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      1 #!/usr/sbin/dtrace -s
      2 /*
      3  * rfileio.d - read file I/O stats, with cache miss rate.
      4  *             Written using DTrace (Solaris 10 3/05)
      5  *
      6  * This script provides statistics on the number of reads and the bytes
      7  * read from filesystems (logical), and the number of bytes read from
      8  * disk (physical). A summary is printed every five seconds by file.
      9  *
     10  * A total miss-rate is also provided for the file system cache.
     11  *
     12  * $Id: rfileio.d,v 1.1.1.1 2015/09/30 22:01:09 christos Exp $
     13  *
     14  * USAGE:	rfileio.d
     15  *
     16  * IDEA: Richard McDougall, Solaris Internals 2nd Ed, FS Chapter.
     17  *
     18  * COPYRIGHT: Copyright (c) 2006 Brendan Gregg.
     19  *
     20  * CDDL HEADER START
     21  *
     22  *  The contents of this file are subject to the terms of the
     23  *  Common Development and Distribution License, Version 1.0 only
     24  *  (the "License").  You may not use this file except in compliance
     25  *  with the License.
     26  *
     27  *  You can obtain a copy of the license at Docs/cddl1.txt
     28  *  or http://www.opensolaris.org/os/licensing.
     29  *  See the License for the specific language governing permissions
     30  *  and limitations under the License.
     31  *
     32  * CDDL HEADER END
     33  *
     34  * 19-Mar-2006  Brendan Gregg   Created this.
     35  * 23-Apr-2006	   "      "	Last update.
     36  */
     37 
     38 #pragma D option quiet
     39 
     40 self int trace;
     41 uint64_t lbytes;
     42 uint64_t pbytes;
     43 
     44 dtrace:::BEGIN
     45 {
     46 	trace("Tracing...\n");
     47 }
     48 
     49 fbt::fop_read:entry
     50 /self->trace == 0 && args[0]->v_path/
     51 {
     52 	self->pathname = cleanpath(args[0]->v_path);
     53 	@rio[self->pathname, "logical"] = count();
     54 	lbytes += args[1]->uio_resid;
     55 	self->size = args[1]->uio_resid;
     56 	self->uiop = args[1];
     57 }
     58 
     59 fbt::fop_read:return
     60 /self->size/
     61 {
     62 	@rbytes[self->pathname, "logical"] =
     63 	    sum(self->size - self->uiop->uio_resid);
     64 	self->size = 0;
     65 	self->uiop = 0;
     66 	self->pathname = 0;
     67 }
     68 
     69 io::bdev_strategy:start
     70 /self->size && args[0]->b_flags & B_READ/
     71 {
     72 	@rio[self->pathname, "physical"] = count();
     73 	@rbytes[self->pathname, "physical"] = sum(args[0]->b_bcount);
     74 	pbytes += args[0]->b_bcount;
     75 }
     76 
     77 profile:::tick-5s
     78 {
     79 	trunc(@rio, 20);
     80 	trunc(@rbytes, 20);
     81 	printf("\033[H\033[2J");
     82 	printf("\nRead IOPS, top 20 (count)\n");
     83 	printa("%-54s %10s %10@d\n", @rio);
     84 	printf("\nRead Bandwidth, top 20 (bytes)\n");
     85 	printa("%-54s %10s %10@d\n", @rbytes);
     86 	printf("\nTotal File System miss-rate: %d%%\n",
     87 	    lbytes ? 100 * pbytes / lbytes : 0);
     88 	trunc(@rbytes);
     89 	trunc(@rio);
     90 	lbytes = pbytes = 0;
     91 }
     92