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freebsd-nq/usr.sbin/kgmon/kgmon.c
Bruce Evans 912e603778 Implemented non-statistical kernel profiling. This is based on 
looking at a high resolution clock for each of the following events:
function call, function return, interrupt entry, interrupt exit,
and interesting branches.  The differences between the times of
these events are added at appropriate places in a ordinary histogram
(as if very fast statistical profiling sampled the pc at those
places) so that ordinary gprof can be used to analyze the times.

gmon.h:
Histogram counters need to be 4 bytes for microsecond resolutions.
They will need to be larger for the 586 clock.
The comments were vax-centric and wrong even on vaxes.  Does anyone
disagree?

gprof4.c:
The standard gprof should support counters of all integral sizes
and the size of the counter should be in the gmon header.  This
hack will do until then.  (Use gprof4 -u to examine the results
of non-statistical profiling.)

config/*:
Non-statistical profiling is configured with `config -pp'.
`config -p' still gives ordinary profiling.

kgmon/*:
Non-statistical profiling is enabled with `kgmon -B'.  `kgmon -b'
still enables ordinary profiling (and distables non-statistical
profiling) if non-statistical profiling is configured.
1995-12-29 15:30:05 +00:00

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/*
* Copyright (c) 1983, 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1983, 1992, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)kgmon.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#include <sys/param.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/sysctl.h>
#include <sys/gmon.h>
#include <errno.h>
#include <kvm.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <nlist.h>
#include <ctype.h>
#include <paths.h>
struct nlist nl[] = {
#define N_GMONPARAM 0
{ "__gmonparam" },
#define N_PROFHZ 1
{ "_profhz" },
0,
};
struct kvmvars {
kvm_t *kd;
struct gmonparam gpm;
};
int Bflag, bflag, hflag, kflag, rflag, pflag;
int debug = 0;
void setprof __P((struct kvmvars *kvp, int state));
void dumpstate __P((struct kvmvars *kvp));
void reset __P((struct kvmvars *kvp));
int
main(int argc, char **argv)
{
extern char *optarg;
extern int optind;
int ch, mode, disp, accessmode;
struct kvmvars kvmvars;
char *system, *kmemf;
seteuid(getuid());
kmemf = NULL;
system = NULL;
while ((ch = getopt(argc, argv, "M:N:Bbhpr")) != EOF) {
switch((char)ch) {
case 'M':
kmemf = optarg;
kflag = 1;
break;
case 'N':
system = optarg;
break;
case 'B':
Bflag = 1;
break;
case 'b':
bflag = 1;
break;
case 'h':
hflag = 1;
break;
case 'p':
pflag = 1;
break;
case 'r':
rflag = 1;
break;
default:
(void)fprintf(stderr,
"usage: kgmon [-Bbhrp] [-M core] [-N system]\n");
exit(1);
}
}
argc -= optind;
argv += optind;
#define BACKWARD_COMPATIBILITY
#ifdef BACKWARD_COMPATIBILITY
if (*argv) {
system = *argv;
if (*++argv) {
kmemf = *argv;
++kflag;
}
}
#endif
if (system == NULL)
system = (char *)getbootfile();
accessmode = openfiles(system, kmemf, &kvmvars);
mode = getprof(&kvmvars);
if (hflag)
disp = GMON_PROF_OFF;
else if (Bflag)
disp = GMON_PROF_HIRES;
else if (bflag)
disp = GMON_PROF_ON;
else
disp = mode;
if (pflag)
dumpstate(&kvmvars);
if (rflag)
reset(&kvmvars);
if (accessmode == O_RDWR)
setprof(&kvmvars, disp);
(void)fprintf(stdout, "kgmon: kernel profiling is %s.\n",
disp == GMON_PROF_OFF ? "off" :
disp == GMON_PROF_HIRES ? "running (high resolution)" :
disp == GMON_PROF_ON ? "running" :
disp == GMON_PROF_BUSY ? "busy" :
disp == GMON_PROF_ERROR ? "off (error)" :
"in an unknown state");
return (0);
}
/*
* Check that profiling is enabled and open any ncessary files.
*/
openfiles(system, kmemf, kvp)
char *system;
char *kmemf;
struct kvmvars *kvp;
{
int mib[3], state, size, openmode;
char errbuf[_POSIX2_LINE_MAX];
if (!kflag) {
mib[0] = CTL_KERN;
mib[1] = KERN_PROF;
mib[2] = GPROF_STATE;
size = sizeof state;
if (sysctl(mib, 3, &state, &size, NULL, 0) < 0) {
(void)fprintf(stderr,
"kgmon: profiling not defined in kernel.\n");
exit(20);
}
if (!(Bflag || bflag || hflag || rflag ||
(pflag &&
(state == GMON_PROF_HIRES || state == GMON_PROF_ON))))
return (O_RDONLY);
(void)seteuid(0);
if (sysctl(mib, 3, NULL, NULL, &state, size) >= 0)
return (O_RDWR);
(void)seteuid(getuid());
kern_readonly(state);
return (O_RDONLY);
}
openmode = (Bflag || bflag || hflag || pflag || rflag)
? O_RDWR : O_RDONLY;
kvp->kd = kvm_openfiles(system, kmemf, NULL, openmode, errbuf);
if (kvp->kd == NULL) {
if (openmode == O_RDWR) {
openmode = O_RDONLY;
kvp->kd = kvm_openfiles(system, kmemf, NULL, O_RDONLY,
errbuf);
}
if (kvp->kd == NULL) {
(void)fprintf(stderr, "kgmon: kvm_openfiles: %s\n",
errbuf);
exit(2);
}
kern_readonly(GMON_PROF_ON);
}
if (kvm_nlist(kvp->kd, nl) < 0) {
(void)fprintf(stderr, "kgmon: %s: no namelist\n", system);
exit(3);
}
if (!nl[N_GMONPARAM].n_value) {
(void)fprintf(stderr,
"kgmon: profiling not defined in kernel.\n");
exit(20);
}
return (openmode);
}
/*
* Suppress options that require a writable kernel.
*/
kern_readonly(mode)
int mode;
{
(void)fprintf(stderr, "kgmon: kernel read-only: ");
if (pflag && (mode == GMON_PROF_HIRES || mode == GMON_PROF_ON))
(void)fprintf(stderr, "data may be inconsistent\n");
if (rflag)
(void)fprintf(stderr, "-r supressed\n");
if (Bflag)
(void)fprintf(stderr, "-B supressed\n");
if (bflag)
(void)fprintf(stderr, "-b supressed\n");
if (hflag)
(void)fprintf(stderr, "-h supressed\n");
rflag = Bflag = bflag = hflag = 0;
}
/*
* Get the state of kernel profiling.
*/
getprof(kvp)
struct kvmvars *kvp;
{
int mib[3], size;
if (kflag) {
size = kvm_read(kvp->kd, nl[N_GMONPARAM].n_value, &kvp->gpm,
sizeof kvp->gpm);
} else {
mib[0] = CTL_KERN;
mib[1] = KERN_PROF;
mib[2] = GPROF_GMONPARAM;
size = sizeof kvp->gpm;
if (sysctl(mib, 3, &kvp->gpm, &size, NULL, 0) < 0)
size = 0;
}
if (size != sizeof kvp->gpm) {
(void)fprintf(stderr, "kgmon: cannot get gmonparam: %s\n",
kflag ? kvm_geterr(kvp->kd) : strerror(errno));
exit (4);
}
return (kvp->gpm.state);
}
/*
* Enable or disable kernel profiling according to the state variable.
*/
void
setprof(kvp, state)
struct kvmvars *kvp;
int state;
{
struct gmonparam *p = (struct gmonparam *)nl[N_GMONPARAM].n_value;
int mib[3], sz, oldstate;
sz = sizeof(state);
if (!kflag) {
mib[0] = CTL_KERN;
mib[1] = KERN_PROF;
mib[2] = GPROF_STATE;
if (sysctl(mib, 3, &oldstate, &sz, NULL, 0) < 0)
goto bad;
if (oldstate == state)
return;
(void)seteuid(0);
if (sysctl(mib, 3, NULL, NULL, &state, sz) >= 0) {
(void)seteuid(getuid());
return;
}
(void)seteuid(getuid());
} else if (kvm_write(kvp->kd, (u_long)&p->state, (void *)&state, sz)
== sz)
return;
bad:
(void)fprintf(stderr, "kgmon: warning: cannot turn profiling %s\n",
state == GMON_PROF_OFF ? "off" : "on");
}
/*
* Build the gmon.out file.
*/
void
dumpstate(kvp)
struct kvmvars *kvp;
{
register FILE *fp;
struct rawarc rawarc;
struct tostruct *tos;
u_long frompc, addr;
u_short *froms, *tickbuf;
int mib[3], i;
struct gmonhdr h;
int fromindex, endfrom, toindex;
setprof(kvp, GMON_PROF_OFF);
fp = fopen("gmon.out", "w");
if (fp == 0) {
perror("gmon.out");
return;
}
/*
* Build the gmon header and write it to a file.
*/
bzero(&h, sizeof(h));
h.lpc = kvp->gpm.lowpc;
h.hpc = kvp->gpm.highpc;
h.ncnt = kvp->gpm.kcountsize + sizeof(h);
h.version = GMONVERSION;
h.profrate = kvp->gpm.profrate;
if (h.profrate == 0)
h.profrate = getprofhz(kvp); /* ancient kernel */
fwrite((char *)&h, sizeof(h), 1, fp);
/*
* Write out the tick buffer.
*/
mib[0] = CTL_KERN;
mib[1] = KERN_PROF;
if ((tickbuf = (u_short *)malloc(kvp->gpm.kcountsize)) == NULL) {
fprintf(stderr, "kgmon: cannot allocate kcount space\n");
exit (5);
}
if (kflag) {
i = kvm_read(kvp->kd, (u_long)kvp->gpm.kcount, (void *)tickbuf,
kvp->gpm.kcountsize);
} else {
mib[2] = GPROF_COUNT;
i = kvp->gpm.kcountsize;
if (sysctl(mib, 3, tickbuf, &i, NULL, 0) < 0)
i = 0;
}
if (i != kvp->gpm.kcountsize) {
(void)fprintf(stderr, "kgmon: read ticks: read %u, got %d: %s",
kvp->gpm.kcountsize, i,
kflag ? kvm_geterr(kvp->kd) : strerror(errno));
exit(6);
}
if ((fwrite(tickbuf, kvp->gpm.kcountsize, 1, fp)) != 1) {
perror("kgmon: writing tocks to gmon.out");
exit(7);
}
free(tickbuf);
/*
* Write out the arc info.
*/
if ((froms = (u_short *)malloc(kvp->gpm.fromssize)) == NULL) {
fprintf(stderr, "kgmon: cannot allocate froms space\n");
exit (8);
}
if (kflag) {
i = kvm_read(kvp->kd, (u_long)kvp->gpm.froms, (void *)froms,
kvp->gpm.fromssize);
} else {
mib[2] = GPROF_FROMS;
i = kvp->gpm.fromssize;
if (sysctl(mib, 3, froms, &i, NULL, 0) < 0)
i = 0;
}
if (i != kvp->gpm.fromssize) {
(void)fprintf(stderr, "kgmon: read froms: read %u, got %d: %s",
kvp->gpm.fromssize, i,
kflag ? kvm_geterr(kvp->kd) : strerror(errno));
exit(9);
}
if ((tos = (struct tostruct *)malloc(kvp->gpm.tossize)) == NULL) {
fprintf(stderr, "kgmon: cannot allocate tos space\n");
exit(10);
}
if (kflag) {
i = kvm_read(kvp->kd, (u_long)kvp->gpm.tos, (void *)tos,
kvp->gpm.tossize);
} else {
mib[2] = GPROF_TOS;
i = kvp->gpm.tossize;
if (sysctl(mib, 3, tos, &i, NULL, 0) < 0)
i = 0;
}
if (i != kvp->gpm.tossize) {
(void)fprintf(stderr, "kgmon: read tos: read %u, got %d: %s",
kvp->gpm.tossize, i,
kflag ? kvm_geterr(kvp->kd) : strerror(errno));
exit(11);
}
if (debug)
(void)fprintf(stderr, "kgmon: lowpc 0x%x, textsize 0x%x\n",
kvp->gpm.lowpc, kvp->gpm.textsize);
endfrom = kvp->gpm.fromssize / sizeof(*froms);
for (fromindex = 0; fromindex < endfrom; ++fromindex) {
if (froms[fromindex] == 0)
continue;
frompc = (u_long)kvp->gpm.lowpc +
(fromindex * kvp->gpm.hashfraction * sizeof(*froms));
for (toindex = froms[fromindex]; toindex != 0;
toindex = tos[toindex].link) {
if (debug)
(void)fprintf(stderr,
"%s: [mcleanup] frompc 0x%x selfpc 0x%x count %d\n",
"kgmon", frompc, tos[toindex].selfpc,
tos[toindex].count);
rawarc.raw_frompc = frompc;
rawarc.raw_selfpc = (u_long)tos[toindex].selfpc;
rawarc.raw_count = tos[toindex].count;
fwrite((char *)&rawarc, sizeof(rawarc), 1, fp);
}
}
fclose(fp);
}
/*
* Get the profiling rate.
*/
int
getprofhz(kvp)
struct kvmvars *kvp;
{
int mib[2], size, profrate;
struct clockinfo clockrate;
if (kflag) {
profrate = 1;
if (kvm_read(kvp->kd, nl[N_PROFHZ].n_value, &profrate,
sizeof profrate) != sizeof profrate)
(void)fprintf(stderr, "kgmon: get clockrate: %s\n",
kvm_geterr(kvp->kd));
return (profrate);
}
mib[0] = CTL_KERN;
mib[1] = KERN_CLOCKRATE;
clockrate.profhz = 1;
size = sizeof clockrate;
if (sysctl(mib, 2, &clockrate, &size, NULL, 0) < 0)
(void)fprintf(stderr, "kgmon: get clockrate: %s\n",
strerror(errno));
return (clockrate.profhz);
}
/*
* Reset the kernel profiling date structures.
*/
void
reset(kvp)
struct kvmvars *kvp;
{
char *zbuf;
u_long biggest;
int mib[3];
setprof(kvp, GMON_PROF_OFF);
biggest = kvp->gpm.kcountsize;
if (kvp->gpm.fromssize > biggest)
biggest = kvp->gpm.fromssize;
if (kvp->gpm.tossize > biggest)
biggest = kvp->gpm.tossize;
if ((zbuf = (char *)malloc(biggest)) == NULL) {
fprintf(stderr, "kgmon: cannot allocate zbuf space\n");
exit(12);
}
bzero(zbuf, biggest);
if (kflag) {
if (kvm_write(kvp->kd, (u_long)kvp->gpm.kcount, zbuf,
kvp->gpm.kcountsize) != kvp->gpm.kcountsize) {
(void)fprintf(stderr, "kgmon: tickbuf zero: %s\n",
kvm_geterr(kvp->kd));
exit(13);
}
if (kvm_write(kvp->kd, (u_long)kvp->gpm.froms, zbuf,
kvp->gpm.fromssize) != kvp->gpm.fromssize) {
(void)fprintf(stderr, "kgmon: froms zero: %s\n",
kvm_geterr(kvp->kd));
exit(14);
}
if (kvm_write(kvp->kd, (u_long)kvp->gpm.tos, zbuf,
kvp->gpm.tossize) != kvp->gpm.tossize) {
(void)fprintf(stderr, "kgmon: tos zero: %s\n",
kvm_geterr(kvp->kd));
exit(15);
}
return;
}
(void)seteuid(0);
mib[0] = CTL_KERN;
mib[1] = KERN_PROF;
mib[2] = GPROF_COUNT;
if (sysctl(mib, 3, NULL, NULL, zbuf, kvp->gpm.kcountsize) < 0) {
(void)fprintf(stderr, "kgmon: tickbuf zero: %s\n",
strerror(errno));
exit(13);
}
mib[2] = GPROF_FROMS;
if (sysctl(mib, 3, NULL, NULL, zbuf, kvp->gpm.fromssize) < 0) {
(void)fprintf(stderr, "kgmon: froms zero: %s\n",
strerror(errno));
exit(14);
}
mib[2] = GPROF_TOS;
if (sysctl(mib, 3, NULL, NULL, zbuf, kvp->gpm.tossize) < 0) {
(void)fprintf(stderr, "kgmon: tos zero: %s\n",
strerror(errno));
exit(15);
}
(void)seteuid(getuid());
free(zbuf);
}
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