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33 * @(#)gmon.h 8.2 (Berkeley) 1/4/94
39 #include <machine-gmon.h>
42 * Structure prepended to gmon.out profiling data file.
45 u_long lpc; /* base pc address of sample buffer */
46 u_long hpc; /* max pc address of sampled buffer */
47 int ncnt; /* size of sample buffer (plus this header) */
48 int version; /* version number */
49 int profrate; /* profiling clock rate */
50 int spare[3]; /* reserved */
52 #define GMONVERSION 0x00051879
55 * histogram counters are unsigned shorts (according to the kernel).
57 #define HISTCOUNTER unsigned short
60 * fraction of text space to allocate for histogram counters here, 1/2
62 #define HISTFRACTION 2
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:
71 * HASHFRACTION = MIN_SUBR_SEPARATION / (2 * sizeof(short) - 1);
73 * For example, on the VAX, the shortest two call sequence is:
78 * which is separated by only three bytes, thus HASHFRACTION is
81 * HASHFRACTION = 3 / (2 * 2 - 1) = 1
83 * Note that the division above rounds down, thus if MIN_SUBR_FRACTION
84 * is less than three, this algorithm will not work!
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
92 #define HASHFRACTION 2
95 * percent of text space to allocate for tostructs with a minimum.
99 #define MAXARCS ((1 << (8 * sizeof(HISTCOUNTER))) - 2)
109 * a raw arc, with pointers to the calling site and
110 * the called site and a count.
119 * general rounding functions.
121 #define ROUNDDOWN(x,y) (((x)/(y))*(y))
122 #define ROUNDUP(x,y) ((((x)+(y)-1)/(y))*(y))
125 * The profiling data structures are housed in this structure.
133 struct tostruct *tos;
141 extern struct gmonparam _gmonparam;
144 * Possible states of profiling.
146 #define GMON_PROF_ON 0
147 #define GMON_PROF_BUSY 1
148 #define GMON_PROF_ERROR 2
149 #define GMON_PROF_OFF 3
152 * Sysctl definitions for extracting profiling information from the kernel.
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_ */