2 * Copyright (c) 1983, 1992, 1993
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30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)gmon.c 8.1 (Berkeley) 6/4/93";
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include "namespace.h"
37 #include <sys/param.h>
41 #include <sys/sysctl.h>
50 #include "un-namespace.h"
52 #include "libc_private.h"
54 struct gmonparam _gmonparam = { GMON_PROF_OFF };
57 /* See profil(2) where this is described (incorrectly). */
58 #define SCALE_SHIFT 16
60 #define ERR(s) _write(2, s, sizeof(s))
63 static int hertz(void);
67 monstartup(u_long lowpc, u_long highpc)
71 struct gmonparam *p = &_gmonparam;
74 * round lowpc and highpc to multiples of the density we're using
75 * so the rest of the scaling (here and in gprof) stays in ints.
77 p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
78 p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
79 p->textsize = p->highpc - p->lowpc;
80 p->kcountsize = p->textsize / HISTFRACTION;
81 p->hashfraction = HASHFRACTION;
82 p->fromssize = p->textsize / HASHFRACTION;
83 p->tolimit = p->textsize * ARCDENSITY / 100;
84 if (p->tolimit < MINARCS)
86 else if (p->tolimit > MAXARCS)
88 p->tossize = p->tolimit * sizeof(struct tostruct);
90 cp = mmap(NULL, p->kcountsize + p->fromssize + p->tossize,
91 PROT_READ | PROT_WRITE, MAP_ANON, -1, 0);
92 if (cp == MAP_FAILED) {
93 ERR("monstartup: out of memory\n");
97 bzero(cp, p->kcountsize + p->fromssize + p->tossize);
99 p->tos = (struct tostruct *)cp;
101 p->kcount = (u_short *)cp;
103 p->froms = (u_short *)cp;
107 o = p->highpc - p->lowpc;
108 s_scale = (p->kcountsize < o) ?
109 ((uintmax_t)p->kcountsize << SCALE_SHIFT) / o : (1 << SCALE_SHIFT);
121 struct rawarc rawarc;
122 struct gmonparam *p = &_gmonparam;
123 struct gmonhdr gmonhdr, *hdr;
124 struct clockinfo clockinfo;
133 if (p->state == GMON_PROF_ERROR)
134 ERR("_mcleanup: tos overflow\n");
136 size = sizeof(clockinfo);
138 mib[1] = KERN_CLOCKRATE;
139 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) {
143 clockinfo.profhz = hertz();
144 } else if (clockinfo.profhz == 0) {
145 if (clockinfo.hz != 0)
146 clockinfo.profhz = clockinfo.hz;
148 clockinfo.profhz = hertz();
152 if (getenv("PROFIL_USE_PID"))
153 snprintf(outname, sizeof(outname), "%s.%d.gmon",
154 _getprogname(), getpid());
156 snprintf(outname, sizeof(outname), "%s.gmon", _getprogname());
158 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0666);
160 _warn("_mcleanup: %s", outname);
164 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0664);
166 _warn("_mcleanup: gmon.log");
169 len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n",
170 p->kcount, p->kcountsize);
171 _write(log, buf, len);
173 hdr = (struct gmonhdr *)&gmonhdr;
174 bzero(hdr, sizeof(*hdr));
176 hdr->hpc = p->highpc;
177 hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
178 hdr->version = GMONVERSION;
179 hdr->profrate = clockinfo.profhz;
180 _write(fd, (char *)hdr, sizeof *hdr);
181 _write(fd, p->kcount, p->kcountsize);
182 endfrom = p->fromssize / sizeof(*p->froms);
183 for (fromindex = 0; fromindex < endfrom; fromindex++) {
184 if (p->froms[fromindex] == 0)
188 frompc += fromindex * p->hashfraction * sizeof(*p->froms);
189 for (toindex = p->froms[fromindex]; toindex != 0;
190 toindex = p->tos[toindex].link) {
193 "[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" ,
194 frompc, p->tos[toindex].selfpc,
195 p->tos[toindex].count);
196 _write(log, buf, len);
198 rawarc.raw_frompc = frompc;
199 rawarc.raw_selfpc = p->tos[toindex].selfpc;
200 rawarc.raw_count = p->tos[toindex].count;
201 _write(fd, &rawarc, sizeof rawarc);
209 * profiling is what mcount checks to see if
210 * all the data structures are ready.
215 struct gmonparam *p = &_gmonparam;
219 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale);
220 p->state = GMON_PROF_ON;
223 profil((char *)0, 0, 0, 0);
224 p->state = GMON_PROF_OFF;
229 * discover the tick frequency of the machine
230 * if something goes wrong, we return 0, an impossible hertz.
235 struct itimerval tim;
237 tim.it_interval.tv_sec = 0;
238 tim.it_interval.tv_usec = 1;
239 tim.it_value.tv_sec = 0;
240 tim.it_value.tv_usec = 0;
241 setitimer(ITIMER_REAL, &tim, 0);
242 setitimer(ITIMER_REAL, 0, &tim);
243 if (tim.it_interval.tv_usec < 2)
245 return (1000000 / tim.it_interval.tv_usec);