1 /* $OpenBSD: gmon.h,v 1.3 1996/04/21 22:31:46 deraadt Exp $ */
2 /* $NetBSD: gmon.h,v 1.5 1996/04/09 20:55:30 cgd Exp $ */
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36 * @(#)gmon.h 8.2 (Berkeley) 1/4/94
49 * Structure prepended to gmon.out profiling data file.
52 u_long lpc; /* base pc address of sample buffer */
53 u_long hpc; /* max pc address of sampled buffer */
54 int ncnt; /* size of sample buffer (plus this header) */
55 int version; /* version number */
56 int profrate; /* profiling clock rate */
57 int spare[3]; /* reserved */
59 #define GMONVERSION 0x00051879
62 * histogram counters are unsigned shorts (according to the kernel).
64 #define HISTCOUNTER unsigned short
67 * fraction of text space to allocate for histogram counters here, 1/2
69 #define HISTFRACTION 2
72 * Fraction of text space to allocate for from hash buckets.
73 * The value of HASHFRACTION is based on the minimum number of bytes
74 * of separation between two subroutine call points in the object code.
75 * Given MIN_SUBR_SEPARATION bytes of separation the value of
76 * HASHFRACTION is calculated as:
78 * HASHFRACTION = MIN_SUBR_SEPARATION / (2 * sizeof(short) - 1);
80 * For example, on the VAX, the shortest two call sequence is:
85 * which is separated by only three bytes, thus HASHFRACTION is
88 * HASHFRACTION = 3 / (2 * 2 - 1) = 1
90 * Note that the division above rounds down, thus if MIN_SUBR_FRACTION
91 * is less than three, this algorithm will not work!
93 * In practice, however, call instructions are rarely at a minimal
94 * distance. Hence, we will define HASHFRACTION to be 2 across all
95 * architectures. This saves a reasonable amount of space for
96 * profiling data structures without (in practice) sacrificing
99 #define HASHFRACTION 2
102 * percent of text space to allocate for tostructs with a minimum.
106 #define MAXARCS ((1 << (8 * sizeof(HISTCOUNTER))) - 2)
116 * a raw arc, with pointers to the calling site and
117 * the called site and a count.
126 * general rounding functions.
128 #define ROUNDDOWN(x,y) (((x)/(y))*(y))
129 #define ROUNDUP(x,y) ((((x)+(y)-1)/(y))*(y))
132 * The profiling data structures are housed in this structure.
140 struct tostruct *tos;
148 extern struct gmonparam _gmonparam;
151 * Possible states of profiling.
153 #define GMON_PROF_ON 0
154 #define GMON_PROF_BUSY 1
155 #define GMON_PROF_ERROR 2
156 #define GMON_PROF_OFF 3
159 * Sysctl definitions for extracting profiling information from the kernel.
161 #define GPROF_STATE 0 /* int: profiling enabling variable */
162 #define GPROF_COUNT 1 /* struct: profile tick count buffer */
163 #define GPROF_FROMS 2 /* struct: from location hash bucket */
164 #define GPROF_TOS 3 /* struct: destination/count structure */
165 #define GPROF_GMONPARAM 4 /* struct: profiling parameters (see above) */
166 #endif /* !_SYS_GMONH_ */