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29 * @(#)gmon.h 8.2 (Berkeley) 1/4/94
37 #include <sys/types.h>
40 * See gmon_out.h for gmon.out format.
43 /* structure emitted by "gcc -a". This must match struct bb in
44 gcc/libgcc2.c. It is OK for gcc to declare a longer structure as
45 long as the members below are present. */
53 const unsigned long *addresses;
56 extern struct __bb *__bb_head;
59 * histogram counters are unsigned shorts (according to the kernel).
61 #define HISTCOUNTER unsigned short
64 * fraction of text space to allocate for histogram counters here, 1/2
66 #define HISTFRACTION 2
69 * Fraction of text space to allocate for from hash buckets.
70 * The value of HASHFRACTION is based on the minimum number of bytes
71 * of separation between two subroutine call points in the object code.
72 * Given MIN_SUBR_SEPARATION bytes of separation the value of
73 * HASHFRACTION is calculated as:
75 * HASHFRACTION = MIN_SUBR_SEPARATION / (2 * sizeof(short) - 1);
77 * For example, on the VAX, the shortest two call sequence is:
82 * which is separated by only three bytes, thus HASHFRACTION is
85 * HASHFRACTION = 3 / (2 * 2 - 1) = 1
87 * Note that the division above rounds down, thus if MIN_SUBR_FRACTION
88 * is less than three, this algorithm will not work!
90 * In practice, however, call instructions are rarely at a minimal
91 * distance. Hence, we will define HASHFRACTION to be 2 across all
92 * architectures. This saves a reasonable amount of space for
93 * profiling data structures without (in practice) sacrificing
96 #define HASHFRACTION 2
99 * percent of text space to allocate for tostructs with a minimum.
103 #define MAXARCS ((1 << (8 * sizeof(HISTCOUNTER))) - 2)
113 * a raw arc, with pointers to the calling site and
114 * the called site and a count.
123 * general rounding functions.
125 #define ROUNDDOWN(x,y) (((x)/(y))*(y))
126 #define ROUNDUP(x,y) ((((x)+(y)-1)/(y))*(y))
129 * The profiling data structures are housed in this structure.
137 struct tostruct *tos;
144 long log_hashfraction;
146 extern struct gmonparam _gmonparam;
149 * Possible states of profiling.
151 #define GMON_PROF_ON 0
152 #define GMON_PROF_BUSY 1
153 #define GMON_PROF_ERROR 2
154 #define GMON_PROF_OFF 3
157 * Sysctl definitions for extracting profiling information from the kernel.
159 #define GPROF_STATE 0 /* int: profiling enabling variable */
160 #define GPROF_COUNT 1 /* struct: profile tick count buffer */
161 #define GPROF_FROMS 2 /* struct: from location hash bucket */
162 #define GPROF_TOS 3 /* struct: destination/count structure */
163 #define GPROF_GMONPARAM 4 /* struct: profiling parameters (see above) */
167 /* Set up data structures and start profiling. */
168 extern void __monstartup __P ((u_long __lowpc, u_long __highpc));
169 extern void monstartup __P ((u_long __lowpc, u_long __highpc));
171 /* Clean up profiling and write out gmon.out. */
172 extern void _mcleanup __P ((void));
176 #endif /* sys/gmon.h */