOUT_DFRMIGRATION; 707243901Skib } 708247818Sdavide cc->cc_exec_entity[direct].cc_waiting = false; 709234981Skib CC_UNLOCK(cc); 710247777Sdavide wakeup(&cc->cc_exec_entity[direct].cc_waiting); 711234981Skib CC_LOCK(cc); 712247777Sdavide } else if (cc_cce_migrating(cc, direct)) { 713243912Sattilio KASSERT((c_flags & CALLOUT_LOCAL_ALLOC) == 0, 714243901Skib ("Migrating legacy callout %p", c)); 715234981Skib#ifdef SMP 716234981Skib /* 717234981Skib * If the callout was scheduled for 718234981Skib * migration just perform it now. 719234981Skib */ 720247777Sdavide new_cpu = cc->cc_exec_entity[direct].ce_migration_cpu; 721247777Sdavide new_time = cc->cc_exec_entity[direct].ce_migration_time; 722247777Sdavide new_func = cc->cc_exec_entity[direct].ce_migration_func; 723247777Sdavide new_arg = cc->cc_exec_entity[direct].ce_migration_arg; 724247777Sdavide cc_cce_cleanup(cc, direct); 725234981Skib 726234981Skib /* 727243912Sattilio * It should be assert here that the callout is not destroyed 728243912Sattilio * but that is not easy. 729243912Sattilio * 730243912Sattilio * As first thing, handle deferred callout stops. 731234981Skib */ 732234981Skib if ((c->c_flags & CALLOUT_DFRMIGRATION) == 0) { 733234981Skib CTR3(KTR_CALLOUT, 734234981Skib "deferred cancelled %p func %p arg %p", 735234981Skib c, new_func, new_arg); 736234981Skib callout_cc_del(c, cc); 737243901Skib return; 738234981Skib } 739234981Skib c->c_flags &= ~CALLOUT_DFRMIGRATION; 740234981Skib 741234981Skib new_cc = callout_cpu_switch(c, cc, new_cpu); 742247777Sdavide flags = (direct) ? C_DIRECT_EXEC : 0; 743247777Sdavide callout_cc_add(c, new_cc, new_time, c->c_precision, new_func, 744247777Sdavide new_arg, new_cpu, flags); 745234981Skib CC_UNLOCK(new_cc); 746234981Skib CC_LOCK(cc); 747234981Skib#else 748234981Skib panic("migration should not happen"); 749234981Skib#endif 750234981Skib } 751243901Skib /* 752243901Skib * If the current callout is locally allocated (from 753243901Skib * timeout(9)) then put it on the freelist. 754243901Skib * 755243901Skib * Note: we need to check the cached copy of c_flags because 756243901Skib * if it was not local, then it's not safe to deref the 757243901Skib * callout pointer. 758243901Skib */ 759243901Skib KASSERT((c_flags & CALLOUT_LOCAL_ALLOC) == 0 || 760243901Skib c->c_flags == CALLOUT_LOCAL_ALLOC, 761243901Skib ("corrupted callout")); 762243912Sattilio if (c_flags & CALLOUT_LOCAL_ALLOC) 763243912Sattilio callout_cc_del(c, cc); 764234981Skib} 765234981Skib 76682127Sdillon/* 767247467Sdavide * The callout mechanism is based on the work of Adam M. Costello and 76829680Sgibbs * George Varghese, published in a technical report entitled "Redesigning 76929680Sgibbs * the BSD Callout and Timer Facilities" and modified slightly for inclusion 77029680Sgibbs * in FreeBSD by Justin T. Gibbs. The original work on the data structures 771128630Shmp * used in this implementation was published by G. Varghese and T. Lauck in 77229680Sgibbs * the paper "Hashed and Hierarchical Timing Wheels: Data Structures for 77329680Sgibbs * the Efficient Implementation of a Timer Facility" in the Proceedings of 77429680Sgibbs * the 11th ACM Annual Symposium on Operating Systems Principles, 77529680Sgibbs * Austin, Texas Nov 1987. 77629680Sgibbs */ 77732388Sphk 77829680Sgibbs/* 7791541Srgrimes * Software (low priority) clock interrupt. 7801541Srgrimes * Run periodic events from timeout queue. 7811541Srgrimes */ 7821541Srgrimesvoid 783177859Sjeffsoftclock(void *arg) 7841541Srgrimes{ 785177859Sjeff struct callout_cpu *cc; 786102936Sphk struct callout *c; 787247777Sdavide#ifdef CALLOUT_PROFILING 788247777Sdavide int depth = 0, gcalls = 0, lockcalls = 0, mpcalls = 0; 789247777Sdavide#endif 7901541Srgrimes 791177859Sjeff cc = (struct callout_cpu *)arg; 792177859Sjeff CC_LOCK(cc); 793247777Sdavide while ((c = TAILQ_FIRST(&cc->cc_expireq)) != NULL) { 794247777Sdavide TAILQ_REMOVE(&cc->cc_expireq, c, c_links.tqe); 795247777Sdavide softclock_call_cc(c, cc, 796247777Sdavide#ifdef CALLOUT_PROFILING 797247777Sdavide &mpcalls, &lockcalls, &gcalls, 798247777Sdavide#endif 799247777Sdavide 0); 800247777Sdavide#ifdef CALLOUT_PROFILING 801247777Sdavide ++depth; 802247777Sdavide#endif 8031541Srgrimes } 804247777Sdavide#ifdef CALLOUT_PROFILING 805115810Sphk avg_depth += (depth * 1000 - avg_depth) >> 8; 806115810Sphk avg_mpcalls += (mpcalls * 1000 - avg_mpcalls) >> 8; 807173760Sattilio avg_lockcalls += (lockcalls * 1000 - avg_lockcalls) >> 8; 808115810Sphk avg_gcalls += (gcalls * 1000 - avg_gcalls) >> 8; 809247777Sdavide#endif 810177859Sjeff CC_UNLOCK(cc); 8111541Srgrimes} 8121541Srgrimes 8131541Srgrimes/* 8141541Srgrimes * timeout -- 8151541Srgrimes * Execute a function after a specified length of time. 8161541Srgrimes * 8171541Srgrimes * untimeout -- 8181541Srgrimes * Cancel previous timeout function call. 8191541Srgrimes * 82029680Sgibbs * callout_handle_init -- 82129680Sgibbs * Initialize a handle so that using it with untimeout is benign. 82229680Sgibbs * 8231541Srgrimes * See AT&T BCI Driver Reference Manual for specification. This 824247698Smav * implementation differs from that one in that although an 82529680Sgibbs * identification value is returned from timeout, the original 82629680Sgibbs * arguments to timeout as well as the identifier are used to 82729680Sgibbs * identify entries for untimeout. 8281541Srgrimes */ 82929680Sgibbsstruct callout_handle 83029680Sgibbstimeout(ftn, arg, to_ticks) 83133824Sbde timeout_t *ftn; 8321541Srgrimes void *arg; 83369147Sjlemon int to_ticks; 8341541Srgrimes{ 835177859Sjeff struct callout_cpu *cc; 83629680Sgibbs struct callout *new; 83729680Sgibbs struct callout_handle handle; 8381541Srgrimes 839177859Sjeff cc = CC_CPU(timeout_cpu); 840177859Sjeff CC_LOCK(cc); 8411541Srgrimes /* Fill in the next free callout structure. */ 842177859Sjeff new = SLIST_FIRST(&cc->cc_callfree); 84329680Sgibbs if (new == NULL) 84429680Sgibbs /* XXX Attempt to malloc first */ 8451541Srgrimes panic("timeout table full"); 846177859Sjeff SLIST_REMOVE_HEAD(&cc->cc_callfree, c_links.sle); 84744510Swollman callout_reset(new, to_ticks, ftn, arg); 848177859Sjeff handle.callout = new; 849177859Sjeff CC_UNLOCK(cc); 8501541Srgrimes 85129680Sgibbs return (handle); 8521541Srgrimes} 8531541Srgrimes 8541541Srgrimesvoid 85529680Sgibbsuntimeout(ftn, arg, handle) 85633824Sbde timeout_t *ftn; 8571541Srgrimes void *arg; 85829680Sgibbs struct callout_handle handle; 8591541Srgrimes{ 860177859Sjeff struct callout_cpu *cc; 8611541Srgrimes 86229680Sgibbs /* 86329680Sgibbs * Check for a handle that was initialized 86429680Sgibbs * by callout_handle_init, but never used 86529680Sgibbs * for a real timeout. 86629680Sgibbs */ 86729680Sgibbs if (handle.callout == NULL) 86829680Sgibbs return; 86929680Sgibbs 870177859Sjeff cc = callout_lock(handle.callout); 87144510Swollman if (handle.callout->c_func == ftn && handle.callout->c_arg == arg) 87244510Swollman callout_stop(handle.callout); 873177859Sjeff CC_UNLOCK(cc); 8741541Srgrimes} 8751541Srgrimes 87624101Sbdevoid 87729680Sgibbscallout_handle_init(struct callout_handle *handle) 87829680Sgibbs{ 87929680Sgibbs handle->callout = NULL; 88029680Sgibbs} 88129680Sgibbs 88244510Swollman/* 88344510Swollman * New interface; clients allocate their own callout structures. 88444510Swollman * 88544510Swollman * callout_reset() - establish or change a timeout 88644510Swollman * callout_stop() - disestablish a timeout 88744510Swollman * callout_init() - initialize a callout structure so that it can 88844510Swollman * safely be passed to callout_reset() and callout_stop() 88944510Swollman * 89050673Sjlemon * <sys/callout.h> defines three convenience macros: 89144510Swollman * 892140487Scperciva * callout_active() - returns truth if callout has not been stopped, 893140487Scperciva * drained, or deactivated since the last time the callout was 894140487Scperciva * reset. 89550673Sjlemon * callout_pending() - returns truth if callout is still waiting for timeout 89650673Sjlemon * callout_deactivate() - marks the callout as having been serviced 89744510Swollman */ 898149879Sglebiusint 899247777Sdavidecallout_reset_sbt_on(struct callout *c, sbintime_t sbt, sbintime_t precision, 900247777Sdavide void (*ftn)(void *), void *arg, int cpu, int flags) 90144510Swollman{ 902247777Sdavide sbintime_t to_sbt, pr; 903177859Sjeff struct callout_cpu *cc; 904247777Sdavide int cancelled, direct; 90544510Swollman 906247777Sdavide cancelled = 0; 907247777Sdavide if (flags & C_ABSOLUTE) { 908247777Sdavide to_sbt = sbt; 909247777Sdavide } else { 910247777Sdavide if ((flags & C_HARDCLOCK) && (sbt < tick_sbt)) 911247777Sdavide sbt = tick_sbt; 912247777Sdavide if ((flags & C_HARDCLOCK) || 913247777Sdavide#ifdef NO_EVENTTIMERS 914247777Sdavide sbt >= sbt_timethreshold) { 915247777Sdavide to_sbt = getsbinuptime(); 916247777Sdavide 917247777Sdavide /* Add safety belt for the case of hz > 1000. */ 918247777Sdavide to_sbt += tc_tick_sbt - tick_sbt; 919247777Sdavide#else 920247777Sdavide sbt >= sbt_tickthreshold) { 921247777Sdavide /* 922247777Sdavide * Obtain the time of the last hardclock() call on 923247777Sdavide * this CPU directly from the kern_clocksource.c. 924247777Sdavide * This value is per-CPU, but it is equal for all 925247777Sdavide * active ones. 926247777Sdavide */ 927247777Sdavide#ifdef __LP64__ 928247777Sdavide to_sbt = DPCPU_GET(hardclocktime); 929247777Sdavide#else 930247777Sdavide spinlock_enter(); 931247777Sdavide to_sbt = DPCPU_GET(hardclocktime); 932247777Sdavide spinlock_exit(); 933247777Sdavide#endif 934247777Sdavide#endif 935247777Sdavide if ((flags & C_HARDCLOCK) == 0) 936247777Sdavide to_sbt += tick_sbt; 937247777Sdavide } else 938247777Sdavide to_sbt = sbinuptime(); 939247777Sdavide to_sbt += sbt; 940247777Sdavide pr = ((C_PRELGET(flags) < 0) ? sbt >> tc_precexp : 941247777Sdavide sbt >> C_PRELGET(flags)); 942247777Sdavide if (pr > precision) 943247777Sdavide precision = pr; 944247777Sdavide } 945177859Sjeff /* 946177859Sjeff * Don't allow migration of pre-allocated callouts lest they 947177859Sjeff * become unbalanced. 948177859Sjeff */ 949177859Sjeff if (c->c_flags & CALLOUT_LOCAL_ALLOC) 950177859Sjeff cpu = c->c_cpu; 951247777Sdavide direct = (c->c_flags & CALLOUT_DIRECT) != 0; 952247777Sdavide KASSERT(!direct || c->c_lock == NULL, 953247777Sdavide ("%s: direct callout %p has lock", __func__, c)); 954177859Sjeff cc = callout_lock(c); 955247777Sdavide if (cc->cc_exec_entity[direct].cc_curr == c) { 956127969Scperciva /* 957127969Scperciva * We're being asked to reschedule a callout which is 958173760Sattilio * currently in progress. If there is a lock then we 959141428Siedowse * can cancel the callout if it has not really started. 960127969Scperciva */ 961247777Sdavide if (c->c_lock != NULL && !cc->cc_exec_entity[direct].cc_cancel) 962247818Sdavide cancelled = cc->cc_exec_entity[direct].cc_cancel = true; 963247777Sdavide if (cc->cc_exec_entity[direct].cc_waiting) { 964141428Siedowse /* 965141428Siedowse * Someone has called callout_drain to kill this 966141428Siedowse * callout. Don't reschedule. 967141428Siedowse */ 968163246Sglebius CTR4(KTR_CALLOUT, "%s %p func %p arg %p", 969163246Sglebius cancelled ? "cancelled" : "failed to cancel", 970163246Sglebius c, c->c_func, c->c_arg); 971177859Sjeff CC_UNLOCK(cc); 972149879Sglebius return (cancelled); 973141428Siedowse } 974128024Scperciva } 975133190Scperciva if (c->c_flags & CALLOUT_PENDING) { 976247777Sdavide if ((c->c_flags & CALLOUT_PROCESSED) == 0) { 977247777Sdavide if (cc->cc_exec_next_dir == c) 978247777Sdavide cc->cc_exec_next_dir = LIST_NEXT(c, c_links.le); 979247777Sdavide LIST_REMOVE(c, c_links.le); 980247777Sdavide } else 981247777Sdavide TAILQ_REMOVE(&cc->cc_expireq, c, c_links.tqe); 982149879Sglebius cancelled = 1; 983177859Sjeff c->c_flags &= ~(CALLOUT_ACTIVE | CALLOUT_PENDING); 984133190Scperciva } 985220456Sattilio 986220456Sattilio#ifdef SMP 98744510Swollman /* 988220456Sattilio * If the callout must migrate try to perform it immediately. 989220456Sattilio * If the callout is currently running, just defer the migration 990220456Sattilio * to a more appropriate moment. 99144510Swollman */ 992177859Sjeff if (c->c_cpu != cpu) { 993247777Sdavide if (cc->cc_exec_entity[direct].cc_curr == c) { 994247777Sdavide cc->cc_exec_entity[direct].ce_migration_cpu = cpu; 995247777Sdavide cc->cc_exec_entity[direct].ce_migration_time 996247777Sdavide = to_sbt; 997247777Sdavide cc->cc_exec_entity[direct].ce_migration_func = ftn; 998247777Sdavide cc->cc_exec_entity[direct].ce_migration_arg = arg; 999234952Skib c->c_flags |= CALLOUT_DFRMIGRATION; 1000247777Sdavide CTR6(KTR_CALLOUT, 1001247777Sdavide "migration of %p func %p arg %p in %d.%08x to %u deferred", 1002247777Sdavide c, c->c_func, c->c_arg, (int)(to_sbt >> 32), 1003247777Sdavide (u_int)(to_sbt & 0xffffffff), cpu); 1004220456Sattilio CC_UNLOCK(cc); 1005220456Sattilio return (cancelled); 1006220456Sattilio } 1007220456Sattilio cc = callout_cpu_switch(c, cc, cpu); 1008177859Sjeff } 1009220456Sattilio#endif 1010177859Sjeff 1011247777Sdavide callout_cc_add(c, cc, to_sbt, precision, ftn, arg, cpu, flags); 1012247777Sdavide CTR6(KTR_CALLOUT, "%sscheduled %p func %p arg %p in %d.%08x", 1013247777Sdavide cancelled ? "re" : "", c, c->c_func, c->c_arg, (int)(to_sbt >> 32), 1014247777Sdavide (u_int)(to_sbt & 0xffffffff)); 1015177859Sjeff CC_UNLOCK(cc); 1016149879Sglebius 1017149879Sglebius return (cancelled); 101844510Swollman} 101944510Swollman 1020181191Ssam/* 1021181191Ssam * Common idioms that can be optimized in the future. 1022181191Ssam */ 102381481Sjhbint 1024181191Ssamcallout_schedule_on(struct callout *c, int to_ticks, int cpu) 1025181191Ssam{ 1026181191Ssam return callout_reset_on(c, to_ticks, c->c_func, c->c_arg, cpu); 1027181191Ssam} 1028181191Ssam 1029181191Ssamint 1030181191Ssamcallout_schedule(struct callout *c, int to_ticks) 1031181191Ssam{ 1032181191Ssam return callout_reset_on(c, to_ticks, c->c_func, c->c_arg, c->c_cpu); 1033181191Ssam} 1034181191Ssam 1035181191Ssamint 1036127969Scperciva_callout_stop_safe(c, safe) 1037127969Scperciva struct callout *c; 1038127969Scperciva int safe; 1039127969Scperciva{ 1040220456Sattilio struct callout_cpu *cc, *old_cc; 1041173760Sattilio struct lock_class *class; 1042247777Sdavide int direct, sq_locked, use_lock; 1043127969Scperciva 1044173760Sattilio /* 1045173760Sattilio * Some old subsystems don't hold Giant while running a callout_stop(), 1046173760Sattilio * so just discard this check for the moment. 1047173760Sattilio */ 1048173760Sattilio if (!safe && c->c_lock != NULL) { 1049173760Sattilio if (c->c_lock == &Giant.lock_object) 1050173760Sattilio use_lock = mtx_owned(&Giant); 1051173760Sattilio else { 1052173760Sattilio use_lock = 1; 1053173760Sattilio class = LOCK_CLASS(c->c_lock); 1054173760Sattilio class->lc_assert(c->c_lock, LA_XLOCKED); 1055173760Sattilio } 1056173760Sattilio } else 1057173760Sattilio use_lock = 0; 1058247777Sdavide direct = (c->c_flags & CALLOUT_DIRECT) != 0; 1059172025Sjhb sq_locked = 0; 1060220456Sattilio old_cc = NULL; 1061172025Sjhbagain: 1062177859Sjeff cc = callout_lock(c); 1063220456Sattilio 106444510Swollman /* 1065220456Sattilio * If the callout was migrating while the callout cpu lock was 1066220456Sattilio * dropped, just drop the sleepqueue lock and check the states 1067220456Sattilio * again. 1068220456Sattilio */ 1069220456Sattilio if (sq_locked != 0 && cc != old_cc) { 1070220456Sattilio#ifdef SMP 1071220456Sattilio CC_UNLOCK(cc); 1072247777Sdavide sleepq_release(&old_cc->cc_exec_entity[direct].cc_waiting); 1073220456Sattilio sq_locked = 0; 1074220456Sattilio old_cc = NULL; 1075220456Sattilio goto again; 1076220456Sattilio#else 1077220456Sattilio panic("migration should not happen"); 1078220456Sattilio#endif 1079220456Sattilio } 1080220456Sattilio 1081220456Sattilio /* 1082155957Sjhb * If the callout isn't pending, it's not on the queue, so 1083155957Sjhb * don't attempt to remove it from the queue. We can try to 1084155957Sjhb * stop it by other means however. 108544510Swollman */ 108644510Swollman if (!(c->c_flags & CALLOUT_PENDING)) { 108750673Sjlemon c->c_flags &= ~CALLOUT_ACTIVE; 1088155957Sjhb 1089155957Sjhb /* 1090155957Sjhb * If it wasn't on the queue and it isn't the current 1091155957Sjhb * callout, then we can't stop it, so just bail. 1092155957Sjhb */ 1093247777Sdavide if (cc->cc_exec_entity[direct].cc_curr != c) { 1094163246Sglebius CTR3(KTR_CALLOUT, "failed to stop %p func %p arg %p", 1095163246Sglebius c, c->c_func, c->c_arg); 1096177859Sjeff CC_UNLOCK(cc); 1097172025Sjhb if (sq_locked) 1098247777Sdavide sleepq_release( 1099247777Sdavide &cc->cc_exec_entity[direct].cc_waiting); 1100141428Siedowse return (0); 1101141428Siedowse } 1102155957Sjhb 1103141428Siedowse if (safe) { 1104127969Scperciva /* 1105155957Sjhb * The current callout is running (or just 1106155957Sjhb * about to run) and blocking is allowed, so 1107155957Sjhb * just wait for the current invocation to 1108155957Sjhb * finish. 1109127969Scperciva */ 1110247777Sdavide while (cc->cc_exec_entity[direct].cc_curr == c) { 1111171053Sattilio /* 1112171053Sattilio * Use direct calls to sleepqueue interface 1113171053Sattilio * instead of cv/msleep in order to avoid 1114177859Sjeff * a LOR between cc_lock and sleepqueue 1115171053Sattilio * chain spinlocks. This piece of code 1116171053Sattilio * emulates a msleep_spin() call actually. 1117172025Sjhb * 1118172025Sjhb * If we already have the sleepqueue chain 1119172025Sjhb * locked, then we can safely block. If we 1120172025Sjhb * don't already have it locked, however, 1121177859Sjeff * we have to drop the cc_lock to lock 1122172025Sjhb * it. This opens several races, so we 1123172025Sjhb * restart at the beginning once we have 1124172025Sjhb * both locks. If nothing has changed, then 1125172025Sjhb * we will end up back here with sq_locked 1126172025Sjhb * set. 1127171053Sattilio */ 1128172025Sjhb if (!sq_locked) { 1129177859Sjeff CC_UNLOCK(cc); 1130247777Sdavide sleepq_lock( 1131247777Sdavide &cc->cc_exec_entity[direct].cc_waiting); 1132172025Sjhb sq_locked = 1; 1133220456Sattilio old_cc = cc; 1134172025Sjhb goto again; 1135172025Sjhb } 1136220456Sattilio 1137220456Sattilio /* 1138220456Sattilio * Migration could be cancelled here, but 1139220456Sattilio * as long as it is still not sure when it 1140220456Sattilio * will be packed up, just let softclock() 1141220456Sattilio * take care of it. 1142220456Sattilio */ 1143247818Sdavide cc->cc_exec_entity[direct].cc_waiting = true; 1144171053Sattilio DROP_GIANT(); 1145177859Sjeff CC_UNLOCK(cc); 1146247777Sdavide sleepq_add( 1147247777Sdavide &cc->cc_exec_entity[direct].cc_waiting, 1148177859Sjeff &cc->cc_lock.lock_object, "codrain", 1149171053Sattilio SLEEPQ_SLEEP, 0); 1150247777Sdavide sleepq_wait( 1151247777Sdavide &cc->cc_exec_entity[direct].cc_waiting, 1152247777Sdavide 0); 1153172025Sjhb sq_locked = 0; 1154220456Sattilio old_cc = NULL; 1155171053Sattilio 1156171053Sattilio /* Reacquire locks previously released. */ 1157171053Sattilio PICKUP_GIANT(); 1158177859Sjeff CC_LOCK(cc); 1159155957Sjhb } 1160247777Sdavide } else if (use_lock && 1161247777Sdavide !cc->cc_exec_entity[direct].cc_cancel) { 1162155957Sjhb /* 1163173760Sattilio * The current callout is waiting for its 1164173760Sattilio * lock which we hold. Cancel the callout 1165155957Sjhb * and return. After our caller drops the 1166173760Sattilio * lock, the callout will be skipped in 1167155957Sjhb * softclock(). 1168155957Sjhb */ 1169247818Sdavide cc->cc_exec_entity[direct].cc_cancel = true; 1170163246Sglebius CTR3(KTR_CALLOUT, "cancelled %p func %p arg %p", 1171163246Sglebius c, c->c_func, c->c_arg); 1172247777Sdavide KASSERT(!cc_cce_migrating(cc, direct), 1173220456Sattilio ("callout wrongly scheduled for migration")); 1174177859Sjeff CC_UNLOCK(cc); 1175172025Sjhb KASSERT(!sq_locked, ("sleepqueue chain locked")); 1176141428Siedowse return (1); 1177234952Skib } else if ((c->c_flags & CALLOUT_DFRMIGRATION) != 0) { 1178234952Skib c->c_flags &= ~CALLOUT_DFRMIGRATION; 1179234952Skib CTR3(KTR_CALLOUT, "postponing stop %p func %p arg %p", 1180234952Skib c, c->c_func, c->c_arg); 1181234952Skib CC_UNLOCK(cc); 1182234952Skib return (1); 1183155957Sjhb } 1184163246Sglebius CTR3(KTR_CALLOUT, "failed to stop %p func %p arg %p", 1185163246Sglebius c, c->c_func, c->c_arg); 1186177859Sjeff CC_UNLOCK(cc); 1187172025Sjhb KASSERT(!sq_locked, ("sleepqueue chain still locked")); 118881481Sjhb return (0); 118944510Swollman } 1190172025Sjhb if (sq_locked) 1191247777Sdavide sleepq_release(&cc->cc_exec_entity[direct].cc_waiting); 1192172025Sjhb 119350673Sjlemon c->c_flags &= ~(CALLOUT_ACTIVE | CALLOUT_PENDING); 119444510Swollman 1195234981Skib CTR3(KTR_CALLOUT, "cancelled %p func %p arg %p", 1196234981Skib c, c->c_func, c->c_arg); 1197247777Sdavide if ((c->c_flags & CALLOUT_PROCESSED) == 0) { 1198247777Sdavide if (cc->cc_exec_next_dir == c) 1199247777Sdavide cc->cc_exec_next_dir = LIST_NEXT(c, c_links.le); 1200247777Sdavide LIST_REMOVE(c, c_links.le); 1201247777Sdavide } else 1202247777Sdavide TAILQ_REMOVE(&cc->cc_expireq, c, c_links.tqe); 1203234981Skib callout_cc_del(c, cc); 120444510Swollman 1205177859Sjeff CC_UNLOCK(cc); 120681481Sjhb return (1); 120744510Swollman} 120844510Swollman 120944510Swollmanvoid 121069147Sjlemoncallout_init(c, mpsafe) 121144510Swollman struct callout *c; 121269147Sjlemon int mpsafe; 121344510Swollman{ 121444527Swollman bzero(c, sizeof *c); 1215141428Siedowse if (mpsafe) { 1216173760Sattilio c->c_lock = NULL; 1217141428Siedowse c->c_flags = CALLOUT_RETURNUNLOCKED; 1218141428Siedowse } else { 1219173760Sattilio c->c_lock = &Giant.lock_object; 1220141428Siedowse c->c_flags = 0; 1221141428Siedowse } 1222177859Sjeff c->c_cpu = timeout_cpu; 122344510Swollman} 122444510Swollman 1225141428Siedowsevoid 1226173760Sattilio_callout_init_lock(c, lock, flags) 1227141428Siedowse struct callout *c; 1228173760Sattilio struct lock_object *lock; 1229141428Siedowse int flags; 1230141428Siedowse{ 1231141428Siedowse bzero(c, sizeof *c); 1232173760Sattilio c->c_lock = lock; 1233173760Sattilio KASSERT((flags & ~(CALLOUT_RETURNUNLOCKED | CALLOUT_SHAREDLOCK)) == 0, 1234173760Sattilio ("callout_init_lock: bad flags %d", flags)); 1235173760Sattilio KASSERT(lock != NULL || (flags & CALLOUT_RETURNUNLOCKED) == 0, 1236173760Sattilio ("callout_init_lock: CALLOUT_RETURNUNLOCKED with no lock")); 1237176013Sattilio KASSERT(lock == NULL || !(LOCK_CLASS(lock)->lc_flags & 1238176013Sattilio (LC_SPINLOCK | LC_SLEEPABLE)), ("%s: invalid lock class", 1239173760Sattilio __func__)); 1240173760Sattilio c->c_flags = flags & (CALLOUT_RETURNUNLOCKED | CALLOUT_SHAREDLOCK); 1241177859Sjeff c->c_cpu = timeout_cpu; 1242141428Siedowse} 1243141428Siedowse 124431950Snate#ifdef APM_FIXUP_CALLTODO 124531950Snate/* 124631950Snate * Adjust the kernel calltodo timeout list. This routine is used after 124731950Snate * an APM resume to recalculate the calltodo timer list values with the 124831950Snate * number of hz's we have been sleeping. The next hardclock() will detect 124931950Snate * that there are fired timers and run softclock() to execute them. 125031950Snate * 125131950Snate * Please note, I have not done an exhaustive analysis of what code this 125231950Snate * might break. I am motivated to have my select()'s and alarm()'s that 125331950Snate * have expired during suspend firing upon resume so that the applications 125431950Snate * which set the timer can do the maintanence the timer was for as close 125531950Snate * as possible to the originally intended time. Testing this code for a 125631950Snate * week showed that resuming from a suspend resulted in 22 to 25 timers 125731950Snate * firing, which seemed independant on whether the suspend was 2 hours or 125831950Snate * 2 days. Your milage may vary. - Ken Key <key@cs.utk.edu> 125931950Snate */ 126031950Snatevoid 126131950Snateadjust_timeout_calltodo(time_change) 126231950Snate struct timeval *time_change; 126331950Snate{ 126431950Snate register struct callout *p; 126531950Snate unsigned long delta_ticks; 126631950Snate 126731950Snate /* 126831950Snate * How many ticks were we asleep? 126936127Sbde * (stolen from tvtohz()). 127031950Snate */ 127131950Snate 127231950Snate /* Don't do anything */ 127331950Snate if (time_change->tv_sec < 0) 127431950Snate return; 127531950Snate else if (time_change->tv_sec <= LONG_MAX / 1000000) 127631950Snate delta_ticks = (time_change->tv_sec * 1000000 + 127731950Snate time_change->tv_usec + (tick - 1)) / tick + 1; 127831950Snate else if (time_change->tv_sec <= LONG_MAX / hz) 127931950Snate delta_ticks = time_change->tv_sec * hz + 128031950Snate (time_change->tv_usec + (tick - 1)) / tick + 1; 128131950Snate else 128231950Snate delta_ticks = LONG_MAX; 128331950Snate 128431950Snate if (delta_ticks > INT_MAX) 128531950Snate delta_ticks = INT_MAX; 128631950Snate 128731950Snate /* 128831950Snate * Now rip through the timer calltodo list looking for timers 128931950Snate * to expire. 129031950Snate */ 129131950Snate 129231950Snate /* don't collide with softclock() */ 1293177859Sjeff CC_LOCK(cc); 129431950Snate for (p = calltodo.c_next; p != NULL; p = p->c_next) { 129531950Snate p->c_time -= delta_ticks; 129631950Snate 129731950Snate /* Break if the timer had more time on it than delta_ticks */ 129831950Snate if (p->c_time > 0) 129931950Snate break; 130031950Snate 130131950Snate /* take back the ticks the timer didn't use (p->c_time <= 0) */ 130231950Snate delta_ticks = -p->c_time; 130331950Snate } 1304177859Sjeff CC_UNLOCK(cc); 130531950Snate 130631950Snate return; 130731950Snate} 130831950Snate#endif /* APM_FIXUP_CALLTODO */ 1309247777Sdavide 1310247777Sdavidestatic int 1311247777Sdavideflssbt(sbintime_t sbt) 1312247777Sdavide{ 1313247777Sdavide 1314247777Sdavide sbt += (uint64_t)sbt >> 1; 1315247777Sdavide if (sizeof(long) >= sizeof(sbintime_t)) 1316247777Sdavide return (flsl(sbt)); 1317247777Sdavide if (sbt >= SBT_1S) 1318247777Sdavide return (flsl(((uint64_t)sbt) >> 32) + 32); 1319247777Sdavide return (flsl(sbt)); 1320247777Sdavide} 1321247777Sdavide 1322247777Sdavide/* 1323247777Sdavide * Dump immediate statistic snapshot of the scheduled callouts. 1324247777Sdavide */ 1325247777Sdavidestatic int 1326247777Sdavidesysctl_kern_callout_stat(SYSCTL_HANDLER_ARGS) 1327247777Sdavide{ 1328247777Sdavide struct callout *tmp; 1329247777Sdavide struct callout_cpu *cc; 1330247777Sdavide struct callout_list *sc; 1331247777Sdavide sbintime_t maxpr, maxt, medpr, medt, now, spr, st, t; 1332247777Sdavide int ct[64], cpr[64], ccpbk[32]; 1333247777Sdavide int error, val, i, count, tcum, pcum, maxc, c, medc; 1334247777Sdavide#ifdef SMP 1335247777Sdavide int cpu; 1336247777Sdavide#endif 1337247777Sdavide 1338247777Sdavide val = 0; 1339247777Sdavide error = sysctl_handle_int(oidp, &val, 0, req); 1340247777Sdavide if (error != 0 || req->newptr == NULL) 1341247777Sdavide return (error); 1342247777Sdavide count = maxc = 0; 1343247777Sdavide st = spr = maxt = maxpr = 0; 1344247777Sdavide bzero(ccpbk, sizeof(ccpbk)); 1345247777Sdavide bzero(ct, sizeof(ct)); 1346247777Sdavide bzero(cpr, sizeof(cpr)); 1347247777Sdavide now = sbinuptime(); 1348247777Sdavide#ifdef SMP 1349247777Sdavide CPU_FOREACH(cpu) { 1350247777Sdavide cc = CC_CPU(cpu); 1351247777Sdavide#else 1352247777Sdavide cc = CC_CPU(timeout_cpu); 1353247777Sdavide#endif 1354247777Sdavide CC_LOCK(cc); 1355247777Sdavide for (i = 0; i < callwheelsize; i++) { 1356247777Sdavide sc = &cc->cc_callwheel[i]; 1357247777Sdavide c = 0; 1358247777Sdavide LIST_FOREACH(tmp, sc, c_links.le) { 1359247777Sdavide c++; 1360247777Sdavide t = tmp->c_time - now; 1361247777Sdavide if (t < 0) 1362247777Sdavide t = 0; 1363247777Sdavide st += t / SBT_1US; 1364247777Sdavide spr += tmp->c_precision / SBT_1US; 1365247777Sdavide if (t > maxt) 1366247777Sdavide maxt = t; 1367247777Sdavide if (tmp->c_precision > maxpr) 1368247777Sdavide maxpr = tmp->c_precision; 1369247777Sdavide ct[flssbt(t)]++; 1370247777Sdavide cpr[flssbt(tmp->c_precision)]++; 1371247777Sdavide } 1372247777Sdavide if (c > maxc) 1373247777Sdavide maxc = c; 1374247777Sdavide ccpbk[fls(c + c / 2)]++; 1375247777Sdavide count += c; 1376247777Sdavide } 1377247777Sdavide CC_UNLOCK(cc); 1378247777Sdavide#ifdef SMP 1379247777Sdavide } 1380247777Sdavide#endif 1381247777Sdavide 1382247777Sdavide for (i = 0, tcum = 0; i < 64 && tcum < count / 2; i++) 1383247777Sdavide tcum += ct[i]; 1384247777Sdavide medt = (i >= 2) ? (((sbintime_t)1) << (i - 2)) : 0; 1385247777Sdavide for (i = 0, pcum = 0; i < 64 && pcum < count / 2; i++) 1386247777Sdavide pcum += cpr[i]; 1387247777Sdavide medpr = (i >= 2) ? (((sbintime_t)1) << (i - 2)) : 0; 1388247777Sdavide for (i = 0, c = 0; i < 32 && c < count / 2; i++) 1389247777Sdavide c += ccpbk[i]; 1390247777Sdavide medc = (i >= 2) ? (1 << (i - 2)) : 0; 1391247777Sdavide 1392247777Sdavide printf("Scheduled callouts statistic snapshot:\n"); 1393247777Sdavide printf(" Callouts: %6d Buckets: %6d*%-3d Bucket size: 0.%06ds\n", 1394247777Sdavide count, callwheelsize, mp_ncpus, 1000000 >> CC_HASH_SHIFT); 1395247777Sdavide printf(" C/Bk: med %5d avg %6d.%06jd max %6d\n", 1396247777Sdavide medc, 1397247777Sdavide count / callwheelsize / mp_ncpus, 1398247777Sdavide (uint64_t)count * 1000000 / callwheelsize / mp_ncpus % 1000000, 1399247777Sdavide maxc); 1400247777Sdavide printf(" Time: med %5jd.%06jds avg %6jd.%06jds max %6jd.%06jds\n", 1401247777Sdavide medt / SBT_1S, (medt & 0xffffffff) * 1000000 >> 32, 1402247777Sdavide (st / count) / 1000000, (st / count) % 1000000, 1403247777Sdavide maxt / SBT_1S, (maxt & 0xffffffff) * 1000000 >> 32); 1404247777Sdavide printf(" Prec: med %5jd.%06jds avg %6jd.%06jds max %6jd.%06jds\n", 1405247777Sdavide medpr / SBT_1S, (medpr & 0xffffffff) * 1000000 >> 32, 1406247777Sdavide (spr / count) / 1000000, (spr / count) % 1000000, 1407247777Sdavide maxpr / SBT_1S, (maxpr & 0xffffffff) * 1000000 >> 32); 1408247777Sdavide printf(" Distribution: \tbuckets\t time\t tcum\t" 1409247777Sdavide " prec\t pcum\n"); 1410247777Sdavide for (i = 0, tcum = pcum = 0; i < 64; i++) { 1411247777Sdavide if (ct[i] == 0 && cpr[i] == 0) 1412247777Sdavide continue; 1413247777Sdavide t = (i != 0) ? (((sbintime_t)1) << (i - 1)) : 0; 1414247777Sdavide tcum += ct[i]; 1415247777Sdavide pcum += cpr[i]; 1416247777Sdavide printf(" %10jd.%06jds\t 2**%d\t%7d\t%7d\t%7d\t%7d\n", 1417247777Sdavide t / SBT_1S, (t & 0xffffffff) * 1000000 >> 32, 1418247777Sdavide i - 1 - (32 - CC_HASH_SHIFT), 1419247777Sdavide ct[i], tcum, cpr[i], pcum); 1420247777Sdavide } 1421247777Sdavide return (error); 1422247777Sdavide} 1423247777SdavideSYSCTL_PROC(_kern, OID_AUTO, callout_stat, 1424247777Sdavide CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 1425247777Sdavide 0, 0, sysctl_kern_callout_stat, "I", 1426247777Sdavide "Dump immediate statistic snapshot of the scheduled callouts"); 1427