osfmk/kern/mach_clock.c

   1 /*
   2  * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56 /*
  57  */
  58 /*
  59  *      File:   clock_prim.c
  60  *      Author: Avadis Tevanian, Jr.
  61  *      Date:   1986
  62  *
  63  *      Clock primitives.
  64  */
  65 #include <gprof.h>
  66
  67 #include <mach/boolean.h>
  68 #include <mach/machine.h>
  69 #include <mach/time_value.h>
  70 #include <mach/vm_param.h>
  71 #include <mach/vm_prot.h>
  72 #include <kern/clock.h>
  73 #include <kern/cpu_number.h>
  74 #include <kern/host.h>
  75 #include <kern/lock.h>
  76 #include <kern/mach_param.h>
  77 #include <kern/misc_protos.h>
  78 #include <kern/processor.h>
  79 #include <kern/sched.h>
  80 #include <kern/sched_prim.h>
  81 #include <kern/thread.h>
  82
  83 #include <profiling/profile-mk.h>
  84
  85 #if GPROF
  86 static void prof_tick(boolean_t usermode, natural_t pc);
  87 #endif
  88
  89 #if STAT_TIME || GPROF
  90 /*
  91  * Hertz rate clock interrupt servicing. Used to update processor
  92  * statistics and perform kernel profiling.
  93  */
  94 void
  95 hertz_tick(
  96 #if GPROF
  97         __unused natural_t      ticks,
  98 #else
  99         natural_t               ticks,
 100 #endif
 101         boolean_t               usermode,
 102 #if GPROF
 103         natural_t               pc)
 104 #else
 105         __unused natural_t              pc)
 106 #endif
 107 {
 108         processor_t             processor = current_processor();
 109         thread_t                thread = current_thread();
 110         timer_t                 state;
 111
 112         if (usermode) {
 113                 TIMER_BUMP(&thread->user_timer, ticks);
 114
 115                 state = &PROCESSOR_DATA(processor, user_state);
 116         }
 117         else {
 118                 /* If this thread is idling, do not charge that time as system time */
 119                 if ((thread->state & TH_IDLE) == 0) {
 120                         TIMER_BUMP(&thread->system_timer, ticks);
 121                 }
 122
 123                 if (processor->state == PROCESSOR_IDLE)
 124                         state = &PROCESSOR_DATA(processor, idle_state);
 125                 else
 126                         state = &PROCESSOR_DATA(processor, system_state);
 127         }
 128
 129         TIMER_BUMP(state, ticks);
 130
 131 #if GPROF
 132         prof_tick(usermode, pc);
 133 #endif  /* GPROF */
 134 }
 135
 136 #endif  /* STAT_TIME */
 137
 138 #if GPROF
 139
 140 static void
 141 prof_tick(
 142         boolean_t       usermode,
 143         natural_t       pc)
 144 {
 145         struct profile_vars     *pv;
 146         prof_uptrint_t          s;
 147
 148         pv = PROFILE_VARS(cpu_number());
 149
 150         if (usermode) {
 151                 if (pv->active)
 152                         PROF_CNT_INC(pv->stats.user_ticks);
 153         }
 154         else {
 155                 if (pv->active) {
 156                         if (current_processor()->state == CPU_STATE_IDLE)
 157                                 PROF_CNT_INC(pv->stats.idle_ticks);
 158                         else
 159                                 PROF_CNT_INC(pv->stats.kernel_ticks);
 160
 161                         if ((prof_uptrint_t)pc < _profile_vars.profil_info.lowpc)
 162                                 PROF_CNT_INC(pv->stats.too_low);
 163                         else {
 164                                 s = (prof_uptrint_t)pc - _profile_vars.profil_info.lowpc;
 165                                 if (s < pv->profil_info.text_len) {
 166                                         LHISTCOUNTER *ptr = (LHISTCOUNTER *) pv->profil_buf;
 167                                         LPROF_CNT_INC(ptr[s / HISTFRACTION]);
 168                                 }
 169                                 else
 170                                         PROF_CNT_INC(pv->stats.too_high);
 171                         }
 172                 }
 173         }
 174 }
 175
 176 #endif  /* GPROF */