1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 * 26 * This D script is used as an example in the Solaris Dynamic Tracing Guide 27 * wiki in the "sched Provider" Chapter. 28 * 29 * The full text of the this chapter may be found here: 30 * 31 * http://wikis.sun.com/display/DTrace/sched+Provider 32 * 33 * On machines that have DTrace installed, this script is available as 34 * whopreempt.d in /usr/demo/dtrace, a directory that contains all D scripts 35 * used in the Solaris Dynamic Tracing Guide. A table of the scripts and their 36 * corresponding chapters may be found here: 37 * 38 * file:///usr/demo/dtrace/index.html 39 */ 40 41 #pragma D option quiet 42 43 sched:::preempt 44 { 45 self->preempt = 1; 46 } 47 48 sched:::remain-cpu 49 /self->preempt/ 50 { 51 self->preempt = 0; 52 } 53 54 sched:::off-cpu 55 /self->preempt/ 56 { 57 /* 58 * If we were told to preempt ourselves, see who we ended up giving 59 * the CPU to. 60 */ 61 @[stringof(args[1]->pr_fname), args[0]->pr_pri, execname, 62 curlwpsinfo->pr_pri] = count(); 63 self->preempt = 0; 64 } 65 66 END 67 { 68 printf("%30s %3s %30s %3s %5s\n", "PREEMPTOR", "PRI", 69 "PREEMPTED", "PRI", "#"); 70 printa("%30s %3d %30s %3d %5@d\n", @); 71 } 72