Home | History | Annotate | Line # | Download | only in systat
syscall.c revision 1.4 
      1 /*	$NetBSD: syscall.c,v 1.4 2008/02/11 03:51:17 dyoung Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2006 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by David Laight.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of The NetBSD Foundation nor the names of its
     19  *    contributors may be used to endorse or promote products derived
     20  *    from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     25  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     26  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     32  * POSSIBILITY OF SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 __RCSID("$NetBSD: syscall.c,v 1.4 2008/02/11 03:51:17 dyoung Exp $");
     37 
     38 /* System call stats */
     39 
     40 #include <sys/param.h>
     41 #include <sys/user.h>
     42 #include <sys/namei.h>
     43 #include <sys/sysctl.h>
     44 
     45 #include <uvm/uvm_extern.h>
     46 
     47 #include <errno.h>
     48 #include <stdlib.h>
     49 #include <string.h>
     50 #include <util.h>
     51 
     52 #include "systat.h"
     53 #include "extern.h"
     54 #include "drvstats.h"
     55 #include "utmpentry.h"
     56 #include "vmstat.h"
     57 
     58 #include <sys/syscall.h>
     59 #include <../../sys/kern/syscalls.c>
     60 
     61 #define nelem(x) (sizeof (x) / sizeof *(x))
     62 
     63 static struct Info {
     64 	struct	 uvmexp_sysctl uvmexp;
     65 	struct	 vmtotal Total;
     66 	uint64_t counts[SYS_NSYSENT];
     67 	uint64_t times[SYS_NSYSENT];
     68 } s, s1, s2;
     69 
     70 static uint64_t irf[SYS_NSYSENT], val[SYS_NSYSENT];
     71 static int irf_first = 1;
     72 
     73 int syscall_sort[SYS_NSYSENT];
     74 
     75 static	enum sort_order { UNSORTED, NAMES, COUNTS } sort_order = NAMES;
     76 
     77 #define	SHOW_COUNTS	1
     78 #define	SHOW_TIMES	2
     79 static int show = SHOW_COUNTS;
     80 
     81 static void getinfo(struct Info *, int);
     82 
     83 static	char buf[32];
     84 static	float hertz;
     85 
     86 static size_t counts_mib_len, times_mib_len;
     87 static int counts_mib[4], times_mib[4];
     88 
     89 WINDOW *
     90 opensyscall(void)
     91 {
     92 	return (stdscr);
     93 }
     94 
     95 void
     96 closesyscall(WINDOW *w)
     97 {
     98 
     99 	if (w == NULL)
    100 		return;
    101 	wclear(w);
    102 	wrefresh(w);
    103 }
    104 
    105 
    106 /*
    107  * These constants define where the major pieces are laid out
    108  */
    109 #define SYSCALLROW	9	/* Below the vmstat header */
    110 
    111 int
    112 initsyscall(void)
    113 {
    114 	static char name[] = "name";
    115 
    116 	hertz = stathz ? stathz : hz;
    117 
    118 	syscall_order(name);
    119 
    120 	/* drvinit gets number of cpus! */
    121 	drvinit(1);
    122 
    123 	counts_mib_len = nelem(counts_mib);
    124 	if (sysctlnametomib("kern.syscalls.counts", counts_mib, &counts_mib_len))
    125 		counts_mib_len = 0;
    126 
    127 	times_mib_len = nelem(times_mib);
    128 	if (sysctlnametomib("kern.syscalls.times", times_mib, &times_mib_len))
    129 		times_mib_len = 0;
    130 
    131 	getinfo(&s2, SHOW_COUNTS | SHOW_TIMES);
    132 	s1 = s2;
    133 
    134 	return(1);
    135 }
    136 
    137 void
    138 fetchsyscall(void)
    139 {
    140 	time_t now;
    141 
    142 	time(&now);
    143 	strlcpy(buf, ctime(&now), sizeof(buf));
    144 	buf[19] = '\0';
    145 	getinfo(&s, show);
    146 }
    147 
    148 void
    149 labelsyscall(void)
    150 {
    151 	labelvmstat_top();
    152 }
    153 
    154 #define MAXFAIL 5
    155 
    156 static void
    157 putuint64(uint64_t v, int row, int col, int width)
    158 {
    159 	static const char suffix[] = "KMDT";
    160 	int len, i;
    161 
    162 	len = snprintf(buf, sizeof buf, "%" PRIu64, v);
    163 	if (len > width) {
    164 		i = (len - width) / 3;
    165 		if (i >= sizeof suffix) {
    166 			memset(buf, '*', width);
    167 			len = width;
    168 		} else {
    169 			len -= (i + 1) * 3;
    170 			buf[len++] = suffix[i];
    171 		}
    172 		buf[len] = 0;
    173 	}
    174 	mvprintw(row, col, "%*s", width, buf);
    175 }
    176 
    177 static int
    178 compare_irf(const void *a, const void *b)
    179 {
    180 	int ia = *(const int *)a, ib = *(const int *)b;
    181 	int64_t delta;
    182 
    183 	delta = irf[ib] - irf[ia];
    184 	return delta ? delta < 0 ? -1 : 1 : 0;
    185 }
    186 
    187 void
    188 showsyscall(void)
    189 {
    190 	int i, ii, l, c;
    191 	uint64_t v;
    192 	static int failcnt = 0;
    193 	static int relabel = 0;
    194 	static char pigs[] = "pigs";
    195 	uint64_t itime;
    196 
    197 	if (relabel) {
    198 		labelsyscall();
    199 		relabel = 0;
    200 	}
    201 
    202 	cpuswap();
    203 	if (display_mode == TIME) {
    204 		etime = cur.cp_etime;
    205 		/* < 5 ticks - ignore this trash */
    206 		if ((etime * hertz) < 1.0) {
    207 			if (failcnt++ > MAXFAIL)
    208 				return;
    209 			failcnt = 0;
    210 			clear();
    211 			mvprintw(2, 10, "The alternate system clock has died!");
    212 			mvprintw(3, 10, "Reverting to ``pigs'' display.");
    213 			move(CMDLINE, 0);
    214 			refresh();
    215 			failcnt = 0;
    216 			sleep(5);
    217 			command(pigs);
    218 			return;
    219 		}
    220 	} else
    221 		etime = 1.0;
    222 	itime = etime * 100;
    223 
    224 	failcnt = 0;
    225 
    226 	show_vmstat_top(&s.Total, &s.uvmexp, &s1.uvmexp);
    227 
    228 	/* Sort out the values we are going to display */
    229 	for (i = 0; i < nelem(s.counts); i++) {
    230 		switch (show) {
    231 		default:
    232 		case SHOW_COUNTS:
    233 			v = s.counts[i] - s1.counts[i];
    234 			break;
    235 		case SHOW_TIMES:
    236 			v = s.times[i] - s1.times[i];
    237 			break;
    238 		case SHOW_COUNTS | SHOW_TIMES:    /* time/count */
    239 			v = s.counts[i] - s1.counts[i];
    240 			v = v ? (s.times[i] - s1.times[i]) / v : 0;
    241 		}
    242 
    243 		if (display_mode == TIME)
    244 		    v = (v * 100 + itime/2) / itime;
    245 
    246 		val[i] = v;
    247 
    248 		/*
    249 		 * We use an 'infinite response filter' in a vague
    250 		 * attempt to stop the data leaping around too much.
    251 		 * I suspect there are other/better methods in use.
    252 		 */
    253 		if (irf_first) {
    254 			irf[i] = v;
    255 			irf_first = 0;
    256 		} else {
    257 			irf[i] = irf[i] * 7 / 8 + v;
    258 		}
    259 	}
    260 
    261 	if (sort_order == COUNTS) {
    262 		/* mergesort() doesn't swap equal values about... */
    263 		mergesort(syscall_sort, nelem(syscall_sort),
    264 			sizeof syscall_sort[0], compare_irf);
    265 	}
    266 
    267 	l = SYSCALLROW;
    268 	c = 0;
    269 	move(l, c);
    270 	for (ii = 0; ii < nelem(s.counts); ii++) {
    271 		i = syscall_sort[ii];
    272 		if (val[i] == 0 && irf[i] == 0)
    273 			continue;
    274 
    275 		if (i < nelem(syscallnames)) {
    276 			const char *name = syscallnames[i];
    277 			while (name[0] == '_')
    278 				name++;
    279 			if (name[0] == 'c' && !strcmp(name + 1, "ompat_"))
    280 				name += 7;
    281 			mvprintw(l, c, "%17.17s", name);
    282 		} else
    283 			mvprintw(l, c, "syscall #%d       ", i);
    284 
    285 		putuint64(val[i], l, c + 18, 8);
    286 		c += 27;
    287 		if (c + 26 > COLS) {
    288 			c = 0;
    289 			l++;
    290 			if (l >= LINES - 1)
    291 				break;
    292 		}
    293 	}
    294 	if (display_mode == TIME) {
    295 		memcpy(s1.counts, s.counts, sizeof s1.counts);
    296 		memcpy(s1.times, s.times, sizeof s1.times);
    297 	}
    298 	while (l < LINES - 1) {
    299 	    clrtoeol();
    300 	    move(++l, 0);
    301 	}
    302 }
    303 
    304 void
    305 syscall_boot(char *args)
    306 {
    307 	memset(&s1, 0, sizeof s1);
    308 	display_mode = BOOT;
    309 }
    310 
    311 void
    312 syscall_run(char *args)
    313 {
    314 	s1 = s2;
    315 	display_mode = RUN;
    316 }
    317 
    318 void
    319 syscall_time(char *args)
    320 {
    321 	display_mode = TIME;
    322 }
    323 
    324 void
    325 syscall_zero(char *args)
    326 {
    327 	s1 = s;
    328 }
    329 
    330 static int
    331 compare_names(const void *a, const void *b)
    332 {
    333 	const char *name_a = syscallnames[*(const int *)a];
    334 	const char *name_b = syscallnames[*(const int *)b];
    335 
    336 	while (*name_a == '_')
    337 		name_a++;
    338 	while (*name_b == '_')
    339 		name_b++;
    340 
    341 	return strcmp(name_a, name_b);
    342 }
    343 
    344 void
    345 syscall_order(char *args)
    346 {
    347 	int i, len;
    348 
    349 	if (args == NULL)
    350 		goto usage;
    351 
    352 	len = strcspn(args, " \t\r\n");
    353 
    354 	if (args[len + strspn(args + len, " \t\r\n")])
    355 		goto usage;
    356 
    357 	if (memcmp(args, "count", len) == 0)
    358 		sort_order = COUNTS;
    359 	else if (memcmp(args, "name", len) == 0)
    360 		sort_order = NAMES;
    361 	else if (memcmp(args, "syscall", len) == 0)
    362 		sort_order = UNSORTED;
    363 	else
    364 		goto usage;
    365 
    366 	/* Undo all the sorting */
    367 	for (i = 0; i < nelem(syscall_sort); i++)
    368 		syscall_sort[i] = i;
    369 
    370 	if (sort_order == NAMES) {
    371 		/* Only sort the entries we have names for */
    372 		qsort(syscall_sort, nelem(syscallnames), sizeof syscall_sort[0],
    373 			compare_names);
    374 	}
    375 	return;
    376 
    377     usage:
    378 	error("Usage: sort [count|name|syscall]");
    379 }
    380 
    381 void
    382 syscall_show(char *args)
    383 {
    384 	int len;
    385 
    386 	if (args == NULL)
    387 		goto usage;
    388 
    389 	len = strcspn(args, " \t\r\n");
    390 
    391 	if (args[len + strspn(args + len, " \t\r\n")])
    392 		goto usage;
    393 
    394 	if (memcmp(args, "counts", len) == 0)
    395 		show = SHOW_COUNTS;
    396 	else if (memcmp(args, "times", len) == 0)
    397 		show = SHOW_TIMES;
    398 	else if (memcmp(args, "ratio", len) == 0)
    399 		show = SHOW_COUNTS | SHOW_TIMES;
    400 	else
    401 		goto usage;
    402 
    403 	memset(&irf, 0, sizeof irf);
    404 	irf_first = 1;
    405 
    406 	return;
    407 
    408     usage:
    409 	error("Usage: show [counts|times|ratio]");
    410 }
    411 
    412 static void
    413 getinfo(struct Info *stats, int get_what)
    414 {
    415 	int mib[2];
    416 	size_t size;
    417 
    418 	cpureadstats();
    419 
    420 	if (get_what & SHOW_COUNTS) {
    421 		size = sizeof stats->counts;
    422 		if (!counts_mib_len ||
    423 		    sysctl(counts_mib, counts_mib_len, &stats->counts, &size,
    424 			    NULL, 0)) {
    425 			error("can't get syscall counts: %s\n", strerror(errno));
    426 			memset(&stats->counts, 0, sizeof stats->counts);
    427 		}
    428 	}
    429 
    430 	if (get_what & SHOW_TIMES) {
    431 		size = sizeof stats->times;
    432 		if (!times_mib_len ||
    433 		    sysctl(times_mib, times_mib_len, &stats->times, &size,
    434 			    NULL, 0)) {
    435 			error("can't get syscall times: %s\n", strerror(errno));
    436 			memset(&stats->times, 0, sizeof stats->times);
    437 		}
    438 	}
    439 
    440 	size = sizeof(stats->uvmexp);
    441 	mib[0] = CTL_VM;
    442 	mib[1] = VM_UVMEXP2;
    443 	if (sysctl(mib, 2, &stats->uvmexp, &size, NULL, 0) < 0) {
    444 		error("can't get uvmexp: %s\n", strerror(errno));
    445 		memset(&stats->uvmexp, 0, sizeof(stats->uvmexp));
    446 	}
    447 	size = sizeof(stats->Total);
    448 	mib[0] = CTL_VM;
    449 	mib[1] = VM_METER;
    450 	if (sysctl(mib, 2, &stats->Total, &size, NULL, 0) < 0) {
    451 		error("Can't get kernel info: %s\n", strerror(errno));
    452 		memset(&stats->Total, 0, sizeof(stats->Total));
    453 	}
    454 }
    455