1 /* $NetBSD: dtrace_vtime.c,v 1.3 2018/05/28 21:05:03 chs Exp $ */
2
3 /*
4 * CDDL HEADER START
5 *
6 * The contents of this file are subject to the terms of the
7 * Common Development and Distribution License (the "License").
8 * You may not use this file except in compliance with the License.
9 *
10 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
11 * or http://www.opensolaris.org/os/licensing.
12 * See the License for the specific language governing permissions
13 * and limitations under the License.
14 *
15 * When distributing Covered Code, include this CDDL HEADER in each
16 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
17 * If applicable, add the following below this CDDL HEADER, with the
18 * fields enclosed by brackets "[]" replaced with your own identifying
19 * information: Portions Copyright [yyyy] [name of copyright owner]
20 *
21 * CDDL HEADER END
22 *
23 * $FreeBSD: head/sys/cddl/dev/dtrace/dtrace_vtime.c 179237 2008-05-23 05:59:42Z jb $
24 */
25
26 /*
27 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
28 * Use is subject to license terms.
29 */
30
31 void
dtrace_vtime_enable(void)32 dtrace_vtime_enable(void)
33 {
34 dtrace_vtime_state_t state, nstate = 0;
35
36 do {
37 state = dtrace_vtime_active;
38
39 switch (state) {
40 case DTRACE_VTIME_INACTIVE:
41 nstate = DTRACE_VTIME_ACTIVE;
42 break;
43
44 case DTRACE_VTIME_INACTIVE_TNF:
45 nstate = DTRACE_VTIME_ACTIVE_TNF;
46 break;
47
48 case DTRACE_VTIME_ACTIVE:
49 case DTRACE_VTIME_ACTIVE_TNF:
50 panic("DTrace virtual time already enabled");
51 /*NOTREACHED*/
52 }
53
54 } while (dtrace_cas32((uint32_t *)&dtrace_vtime_active,
55 state, nstate) != state);
56 }
57
58 void
dtrace_vtime_disable(void)59 dtrace_vtime_disable(void)
60 {
61 dtrace_vtime_state_t state, nstate = 0;
62
63 do {
64 state = dtrace_vtime_active;
65
66 switch (state) {
67 case DTRACE_VTIME_ACTIVE:
68 nstate = DTRACE_VTIME_INACTIVE;
69 break;
70
71 case DTRACE_VTIME_ACTIVE_TNF:
72 nstate = DTRACE_VTIME_INACTIVE_TNF;
73 break;
74
75 case DTRACE_VTIME_INACTIVE:
76 case DTRACE_VTIME_INACTIVE_TNF:
77 panic("DTrace virtual time already disabled");
78 /*NOTREACHED*/
79 }
80
81 } while (dtrace_cas32((uint32_t *)&dtrace_vtime_active,
82 state, nstate) != state);
83 }
84
85 void
dtrace_vtime_switch(kthread_t * next)86 dtrace_vtime_switch(kthread_t *next)
87 {
88 dtrace_icookie_t cookie;
89 hrtime_t ts;
90
91 cookie = dtrace_interrupt_disable();
92 ts = dtrace_gethrtime();
93
94 if (curthread->t_dtrace_start != 0) {
95 curthread->t_dtrace_vtime += ts - curthread->t_dtrace_start;
96 curthread->t_dtrace_start = 0;
97 }
98
99 if (next != NULL)
100 next->t_dtrace_start = ts;
101
102 dtrace_interrupt_enable(cookie);
103 }
104