1 #!/usr/sbin/dtrace -qs
2
3 /*-
4 * Copyright (c) 2008-2012 Alexander Leidinger <netchild@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer
12 * in this position and unchanged.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD: releng/11.0/sys/compat/linux/stats_timing.d 283383 2015-05-24 14:53:16Z dchagin $
29 */
30
31 /**
32 * Some statistics (all per provider):
33 * - number of calls to a function per executable binary (not per PID!)
34 * - allows to see where an optimization would be beneficial for a given
35 * application
36 * - graph of CPU time spend in functions per executable binary
37 * - together with the number of calls to this function this allows
38 * to determine if a kernel optimization would be beneficial / is
39 * possible for a given application
40 * - graph of longest running (CPU-time!) function in total
41 * - may help finding problem cases in the kernel code
42 * - graph of longest held (CPU-time!) locks
43 */
44
45 #pragma D option dynvarsize=32m
46
47 linuxulator*:::entry
48 {
49 self->time[probefunc] = vtimestamp;
50 @calls[probeprov, execname, probefunc] = count();
51 }
52
53 linuxulator*:::return
54 /self->time[probefunc] != 0/
55 {
56 this->timediff = self->time[probefunc] - vtimestamp;
57
58 @stats[probeprov, execname, probefunc] = quantize(this->timediff);
59 @longest[probeprov, probefunc] = max(this->timediff);
60
61 self->time[probefunc] = 0;
62 }
63
64 linuxulator*:::locked
65 {
66 self->lock[arg0] = vtimestamp;
67 }
68
69 linuxulator*:::unlock
70 /self->lock[arg0] != 0/
71 {
72 this->timediff = self->lock[arg0] - vtimestamp;
73
74 @lockstats[probefunc] = quantize(this->timediff);
75 @longlock[probefunc] = max(this->timediff);
76
77 self->lock[arg0] = 0;
78 }
79
80 END
81 {
82 printf("Number of calls per provider/application/kernel function:");
83 printa(@calls);
84 printf("CPU-timing statistics per provider/application/kernel function (in ns):");
85 printa(@stats);
86 printf("Longest running (CPU-time!) functions per provider (in ns):");
87 printa(@longest);
88 printf("Lock CPU-timing statistics:");
89 printa(@lockstats);
90 printf("Longest running (CPU-time!) locks:");
91 printa(@longlock);
92 }
93
Cache object: 4c4e9fc7a6a4505641f5a076a08aa55f
|