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Annotation of XNU/osfmk/kern/mach_clock.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * @OSF_COPYRIGHT@
        !            24:  */
        !            25: /* 
        !            26:  * Mach Operating System
        !            27:  * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
        !            28:  * All Rights Reserved.
        !            29:  * 
        !            30:  * Permission to use, copy, modify and distribute this software and its
        !            31:  * documentation is hereby granted, provided that both the copyright
        !            32:  * notice and this permission notice appear in all copies of the
        !            33:  * software, derivative works or modified versions, and any portions
        !            34:  * thereof, and that both notices appear in supporting documentation.
        !            35:  * 
        !            36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            39:  * 
        !            40:  * Carnegie Mellon requests users of this software to return to
        !            41:  * 
        !            42:  *  Software Distribution Coordinator  or  [email protected]
        !            43:  *  School of Computer Science
        !            44:  *  Carnegie Mellon University
        !            45:  *  Pittsburgh PA 15213-3890
        !            46:  * 
        !            47:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            48:  * the rights to redistribute these changes.
        !            49:  */
        !            50: /*
        !            51:  */
        !            52: /*
        !            53:  *     File:   clock_prim.c
        !            54:  *     Author: Avadis Tevanian, Jr.
        !            55:  *     Date:   1986
        !            56:  *
        !            57:  *     Clock primitives.
        !            58:  */
        !            59: #include <cpus.h>
        !            60: #include <stat_time.h>
        !            61: #include <mach_prof.h>
        !            62: #include <gprof.h>
        !            63: 
        !            64: #include <mach/boolean.h>
        !            65: #include <mach/machine.h>
        !            66: #include <mach/time_value.h>
        !            67: #include <mach/vm_param.h>
        !            68: #include <mach/vm_prot.h>
        !            69: #include <kern/clock.h>
        !            70: #include <kern/counters.h>
        !            71: #include <kern/cpu_number.h>
        !            72: #include <kern/host.h>
        !            73: #include <kern/lock.h>
        !            74: #include <kern/mach_param.h>
        !            75: #include <kern/misc_protos.h>
        !            76: #include <kern/processor.h>
        !            77: #include <kern/profile.h>
        !            78: #include <kern/sched.h>
        !            79: #include <kern/sched_prim.h>
        !            80: #include <kern/spl.h>
        !            81: #include <kern/thread.h>
        !            82: #include <kern/thread_swap.h>
        !            83: #include <kern/time_out.h>
        !            84: #include <vm/vm_kern.h>                                        /* kernel_map */
        !            85: #include <machine/mach_param.h>                        /* HZ */
        !            86: 
        !            87: #include <mach/clock_server.h>
        !            88: #include <mach/clock_priv_server.h>
        !            89: #include <mach/mach_host_server.h>
        !            90: 
        !            91: #include <profiling/profile-mk.h>
        !            92: 
        !            93: #if    STAT_TIME
        !            94: #define        TICKBUMP(t)     timer_bump(t, (1000000/HZ))
        !            95: #else
        !            96: #define        TICKBUMP(t)
        !            97: #endif
        !            98: 
        !            99: boolean_t      profile_kernel_services = TRUE; /* Indicates wether or not we
        !           100:                                                                                         * account kernel services 
        !           101:                                                                                         * samples for user task */
        !           102: 
        !           103: /*
        !           104:  * Hertz rate clock interrupt servicing. Primarily used to
        !           105:  * update CPU statistics, recompute thread priority, and to
        !           106:  * do profiling
        !           107:  */
        !           108: void
        !           109: hertz_tick(
        !           110:        boolean_t                       usermode,       /* executing user code */
        !           111:        natural_t                       pc)
        !           112: {
        !           113:        thread_act_t            thr_act;
        !           114:        register int            my_cpu;
        !           115:        register thread_t       thread = current_thread();
        !           116:        int                                     state;
        !           117: #if            MACH_PROF
        !           118: #ifdef __MACHO__
        !           119: #define        ETEXT                   etext
        !           120:        extern long                     etext;
        !           121: #else
        !           122: #define        ETEXT                   &etext
        !           123:        extern char                     etext;
        !           124: #endif
        !           125:        boolean_t                       inkernel;
        !           126: #endif /* MACH_PROF */
        !           127: #if GPROF
        !           128:        struct profile_vars     *pv;
        !           129:        prof_uptrint_t          s;
        !           130: #endif
        !           131: 
        !           132: #ifdef lint
        !           133:        pc++;
        !           134: #endif /* lint */
        !           135: 
        !           136:        mp_disable_preemption();
        !           137:        my_cpu = cpu_number();
        !           138: 
        !           139:        /*
        !           140:         *      The system startup sequence initializes the clock
        !           141:         *      before kicking off threads.   So it's possible,
        !           142:         *      especially when debugging, to wind up here with
        !           143:         *      no thread to bill against.  So ignore the tick.
        !           144:         */
        !           145:        if (thread == THREAD_NULL) {
        !           146:                mp_enable_preemption();
        !           147:                return;
        !           148:        }
        !           149: 
        !           150: #if            MACH_PROF
        !           151:        inkernel = !usermode && (pc < (unsigned int)ETEXT);
        !           152: #endif /* MACH_PROF */
        !           153: 
        !           154:        /*
        !           155:         * Hertz processing performed by all processors
        !           156:         * includes statistics gathering, state tracking,
        !           157:         * and quantum updating.
        !           158:         */
        !           159:        counter(c_clock_ticks++);
        !           160: 
        !           161: #if     GPROF
        !           162:        pv = PROFILE_VARS(my_cpu);
        !           163: #endif
        !           164: 
        !           165:        if (usermode) {
        !           166:                TICKBUMP(&thread->user_timer);
        !           167: #if 0
        !           168:                if (thread->priority < BASEPRI_USER)
        !           169:                        state = CPU_STATE_NICE;
        !           170:                else
        !           171: #endif
        !           172:                        state = CPU_STATE_USER;
        !           173: #if GPROF
        !           174:                        if (pv->active)
        !           175:                            PROF_CNT_INC(pv->stats.user_ticks);
        !           176: #endif
        !           177:        }
        !           178:        else {
        !           179:                switch(processor_ptr[my_cpu]->state) {
        !           180: 
        !           181:                case PROCESSOR_IDLE:
        !           182:                        TICKBUMP(&thread->system_timer);
        !           183:                        state = CPU_STATE_IDLE;
        !           184:                        break;
        !           185: 
        !           186:                default:
        !           187:                        TICKBUMP(&thread->system_timer);
        !           188:                        state = CPU_STATE_SYSTEM;
        !           189:                        break;
        !           190:                }
        !           191: #if GPROF
        !           192:                if (pv->active) {
        !           193:                        if (state == CPU_STATE_SYSTEM)
        !           194:                                PROF_CNT_INC(pv->stats.kernel_ticks);
        !           195:                        else
        !           196:                                PROF_CNT_INC(pv->stats.idle_ticks);
        !           197: 
        !           198:                        if ((prof_uptrint_t)pc < _profile_vars.profil_info.lowpc)
        !           199:                                PROF_CNT_INC(pv->stats.too_low);
        !           200:                        else {
        !           201:                                s = (prof_uptrint_t)pc - _profile_vars.profil_info.lowpc;
        !           202:                                if (s < pv->profil_info.text_len) {
        !           203:                                        LHISTCOUNTER *ptr = (LHISTCOUNTER *) pv->profil_buf;
        !           204:                                        LPROF_CNT_INC(ptr[s / HISTFRACTION]);
        !           205:                                }
        !           206:                                else
        !           207:                                        PROF_CNT_INC(pv->stats.too_high);
        !           208:                        }
        !           209:                }
        !           210: #endif
        !           211:        }
        !           212: 
        !           213:        machine_slot[my_cpu].cpu_ticks[state]++;
        !           214:        thread_quantum_update(my_cpu, thread, 1, state);
        !           215: 
        !           216:        /*
        !           217:         * Hertz processing performed by the master-cpu
        !           218:         * exclusively.
        !           219:         */
        !           220:        if (my_cpu == master_cpu) {
        !           221: #ifdef MACH_BSD
        !           222:                {
        !           223:                        extern void     bsd_hardclock(
        !           224:                                                                boolean_t       usermode,
        !           225:                                                                natural_t       pc,
        !           226:                                                                int                     ticks);
        !           227: 
        !           228:                        bsd_hardclock(usermode, pc, 1);
        !           229:                }
        !           230: #endif /* MACH_BSD */
        !           231:        }
        !           232: 
        !           233: #if    MACH_PROF
        !           234:        thr_act = thread->top_act;
        !           235:        if (thr_act->act_profiled && thread->sched_pri != DEPRESSPRI) {
        !           236:                if (inkernel && thr_act->map != kernel_map) {
        !           237:                        /* 
        !           238:                         * Non-kernel thread running in kernel
        !           239:                         * Register user pc (mach_msg, vm_allocate ...)
        !           240:                         */
        !           241:                        if (profile_kernel_services)
        !           242:                                profile(user_pc(thr_act), thr_act->profil_buffer);
        !           243:                }
        !           244:                else
        !           245:                        /*
        !           246:                         * User thread and user mode or
        !           247:                         * user (server) thread in kernel-loaded server or
        !           248:                         * kernel thread and kernel mode
        !           249:                         * register interrupted pc
        !           250:                         */
        !           251:                        profile(pc, thr_act->profil_buffer);
        !           252:        }
        !           253:        if (kernel_task->task_profiled && thread->sched_pri != DEPRESSPRI) {
        !           254:                if (inkernel && thr_act->map != kernel_map)
        !           255:                        /*
        !           256:                         * User thread not profiled in kernel mode,
        !           257:                         * kernel task profiled, register kernel pc
        !           258:                         * for kernel task
        !           259:                         */
        !           260:                        profile(pc, kernel_task->profil_buffer);
        !           261:        }
        !           262: #endif /* MACH_PROF */
        !           263:        mp_enable_preemption();
        !           264: }
        !           265: 
        !           266: 
        !           267: /*
        !           268:  * Kernel timeout services.
        !           269:  */
        !           270: 
        !           271: /*
        !           272:  *     Set a timeout.
        !           273:  *
        !           274:  *     fcn:            function to call
        !           275:  *     param:          parameter to pass to function
        !           276:  *     interval:       timeout interval, in hz.
        !           277:  */
        !           278: void
        !           279: timeout(
        !           280:        timeout_fcn_t                   fcn,
        !           281:        void                                    *param,
        !           282:        int                                             interval)
        !           283: {
        !           284:        AbsoluteTime                    deadline;
        !           285: 
        !           286:        clock_interval_to_deadline(interval, NSEC_PER_SEC / hz, &deadline);
        !           287:        thread_call_func_delayed((thread_call_func_t)fcn, param, deadline);
        !           288: }
        !           289: 
        !           290: /*
        !           291:  * Cancel a timeout.
        !           292:  */
        !           293: void
        !           294: untimeout(
        !           295:        register timeout_fcn_t          fcn,
        !           296:        register void                           *param)
        !           297: {
        !           298:        thread_call_func_cancel((thread_call_func_t)fcn, param, FALSE);
        !           299: }

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