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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))
60 static int hertz(void);
63 monstartup(u_long lowpc, u_long highpc)
67 struct gmonparam *p = &_gmonparam;
70 * round lowpc and highpc to multiples of the density we're using
71 * so the rest of the scaling (here and in gprof) stays in ints.
73 p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
74 p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
75 p->textsize = p->highpc - p->lowpc;
76 p->kcountsize = p->textsize / HISTFRACTION;
77 p->hashfraction = HASHFRACTION;
78 p->fromssize = p->textsize / HASHFRACTION;
79 p->tolimit = p->textsize * ARCDENSITY / 100;
80 if (p->tolimit < MINARCS)
82 else if (p->tolimit > MAXARCS)
84 p->tossize = p->tolimit * sizeof(struct tostruct);
86 cp = mmap(NULL, p->kcountsize + p->fromssize + p->tossize,
87 PROT_READ | PROT_WRITE, MAP_ANON, -1, 0);
88 if (cp == MAP_FAILED) {
89 ERR("monstartup: out of memory\n");
93 bzero(cp, p->kcountsize + p->fromssize + p->tossize);
95 p->tos = (struct tostruct *)cp;
97 p->kcount = (u_short *)cp;
99 p->froms = (u_short *)cp;
103 o = p->highpc - p->lowpc;
104 if (p->kcountsize < o)
105 s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
107 s_scale = SCALE_1_TO_1;
120 struct rawarc rawarc;
121 struct gmonparam *p = &_gmonparam;
122 struct gmonhdr gmonhdr, *hdr;
123 struct clockinfo clockinfo;
132 if (p->state == GMON_PROF_ERROR)
133 ERR("_mcleanup: tos overflow\n");
135 size = sizeof(clockinfo);
137 mib[1] = KERN_CLOCKRATE;
138 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) {
142 clockinfo.profhz = hertz();
143 } else if (clockinfo.profhz == 0) {
144 if (clockinfo.hz != 0)
145 clockinfo.profhz = clockinfo.hz;
147 clockinfo.profhz = hertz();
151 snprintf(outname, sizeof(outname), "%s.gmon", _getprogname());
152 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0666);
154 _warn("_mcleanup: %s", outname);
158 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY|O_CLOEXEC, 0664);
160 _warn("_mcleanup: gmon.log");
163 len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n",
164 p->kcount, p->kcountsize);
165 _write(log, buf, len);
167 hdr = (struct gmonhdr *)&gmonhdr;
168 bzero(hdr, sizeof(*hdr));
170 hdr->hpc = p->highpc;
171 hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
172 hdr->version = GMONVERSION;
173 hdr->profrate = clockinfo.profhz;
174 _write(fd, (char *)hdr, sizeof *hdr);
175 _write(fd, p->kcount, p->kcountsize);
176 endfrom = p->fromssize / sizeof(*p->froms);
177 for (fromindex = 0; fromindex < endfrom; fromindex++) {
178 if (p->froms[fromindex] == 0)
182 frompc += fromindex * p->hashfraction * sizeof(*p->froms);
183 for (toindex = p->froms[fromindex]; toindex != 0;
184 toindex = p->tos[toindex].link) {
187 "[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" ,
188 frompc, p->tos[toindex].selfpc,
189 p->tos[toindex].count);
190 _write(log, buf, len);
192 rawarc.raw_frompc = frompc;
193 rawarc.raw_selfpc = p->tos[toindex].selfpc;
194 rawarc.raw_count = p->tos[toindex].count;
195 _write(fd, &rawarc, sizeof rawarc);
203 * profiling is what mcount checks to see if
204 * all the data structures are ready.
209 struct gmonparam *p = &_gmonparam;
213 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale);
214 p->state = GMON_PROF_ON;
217 profil(NULL, 0, 0, 0);
218 p->state = GMON_PROF_OFF;
223 * discover the tick frequency of the machine
224 * if something goes wrong, we return 0, an impossible hertz.
229 struct itimerval tim;
231 tim.it_interval.tv_sec = 0;
232 tim.it_interval.tv_usec = 1;
233 tim.it_value.tv_sec = 0;
234 tim.it_value.tv_usec = 0;
235 setitimer(ITIMER_REAL, &tim, 0);
236 setitimer(ITIMER_REAL, 0, &tim);
237 if (tim.it_interval.tv_usec < 2)
239 return (1000000 / tim.it_interval.tv_usec);