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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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