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NetBSD/usr.bin/systat/syscall.c

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/* $NetBSD: syscall.c,v 1.2 2006/05/20 20:07:35 dsl Exp $ */
/*-
* Copyright (c) 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by David Laight.
*
* 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. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: syscall.c,v 1.2 2006/05/20 20:07:35 dsl Exp $");
/* System call stats */
#include <sys/param.h>
#include <sys/user.h>
#include <sys/namei.h>
#include <sys/sysctl.h>
#include <sys/device.h>
#include <uvm/uvm_extern.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <util.h>
#include "systat.h"
#include "extern.h"
#include "drvstats.h"
#include "utmpentry.h"
#include "vmstat.h"
#include <sys/syscall.h>
#include <../../sys/kern/syscalls.c>
#define nelem(x) (sizeof (x) / sizeof *(x))
static struct Info {
struct uvmexp_sysctl uvmexp;
struct vmtotal Total;
uint64_t counts[SYS_NSYSENT];
uint64_t times[SYS_NSYSENT];
} s, s1, s2, irf;
int syscall_sort[SYS_NSYSENT];
static enum sort_order { UNSORTED, NAMES, COUNTS } sort_order = NAMES;
#define SHOW_COUNTS 1
#define SHOW_TIMES 2
static int show = SHOW_COUNTS;
static void getinfo(struct Info *, int);
static char buf[26];
static float hertz;
static size_t counts_mib_len, times_mib_len;
static int counts_mib[4], times_mib[4];
WINDOW *
opensyscall(void)
{
return (stdscr);
}
void
closesyscall(WINDOW *w)
{
if (w == NULL)
return;
wclear(w);
wrefresh(w);
}
/*
* These constants define where the major pieces are laid out
*/
#define SYSCALLROW 9 /* Below the vmstat header */
int
initsyscall(void)
{
static char name[] = "name";
hertz = stathz ? stathz : hz;
syscall_order(name);
/* drvinit gets number of cpus! */
drvinit(1);
counts_mib_len = nelem(counts_mib);
if (sysctlnametomib("kern.syscalls.counts", counts_mib, &counts_mib_len))
counts_mib_len = 0;
times_mib_len = nelem(times_mib);
if (sysctlnametomib("kern.syscalls.times", times_mib, &times_mib_len))
times_mib_len = 0;
getinfo(&s2, SHOW_COUNTS | SHOW_TIMES);
s1 = s2;
return(1);
}
void
fetchsyscall(void)
{
time_t now;
time(&now);
strlcpy(buf, ctime(&now), sizeof(buf));
buf[19] = '\0';
getinfo(&s, show);
}
void
labelsyscall(void)
{
labelvmstat_top();
}
#define MAXFAIL 5
static int
compare_counts(const void *a, const void *b)
{
int ia = *(const int *)a, ib = *(const int *)b;
int64_t delta;
if (display_mode == TIME)
delta = irf.counts[ib] - irf.counts[ia];
else
delta = s.counts[ib] - s1.counts[ib]
- (s.counts[ia] - s1.counts[ia]);
return delta ? delta < 0 ? -1 : 1 : 0;
}
static int
compare_times(const void *a, const void *b)
{
int ia = *(const int *)a, ib = *(const int *)b;
int64_t delta;
if (display_mode == TIME)
delta = irf.times[ib] - irf.times[ia];
else
delta = s.times[ib] - s1.times[ib] - s.times[ia] + s1.times[ia];
return delta ? delta < 0 ? -1 : 1 : 0;
}
void
showsyscall(void)
{
int i, ii, l, c;
uint64_t val;
static int failcnt = 0;
static int relabel = 0;
static char pigs[] = "pigs";
if (relabel) {
labelsyscall();
relabel = 0;
}
cpuswap();
if (display_mode == TIME) {
etime = cur.cp_etime;
/* < 5 ticks - ignore this trash */
if ((etime * hertz) < 1.0) {
if (failcnt++ > MAXFAIL)
return;
failcnt = 0;
clear();
mvprintw(2, 10, "The alternate system clock has died!");
mvprintw(3, 10, "Reverting to ``pigs'' display.");
move(CMDLINE, 0);
refresh();
failcnt = 0;
sleep(5);
command(pigs);
return;
}
} else
etime = 1.0;
failcnt = 0;
show_vmstat_top(&s.Total, &s.uvmexp, &s1.uvmexp);
if (sort_order == COUNTS) {
/*
* We use an 'infinite response filter' in a vague
* attempt to stop the data leaping around too much.
* I suspect there are other/better methods in use.
*/
if (show & SHOW_COUNTS) {
for (i = 0; i < nelem(s.counts); i++) {
val = s.counts[i] - s1.counts[i];
if (irf.counts[i] > 0xfffffff)
irf.counts[i] = irf.counts[i] / 8 * 7 + val;
else
irf.counts[i] = irf.counts[i] * 7 / 8 + val;
}
}
if (show & SHOW_TIMES) {
for (i = 0; i < nelem(s.times); i++) {
val = s.times[i] - s1.times[i];
if (irf.times[i] > 0xfffffff)
irf.times[i] = irf.times[i] / 8 * 7 + val;
else
irf.times[i] = irf.times[i] * 7 / 8 + val;
}
}
/* mergesort() doesn't swap equal values about... */
mergesort(syscall_sort, nelem(syscall_sort),
sizeof syscall_sort[0],
show & SHOW_COUNTS ? compare_counts : compare_times);
}
l = SYSCALLROW;
c = 0;
move(l, c);
for (ii = 0; ii < nelem(s.counts); ii++) {
i = syscall_sort[ii];
switch (show) {
default:
case SHOW_COUNTS:
val = s.counts[i] - s1.counts[i];
break;
case SHOW_TIMES:
val = s.times[i] - s1.times[i];
break;
case SHOW_COUNTS | SHOW_TIMES:
val = s.counts[i] - s1.counts[i];
if (val != 0)
val = (s.times[i] - s1.times[i]) / val;
}
if (val == 0 && irf.counts[i] == 0 && irf.times[i] == 0)
continue;
if (i < nelem(syscallnames)) {
const char *name = syscallnames[i];
while (name[0] == '_')
name++;
if (name[0] == 'c' && !strcmp(name + 1, "ompat_"))
name += 7;
mvprintw(l, c, "%17.17s", name);
} else
mvprintw(l, c, "syscall #%d ", i);
putint((unsigned int)((double)val/etime + 0.5), l, c + 17, 9);
c += 27;
if (c + 26 > COLS) {
c = 0;
l++;
if (l >= LINES - 1)
break;
}
}
if (display_mode == TIME) {
memcpy(s1.counts, s.counts, sizeof s1.counts);
memcpy(s1.times, s.times, sizeof s1.times);
}
while (l < LINES - 1) {
clrtoeol();
move(++l, 0);
}
}
void
syscall_boot(char *args)
{
memset(&s1, 0, sizeof s1);
display_mode = BOOT;
}
void
syscall_run(char *args)
{
s1 = s2;
display_mode = RUN;
}
void
syscall_time(char *args)
{
display_mode = TIME;
}
void
syscall_zero(char *args)
{
s1 = s;
}
static int
compare_names(const void *a, const void *b)
{
const char *name_a = syscallnames[*(const int *)a];
const char *name_b = syscallnames[*(const int *)b];
while (*name_a == '_')
name_a++;
while (*name_b == '_')
name_b++;
return strcmp(name_a, name_b);
}
void
syscall_order(char *args)
{
int i, len;
if (args == NULL)
goto usage;
len = strcspn(args, " \t\r\n");
if (args[len + strspn(args + len, " \t\r\n")])
goto usage;
if (memcmp(args, "count", len) == 0) {
sort_order = COUNTS;
memset(&irf, 0, sizeof irf);
} else if (memcmp(args, "name", len) == 0)
sort_order = NAMES;
else if (memcmp(args, "syscall", len) == 0)
sort_order = UNSORTED;
else
goto usage;
/* Undo all the sorting */
for (i = 0; i < nelem(syscall_sort); i++)
syscall_sort[i] = i;
if (sort_order == NAMES) {
/* Only sort the entries we have names for */
qsort(syscall_sort, nelem(syscallnames), sizeof syscall_sort[0],
compare_names);
}
return;
usage:
error("Usage: sort [count|name|syscall]");
}
void
syscall_show(char *args)
{
int len;
if (args == NULL)
goto usage;
len = strcspn(args, " \t\r\n");
if (args[len + strspn(args + len, " \t\r\n")])
goto usage;
if (memcmp(args, "counts", len) == 0)
show = SHOW_COUNTS;
else if (memcmp(args, "times", len) == 0)
show = SHOW_TIMES;
else if (memcmp(args, "ratio", len) == 0)
show = SHOW_COUNTS | SHOW_TIMES;
else
goto usage;
return;
usage:
error("Usage: show [counts|times|ratio]");
}
static void
getinfo(struct Info *stats, int get_what)
{
int mib[2];
size_t size;
cpureadstats();
if (get_what & SHOW_COUNTS) {
size = sizeof stats->counts;
if (!counts_mib_len ||
sysctl(counts_mib, counts_mib_len, &stats->counts, &size,
NULL, 0)) {
error("can't get syscall counts: %s\n", strerror(errno));
memset(&stats->counts, 0, sizeof stats->counts);
}
}
if (get_what & SHOW_TIMES) {
size = sizeof stats->times;
if (!times_mib_len ||
sysctl(times_mib, times_mib_len, &stats->times, &size,
NULL, 0)) {
error("can't get syscall times: %s\n", strerror(errno));
memset(&stats->times, 0, sizeof stats->times);
}
}
size = sizeof(stats->uvmexp);
mib[0] = CTL_VM;
mib[1] = VM_UVMEXP2;
if (sysctl(mib, 2, &stats->uvmexp, &size, NULL, 0) < 0) {
error("can't get uvmexp: %s\n", strerror(errno));
memset(&stats->uvmexp, 0, sizeof(stats->uvmexp));
}
size = sizeof(stats->Total);
mib[0] = CTL_VM;
mib[1] = VM_METER;
if (sysctl(mib, 2, &stats->Total, &size, NULL, 0) < 0) {
error("Can't get kernel info: %s\n", strerror(errno));
memset(&stats->Total, 0, sizeof(stats->Total));
}
}
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