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33 * $FreeBSD: src/lib/libc/gmon/gmon.c,v 1.8 2000/01/27 23:06:25 jasone Exp $
34 * $DragonFly: src/lib/libc/gmon/gmon.c,v 1.6 2005/01/31 22:29:17 dillon Exp $
36 * @(#)gmon.c 8.1 (Berkeley) 6/4/93
39 #include "namespace.h"
40 #include <sys/param.h>
43 #include <sys/sysctl.h>
51 #include "un-namespace.h"
53 #if defined(__i386__) || defined(__amd64__)
54 extern char *minbrk asm (".minbrk");
56 extern char *minbrk asm ("minbrk");
59 extern char *__progname;
61 struct gmonparam _gmonparam = { GMON_PROF_OFF };
64 /* see profil(2) where this is describe (incorrectly) */
65 #define SCALE_1_TO_1 0x10000L
67 #define ERR(s) _write(2, s, sizeof(s))
69 void moncontrol (int);
70 static int hertz (void);
73 monstartup(lowpc, highpc)
79 struct gmonparam *p = &_gmonparam;
82 * round lowpc and highpc to multiples of the density we're using
83 * so the rest of the scaling (here and in gprof) stays in ints.
85 p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
86 p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
87 p->textsize = p->highpc - p->lowpc;
88 p->kcountsize = p->textsize / HISTFRACTION;
89 p->hashfraction = HASHFRACTION;
90 p->fromssize = p->textsize / HASHFRACTION;
91 p->tolimit = p->textsize * ARCDENSITY / 100;
92 if (p->tolimit < MINARCS)
94 else if (p->tolimit > MAXARCS)
96 p->tossize = p->tolimit * sizeof(struct tostruct);
98 cp = sbrk(p->kcountsize + p->fromssize + p->tossize);
99 if (cp == (char *)-1) {
100 ERR("monstartup: out of memory\n");
104 bzero(cp, p->kcountsize + p->fromssize + p->tossize);
106 p->tos = (struct tostruct *)cp;
108 p->kcount = (u_short *)cp;
110 p->froms = (u_short *)cp;
115 o = p->highpc - p->lowpc;
116 if (p->kcountsize < o) {
118 s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
119 #else /* avoid floating point */
120 int quot = o / p->kcountsize;
124 else if (quot >= 0x100)
125 s_scale = 0x10000 / quot;
126 else if (o >= 0x800000)
127 s_scale = 0x1000000 / (o / (p->kcountsize >> 8));
129 s_scale = 0x1000000 / ((o << 8) / p->kcountsize);
132 s_scale = SCALE_1_TO_1;
145 struct rawarc rawarc;
146 struct gmonparam *p = &_gmonparam;
147 struct gmonhdr gmonhdr, *hdr;
148 struct clockinfo clockinfo;
157 if (p->state == GMON_PROF_ERROR)
158 ERR("_mcleanup: tos overflow\n");
160 size = sizeof(clockinfo);
162 mib[1] = KERN_CLOCKRATE;
163 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) {
167 clockinfo.profhz = hertz();
168 } else if (clockinfo.profhz == 0) {
169 if (clockinfo.hz != 0)
170 clockinfo.profhz = clockinfo.hz;
172 clockinfo.profhz = hertz();
176 snprintf(outname,sizeof(outname),"%s.gmon",__progname);
177 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY, 0666);
179 warnx("_mcleanup: %s - %s",outname,strerror(errno));
183 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664);
185 perror("_mcleanup: gmon.log");
188 len = sprintf(buf, "[mcleanup1] kcount 0x%x ssiz %d\n",
189 p->kcount, p->kcountsize);
190 _write(log, buf, len);
192 hdr = (struct gmonhdr *)&gmonhdr;
194 hdr->hpc = p->highpc;
195 hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
196 hdr->version = GMONVERSION;
197 hdr->profrate = clockinfo.profhz;
198 _write(fd, (char *)hdr, sizeof *hdr);
199 _write(fd, p->kcount, p->kcountsize);
200 endfrom = p->fromssize / sizeof(*p->froms);
201 for (fromindex = 0; fromindex < endfrom; fromindex++) {
202 if (p->froms[fromindex] == 0)
206 frompc += fromindex * p->hashfraction * sizeof(*p->froms);
207 for (toindex = p->froms[fromindex]; toindex != 0;
208 toindex = p->tos[toindex].link) {
211 "[mcleanup2] frompc 0x%x selfpc 0x%x count %d\n" ,
212 frompc, p->tos[toindex].selfpc,
213 p->tos[toindex].count);
214 _write(log, buf, len);
216 rawarc.raw_frompc = frompc;
217 rawarc.raw_selfpc = p->tos[toindex].selfpc;
218 rawarc.raw_count = p->tos[toindex].count;
219 _write(fd, &rawarc, sizeof rawarc);
227 * profiling is what mcount checks to see if
228 * all the data structures are ready.
234 struct gmonparam *p = &_gmonparam;
238 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale);
239 p->state = GMON_PROF_ON;
242 profil((char *)0, 0, 0, 0);
243 p->state = GMON_PROF_OFF;
248 * discover the tick frequency of the machine
249 * if something goes wrong, we return 0, an impossible hertz.
254 struct itimerval tim;
256 tim.it_interval.tv_sec = 0;
257 tim.it_interval.tv_usec = 1;
258 tim.it_value.tv_sec = 0;
259 tim.it_value.tv_usec = 0;
260 setitimer(ITIMER_REAL, &tim, 0);
261 setitimer(ITIMER_REAL, 0, &tim);
262 if (tim.it_interval.tv_usec < 2)
264 return (1000000 / tim.it_interval.tv_usec);