diff options
Diffstat (limited to 'src/VBox/ExtPacks/VBoxDTrace/onnv/cmd/dtrace/demo/io/iothrough.d')
| -rw-r--r-- | src/VBox/ExtPacks/VBoxDTrace/onnv/cmd/dtrace/demo/io/iothrough.d | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/src/VBox/ExtPacks/VBoxDTrace/onnv/cmd/dtrace/demo/io/iothrough.d b/src/VBox/ExtPacks/VBoxDTrace/onnv/cmd/dtrace/demo/io/iothrough.d new file mode 100644 index 00000000..b5b2e7e3 --- /dev/null +++ b/src/VBox/ExtPacks/VBoxDTrace/onnv/cmd/dtrace/demo/io/iothrough.d @@ -0,0 +1,66 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License, Version 1.0 only + * (the "License"). You may not use this file except in compliance + * with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright 2005 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#pragma D option quiet + +io:::start +{ + start[args[0]->b_edev, args[0]->b_blkno] = timestamp; +} + +io:::done +/start[args[0]->b_edev, args[0]->b_blkno]/ +{ + /* + * We want to get an idea of our throughput to this device in KB/sec. + * What we have, however, is nanoseconds and bytes. That is we want + * to calculate: + * + * bytes / 1024 + * ------------------------ + * nanoseconds / 1000000000 + * + * But we can't calculate this using integer arithmetic without losing + * precision (the denomenator, for one, is between 0 and 1 for nearly + * all I/Os). So we restate the fraction, and cancel: + * + * bytes 1000000000 bytes 976562 + * --------- * ------------- = --------- * ------------- + * 1024 nanoseconds 1 nanoseconds + * + * This is easy to calculate using integer arithmetic; this is what + * we do below. + */ + this->elapsed = timestamp - start[args[0]->b_edev, args[0]->b_blkno]; + @[args[1]->dev_statname, args[1]->dev_pathname] = + quantize((args[0]->b_bcount * 976562) / this->elapsed); + start[args[0]->b_edev, args[0]->b_blkno] = 0; +} + +END +{ + printa(" %s (%s)\n%@d\n", @); +} |