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syscall.c revision 1.7.12.2 
      1 /*	$NetBSD: syscall.c,v 1.7.12.2 2014/08/20 00:05:04 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 1.7.12.2 2014/08/20 00:05:04 tls Exp $");
     34 
     35 /* System call stats */
     36 
     37 #include <sys/param.h>
     38 #include <sys/namei.h>
     39 #include <sys/sysctl.h>
     40 
     41 #include <uvm/uvm_extern.h>
     42 
     43 #include <errno.h>
     44 #include <stdlib.h>
     45 #include <string.h>
     46 #include <util.h>
     47 
     48 #include "systat.h"
     49 #include "extern.h"
     50 #include "drvstats.h"
     51 #include "utmpentry.h"
     52 #include "vmstat.h"
     53 
     54 #include <sys/syscall.h>
     55 #include <../../sys/kern/syscalls.c>
     56 
     57 static struct Info {
     58 	struct	 uvmexp_sysctl uvmexp;
     59 	struct	 vmtotal Total;
     60 	uint64_t counts[SYS_NSYSENT];
     61 	uint64_t times[SYS_NSYSENT];
     62 } s, s1, s2;
     63 
     64 static uint64_t irf[SYS_NSYSENT], val[SYS_NSYSENT];
     65 static int irf_first = 1;
     66 
     67 int syscall_sort[SYS_NSYSENT];
     68 
     69 static	enum sort_order { UNSORTED, NAMES, COUNTS } sort_order = NAMES;
     70 
     71 #define	SHOW_COUNTS	1
     72 #define	SHOW_TIMES	2
     73 static int show = SHOW_COUNTS;
     74 
     75 static void getinfo(struct Info *, int);
     76 
     77 static	char buf[32];
     78 static	float hertz;
     79 
     80 static size_t counts_mib_len, times_mib_len;
     81 static int counts_mib[4], times_mib[4];
     82 
     83 WINDOW *
     84 opensyscall(void)
     85 {
     86 	return (stdscr);
     87 }
     88 
     89 void
     90 closesyscall(WINDOW *w)
     91 {
     92 
     93 	if (w == NULL)
     94 		return;
     95 	wclear(w);
     96 	wrefresh(w);
     97 }
     98 
     99 
    100 /*
    101  * These constants define where the major pieces are laid out
    102  */
    103 #define SYSCALLROW	9	/* Below the vmstat header */
    104 
    105 int
    106 initsyscall(void)
    107 {
    108 	static char name[] = "name";
    109 
    110 	hertz = stathz ? stathz : hz;
    111 
    112 	syscall_order(name);
    113 
    114 	/* drvinit gets number of cpus! */
    115 	drvinit(1);
    116 
    117 	counts_mib_len = __arraycount(counts_mib);
    118 	if (sysctlnametomib("kern.syscalls.counts", counts_mib,
    119 	    &counts_mib_len))
    120 		counts_mib_len = 0;
    121 
    122 	times_mib_len = __arraycount(times_mib);
    123 	if (sysctlnametomib("kern.syscalls.times", times_mib, &times_mib_len))
    124 		times_mib_len = 0;
    125 
    126 	getinfo(&s2, SHOW_COUNTS | SHOW_TIMES);
    127 	s1 = s2;
    128 
    129 	return(1);
    130 }
    131 
    132 void
    133 fetchsyscall(void)
    134 {
    135 	time_t now;
    136 
    137 	time(&now);
    138 	strlcpy(buf, ctime(&now), sizeof(buf));
    139 	buf[19] = '\0';
    140 	getinfo(&s, show);
    141 }
    142 
    143 void
    144 labelsyscall(void)
    145 {
    146 	labelvmstat_top();
    147 }
    148 
    149 #define MAXFAIL 5
    150 
    151 static void
    152 putuint64(uint64_t v, int row, int col, int width)
    153 {
    154 	static const char suffix[] = "KMDT";
    155 	int len, i;
    156 
    157 	len = snprintf(buf, sizeof buf, "%" PRIu64, v);
    158 	if (len > width) {
    159 		i = (len - width) / 3;
    160 		if (i >= (int)sizeof(suffix)) {
    161 			memset(buf, '*', width);
    162 			len = width;
    163 		} else {
    164 			len -= (i + 1) * 3;
    165 			buf[len++] = suffix[i];
    166 		}
    167 		buf[len] = 0;
    168 	}
    169 	mvprintw(row, col, "%*s", width, buf);
    170 }
    171 
    172 static int
    173 compare_irf(const void *a, const void *b)
    174 {
    175 	int ia = *(const int *)a, ib = *(const int *)b;
    176 	int64_t delta;
    177 
    178 	delta = irf[ib] - irf[ia];
    179 	return delta ? delta < 0 ? -1 : 1 : 0;
    180 }
    181 
    182 void
    183 showsyscall(void)
    184 {
    185 	int i, ii, l, c;
    186 	uint64_t v;
    187 	static int failcnt = 0;
    188 	static int relabel = 0;
    189 	static char pigs[] = "pigs";
    190 	uint64_t itime;
    191 
    192 	if (relabel) {
    193 		labelsyscall();
    194 		relabel = 0;
    195 	}
    196 
    197 	cpuswap();
    198 	if (display_mode == TIME) {
    199 		etime = cur.cp_etime;
    200 		/* < 5 ticks - ignore this trash */
    201 		if ((etime * hertz) < 1.0) {
    202 			if (failcnt++ <= MAXFAIL)
    203 				return;
    204 			clear();
    205 			mvprintw(2, 10, "The alternate system clock has died!");
    206 			mvprintw(3, 10, "Reverting to ``pigs'' display.");
    207 			move(CMDLINE, 0);
    208 			refresh();
    209 			failcnt = 0;
    210 			sleep(5);
    211 			command(pigs);
    212 			return;
    213 		}
    214 	} else
    215 		etime = 1.0;
    216 	itime = etime * 100;
    217 
    218 	failcnt = 0;
    219 
    220 	show_vmstat_top(&s.Total, &s.uvmexp, &s1.uvmexp);
    221 
    222 	/* Sort out the values we are going to display */
    223 	for (i = 0; i < (int)__arraycount(s.counts); i++) {
    224 		switch (show) {
    225 		default:
    226 		case SHOW_COUNTS:
    227 			v = s.counts[i] - s1.counts[i];
    228 			break;
    229 		case SHOW_TIMES:
    230 			v = s.times[i] - s1.times[i];
    231 			break;
    232 		case SHOW_COUNTS | SHOW_TIMES:    /* time/count */
    233 			v = s.counts[i] - s1.counts[i];
    234 			v = v ? (s.times[i] - s1.times[i]) / v : 0;
    235 		}
    236 
    237 		if (display_mode == TIME)
    238 		    v = (v * 100 + itime/2) / itime;
    239 
    240 		val[i] = v;
    241 
    242 		/*
    243 		 * We use an 'infinite response filter' in a vague
    244 		 * attempt to stop the data leaping around too much.
    245 		 * I suspect there are other/better methods in use.
    246 		 */
    247 		if (irf_first) {
    248 			irf[i] = v;
    249 			irf_first = 0;
    250 		} else {
    251 			irf[i] = irf[i] * 7 / 8 + v;
    252 		}
    253 	}
    254 
    255 	if (sort_order == COUNTS) {
    256 		/* mergesort() doesn't swap equal values about... */
    257 		mergesort(syscall_sort, __arraycount(syscall_sort),
    258 			sizeof syscall_sort[0], compare_irf);
    259 	}
    260 
    261 	l = SYSCALLROW;
    262 	c = 0;
    263 	move(l, c);
    264 #define FMT "compile kernel with \"options SYSCALL_%s\" to get syscall %s"
    265 	if (counts_mib_len == 0) {
    266 		mvprintw(l, c, FMT, "STATS", "counts");
    267 		l++;
    268 	}
    269 	if (times_mib_len == 0) {
    270 		mvprintw(l, c, FMT, "TIMES", "times");
    271 		l++;
    272 	}
    273 	for (ii = 0; ii < (int)__arraycount(s.counts); ii++) {
    274 		i = syscall_sort[ii];
    275 		if (val[i] == 0 && irf[i] == 0)
    276 			continue;
    277 
    278 		if (i < (int)__arraycount(syscallnames)) {
    279 			const char *name = syscallnames[i];
    280 			while (name[0] == '_')
    281 				name++;
    282 			if (name[0] == 'c' && !strcmp(name + 1, "ompat_"))
    283 				name += 7;
    284 			mvprintw(l, c, "%17.17s", name);
    285 		} else
    286 			mvprintw(l, c, "syscall #%d       ", i);
    287 
    288 		putuint64(val[i], l, c + 18, 8);
    289 		c += 27;
    290 		if (c + 26 > COLS) {
    291 			c = 0;
    292 			l++;
    293 			if (l >= LINES - 1)
    294 				break;
    295 		}
    296 	}
    297 	if (display_mode == TIME) {
    298 		memcpy(s1.counts, s.counts, sizeof s1.counts);
    299 		memcpy(s1.times, s.times, sizeof s1.times);
    300 	}
    301 	while (l < LINES - 1) {
    302 	    clrtoeol();
    303 	    move(++l, 0);
    304 	}
    305 }
    306 
    307 void
    308 syscall_boot(char *args)
    309 {
    310 	memset(&s1, 0, sizeof s1);
    311 	display_mode = BOOT;
    312 }
    313 
    314 void
    315 syscall_run(char *args)
    316 {
    317 	s1 = s2;
    318 	display_mode = RUN;
    319 }
    320 
    321 void
    322 syscall_time(char *args)
    323 {
    324 	display_mode = TIME;
    325 }
    326 
    327 void
    328 syscall_zero(char *args)
    329 {
    330 	s1 = s;
    331 }
    332 
    333 static int
    334 compare_names(const void *a, const void *b)
    335 {
    336 	const char *name_a = syscallnames[*(const int *)a];
    337 	const char *name_b = syscallnames[*(const int *)b];
    338 
    339 	while (*name_a == '_')
    340 		name_a++;
    341 	while (*name_b == '_')
    342 		name_b++;
    343 
    344 	return strcmp(name_a, name_b);
    345 }
    346 
    347 void
    348 syscall_order(char *args)
    349 {
    350 	int i, len;
    351 
    352 	if (args == NULL)
    353 		goto usage;
    354 
    355 	len = strcspn(args, " \t\r\n");
    356 
    357 	if (args[len + strspn(args + len, " \t\r\n")])
    358 		goto usage;
    359 
    360 	if (memcmp(args, "count", len) == 0)
    361 		sort_order = COUNTS;
    362 	else if (memcmp(args, "name", len) == 0)
    363 		sort_order = NAMES;
    364 	else if (memcmp(args, "syscall", len) == 0)
    365 		sort_order = UNSORTED;
    366 	else
    367 		goto usage;
    368 
    369 	/* Undo all the sorting */
    370 	for (i = 0; i < (int)__arraycount(syscall_sort); i++)
    371 		syscall_sort[i] = i;
    372 
    373 	if (sort_order == NAMES) {
    374 		/* Only sort the entries we have names for */
    375 		qsort(syscall_sort, __arraycount(syscallnames), sizeof syscall_sort[0],
    376 			compare_names);
    377 	}
    378 	return;
    379 
    380     usage:
    381 	error("Usage: sort [count|name|syscall]");
    382 }
    383 
    384 void
    385 syscall_show(char *args)
    386 {
    387 	int len;
    388 
    389 	if (args == NULL)
    390 		goto usage;
    391 
    392 	len = strcspn(args, " \t\r\n");
    393 
    394 	if (args[len + strspn(args + len, " \t\r\n")])
    395 		goto usage;
    396 
    397 	if (memcmp(args, "counts", len) == 0)
    398 		show = SHOW_COUNTS;
    399 	else if (memcmp(args, "times", len) == 0)
    400 		show = SHOW_TIMES;
    401 	else if (memcmp(args, "ratio", len) == 0)
    402 		show = SHOW_COUNTS | SHOW_TIMES;
    403 	else
    404 		goto usage;
    405 
    406 	memset(&irf, 0, sizeof irf);
    407 	irf_first = 1;
    408 
    409 	return;
    410 
    411     usage:
    412 	error("Usage: show [counts|times|ratio]");
    413 }
    414 
    415 static void
    416 getinfo(struct Info *stats, int get_what)
    417 {
    418 	int mib[2];
    419 	size_t size;
    420 
    421 	cpureadstats();
    422 
    423 	if (get_what & SHOW_COUNTS) {
    424 		size = sizeof stats->counts;
    425 		if (counts_mib_len != 0) {
    426 			if (sysctl(counts_mib, counts_mib_len, &stats->counts,
    427 			    &size, NULL, 0)) {
    428 				error("can't get syscall counts: %s\n",
    429 				    strerror(errno));
    430 				memset(&stats->counts, 0, sizeof stats->counts);
    431 			}
    432 		}
    433 	}
    434 
    435 	if (get_what & SHOW_TIMES) {
    436 		size = sizeof stats->times;
    437 		if (times_mib_len != 0) {
    438 			if (sysctl(times_mib, times_mib_len, &stats->times,
    439 			    &size, NULL, 0)) {
    440 				error("can't get syscall times: %s\n",
    441 				    strerror(errno));
    442 				memset(&stats->times, 0, sizeof stats->times);
    443 			}
    444 		}
    445 	}
    446 
    447 	size = sizeof(stats->uvmexp);
    448 	mib[0] = CTL_VM;
    449 	mib[1] = VM_UVMEXP2;
    450 	if (sysctl(mib, 2, &stats->uvmexp, &size, NULL, 0) < 0) {
    451 		error("can't get uvmexp: %s\n", strerror(errno));
    452 		memset(&stats->uvmexp, 0, sizeof(stats->uvmexp));
    453 	}
    454 	size = sizeof(stats->Total);
    455 	mib[0] = CTL_VM;
    456 	mib[1] = VM_METER;
    457 	if (sysctl(mib, 2, &stats->Total, &size, NULL, 0) < 0) {
    458 		error("Can't get kernel info: %s\n", strerror(errno));
    459 		memset(&stats->Total, 0, sizeof(stats->Total));
    460 	}
    461 }
    462