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35 #include <machine/profile.h>
38 * Structure prepended to gmon.out profiling data file.
41 u_long lpc; /* base pc address of sample buffer */
42 u_long hpc; /* max pc address of sampled buffer */
43 int ncnt; /* size of sample buffer (plus this header) */
44 int version; /* version number */
45 int profrate; /* profiling clock rate */
46 int histcounter_type; /* size (in bits) and sign of HISTCOUNTER */
47 int spare[2]; /* reserved */
49 #define GMONVERSION 0x00051879
52 * Type of histogram counters used in the kernel.
55 #define HISTCOUNTER int64_t
57 #define HISTCOUNTER unsigned short
61 * Fraction of text space to allocate for histogram counters.
62 * We allocate counters at the same or higher density as function
63 * addresses, so that each counter belongs to a unique function.
64 * A lower density of counters would give less resolution but a
65 * higher density would be wasted.
67 #define HISTFRACTION (FUNCTION_ALIGNMENT / sizeof(HISTCOUNTER) == 0 \
68 ? 1 : FUNCTION_ALIGNMENT / sizeof(HISTCOUNTER))
71 * Fraction of text space to allocate for from hash buckets.
72 * The value of HASHFRACTION is based on the minimum number of bytes
73 * of separation between two subroutine call points in the object code.
74 * Given MIN_SUBR_SEPARATION bytes of separation the value of
75 * HASHFRACTION is calculated as:
77 * HASHFRACTION = MIN_SUBR_SEPARATION / (2 * sizeof(short) - 1);
79 * For example, on the VAX, the shortest two call sequence is:
84 * which is separated by only three bytes, thus HASHFRACTION is
87 * HASHFRACTION = 3 / (2 * 2 - 1) = 1
89 * Note that the division above rounds down, thus if MIN_SUBR_FRACTION
90 * is less than three, this algorithm will not work!
92 * In practice, however, call instructions are rarely at a minimal
93 * distance. Hence, we will define HASHFRACTION to be 2 across all
94 * architectures. This saves a reasonable amount of space for
95 * profiling data structures without (in practice) sacrificing
99 * XXX I think the above analysis completely misses the point. I think
100 * the point is that addresses in different functions must hash to
101 * different values. Since the hash is essentially division by
102 * sizeof(unsigned short), the correct formula is:
104 * HASHFRACTION = MIN_FUNCTION_ALIGNMENT / sizeof(unsigned short)
106 * Note that he unsigned short here has nothing to do with the one for
109 * Hash collisions from a two call sequence don't matter. They get
110 * handled like collisions for calls to different addresses from the
111 * same address through a function pointer.
113 #define HASHFRACTION (FUNCTION_ALIGNMENT / sizeof(unsigned short) == 0 \
114 ? 1 : FUNCTION_ALIGNMENT / sizeof(unsigned short))
117 * percent of text space to allocate for tostructs with a minimum.
123 * Limit on the number of arcs to so that arc numbers can be stored in
124 * `*froms' and stored and incremented without overflow in links.
126 #define MAXARCS (((u_long)1 << (8 * sizeof(u_short))) - 2)
136 * a raw arc, with pointers to the calling site and
137 * the called site and a count.
146 * general rounding functions.
148 #define ROUNDDOWN(x,y) rounddown(x,y)
149 #define ROUNDUP(x,y) roundup(x,y)
152 * The profiling data structures are housed in this structure.
160 struct tostruct *tos;
167 int profrate; /* XXX wrong type to match gmonhdr */
168 HISTCOUNTER *cputime_count;
169 int cputime_overhead;
170 HISTCOUNTER *mcount_count;
172 int mcount_post_overhead;
173 int mcount_pre_overhead;
174 HISTCOUNTER *mexitcount_count;
175 int mexitcount_overhead;
176 int mexitcount_post_overhead;
177 int mexitcount_pre_overhead;
178 int histcounter_type;
180 extern struct gmonparam _gmonparam;
183 * Possible states of profiling.
185 #define GMON_PROF_ON 0
186 #define GMON_PROF_BUSY 1
187 #define GMON_PROF_ERROR 2
188 #define GMON_PROF_OFF 3
189 #define GMON_PROF_HIRES 4
192 * Sysctl definitions for extracting profiling information from the kernel.
194 #define GPROF_STATE 0 /* int: profiling enabling variable */
195 #define GPROF_COUNT 1 /* struct: profile tick count buffer */
196 #define GPROF_FROMS 2 /* struct: from location hash bucket */
197 #define GPROF_TOS 3 /* struct: destination/count structure */
198 #define GPROF_GMONPARAM 4 /* struct: profiling parameters (see above) */
202 #define KCOUNT(p,index) \
203 ((p)->kcount[(index) / (HISTFRACTION * sizeof(HISTCOUNTER))])
204 #define PC_TO_I(p, pc) ((uintfptr_t)(pc) - (uintfptr_t)(p)->lowpc)
208 #define CALIB_SCALE 1000
210 extern int cputime_bias;
213 void nullfunc_loop_profiled(void);
214 void nullfunc_profiled(void);
215 void startguprof(struct gmonparam *p);
216 void stopguprof(struct gmonparam *p);
220 #define startguprof(p)
221 #define stopguprof(p)
225 void empty_loop(void);
226 void kmupetext(uintfptr_t nhighpc);
227 void mexitcount(uintfptr_t selfpc);
229 void nullfunc_loop(void);
233 #include <sys/cdefs.h>
236 void moncontrol(int);
237 void monstartup(u_long, u_long);
242 #endif /* !_SYS_GMON_H_ */