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31 * @(#)gmon.h 8.2 (Berkeley) 1/4/94
37 #include <machine/profile.h>
40 * Structure prepended to gmon.out profiling data file.
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 histcounter_type; /* size (in bits) and sign of HISTCOUNTER */
49 int spare[2]; /* reserved */
51 #define GMONVERSION 0x00051879
54 * Type of histogram counters used in the kernel.
57 #define HISTCOUNTER int64_t
59 #define HISTCOUNTER unsigned short
63 * Fraction of text space to allocate for histogram counters.
64 * We allocate counters at the same or higher density as function
65 * addresses, so that each counter belongs to a unique function.
66 * A lower density of counters would give less resolution but a
67 * higher density would be wasted.
69 #define HISTFRACTION (FUNCTION_ALIGNMENT / sizeof(HISTCOUNTER) == 0 \
70 ? 1 : FUNCTION_ALIGNMENT / sizeof(HISTCOUNTER))
73 * Fraction of text space to allocate for from hash buckets.
74 * The value of HASHFRACTION is based on the minimum number of bytes
75 * of separation between two subroutine call points in the object code.
76 * Given MIN_SUBR_SEPARATION bytes of separation the value of
77 * HASHFRACTION is calculated as:
79 * HASHFRACTION = MIN_SUBR_SEPARATION / (2 * sizeof(short) - 1);
81 * For example, on the VAX, the shortest two call sequence is:
86 * which is separated by only three bytes, thus HASHFRACTION is
89 * HASHFRACTION = 3 / (2 * 2 - 1) = 1
91 * Note that the division above rounds down, thus if MIN_SUBR_FRACTION
92 * is less than three, this algorithm will not work!
94 * In practice, however, call instructions are rarely at a minimal
95 * distance. Hence, we will define HASHFRACTION to be 2 across all
96 * architectures. This saves a reasonable amount of space for
97 * profiling data structures without (in practice) sacrificing
101 * XXX I think the above analysis completely misses the point. I think
102 * the point is that addresses in different functions must hash to
103 * different values. Since the hash is essentially division by
104 * sizeof(unsigned short), the correct formula is:
106 * HASHFRACTION = MIN_FUNCTION_ALIGNMENT / sizeof(unsigned short)
108 * Note that he unsigned short here has nothing to do with the one for
111 * Hash collisions from a two call sequence don't matter. They get
112 * handled like collisions for calls to different addresses from the
113 * same address through a function pointer.
115 #define HASHFRACTION (FUNCTION_ALIGNMENT / sizeof(unsigned short) == 0 \
116 ? 1 : FUNCTION_ALIGNMENT / sizeof(unsigned short))
119 * percent of text space to allocate for tostructs with a minimum.
125 * Limit on the number of arcs to so that arc numbers can be stored in
126 * `*froms' and stored and incremented without overflow in links.
128 #define MAXARCS (((u_long)1 << (8 * sizeof(u_short))) - 2)
138 * a raw arc, with pointers to the calling site and
139 * the called site and a count.
148 * general rounding functions.
150 #define ROUNDDOWN(x,y) rounddown(x,y)
151 #define ROUNDUP(x,y) roundup(x,y)
154 * The profiling data structures are housed in this structure.
162 struct tostruct *tos;
169 int profrate; /* XXX wrong type to match gmonhdr */
170 HISTCOUNTER *cputime_count;
171 int cputime_overhead;
172 HISTCOUNTER *mcount_count;
174 int mcount_post_overhead;
175 int mcount_pre_overhead;
176 HISTCOUNTER *mexitcount_count;
177 int mexitcount_overhead;
178 int mexitcount_post_overhead;
179 int mexitcount_pre_overhead;
180 int histcounter_type;
182 extern struct gmonparam _gmonparam;
185 * Possible states of profiling.
187 #define GMON_PROF_ON 0
188 #define GMON_PROF_BUSY 1
189 #define GMON_PROF_ERROR 2
190 #define GMON_PROF_OFF 3
191 #define GMON_PROF_HIRES 4
194 * Sysctl definitions for extracting profiling information from the kernel.
196 #define GPROF_STATE 0 /* int: profiling enabling variable */
197 #define GPROF_COUNT 1 /* struct: profile tick count buffer */
198 #define GPROF_FROMS 2 /* struct: from location hash bucket */
199 #define GPROF_TOS 3 /* struct: destination/count structure */
200 #define GPROF_GMONPARAM 4 /* struct: profiling parameters (see above) */
204 #define KCOUNT(p,index) \
205 ((p)->kcount[(index) / (HISTFRACTION * sizeof(HISTCOUNTER))])
206 #define PC_TO_I(p, pc) ((uintfptr_t)(pc) - (uintfptr_t)(p)->lowpc)
210 #define CALIB_SCALE 1000
212 extern int cputime_bias;
215 void nullfunc_loop_profiled(void);
216 void nullfunc_profiled(void);
217 void startguprof(struct gmonparam *p);
218 void stopguprof(struct gmonparam *p);
222 #define startguprof(p)
223 #define stopguprof(p)
227 void empty_loop(void);
228 void kmupetext(uintfptr_t nhighpc);
229 void mexitcount(uintfptr_t selfpc);
231 void nullfunc_loop(void);
235 #include <sys/cdefs.h>
238 void moncontrol(int);
239 void monstartup(u_long, u_long);
244 #endif /* !_SYS_GMON_H_ */