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29 * @(#)gmon.c 8.1 (Berkeley) 6/4/93
30 * $FreeBSD: src/lib/libc/gmon/gmon.c,v 1.22 2007/01/09 00:27:58 imp Exp $
33 #include "namespace.h"
34 #include <sys/param.h>
38 #include <sys/sysctl.h>
46 #include "un-namespace.h"
48 #include "libc_private.h"
50 struct gmonparam _gmonparam = { .state = GMON_PROF_OFF };
53 /* see profil(2) where this is describe (incorrectly) */
54 #define SCALE_1_TO_1 0x10000L
56 #define ERR(s) _write(2, s, sizeof(s))
59 static int hertz(void);
62 monstartup(u_long lowpc, u_long highpc)
66 struct gmonparam *p = &_gmonparam;
69 * round lowpc and highpc to multiples of the density we're using
70 * so the rest of the scaling (here and in gprof) stays in ints.
72 p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
73 p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
74 p->textsize = p->highpc - p->lowpc;
75 p->kcountsize = p->textsize / HISTFRACTION;
76 p->hashfraction = HASHFRACTION;
77 p->fromssize = p->textsize / HASHFRACTION;
78 p->tolimit = p->textsize * ARCDENSITY / 100;
79 if (p->tolimit < MINARCS)
81 else if (p->tolimit > MAXARCS)
83 p->tossize = p->tolimit * sizeof(struct tostruct);
85 cp = mmap(NULL, p->kcountsize + p->fromssize + p->tossize,
86 PROT_READ | PROT_WRITE, MAP_ANON, -1, 0);
87 if (cp == MAP_FAILED) {
88 ERR("monstartup: out of memory\n");
92 bzero(cp, p->kcountsize + p->fromssize + p->tossize);
94 p->tos = (struct tostruct *)cp;
96 p->kcount = (u_short *)cp;
98 p->froms = (u_short *)cp;
102 o = p->highpc - p->lowpc;
103 if (p->kcountsize < o)
104 s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
106 s_scale = SCALE_1_TO_1;
119 struct rawarc rawarc;
120 struct gmonparam *p = &_gmonparam;
121 struct gmonhdr gmonhdr, *hdr;
122 struct clockinfo clockinfo;
131 if (p->state == GMON_PROF_ERROR)
132 ERR("_mcleanup: tos overflow\n");
134 size = sizeof(clockinfo);
136 mib[1] = KERN_CLOCKRATE;
137 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) {
141 clockinfo.profhz = hertz();
142 } else if (clockinfo.profhz == 0) {
143 if (clockinfo.hz != 0)
144 clockinfo.profhz = clockinfo.hz;
146 clockinfo.profhz = hertz();
150 snprintf(outname, sizeof(outname), "%s.gmon", _getprogname());
151 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0666);
153 _warn("_mcleanup: %s", outname);
157 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0664);
159 _warn("_mcleanup: gmon.log");
162 len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n",
163 p->kcount, p->kcountsize);
164 _write(log, buf, len);
166 hdr = (struct gmonhdr *)&gmonhdr;
167 bzero(hdr, sizeof(*hdr));
169 hdr->hpc = p->highpc;
170 hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
171 hdr->version = GMONVERSION;
172 hdr->profrate = clockinfo.profhz;
173 _write(fd, (char *)hdr, sizeof *hdr);
174 _write(fd, p->kcount, p->kcountsize);
175 endfrom = p->fromssize / sizeof(*p->froms);
176 for (fromindex = 0; fromindex < endfrom; fromindex++) {
177 if (p->froms[fromindex] == 0)
181 frompc += fromindex * p->hashfraction * sizeof(*p->froms);
182 for (toindex = p->froms[fromindex]; toindex != 0;
183 toindex = p->tos[toindex].link) {
186 "[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" ,
187 frompc, p->tos[toindex].selfpc,
188 p->tos[toindex].count);
189 _write(log, buf, len);
191 rawarc.raw_frompc = frompc;
192 rawarc.raw_selfpc = p->tos[toindex].selfpc;
193 rawarc.raw_count = p->tos[toindex].count;
194 _write(fd, &rawarc, sizeof rawarc);
202 * profiling is what mcount checks to see if
203 * all the data structures are ready.
208 struct gmonparam *p = &_gmonparam;
212 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale);
213 p->state = GMON_PROF_ON;
216 profil(NULL, 0, 0, 0);
217 p->state = GMON_PROF_OFF;
222 * discover the tick frequency of the machine
223 * if something goes wrong, we return 0, an impossible hertz.
228 struct itimerval tim;
230 tim.it_interval.tv_sec = 0;
231 tim.it_interval.tv_usec = 1;
232 tim.it_value.tv_sec = 0;
233 tim.it_value.tv_usec = 0;
234 setitimer(ITIMER_REAL, &tim, 0);
235 setitimer(ITIMER_REAL, 0, &tim);
236 if (tim.it_interval.tv_usec < 2)
238 return (1000000 / tim.it_interval.tv_usec);