1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #pragma D option quiet 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate io:::start 30*0Sstevel@tonic-gate { 31*0Sstevel@tonic-gate start[args[0]->b_edev, args[0]->b_blkno] = timestamp; 32*0Sstevel@tonic-gate } 33*0Sstevel@tonic-gate 34*0Sstevel@tonic-gate io:::done 35*0Sstevel@tonic-gate /start[args[0]->b_edev, args[0]->b_blkno]/ 36*0Sstevel@tonic-gate { 37*0Sstevel@tonic-gate /* 38*0Sstevel@tonic-gate * We want to get an idea of our throughput to this device in KB/sec. 39*0Sstevel@tonic-gate * What we have, however, is nanoseconds and bytes. That is we want 40*0Sstevel@tonic-gate * to calculate: 41*0Sstevel@tonic-gate * 42*0Sstevel@tonic-gate * bytes / 1024 43*0Sstevel@tonic-gate * ------------------------ 44*0Sstevel@tonic-gate * nanoseconds / 1000000000 45*0Sstevel@tonic-gate * 46*0Sstevel@tonic-gate * But we can't calculate this using integer arithmetic without losing 47*0Sstevel@tonic-gate * precision (the denomenator, for one, is between 0 and 1 for nearly 48*0Sstevel@tonic-gate * all I/Os). So we restate the fraction, and cancel: 49*0Sstevel@tonic-gate * 50*0Sstevel@tonic-gate * bytes 1000000000 bytes 976562 51*0Sstevel@tonic-gate * --------- * ------------- = --------- * ------------- 52*0Sstevel@tonic-gate * 1024 nanoseconds 1 nanoseconds 53*0Sstevel@tonic-gate * 54*0Sstevel@tonic-gate * This is easy to calculate using integer arithmetic; this is what 55*0Sstevel@tonic-gate * we do below. 56*0Sstevel@tonic-gate */ 57*0Sstevel@tonic-gate this->elapsed = timestamp - start[args[0]->b_edev, args[0]->b_blkno]; 58*0Sstevel@tonic-gate @[args[1]->dev_statname, args[1]->dev_pathname] = 59*0Sstevel@tonic-gate quantize((args[0]->b_bcount * 976562) / this->elapsed); 60*0Sstevel@tonic-gate start[args[0]->b_edev, args[0]->b_blkno] = 0; 61*0Sstevel@tonic-gate } 62*0Sstevel@tonic-gate 63*0Sstevel@tonic-gate END 64*0Sstevel@tonic-gate { 65*0Sstevel@tonic-gate printa(" %s (%s)\n%@d\n", @); 66*0Sstevel@tonic-gate } 67