FreeBSD/Linux Kernel Cross Reference
sys/sys/gmon.h
1 /* $NetBSD: gmon.h,v 1.7 2003/08/07 16:34:04 agc Exp $ */
2
3 /*-
4 * Copyright (c) 1982, 1986, 1992, 1993
5 * The Regents of the University of California. 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 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)gmon.h 8.2 (Berkeley) 1/4/94
32 */
33
34 #ifndef _SYS_GMON_H_
35 #define _SYS_GMON_H_
36
37 #include <machine/profile.h>
38
39 /*
40 * Structure prepended to gmon.out profiling data file.
41 */
42 struct gmonhdr {
43 u_long lpc; /* base pc address of sample buffer */
44 u_long hpc; /* max pc address of sampled buffer */
45 int ncnt; /* size of sample buffer (plus this header) */
46 int version; /* version number */
47 int profrate; /* profiling clock rate */
48 int spare[3]; /* reserved */
49 };
50 #define GMONVERSION 0x00051879
51
52 /*
53 * histogram counters are unsigned shorts (according to the kernel).
54 */
55 #define HISTCOUNTER unsigned short
56
57 /*
58 * fraction of text space to allocate for histogram counters here, 1/2
59 */
60 #ifndef HISTFRACTION
61 #define HISTFRACTION 2
62 #endif /* HISTFRACTION */
63
64 /*
65 * Fraction of text space to allocate for from hash buckets.
66 * The value of HASHFRACTION is based on the minimum number of bytes
67 * of separation between two subroutine call points in the object code.
68 * Given MIN_SUBR_SEPARATION bytes of separation the value of
69 * HASHFRACTION is calculated as:
70 *
71 * HASHFRACTION = MIN_SUBR_SEPARATION / (2 * sizeof(short) - 1);
72 *
73 * For example, on the VAX, the shortest two call sequence is:
74 *
75 * calls $0,(r0)
76 * calls $0,(r0)
77 *
78 * which is separated by only three bytes, thus HASHFRACTION is
79 * calculated as:
80 *
81 * HASHFRACTION = 3 / (2 * 2 - 1) = 1
82 *
83 * Note that the division above rounds down, thus if MIN_SUBR_FRACTION
84 * is less than three, this algorithm will not work!
85 *
86 * In practice, however, call instructions are rarely at a minimal
87 * distance. Hence, we will define HASHFRACTION to be 2 across all
88 * architectures. This saves a reasonable amount of space for
89 * profiling data structures without (in practice) sacrificing
90 * any granularity.
91 */
92 #define HASHFRACTION 2
93
94 /*
95 * percent of text space to allocate for tostructs with a minimum.
96 */
97 #define ARCDENSITY 2
98 #define MINARCS 50
99 #define MAXARCS ((1 << (8 * sizeof(HISTCOUNTER))) - 2)
100
101 struct tostruct {
102 u_long selfpc;
103 long count;
104 u_short link;
105 u_short pad;
106 };
107
108 /*
109 * a raw arc, with pointers to the calling site and
110 * the called site and a count.
111 */
112 struct rawarc {
113 u_long raw_frompc;
114 u_long raw_selfpc;
115 long raw_count;
116 };
117
118 /*
119 * general rounding functions.
120 */
121 #define ROUNDDOWN(x,y) (((x)/(y))*(y))
122 #define ROUNDUP(x,y) ((((x)+(y)-1)/(y))*(y))
123
124 /*
125 * The profiling data structures are housed in this structure.
126 */
127 struct gmonparam {
128 int state;
129 u_short *kcount;
130 u_long kcountsize;
131 u_short *froms;
132 u_long fromssize;
133 struct tostruct *tos;
134 u_long tossize;
135 long tolimit;
136 u_long lowpc;
137 u_long highpc;
138 u_long textsize;
139 u_long hashfraction;
140 };
141 extern struct gmonparam _gmonparam;
142
143 /*
144 * Possible states of profiling.
145 */
146 #define GMON_PROF_ON 0
147 #define GMON_PROF_BUSY 1
148 #define GMON_PROF_ERROR 2
149 #define GMON_PROF_OFF 3
150
151 /*
152 * Sysctl definitions for extracting profiling information from the kernel.
153 */
154 #define GPROF_STATE 0 /* int: profiling enabling variable */
155 #define GPROF_COUNT 1 /* struct: profile tick count buffer */
156 #define GPROF_FROMS 2 /* struct: from location hash bucket */
157 #define GPROF_TOS 3 /* struct: destination/count structure */
158 #define GPROF_GMONPARAM 4 /* struct: profiling parameters (see above) */
159 #endif /* !_SYS_GMON_H_ */
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