gmon.c revision 1.6
1238106Sdes/* $NetBSD: gmon.c,v 1.6 1996/06/12 04:15:34 cgd Exp $ */ 2238106Sdes 3238106Sdes/*- 4238106Sdes * Copyright (c) 1983, 1992, 1993 5238106Sdes * The Regents of the University of California. All rights reserved. 6238106Sdes * 7238106Sdes * Redistribution and use in source and binary forms, with or without 8238106Sdes * modification, are permitted provided that the following conditions 9238106Sdes * are met: 10238106Sdes * 1. Redistributions of source code must retain the above copyright 11238106Sdes * notice, this list of conditions and the following disclaimer. 12238106Sdes * 2. Redistributions in binary form must reproduce the above copyright 13238106Sdes * notice, this list of conditions and the following disclaimer in the 14238106Sdes * documentation and/or other materials provided with the distribution. 15238106Sdes * 3. All advertising materials mentioning features or use of this software 16238106Sdes * must display the following acknowledgement: 17238106Sdes * This product includes software developed by the University of 18238106Sdes * California, Berkeley and its contributors. 19238106Sdes * 4. Neither the name of the University nor the names of its contributors 20238106Sdes * may be used to endorse or promote products derived from this software 21238106Sdes * without specific prior written permission. 22238106Sdes * 23238106Sdes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24266114Sdes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25266114Sdes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26266114Sdes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27266114Sdes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28266114Sdes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29266114Sdes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30266114Sdes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31266114Sdes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32266114Sdes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33266114Sdes * SUCH DAMAGE. 34238106Sdes */ 35238106Sdes 36238106Sdes#if !defined(lint) && defined(LIBC_SCCS) 37238106Sdes#if 0 38238106Sdesstatic char sccsid[] = "@(#)gmon.c 8.1 (Berkeley) 6/4/93"; 39238106Sdes#else 40266114Sdesstatic char rcsid[] = "$NetBSD: gmon.c,v 1.6 1996/06/12 04:15:34 cgd Exp $"; 41266114Sdes#endif 42266114Sdes#endif 43266114Sdes 44266114Sdes#include <sys/param.h> 45266114Sdes#include <sys/time.h> 46266114Sdes#include <sys/gmon.h> 47266114Sdes#include <sys/sysctl.h> 48266114Sdes 49266114Sdes#include <stdio.h> 50266114Sdes#include <stdlib.h> 51266114Sdes#include <fcntl.h> 52266114Sdes#include <limits.h> 53266114Sdes#include <unistd.h> 54266114Sdes 55266114Sdesextern char *minbrk asm ("minbrk"); 56266114Sdes 57266114Sdesstruct gmonparam _gmonparam = { GMON_PROF_OFF }; 58266114Sdes 59266114Sdesstatic int s_scale; 60266114Sdes/* see profil(2) where this is describe (incorrectly) */ 61266114Sdes#define SCALE_1_TO_1 0x10000L 62266114Sdes 63266114Sdes#define ERR(s) write(2, s, sizeof(s)) 64266114Sdes 65266114Sdesvoid moncontrol __P((int)); 66266114Sdesstatic int hertz __P((void)); 67266114Sdes 68266114Sdesvoid 69266114Sdesmonstartup(lowpc, highpc) 70266114Sdes u_long lowpc; 71266114Sdes u_long highpc; 72266114Sdes{ 73266114Sdes register int o; 74266114Sdes char *cp; 75266114Sdes struct gmonparam *p = &_gmonparam; 76266114Sdes 77266114Sdes /* 78266114Sdes * round lowpc and highpc to multiples of the density we're using 79266114Sdes * so the rest of the scaling (here and in gprof) stays in ints. 80266114Sdes */ 81266114Sdes p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER)); 82266114Sdes p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER)); 83266114Sdes p->textsize = p->highpc - p->lowpc; 84266114Sdes p->kcountsize = p->textsize / HISTFRACTION; 85266114Sdes p->hashfraction = HASHFRACTION; 86266114Sdes p->fromssize = p->textsize / p->hashfraction; 87266114Sdes p->tolimit = p->textsize * ARCDENSITY / 100; 88266114Sdes if (p->tolimit < MINARCS) 89266114Sdes p->tolimit = MINARCS; 90266114Sdes else if (p->tolimit > MAXARCS) 91266114Sdes p->tolimit = MAXARCS; 92266114Sdes p->tossize = p->tolimit * sizeof(struct tostruct); 93266114Sdes 94266114Sdes cp = sbrk(p->kcountsize + p->fromssize + p->tossize); 95266114Sdes if (cp == (char *)-1) { 96266114Sdes ERR("monstartup: out of memory\n"); 97266114Sdes return; 98266114Sdes } 99266114Sdes#ifdef notdef 100266114Sdes bzero(cp, p->kcountsize + p->fromssize + p->tossize); 101266114Sdes#endif 102266114Sdes p->tos = (struct tostruct *)cp; 103266114Sdes cp += p->tossize; 104266114Sdes p->kcount = (u_short *)cp; 105266114Sdes cp += p->kcountsize; 106266114Sdes p->froms = (u_short *)cp; 107266114Sdes 108266114Sdes minbrk = sbrk(0); 109266114Sdes p->tos[0].link = 0; 110266114Sdes 111266114Sdes o = p->highpc - p->lowpc; 112266114Sdes if (p->kcountsize < o) { 113266114Sdes#ifndef notdef 114266114Sdes s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1; 115266114Sdes#else /* avoid floating point */ 116266114Sdes int quot = o / p->kcountsize; 117266114Sdes 118266114Sdes if (quot >= 0x10000) 119266114Sdes s_scale = 1; 120266114Sdes else if (quot >= 0x100) 121266114Sdes s_scale = 0x10000 / quot; 122266114Sdes else if (o >= 0x800000) 123266114Sdes s_scale = 0x1000000 / (o / (p->kcountsize >> 8)); 124266114Sdes else 125266114Sdes s_scale = 0x1000000 / ((o << 8) / p->kcountsize); 126266114Sdes#endif 127266114Sdes } else 128266114Sdes s_scale = SCALE_1_TO_1; 129266114Sdes 130266114Sdes moncontrol(1); 131266114Sdes} 132266114Sdes 133266114Sdesvoid 134266114Sdes_mcleanup() 135266114Sdes{ 136266114Sdes int fd; 137266114Sdes int fromindex; 138266114Sdes int endfrom; 139266114Sdes u_long frompc; 140266114Sdes int toindex; 141266114Sdes struct rawarc rawarc; 142266114Sdes struct gmonparam *p = &_gmonparam; 143266114Sdes struct gmonhdr gmonhdr, *hdr; 144266114Sdes struct clockinfo clockinfo; 145266114Sdes int mib[2]; 146266114Sdes size_t size; 147266114Sdes char *profdir; 148266114Sdes char *proffile; 149266114Sdes char buf[PATH_MAX]; 150266114Sdes#ifdef DEBUG 151266114Sdes int log, len; 152238106Sdes char buf[200]; 153238106Sdes#endif 154238106Sdes 155238106Sdes if (p->state == GMON_PROF_ERROR) 156238106Sdes ERR("_mcleanup: tos overflow\n"); 157238106Sdes 158238106Sdes size = sizeof(clockinfo); 159266114Sdes mib[0] = CTL_KERN; 160238106Sdes mib[1] = KERN_CLOCKRATE; 161238106Sdes if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) { 162238106Sdes /* 163238106Sdes * Best guess 164238106Sdes */ 165238106Sdes clockinfo.profhz = hertz(); 166238106Sdes } else if (clockinfo.profhz == 0) { 167238106Sdes if (clockinfo.hz != 0) 168238106Sdes clockinfo.profhz = clockinfo.hz; 169238106Sdes else 170238106Sdes clockinfo.profhz = hertz(); 171238106Sdes } 172238106Sdes 173238106Sdes moncontrol(0); 174238106Sdes 175238106Sdes if ((profdir = getenv("PROFDIR")) != NULL) { 176238106Sdes extern char *__progname; 177238106Sdes char *s, *t; 178238106Sdes pid_t pid; 179238106Sdes long divisor; 180238106Sdes 181238106Sdes /* If PROFDIR contains a null value, no profiling 182238106Sdes output is produced */ 183238106Sdes if (*profdir == '\0') { 184238106Sdes return; 185238106Sdes } 186238106Sdes 187238106Sdes t = buf; 188238106Sdes s = profdir; 189238106Sdes while((*t = *s) != '\0') { 190238106Sdes t++; 191238106Sdes s++; 192238106Sdes } 193238106Sdes *t++ = '/'; 194238106Sdes 195238106Sdes /* 196238106Sdes * Copy and convert pid from a pid_t to a string. For 197238106Sdes * best performance, divisor should be initialized to 198238106Sdes * the largest power of 10 less than PID_MAX. 199238106Sdes */ 200238106Sdes pid = getpid(); 201238106Sdes divisor=10000; 202238106Sdes while (divisor > pid) divisor /= 10; /* skip leading zeros */ 203238106Sdes do { 204238106Sdes *t++ = (pid/divisor) + '0'; 205238106Sdes pid %= divisor; 206238106Sdes } while (divisor /= 10); 207238106Sdes *t++ = '.'; 208238106Sdes 209238106Sdes s = __progname; 210238106Sdes while ((*t++ = *s++) != '\0') 211238106Sdes ; 212238106Sdes 213238106Sdes proffile = buf; 214238106Sdes } else { 215276605Sdes proffile = "gmon.out"; 216276605Sdes } 217238106Sdes 218238106Sdes fd = open(proffile , O_CREAT|O_TRUNC|O_WRONLY, 0666); 219238106Sdes if (fd < 0) { 220238106Sdes perror( proffile ); 221238106Sdes return; 222238106Sdes } 223238106Sdes#ifdef DEBUG 224238106Sdes log = open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664); 225238106Sdes if (log < 0) { 226238106Sdes perror("mcount: gmon.log"); 227238106Sdes return; 228238106Sdes } 229276605Sdes len = sprintf(buf, "[mcleanup1] kcount 0x%x ssiz %d\n", 230238106Sdes p->kcount, p->kcountsize); 231238106Sdes write(log, buf, len); 232238106Sdes#endif 233238106Sdes hdr = (struct gmonhdr *)&gmonhdr; 234238106Sdes hdr->lpc = p->lowpc; 235238106Sdes hdr->hpc = p->highpc; 236238106Sdes hdr->ncnt = p->kcountsize + sizeof(gmonhdr); 237238106Sdes hdr->version = GMONVERSION; 238238106Sdes hdr->profrate = clockinfo.profhz; 239238106Sdes write(fd, (char *)hdr, sizeof *hdr); 240238106Sdes write(fd, p->kcount, p->kcountsize); 241238106Sdes endfrom = p->fromssize / sizeof(*p->froms); 242238106Sdes for (fromindex = 0; fromindex < endfrom; fromindex++) { 243238106Sdes if (p->froms[fromindex] == 0) 244238106Sdes continue; 245238106Sdes 246238106Sdes frompc = p->lowpc; 247238106Sdes frompc += fromindex * p->hashfraction * sizeof(*p->froms); 248238106Sdes for (toindex = p->froms[fromindex]; toindex != 0; 249238106Sdes toindex = p->tos[toindex].link) { 250238106Sdes#ifdef DEBUG 251238106Sdes len = sprintf(buf, 252238106Sdes "[mcleanup2] frompc 0x%x selfpc 0x%x count %d\n" , 253238106Sdes frompc, p->tos[toindex].selfpc, 254238106Sdes p->tos[toindex].count); 255238106Sdes write(log, buf, len); 256238106Sdes#endif 257238106Sdes rawarc.raw_frompc = frompc; 258238106Sdes rawarc.raw_selfpc = p->tos[toindex].selfpc; 259276605Sdes rawarc.raw_count = p->tos[toindex].count; 260238106Sdes write(fd, &rawarc, sizeof rawarc); 261238106Sdes } 262238106Sdes } 263238106Sdes close(fd); 264238106Sdes} 265238106Sdes 266276605Sdes/* 267238106Sdes * Control profiling 268238106Sdes * profiling is what mcount checks to see if 269238106Sdes * all the data structures are ready. 270238106Sdes */ 271238106Sdesvoid 272238106Sdesmoncontrol(mode) 273238106Sdes int mode; 274238106Sdes{ 275238106Sdes struct gmonparam *p = &_gmonparam; 276238106Sdes 277238106Sdes if (mode) { 278238106Sdes /* start */ 279238106Sdes profil((char *)p->kcount, p->kcountsize, p->lowpc, 280238106Sdes s_scale); 281238106Sdes p->state = GMON_PROF_ON; 282238106Sdes } else { 283238106Sdes /* stop */ 284276605Sdes profil((char *)0, 0, 0, 0); 285238106Sdes p->state = GMON_PROF_OFF; 286238106Sdes } 287238106Sdes} 288238106Sdes 289238106Sdes/* 290238106Sdes * discover the tick frequency of the machine 291276605Sdes * if something goes wrong, we return 0, an impossible hertz. 292276605Sdes */ 293238106Sdesstatic int 294238106Sdeshertz() 295238106Sdes{ 296238106Sdes struct itimerval tim; 297266114Sdes 298238106Sdes tim.it_interval.tv_sec = 0; 299238106Sdes tim.it_interval.tv_usec = 1; 300238106Sdes tim.it_value.tv_sec = 0; 301238106Sdes tim.it_value.tv_usec = 0; 302238106Sdes setitimer(ITIMER_REAL, &tim, 0); 303238106Sdes setitimer(ITIMER_REAL, 0, &tim); 304238106Sdes if (tim.it_interval.tv_usec < 2) 305238106Sdes return(0); 306238106Sdes return (1000000 / tim.it_interval.tv_usec); 307266114Sdes} 308238106Sdes 309238106Sdes 310238106Sdes