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syscall.c revision 1.7.12.1 
      1 /*	$NetBSD: syscall.c,v 1.7.12.1 2013/02/25 00:30:39 tls 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __RCSID("$NetBSD: syscall.c,v 1.7.12.1 2013/02/25 00:30:39 tls Exp $");
     34 
     35 /* System call stats */
     36 
     37 #include <sys/param.h>
     38 #include <sys/user.h>
     39 #include <sys/namei.h>
     40 #include <sys/sysctl.h>
     41 
     42 #include <uvm/uvm_extern.h>
     43 
     44 #include <errno.h>
     45 #include <stdlib.h>
     46 #include <string.h>
     47 #include <util.h>
     48 
     49 #include "systat.h"
     50 #include "extern.h"
     51 #include "drvstats.h"
     52 #include "utmpentry.h"
     53 #include "vmstat.h"
     54 
     55 #include <sys/syscall.h>
     56 #include <../../sys/kern/syscalls.c>
     57 
     58 static struct Info {
     59 	struct	 uvmexp_sysctl uvmexp;
     60 	struct	 vmtotal Total;
     61 	uint64_t counts[SYS_NSYSENT];
     62 	uint64_t times[SYS_NSYSENT];
     63 } s, s1, s2;
     64 
     65 static uint64_t irf[SYS_NSYSENT], val[SYS_NSYSENT];
     66 static int irf_first = 1;
     67 
     68 int syscall_sort[SYS_NSYSENT];
     69 
     70 static	enum sort_order { UNSORTED, NAMES, COUNTS } sort_order = NAMES;
     71 
     72 #define	SHOW_COUNTS	1
     73 #define	SHOW_TIMES	2
     74 static int show = SHOW_COUNTS;
     75 
     76 static void getinfo(struct Info *, int);
     77 
     78 static	char buf[32];
     79 static	float hertz;
     80 
     81 static size_t counts_mib_len, times_mib_len;
     82 static int counts_mib[4], times_mib[4];
     83 
     84 WINDOW *
     85 opensyscall(void)
     86 {
     87 	return (stdscr);
     88 }
     89 
     90 void
     91 closesyscall(WINDOW *w)
     92 {
     93 
     94 	if (w == NULL)
     95 		return;
     96 	wclear(w);
     97 	wrefresh(w);
     98 }
     99 
    100 
    101 /*
    102  * These constants define where the major pieces are laid out
    103  */
    104 #define SYSCALLROW	9	/* Below the vmstat header */
    105 
    106 int
    107 initsyscall(void)
    108 {
    109 	static char name[] = "name";
    110 
    111 	hertz = stathz ? stathz : hz;
    112 
    113 	syscall_order(name);
    114 
    115 	/* drvinit gets number of cpus! */
    116 	drvinit(1);
    117 
    118 	counts_mib_len = __arraycount(counts_mib);
    119 	if (sysctlnametomib("kern.syscalls.counts", counts_mib,
    120 	    &counts_mib_len))
    121 		counts_mib_len = 0;
    122 
    123 	times_mib_len = __arraycount(times_mib);
    124 	if (sysctlnametomib("kern.syscalls.times", times_mib, &times_mib_len))
    125 		times_mib_len = 0;
    126 
    127 	getinfo(&s2, SHOW_COUNTS | SHOW_TIMES);
    128 	s1 = s2;
    129 
    130 	return(1);
    131 }
    132 
    133 void
    134 fetchsyscall(void)
    135 {
    136 	time_t now;
    137 
    138 	time(&now);
    139 	strlcpy(buf, ctime(&now), sizeof(buf));
    140 	buf[19] = '\0';
    141 	getinfo(&s, show);
    142 }
    143 
    144 void
    145 labelsyscall(void)
    146 {
    147 	labelvmstat_top();
    148 }
    149 
    150 #define MAXFAIL 5
    151 
    152 static void
    153 putuint64(uint64_t v, int row, int col, int width)
    154 {
    155 	static const char suffix[] = "KMDT";
    156 	int len, i;
    157 
    158 	len = snprintf(buf, sizeof buf, "%" PRIu64, v);
    159 	if (len > width) {
    160 		i = (len - width) / 3;
    161 		if (i >= (int)sizeof(suffix)) {
    162 			memset(buf, '*', width);
    163 			len = width;
    164 		} else {
    165 			len -= (i + 1) * 3;
    166 			buf[len++] = suffix[i];
    167 		}
    168 		buf[len] = 0;
    169 	}
    170 	mvprintw(row, col, "%*s", width, buf);
    171 }
    172 
    173 static int
    174 compare_irf(const void *a, const void *b)
    175 {
    176 	int ia = *(const int *)a, ib = *(const int *)b;
    177 	int64_t delta;
    178 
    179 	delta = irf[ib] - irf[ia];
    180 	return delta ? delta < 0 ? -1 : 1 : 0;
    181 }
    182 
    183 void
    184 showsyscall(void)
    185 {
    186 	int i, ii, l, c;
    187 	uint64_t v;
    188 	static int failcnt = 0;
    189 	static int relabel = 0;
    190 	static char pigs[] = "pigs";
    191 	uint64_t itime;
    192 
    193 	if (relabel) {
    194 		labelsyscall();
    195 		relabel = 0;
    196 	}
    197 
    198 	cpuswap();
    199 	if (display_mode == TIME) {
    200 		etime = cur.cp_etime;
    201 		/* < 5 ticks - ignore this trash */
    202 		if ((etime * hertz) < 1.0) {
    203 			if (failcnt++ <= MAXFAIL)
    204 				return;
    205 			clear();
    206 			mvprintw(2, 10, "The alternate system clock has died!");
    207 			mvprintw(3, 10, "Reverting to ``pigs'' display.");
    208 			move(CMDLINE, 0);
    209 			refresh();
    210 			failcnt = 0;
    211 			sleep(5);
    212 			command(pigs);
    213 			return;
    214 		}
    215 	} else
    216 		etime = 1.0;
    217 	itime = etime * 100;
    218 
    219 	failcnt = 0;
    220 
    221 	show_vmstat_top(&s.Total, &s.uvmexp, &s1.uvmexp);
    222 
    223 	/* Sort out the values we are going to display */
    224 	for (i = 0; i < (int)__arraycount(s.counts); i++) {
    225 		switch (show) {
    226 		default:
    227 		case SHOW_COUNTS:
    228 			v = s.counts[i] - s1.counts[i];
    229 			break;
    230 		case SHOW_TIMES:
    231 			v = s.times[i] - s1.times[i];
    232 			break;
    233 		case SHOW_COUNTS | SHOW_TIMES:    /* time/count */
    234 			v = s.counts[i] - s1.counts[i];
    235 			v = v ? (s.times[i] - s1.times[i]) / v : 0;
    236 		}
    237 
    238 		if (display_mode == TIME)
    239 		    v = (v * 100 + itime/2) / itime;
    240 
    241 		val[i] = v;
    242 
    243 		/*
    244 		 * We use an 'infinite response filter' in a vague
    245 		 * attempt to stop the data leaping around too much.
    246 		 * I suspect there are other/better methods in use.
    247 		 */
    248 		if (irf_first) {
    249 			irf[i] = v;
    250 			irf_first = 0;
    251 		} else {
    252 			irf[i] = irf[i] * 7 / 8 + v;
    253 		}
    254 	}
    255 
    256 	if (sort_order == COUNTS) {
    257 		/* mergesort() doesn't swap equal values about... */
    258 		mergesort(syscall_sort, __arraycount(syscall_sort),
    259 			sizeof syscall_sort[0], compare_irf);
    260 	}
    261 
    262 	l = SYSCALLROW;
    263 	c = 0;
    264 	move(l, c);
    265 #define FMT "compile kernel with \"options SYSCALL_%s\" to get syscall %s"
    266 	if (counts_mib_len == 0) {
    267 		mvprintw(l, c, FMT, "STATS", "counts");
    268 		l++;
    269 	}
    270 	if (times_mib_len == 0) {
    271 		mvprintw(l, c, FMT, "TIMES", "times");
    272 		l++;
    273 	}
    274 	for (ii = 0; ii < (int)__arraycount(s.counts); ii++) {
    275 		i = syscall_sort[ii];
    276 		if (val[i] == 0 && irf[i] == 0)
    277 			continue;
    278 
    279 		if (i < (int)__arraycount(syscallnames)) {
    280 			const char *name = syscallnames[i];
    281 			while (name[0] == '_')
    282 				name++;
    283 			if (name[0] == 'c' && !strcmp(name + 1, "ompat_"))
    284 				name += 7;
    285 			mvprintw(l, c, "%17.17s", name);
    286 		} else
    287 			mvprintw(l, c, "syscall #%d       ", i);
    288 
    289 		putuint64(val[i], l, c + 18, 8);
    290 		c += 27;
    291 		if (c + 26 > COLS) {
    292 			c = 0;
    293 			l++;
    294 			if (l >= LINES - 1)
    295 				break;
    296 		}
    297 	}
    298 	if (display_mode == TIME) {
    299 		memcpy(s1.counts, s.counts, sizeof s1.counts);
    300 		memcpy(s1.times, s.times, sizeof s1.times);
    301 	}
    302 	while (l < LINES - 1) {
    303 	    clrtoeol();
    304 	    move(++l, 0);
    305 	}
    306 }
    307 
    308 void
    309 syscall_boot(char *args)
    310 {
    311 	memset(&s1, 0, sizeof s1);
    312 	display_mode = BOOT;
    313 }
    314 
    315 void
    316 syscall_run(char *args)
    317 {
    318 	s1 = s2;
    319 	display_mode = RUN;
    320 }
    321 
    322 void
    323 syscall_time(char *args)
    324 {
    325 	display_mode = TIME;
    326 }
    327 
    328 void
    329 syscall_zero(char *args)
    330 {
    331 	s1 = s;
    332 }
    333 
    334 static int
    335 compare_names(const void *a, const void *b)
    336 {
    337 	const char *name_a = syscallnames[*(const int *)a];
    338 	const char *name_b = syscallnames[*(const int *)b];
    339 
    340 	while (*name_a == '_')
    341 		name_a++;
    342 	while (*name_b == '_')
    343 		name_b++;
    344 
    345 	return strcmp(name_a, name_b);
    346 }
    347 
    348 void
    349 syscall_order(char *args)
    350 {
    351 	int i, len;
    352 
    353 	if (args == NULL)
    354 		goto usage;
    355 
    356 	len = strcspn(args, " \t\r\n");
    357 
    358 	if (args[len + strspn(args + len, " \t\r\n")])
    359 		goto usage;
    360 
    361 	if (memcmp(args, "count", len) == 0)
    362 		sort_order = COUNTS;
    363 	else if (memcmp(args, "name", len) == 0)
    364 		sort_order = NAMES;
    365 	else if (memcmp(args, "syscall", len) == 0)
    366 		sort_order = UNSORTED;
    367 	else
    368 		goto usage;
    369 
    370 	/* Undo all the sorting */
    371 	for (i = 0; i < (int)__arraycount(syscall_sort); i++)
    372 		syscall_sort[i] = i;
    373 
    374 	if (sort_order == NAMES) {
    375 		/* Only sort the entries we have names for */
    376 		qsort(syscall_sort, __arraycount(syscallnames), sizeof syscall_sort[0],
    377 			compare_names);
    378 	}
    379 	return;
    380 
    381     usage:
    382 	error("Usage: sort [count|name|syscall]");
    383 }
    384 
    385 void
    386 syscall_show(char *args)
    387 {
    388 	int len;
    389 
    390 	if (args == NULL)
    391 		goto usage;
    392 
    393 	len = strcspn(args, " \t\r\n");
    394 
    395 	if (args[len + strspn(args + len, " \t\r\n")])
    396 		goto usage;
    397 
    398 	if (memcmp(args, "counts", len) == 0)
    399 		show = SHOW_COUNTS;
    400 	else if (memcmp(args, "times", len) == 0)
    401 		show = SHOW_TIMES;
    402 	else if (memcmp(args, "ratio", len) == 0)
    403 		show = SHOW_COUNTS | SHOW_TIMES;
    404 	else
    405 		goto usage;
    406 
    407 	memset(&irf, 0, sizeof irf);
    408 	irf_first = 1;
    409 
    410 	return;
    411 
    412     usage:
    413 	error("Usage: show [counts|times|ratio]");
    414 }
    415 
    416 static void
    417 getinfo(struct Info *stats, int get_what)
    418 {
    419 	int mib[2];
    420 	size_t size;
    421 
    422 	cpureadstats();
    423 
    424 	if (get_what & SHOW_COUNTS) {
    425 		size = sizeof stats->counts;
    426 		if (counts_mib_len != 0) {
    427 			if (sysctl(counts_mib, counts_mib_len, &stats->counts,
    428 			    &size, NULL, 0)) {
    429 				error("can't get syscall counts: %s\n",
    430 				    strerror(errno));
    431 				memset(&stats->counts, 0, sizeof stats->counts);
    432 			}
    433 		}
    434 	}
    435 
    436 	if (get_what & SHOW_TIMES) {
    437 		size = sizeof stats->times;
    438 		if (times_mib_len != 0) {
    439 			if (sysctl(times_mib, times_mib_len, &stats->times,
    440 			    &size, NULL, 0)) {
    441 				error("can't get syscall times: %s\n",
    442 				    strerror(errno));
    443 				memset(&stats->times, 0, sizeof stats->times);
    444 			}
    445 		}
    446 	}
    447 
    448 	size = sizeof(stats->uvmexp);
    449 	mib[0] = CTL_VM;
    450 	mib[1] = VM_UVMEXP2;
    451 	if (sysctl(mib, 2, &stats->uvmexp, &size, NULL, 0) < 0) {
    452 		error("can't get uvmexp: %s\n", strerror(errno));
    453 		memset(&stats->uvmexp, 0, sizeof(stats->uvmexp));
    454 	}
    455 	size = sizeof(stats->Total);
    456 	mib[0] = CTL_VM;
    457 	mib[1] = VM_METER;
    458 	if (sysctl(mib, 2, &stats->Total, &size, NULL, 0) < 0) {
    459 		error("Can't get kernel info: %s\n", strerror(errno));
    460 		memset(&stats->Total, 0, sizeof(stats->Total));
    461 	}
    462 }
    463