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 27 syscall::read:entry 28 { 29 self->t = timestamp; 30 } 31 32 syscall::read:return 33 /self->t != 0/ 34 { 35 printf("%d/%d spent %d nsecs in read(2)\n", 36 pid, tid, timestamp - self->t); 37 38 /* 39 * We're done with this thread-local variable; assign zero to it to 40 * allow the DTrace runtime to reclaim the underlying storage. 41 */ 42 self->t = 0; 43 } 44