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Fix a bug under time's "-l" option. The values reported for average

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shared memory size, average unshared data size, and average unshared
stack size were too high by a factor of 128/100, because the program
used a hard-coded hz value of 100.  The correct value is the frequency
of the statistics clock, currently 128.  The program now uses sysctl
to get the stathz value from the kernel.

Discussed with:	bde@freebsd.org (Bruce Evans)
This commit is contained in:
John Polstra 1996-07-30 19:00:12 +00:00
parent edd84a267a
commit f0850246bb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=17351
1 changed files with 24 additions and 1 deletions
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25
usr.bin/time/time.c
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@ -45,8 +45,13 @@ static char sccsid[] = "@(#)time.c 8.1 (Berkeley) 6/6/93";
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/signal.h>
#include <sys/sysctl.h>
#include <err.h>
#include <stdio.h>
static int getstathz __P((void));
main(argc, argv)
int argc;
char **argv;
@ -102,7 +107,7 @@ main(argc, argv)
fprintf(stderr, "%9ld.%02ld sys\n",
ru.ru_stime.tv_sec, ru.ru_stime.tv_usec/10000);
if (lflag) {
int hz = 100; /* XXX */
int hz = getstathz();
u_long ticks;
ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) +
@ -146,3 +151,21 @@ main(argc, argv)
}
exit (status>>8);
}
/*
* Return the frequency of the kernel's statistics clock.
*/
static int
getstathz()
{
struct clockinfo clockrate;
int mib[2];
size_t size;
mib[0] = CTL_KERN;
mib[1] = KERN_CLOCKRATE;
size = sizeof clockrate;
if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1)
err(1, "sysctl kern.clockrate");
return clockrate.stathz;
}