2 * Copyright (c) 1997, 1998 Kenneth D. Merry.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/types.h>
33 #include <sys/sysctl.h>
34 #include <sys/errno.h>
35 #include <sys/resource.h>
36 #include <sys/queue.h>
52 compute_stats(struct devstat *current, struct devstat *previous,
53 long double etime, u_int64_t *total_bytes,
54 u_int64_t *total_transfers, u_int64_t *total_blocks,
55 long double *kb_per_transfer, long double *transfers_per_second,
56 long double *mb_per_second, long double *blocks_per_second,
57 long double *ms_per_transaction);
66 char devstat_errbuf[DEVSTAT_ERRBUF_SIZE];
69 * Table to match descriptive strings with device types. These are in
70 * order from most common to least common to speed search time.
72 struct devstat_match_table match_table[] = {
73 {"da", DEVSTAT_TYPE_DIRECT, DEVSTAT_MATCH_TYPE},
74 {"cd", DEVSTAT_TYPE_CDROM, DEVSTAT_MATCH_TYPE},
75 {"scsi", DEVSTAT_TYPE_IF_SCSI, DEVSTAT_MATCH_IF},
76 {"ide", DEVSTAT_TYPE_IF_IDE, DEVSTAT_MATCH_IF},
77 {"other", DEVSTAT_TYPE_IF_OTHER, DEVSTAT_MATCH_IF},
78 {"worm", DEVSTAT_TYPE_WORM, DEVSTAT_MATCH_TYPE},
79 {"sa", DEVSTAT_TYPE_SEQUENTIAL,DEVSTAT_MATCH_TYPE},
80 {"pass", DEVSTAT_TYPE_PASS, DEVSTAT_MATCH_PASS},
81 {"optical", DEVSTAT_TYPE_OPTICAL, DEVSTAT_MATCH_TYPE},
82 {"array", DEVSTAT_TYPE_STORARRAY, DEVSTAT_MATCH_TYPE},
83 {"changer", DEVSTAT_TYPE_CHANGER, DEVSTAT_MATCH_TYPE},
84 {"scanner", DEVSTAT_TYPE_SCANNER, DEVSTAT_MATCH_TYPE},
85 {"printer", DEVSTAT_TYPE_PRINTER, DEVSTAT_MATCH_TYPE},
86 {"floppy", DEVSTAT_TYPE_FLOPPY, DEVSTAT_MATCH_TYPE},
87 {"proc", DEVSTAT_TYPE_PROCESSOR, DEVSTAT_MATCH_TYPE},
88 {"comm", DEVSTAT_TYPE_COMM, DEVSTAT_MATCH_TYPE},
89 {"enclosure", DEVSTAT_TYPE_ENCLOSURE, DEVSTAT_MATCH_TYPE},
94 devstat_metric metric;
95 devstat_arg_type argtype;
96 } devstat_arg_list[] = {
97 { DSM_NONE, DEVSTAT_ARG_NOTYPE },
98 { DSM_TOTAL_BYTES, DEVSTAT_ARG_UINT64 },
99 { DSM_TOTAL_BYTES_READ, DEVSTAT_ARG_UINT64 },
100 { DSM_TOTAL_BYTES_WRITE, DEVSTAT_ARG_UINT64 },
101 { DSM_TOTAL_TRANSFERS, DEVSTAT_ARG_UINT64 },
102 { DSM_TOTAL_TRANSFERS_READ, DEVSTAT_ARG_UINT64 },
103 { DSM_TOTAL_TRANSFERS_WRITE, DEVSTAT_ARG_UINT64 },
104 { DSM_TOTAL_TRANSFERS_OTHER, DEVSTAT_ARG_UINT64 },
105 { DSM_TOTAL_BLOCKS, DEVSTAT_ARG_UINT64 },
106 { DSM_TOTAL_BLOCKS_READ, DEVSTAT_ARG_UINT64 },
107 { DSM_TOTAL_BLOCKS_WRITE, DEVSTAT_ARG_UINT64 },
108 { DSM_KB_PER_TRANSFER, DEVSTAT_ARG_LD },
109 { DSM_KB_PER_TRANSFER_READ, DEVSTAT_ARG_LD },
110 { DSM_KB_PER_TRANSFER_WRITE, DEVSTAT_ARG_LD },
111 { DSM_TRANSFERS_PER_SECOND, DEVSTAT_ARG_LD },
112 { DSM_TRANSFERS_PER_SECOND_READ, DEVSTAT_ARG_LD },
113 { DSM_TRANSFERS_PER_SECOND_WRITE, DEVSTAT_ARG_LD },
114 { DSM_TRANSFERS_PER_SECOND_OTHER, DEVSTAT_ARG_LD },
115 { DSM_MB_PER_SECOND, DEVSTAT_ARG_LD },
116 { DSM_MB_PER_SECOND_READ, DEVSTAT_ARG_LD },
117 { DSM_MB_PER_SECOND_WRITE, DEVSTAT_ARG_LD },
118 { DSM_BLOCKS_PER_SECOND, DEVSTAT_ARG_LD },
119 { DSM_BLOCKS_PER_SECOND_READ, DEVSTAT_ARG_LD },
120 { DSM_BLOCKS_PER_SECOND_WRITE, DEVSTAT_ARG_LD },
121 { DSM_MS_PER_TRANSACTION, DEVSTAT_ARG_LD },
122 { DSM_MS_PER_TRANSACTION_READ, DEVSTAT_ARG_LD },
123 { DSM_MS_PER_TRANSACTION_WRITE, DEVSTAT_ARG_LD },
124 { DSM_SKIP, DEVSTAT_ARG_SKIP },
125 { DSM_TOTAL_BYTES_FREE, DEVSTAT_ARG_UINT64 },
126 { DSM_TOTAL_TRANSFERS_FREE, DEVSTAT_ARG_UINT64 },
127 { DSM_TOTAL_BLOCKS_FREE, DEVSTAT_ARG_UINT64 },
128 { DSM_KB_PER_TRANSFER_FREE, DEVSTAT_ARG_LD },
129 { DSM_MB_PER_SECOND_FREE, DEVSTAT_ARG_LD },
130 { DSM_TRANSFERS_PER_SECOND_FREE, DEVSTAT_ARG_LD },
131 { DSM_BLOCKS_PER_SECOND_FREE, DEVSTAT_ARG_LD },
132 { DSM_MS_PER_TRANSACTION_OTHER, DEVSTAT_ARG_LD },
133 { DSM_MS_PER_TRANSACTION_FREE, DEVSTAT_ARG_LD },
134 { DSM_BUSY_PCT, DEVSTAT_ARG_LD },
135 { DSM_QUEUE_LENGTH, DEVSTAT_ARG_UINT64 },
136 { DSM_TOTAL_DURATION, DEVSTAT_ARG_LD },
137 { DSM_TOTAL_DURATION_READ, DEVSTAT_ARG_LD },
138 { DSM_TOTAL_DURATION_WRITE, DEVSTAT_ARG_LD },
139 { DSM_TOTAL_DURATION_FREE, DEVSTAT_ARG_LD },
140 { DSM_TOTAL_DURATION_OTHER, DEVSTAT_ARG_LD },
141 { DSM_TOTAL_BUSY_TIME, DEVSTAT_ARG_LD },
144 static const char *namelist[] = {
147 #define X_GENERATION 1
148 "_devstat_generation",
151 #define X_DEVICE_STATQ 3
157 * Local function declarations.
159 static int compare_select(const void *arg1, const void *arg2);
160 static int readkmem(kvm_t *kd, unsigned long addr, void *buf, size_t nbytes);
161 static int readkmem_nl(kvm_t *kd, const char *name, void *buf, size_t nbytes);
162 static char *get_devstat_kvm(kvm_t *kd);
164 #define KREADNL(kd, var, val) \
165 readkmem_nl(kd, namelist[var], &val, sizeof(val))
168 devstat_getnumdevs(kvm_t *kd)
173 numdevsize = sizeof(int);
176 * Find out how many devices we have in the system.
179 if (sysctlbyname("kern.devstat.numdevs", &numdevs,
180 &numdevsize, NULL, 0) == -1) {
181 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
182 "%s: error getting number of devices\n"
183 "%s: %s", __func__, __func__,
190 if (KREADNL(kd, X_NUMDEVS, numdevs) == -1)
198 * This is an easy way to get the generation number, but the generation is
199 * supplied in a more atmoic manner by the kern.devstat.all sysctl.
200 * Because this generation sysctl is separate from the statistics sysctl,
201 * the device list and the generation could change between the time that
202 * this function is called and the device list is retreived.
205 devstat_getgeneration(kvm_t *kd)
210 gensize = sizeof(long);
213 * Get the current generation number.
216 if (sysctlbyname("kern.devstat.generation", &generation,
217 &gensize, NULL, 0) == -1) {
218 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
219 "%s: error getting devstat generation\n%s: %s",
220 __func__, __func__, strerror(errno));
225 if (KREADNL(kd, X_GENERATION, generation) == -1)
233 * Get the current devstat version. The return value of this function
234 * should be compared with DEVSTAT_VERSION, which is defined in
235 * sys/devicestat.h. This will enable userland programs to determine
236 * whether they are out of sync with the kernel.
239 devstat_getversion(kvm_t *kd)
244 versize = sizeof(int);
247 * Get the current devstat version.
250 if (sysctlbyname("kern.devstat.version", &version, &versize,
252 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
253 "%s: error getting devstat version\n%s: %s",
254 __func__, __func__, strerror(errno));
259 if (KREADNL(kd, X_VERSION, version) == -1)
267 * Check the devstat version we know about against the devstat version the
268 * kernel knows about. If they don't match, print an error into the
269 * devstat error buffer, and return -1. If they match, return 0.
272 devstat_checkversion(kvm_t *kd)
274 int buflen, res, retval = 0, version;
276 version = devstat_getversion(kd);
278 if (version != DEVSTAT_VERSION) {
280 * If getversion() returns an error (i.e. -1), then it
281 * has printed an error message in the buffer. Therefore,
282 * we need to add a \n to the end of that message before we
283 * print our own message in the buffer.
286 buflen = strlen(devstat_errbuf);
290 res = snprintf(devstat_errbuf + buflen,
291 DEVSTAT_ERRBUF_SIZE - buflen,
292 "%s%s: userland devstat version %d is not "
293 "the same as the kernel\n%s: devstat "
294 "version %d\n", version == -1 ? "\n" : "",
295 __func__, DEVSTAT_VERSION, __func__, version);
298 devstat_errbuf[buflen] = '\0';
300 buflen = strlen(devstat_errbuf);
301 if (version < DEVSTAT_VERSION)
302 res = snprintf(devstat_errbuf + buflen,
303 DEVSTAT_ERRBUF_SIZE - buflen,
304 "%s: libdevstat newer than kernel\n",
307 res = snprintf(devstat_errbuf + buflen,
308 DEVSTAT_ERRBUF_SIZE - buflen,
309 "%s: kernel newer than libdevstat\n",
313 devstat_errbuf[buflen] = '\0';
322 * Get the current list of devices and statistics, and the current
327 * 0 -- device list is unchanged
328 * 1 -- device list has changed
331 devstat_getdevs(kvm_t *kd, struct statinfo *stats)
338 struct devinfo *dinfo;
341 dinfo = stats->dinfo;
344 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
345 "%s: stats->dinfo was NULL", __func__);
349 oldnumdevs = dinfo->numdevs;
350 oldgeneration = dinfo->generation;
352 clock_gettime(CLOCK_MONOTONIC, &ts);
353 stats->snap_time = ts.tv_sec + ts.tv_nsec * 1e-9;
356 /* If this is our first time through, mem_ptr will be null. */
357 if (dinfo->mem_ptr == NULL) {
359 * Get the number of devices. If it's negative, it's an
360 * error. Don't bother setting the error string, since
361 * getnumdevs() has already done that for us.
363 if ((dinfo->numdevs = devstat_getnumdevs(kd)) < 0)
367 * The kern.devstat.all sysctl returns the current
368 * generation number, as well as all the devices.
369 * So we need four bytes more.
371 dssize = (dinfo->numdevs * sizeof(struct devstat)) +
373 dinfo->mem_ptr = (u_int8_t *)malloc(dssize);
374 if (dinfo->mem_ptr == NULL) {
375 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
376 "%s: Cannot allocate memory for mem_ptr element",
381 dssize = (dinfo->numdevs * sizeof(struct devstat)) +
385 * Request all of the devices. We only really allow for one
386 * ENOMEM failure. It would, of course, be possible to just go
387 * in a loop and keep reallocing the device structure until we
388 * don't get ENOMEM back. I'm not sure it's worth it, though.
389 * If devices are being added to the system that quickly, maybe
390 * the user can just wait until all devices are added.
393 error = sysctlbyname("kern.devstat.all",
396 if (error != -1 || errno != EBUSY)
401 * If we get ENOMEM back, that means that there are
402 * more devices now, so we need to allocate more
403 * space for the device array.
405 if (errno == ENOMEM) {
407 * No need to set the error string here,
408 * devstat_getnumdevs() will do that if it fails.
410 if ((dinfo->numdevs = devstat_getnumdevs(kd)) < 0)
413 dssize = (dinfo->numdevs *
414 sizeof(struct devstat)) + sizeof(long);
415 dinfo->mem_ptr = (u_int8_t *)
416 realloc(dinfo->mem_ptr, dssize);
417 if ((error = sysctlbyname("kern.devstat.all",
418 dinfo->mem_ptr, &dssize, NULL, 0)) == -1) {
419 snprintf(devstat_errbuf,
420 sizeof(devstat_errbuf),
421 "%s: error getting device "
422 "stats\n%s: %s", __func__,
423 __func__, strerror(errno));
427 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
428 "%s: error getting device stats\n"
429 "%s: %s", __func__, __func__,
437 * This is of course non-atomic, but since we are working
438 * on a core dump, the generation is unlikely to change
440 if ((dinfo->numdevs = devstat_getnumdevs(kd)) == -1)
442 if ((dinfo->mem_ptr = (u_int8_t *)get_devstat_kvm(kd)) == NULL)
446 * The sysctl spits out the generation as the first four bytes,
447 * then all of the device statistics structures.
449 dinfo->generation = *(long *)dinfo->mem_ptr;
452 * If the generation has changed, and if the current number of
453 * devices is not the same as the number of devices recorded in the
454 * devinfo structure, it is likely that the device list has shrunk.
455 * The reason that it is likely that the device list has shrunk in
456 * this case is that if the device list has grown, the sysctl above
457 * will return an ENOMEM error, and we will reset the number of
458 * devices and reallocate the device array. If the second sysctl
459 * fails, we will return an error and therefore never get to this
460 * point. If the device list has shrunk, the sysctl will not
461 * return an error since we have more space allocated than is
462 * necessary. So, in the shrinkage case, we catch it here and
463 * reallocate the array so that we don't use any more space than is
466 if (oldgeneration != dinfo->generation) {
467 if (devstat_getnumdevs(kd) != dinfo->numdevs) {
468 if ((dinfo->numdevs = devstat_getnumdevs(kd)) < 0)
470 dssize = (dinfo->numdevs * sizeof(struct devstat)) +
472 dinfo->mem_ptr = (u_int8_t *)realloc(dinfo->mem_ptr,
478 dinfo->devices = (struct devstat *)(dinfo->mem_ptr + sizeof(long));
486 * Devices are selected/deselected based upon the following criteria:
487 * - devices specified by the user on the command line
488 * - devices matching any device type expressions given on the command line
489 * - devices with the highest I/O, if 'top' mode is enabled
490 * - the first n unselected devices in the device list, if maxshowdevs
491 * devices haven't already been selected and if the user has not
492 * specified any devices on the command line and if we're in "add" mode.
495 * - device selection list (dev_select)
496 * - current number of devices selected (num_selected)
497 * - total number of devices in the selection list (num_selections)
498 * - devstat generation as of the last time selectdevs() was called
499 * (select_generation)
500 * - current devstat generation (current_generation)
501 * - current list of devices and statistics (devices)
502 * - number of devices in the current device list (numdevs)
503 * - compiled version of the command line device type arguments (matches)
504 * - This is optional. If the number of devices is 0, this will be ignored.
505 * - The matching code pays attention to the current selection mode. So
506 * if you pass in a matching expression, it will be evaluated based
507 * upon the selection mode that is passed in. See below for details.
508 * - number of device type matching expressions (num_matches)
509 * - Set to 0 to disable the matching code.
510 * - list of devices specified on the command line by the user (dev_selections)
511 * - number of devices selected on the command line by the user
512 * (num_dev_selections)
513 * - Our selection mode. There are four different selection modes:
514 * - add mode. (DS_SELECT_ADD) Any devices matching devices explicitly
515 * selected by the user or devices matching a pattern given by the
516 * user will be selected in addition to devices that are already
517 * selected. Additional devices will be selected, up to maxshowdevs
519 * - only mode. (DS_SELECT_ONLY) Only devices matching devices
520 * explicitly given by the user or devices matching a pattern
521 * given by the user will be selected. No other devices will be
523 * - addonly mode. (DS_SELECT_ADDONLY) This is similar to add and
524 * only. Basically, this will not de-select any devices that are
525 * current selected, as only mode would, but it will also not
526 * gratuitously select up to maxshowdevs devices as add mode would.
527 * - remove mode. (DS_SELECT_REMOVE) Any devices matching devices
528 * explicitly selected by the user or devices matching a pattern
529 * given by the user will be de-selected.
530 * - maximum number of devices we can select (maxshowdevs)
531 * - flag indicating whether or not we're in 'top' mode (perf_select)
534 * - the device selection list may be modified and passed back out
535 * - the number of devices selected and the total number of items in the
536 * device selection list may be changed
537 * - the selection generation may be changed to match the current generation
541 * 0 -- selected devices are unchanged
542 * 1 -- selected devices changed
545 devstat_selectdevs(struct device_selection **dev_select, int *num_selected,
546 int *num_selections, long *select_generation,
547 long current_generation, struct devstat *devices,
548 int numdevs, struct devstat_match *matches, int num_matches,
549 char **dev_selections, int num_dev_selections,
550 devstat_select_mode select_mode, int maxshowdevs,
554 int init_selections = 0, init_selected_var = 0;
555 struct device_selection *old_dev_select = NULL;
556 int old_num_selections = 0, old_num_selected;
557 int selection_number = 0;
558 int changed = 0, found = 0;
560 if ((dev_select == NULL) || (devices == NULL) || (numdevs < 0))
564 * We always want to make sure that we have as many dev_select
565 * entries as there are devices.
568 * In this case, we haven't selected devices before.
570 if (*dev_select == NULL) {
571 *dev_select = (struct device_selection *)malloc(numdevs *
572 sizeof(struct device_selection));
573 *select_generation = current_generation;
577 * In this case, we have selected devices before, but the device
578 * list has changed since we last selected devices, so we need to
579 * either enlarge or reduce the size of the device selection list.
581 } else if (*num_selections != numdevs) {
582 *dev_select = (struct device_selection *)reallocf(*dev_select,
583 numdevs * sizeof(struct device_selection));
584 *select_generation = current_generation;
587 * In this case, we've selected devices before, and the selection
588 * list is the same size as it was the last time, but the device
591 } else if (*select_generation < current_generation) {
592 *select_generation = current_generation;
596 if (*dev_select == NULL) {
597 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
598 "%s: Cannot (re)allocate memory for dev_select argument",
604 * If we're in "only" mode, we want to clear out the selected
605 * variable since we're going to select exactly what the user wants
608 if (select_mode == DS_SELECT_ONLY)
609 init_selected_var = 1;
612 * In all cases, we want to back up the number of selected devices.
613 * It is a quick and accurate way to determine whether the selected
614 * devices have changed.
616 old_num_selected = *num_selected;
619 * We want to make a backup of the current selection list if
620 * the list of devices has changed, or if we're in performance
621 * selection mode. In both cases, we don't want to make a backup
622 * if we already know for sure that the list will be different.
623 * This is certainly the case if this is our first time through the
626 if (((init_selected_var != 0) || (init_selections != 0)
627 || (perf_select != 0)) && (changed == 0)){
628 old_dev_select = (struct device_selection *)malloc(
629 *num_selections * sizeof(struct device_selection));
630 if (old_dev_select == NULL) {
631 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
632 "%s: Cannot allocate memory for selection list backup",
636 old_num_selections = *num_selections;
637 bcopy(*dev_select, old_dev_select,
638 sizeof(struct device_selection) * *num_selections);
641 if (init_selections != 0) {
642 bzero(*dev_select, sizeof(struct device_selection) * numdevs);
644 for (i = 0; i < numdevs; i++) {
645 (*dev_select)[i].device_number =
646 devices[i].device_number;
647 strncpy((*dev_select)[i].device_name,
648 devices[i].device_name,
650 (*dev_select)[i].device_name[DEVSTAT_NAME_LEN - 1]='\0';
651 (*dev_select)[i].unit_number = devices[i].unit_number;
652 (*dev_select)[i].position = i;
654 *num_selections = numdevs;
655 } else if (init_selected_var != 0) {
656 for (i = 0; i < numdevs; i++)
657 (*dev_select)[i].selected = 0;
660 /* we haven't gotten around to selecting anything yet.. */
661 if ((select_mode == DS_SELECT_ONLY) || (init_selections != 0)
662 || (init_selected_var != 0))
666 * Look through any devices the user specified on the command line
667 * and see if they match known devices. If so, select them.
669 for (i = 0; (i < *num_selections) && (num_dev_selections > 0); i++) {
672 snprintf(tmpstr, sizeof(tmpstr), "%s%d",
673 (*dev_select)[i].device_name,
674 (*dev_select)[i].unit_number);
675 for (j = 0; j < num_dev_selections; j++) {
676 if (strcmp(tmpstr, dev_selections[j]) == 0) {
678 * Here we do different things based on the
679 * mode we're in. If we're in add or
680 * addonly mode, we only select this device
681 * if it hasn't already been selected.
682 * Otherwise, we would be unnecessarily
683 * changing the selection order and
684 * incrementing the selection count. If
685 * we're in only mode, we unconditionally
686 * select this device, since in only mode
687 * any previous selections are erased and
688 * manually specified devices are the first
689 * ones to be selected. If we're in remove
690 * mode, we de-select the specified device and
691 * decrement the selection count.
693 switch(select_mode) {
695 case DS_SELECT_ADDONLY:
696 if ((*dev_select)[i].selected)
700 (*dev_select)[i].selected =
704 case DS_SELECT_REMOVE:
705 (*dev_select)[i].selected = 0;
708 * This isn't passed back out, we
709 * just use it to keep track of
710 * how many devices we've removed.
712 num_dev_selections--;
721 * Go through the user's device type expressions and select devices
722 * accordingly. We only do this if the number of devices already
723 * selected is less than the maximum number we can show.
725 for (i = 0; (i < num_matches) && (*num_selected < maxshowdevs); i++) {
726 /* We should probably indicate some error here */
727 if ((matches[i].match_fields == DEVSTAT_MATCH_NONE)
728 || (matches[i].num_match_categories <= 0))
731 for (j = 0; j < numdevs; j++) {
732 int num_match_categories;
734 num_match_categories = matches[i].num_match_categories;
737 * Determine whether or not the current device
738 * matches the given matching expression. This if
739 * statement consists of three components:
740 * - the device type check
741 * - the device interface check
742 * - the passthrough check
743 * If a the matching test is successful, it
744 * decrements the number of matching categories,
745 * and if we've reached the last element that
746 * needed to be matched, the if statement succeeds.
749 if ((((matches[i].match_fields & DEVSTAT_MATCH_TYPE)!=0)
750 && ((devices[j].device_type & DEVSTAT_TYPE_MASK) ==
751 (matches[i].device_type & DEVSTAT_TYPE_MASK))
752 &&(((matches[i].match_fields & DEVSTAT_MATCH_PASS)!=0)
753 || (((matches[i].match_fields &
754 DEVSTAT_MATCH_PASS) == 0)
755 && ((devices[j].device_type &
756 DEVSTAT_TYPE_PASS) == 0)))
757 && (--num_match_categories == 0))
758 || (((matches[i].match_fields & DEVSTAT_MATCH_IF) != 0)
759 && ((devices[j].device_type & DEVSTAT_TYPE_IF_MASK) ==
760 (matches[i].device_type & DEVSTAT_TYPE_IF_MASK))
761 &&(((matches[i].match_fields & DEVSTAT_MATCH_PASS)!=0)
762 || (((matches[i].match_fields &
763 DEVSTAT_MATCH_PASS) == 0)
764 && ((devices[j].device_type &
765 DEVSTAT_TYPE_PASS) == 0)))
766 && (--num_match_categories == 0))
767 || (((matches[i].match_fields & DEVSTAT_MATCH_PASS)!=0)
768 && ((devices[j].device_type & DEVSTAT_TYPE_PASS) != 0)
769 && (--num_match_categories == 0))) {
772 * This is probably a non-optimal solution
773 * to the problem that the devices in the
774 * device list will not be in the same
775 * order as the devices in the selection
778 for (k = 0; k < numdevs; k++) {
779 if ((*dev_select)[k].position == j) {
786 * There shouldn't be a case where a device
787 * in the device list is not in the
788 * selection list...but it could happen.
791 fprintf(stderr, "selectdevs: couldn't"
792 " find %s%d in selection "
794 devices[j].device_name,
795 devices[j].unit_number);
800 * We do different things based upon the
801 * mode we're in. If we're in add or only
802 * mode, we go ahead and select this device
803 * if it hasn't already been selected. If
804 * it has already been selected, we leave
805 * it alone so we don't mess up the
806 * selection ordering. Manually specified
807 * devices have already been selected, and
808 * they have higher priority than pattern
809 * matched devices. If we're in remove
810 * mode, we de-select the given device and
811 * decrement the selected count.
813 switch(select_mode) {
815 case DS_SELECT_ADDONLY:
817 if ((*dev_select)[k].selected != 0)
819 (*dev_select)[k].selected =
823 case DS_SELECT_REMOVE:
824 (*dev_select)[k].selected = 0;
833 * Here we implement "top" mode. Devices are sorted in the
834 * selection array based on two criteria: whether or not they are
835 * selected (not selection number, just the fact that they are
836 * selected!) and the number of bytes in the "bytes" field of the
837 * selection structure. The bytes field generally must be kept up
838 * by the user. In the future, it may be maintained by library
839 * functions, but for now the user has to do the work.
841 * At first glance, it may seem wrong that we don't go through and
842 * select every device in the case where the user hasn't specified
843 * any devices or patterns. In fact, though, it won't make any
844 * difference in the device sorting. In that particular case (i.e.
845 * when we're in "add" or "only" mode, and the user hasn't
846 * specified anything) the first time through no devices will be
847 * selected, so the only criterion used to sort them will be their
848 * performance. The second time through, and every time thereafter,
849 * all devices will be selected, so again selection won't matter.
851 if (perf_select != 0) {
853 /* Sort the device array by throughput */
854 qsort(*dev_select, *num_selections,
855 sizeof(struct device_selection),
858 if (*num_selected == 0) {
860 * Here we select every device in the array, if it
861 * isn't already selected. Because the 'selected'
862 * variable in the selection array entries contains
863 * the selection order, the devstats routine can show
864 * the devices that were selected first.
866 for (i = 0; i < *num_selections; i++) {
867 if ((*dev_select)[i].selected == 0) {
868 (*dev_select)[i].selected =
874 selection_number = 0;
875 for (i = 0; i < *num_selections; i++) {
876 if ((*dev_select)[i].selected != 0) {
877 (*dev_select)[i].selected =
885 * If we're in the "add" selection mode and if we haven't already
886 * selected maxshowdevs number of devices, go through the array and
887 * select any unselected devices. If we're in "only" mode, we
888 * obviously don't want to select anything other than what the user
889 * specifies. If we're in "remove" mode, it probably isn't a good
890 * idea to go through and select any more devices, since we might
891 * end up selecting something that the user wants removed. Through
892 * more complicated logic, we could actually figure this out, but
893 * that would probably require combining this loop with the various
894 * selections loops above.
896 if ((select_mode == DS_SELECT_ADD) && (*num_selected < maxshowdevs)) {
897 for (i = 0; i < *num_selections; i++)
898 if ((*dev_select)[i].selected == 0) {
899 (*dev_select)[i].selected = ++selection_number;
905 * Look at the number of devices that have been selected. If it
906 * has changed, set the changed variable. Otherwise, if we've
907 * made a backup of the selection list, compare it to the current
908 * selection list to see if the selected devices have changed.
910 if ((changed == 0) && (old_num_selected != *num_selected))
912 else if ((changed == 0) && (old_dev_select != NULL)) {
914 * Now we go through the selection list and we look at
915 * it three different ways.
917 for (i = 0; (i < *num_selections) && (changed == 0) &&
918 (i < old_num_selections); i++) {
920 * If the device at index i in both the new and old
921 * selection arrays has the same device number and
922 * selection status, it hasn't changed. We
923 * continue on to the next index.
925 if (((*dev_select)[i].device_number ==
926 old_dev_select[i].device_number)
927 && ((*dev_select)[i].selected ==
928 old_dev_select[i].selected))
932 * Now, if we're still going through the if
933 * statement, the above test wasn't true. So we
934 * check here to see if the device at index i in
935 * the current array is the same as the device at
936 * index i in the old array. If it is, that means
937 * that its selection number has changed. Set
938 * changed to 1 and exit the loop.
940 else if ((*dev_select)[i].device_number ==
941 old_dev_select[i].device_number) {
946 * If we get here, then the device at index i in
947 * the current array isn't the same device as the
948 * device at index i in the old array.
954 * Search through the old selection array
955 * looking for a device with the same
956 * device number as the device at index i
957 * in the current array. If the selection
958 * status is the same, then we mark it as
959 * found. If the selection status isn't
960 * the same, we break out of the loop.
961 * Since found isn't set, changed will be
964 for (j = 0; j < old_num_selections; j++) {
965 if (((*dev_select)[i].device_number ==
966 old_dev_select[j].device_number)
967 && ((*dev_select)[i].selected ==
968 old_dev_select[j].selected)){
972 else if ((*dev_select)[i].device_number
973 == old_dev_select[j].device_number)
981 if (old_dev_select != NULL)
982 free(old_dev_select);
988 * Comparison routine for qsort() above. Note that the comparison here is
989 * backwards -- generally, it should return a value to indicate whether
990 * arg1 is <, =, or > arg2. Instead, it returns the opposite. The reason
991 * it returns the opposite is so that the selection array will be sorted in
992 * order of decreasing performance. We sort on two parameters. The first
993 * sort key is whether or not one or the other of the devices in question
994 * has been selected. If one of them has, and the other one has not, the
995 * selected device is automatically more important than the unselected
996 * device. If neither device is selected, we judge the devices based upon
1000 compare_select(const void *arg1, const void *arg2)
1002 if ((((const struct device_selection *)arg1)->selected)
1003 && (((const struct device_selection *)arg2)->selected == 0))
1005 else if ((((const struct device_selection *)arg1)->selected == 0)
1006 && (((const struct device_selection *)arg2)->selected))
1008 else if (((const struct device_selection *)arg2)->bytes <
1009 ((const struct device_selection *)arg1)->bytes)
1011 else if (((const struct device_selection *)arg2)->bytes >
1012 ((const struct device_selection *)arg1)->bytes)
1019 * Take a string with the general format "arg1,arg2,arg3", and build a
1020 * device matching expression from it.
1023 devstat_buildmatch(char *match_str, struct devstat_match **matches,
1031 /* We can't do much without a string to parse */
1032 if (match_str == NULL) {
1033 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1034 "%s: no match expression", __func__);
1039 * Break the (comma delimited) input string out into separate strings.
1041 for (tempstr = tstr, num_args = 0;
1042 (*tempstr = strsep(&match_str, ",")) != NULL && (num_args < 5);)
1043 if (**tempstr != '\0') {
1045 if (++tempstr >= &tstr[5])
1049 /* The user gave us too many type arguments */
1051 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1052 "%s: too many type arguments", __func__);
1056 if (*num_matches == 0)
1059 *matches = (struct devstat_match *)reallocf(*matches,
1060 sizeof(struct devstat_match) * (*num_matches + 1));
1062 if (*matches == NULL) {
1063 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1064 "%s: Cannot allocate memory for matches list", __func__);
1068 /* Make sure the current entry is clear */
1069 bzero(&matches[0][*num_matches], sizeof(struct devstat_match));
1072 * Step through the arguments the user gave us and build a device
1073 * matching expression from them.
1075 for (i = 0; i < num_args; i++) {
1076 char *tempstr2, *tempstr3;
1079 * Get rid of leading white space.
1082 while (isspace(*tempstr2) && (*tempstr2 != '\0'))
1086 * Get rid of trailing white space.
1088 tempstr3 = &tempstr2[strlen(tempstr2) - 1];
1090 while ((*tempstr3 != '\0') && (tempstr3 > tempstr2)
1091 && (isspace(*tempstr3))) {
1097 * Go through the match table comparing the user's
1098 * arguments to known device types, interfaces, etc.
1100 for (j = 0; match_table[j].match_str != NULL; j++) {
1102 * We do case-insensitive matching, in case someone
1103 * wants to enter "SCSI" instead of "scsi" or
1104 * something like that. Only compare as many
1105 * characters as are in the string in the match
1106 * table. This should help if someone tries to use
1107 * a super-long match expression.
1109 if (strncasecmp(tempstr2, match_table[j].match_str,
1110 strlen(match_table[j].match_str)) == 0) {
1112 * Make sure the user hasn't specified two
1113 * items of the same type, like "da" and
1114 * "cd". One device cannot be both.
1116 if (((*matches)[*num_matches].match_fields &
1117 match_table[j].match_field) != 0) {
1118 snprintf(devstat_errbuf,
1119 sizeof(devstat_errbuf),
1120 "%s: cannot have more than "
1121 "one match item in a single "
1122 "category", __func__);
1126 * If we've gotten this far, we have a
1127 * winner. Set the appropriate fields in
1130 (*matches)[*num_matches].match_fields |=
1131 match_table[j].match_field;
1132 (*matches)[*num_matches].device_type |=
1133 match_table[j].type;
1134 (*matches)[*num_matches].num_match_categories++;
1139 * We should have found a match in the above for loop. If
1140 * not, that means the user entered an invalid device type
1143 if ((*matches)[*num_matches].num_match_categories != (i + 1)) {
1144 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1145 "%s: unknown match item \"%s\"", __func__,
1157 * Compute a number of device statistics. Only one field is mandatory, and
1158 * that is "current". Everything else is optional. The caller passes in
1159 * pointers to variables to hold the various statistics he desires. If he
1160 * doesn't want a particular staistic, he should pass in a NULL pointer.
1166 compute_stats(struct devstat *current, struct devstat *previous,
1167 long double etime, u_int64_t *total_bytes,
1168 u_int64_t *total_transfers, u_int64_t *total_blocks,
1169 long double *kb_per_transfer, long double *transfers_per_second,
1170 long double *mb_per_second, long double *blocks_per_second,
1171 long double *ms_per_transaction)
1173 return(devstat_compute_statistics(current, previous, etime,
1174 total_bytes ? DSM_TOTAL_BYTES : DSM_SKIP,
1176 total_transfers ? DSM_TOTAL_TRANSFERS : DSM_SKIP,
1178 total_blocks ? DSM_TOTAL_BLOCKS : DSM_SKIP,
1180 kb_per_transfer ? DSM_KB_PER_TRANSFER : DSM_SKIP,
1182 transfers_per_second ? DSM_TRANSFERS_PER_SECOND : DSM_SKIP,
1183 transfers_per_second,
1184 mb_per_second ? DSM_MB_PER_SECOND : DSM_SKIP,
1186 blocks_per_second ? DSM_BLOCKS_PER_SECOND : DSM_SKIP,
1188 ms_per_transaction ? DSM_MS_PER_TRANSACTION : DSM_SKIP,
1194 /* This is 1/2^64 */
1195 #define BINTIME_SCALE 5.42101086242752217003726400434970855712890625e-20
1198 devstat_compute_etime(struct bintime *cur_time, struct bintime *prev_time)
1202 etime = cur_time->sec;
1203 etime += cur_time->frac * BINTIME_SCALE;
1204 if (prev_time != NULL) {
1205 etime -= prev_time->sec;
1206 etime -= prev_time->frac * BINTIME_SCALE;
1211 #define DELTA(field, index) \
1212 (current->field[(index)] - (previous ? previous->field[(index)] : 0))
1214 #define DELTA_T(field) \
1215 devstat_compute_etime(¤t->field, \
1216 (previous ? &previous->field : NULL))
1219 devstat_compute_statistics(struct devstat *current, struct devstat *previous,
1220 long double etime, ...)
1222 u_int64_t totalbytes, totalbytesread, totalbyteswrite, totalbytesfree;
1223 u_int64_t totaltransfers, totaltransfersread, totaltransferswrite;
1224 u_int64_t totaltransfersother, totalblocks, totalblocksread;
1225 u_int64_t totalblockswrite, totaltransfersfree, totalblocksfree;
1226 long double totalduration, totaldurationread, totaldurationwrite;
1227 long double totaldurationfree, totaldurationother;
1229 devstat_metric metric;
1231 long double *destld;
1237 * current is the only mandatory field.
1239 if (current == NULL) {
1240 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1241 "%s: current stats structure was NULL", __func__);
1245 totalbytesread = DELTA(bytes, DEVSTAT_READ);
1246 totalbyteswrite = DELTA(bytes, DEVSTAT_WRITE);
1247 totalbytesfree = DELTA(bytes, DEVSTAT_FREE);
1248 totalbytes = totalbytesread + totalbyteswrite + totalbytesfree;
1250 totaltransfersread = DELTA(operations, DEVSTAT_READ);
1251 totaltransferswrite = DELTA(operations, DEVSTAT_WRITE);
1252 totaltransfersother = DELTA(operations, DEVSTAT_NO_DATA);
1253 totaltransfersfree = DELTA(operations, DEVSTAT_FREE);
1254 totaltransfers = totaltransfersread + totaltransferswrite +
1255 totaltransfersother + totaltransfersfree;
1257 totalblocks = totalbytes;
1258 totalblocksread = totalbytesread;
1259 totalblockswrite = totalbyteswrite;
1260 totalblocksfree = totalbytesfree;
1262 if (current->block_size > 0) {
1263 totalblocks /= current->block_size;
1264 totalblocksread /= current->block_size;
1265 totalblockswrite /= current->block_size;
1266 totalblocksfree /= current->block_size;
1269 totalblocksread /= 512;
1270 totalblockswrite /= 512;
1271 totalblocksfree /= 512;
1274 totaldurationread = DELTA_T(duration[DEVSTAT_READ]);
1275 totaldurationwrite = DELTA_T(duration[DEVSTAT_WRITE]);
1276 totaldurationfree = DELTA_T(duration[DEVSTAT_FREE]);
1277 totaldurationother = DELTA_T(duration[DEVSTAT_NO_DATA]);
1278 totalduration = totaldurationread + totaldurationwrite +
1279 totaldurationfree + totaldurationother;
1281 va_start(ap, etime);
1283 while ((metric = (devstat_metric)va_arg(ap, devstat_metric)) != 0) {
1285 if (metric == DSM_NONE)
1288 if (metric >= DSM_MAX) {
1289 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1290 "%s: metric %d is out of range", __func__,
1296 switch (devstat_arg_list[metric].argtype) {
1297 case DEVSTAT_ARG_UINT64:
1298 destu64 = (u_int64_t *)va_arg(ap, u_int64_t *);
1300 case DEVSTAT_ARG_LD:
1301 destld = (long double *)va_arg(ap, long double *);
1303 case DEVSTAT_ARG_SKIP:
1304 destld = (long double *)va_arg(ap, long double *);
1309 break; /* NOTREACHED */
1312 if (devstat_arg_list[metric].argtype == DEVSTAT_ARG_SKIP)
1316 case DSM_TOTAL_BYTES:
1317 *destu64 = totalbytes;
1319 case DSM_TOTAL_BYTES_READ:
1320 *destu64 = totalbytesread;
1322 case DSM_TOTAL_BYTES_WRITE:
1323 *destu64 = totalbyteswrite;
1325 case DSM_TOTAL_BYTES_FREE:
1326 *destu64 = totalbytesfree;
1328 case DSM_TOTAL_TRANSFERS:
1329 *destu64 = totaltransfers;
1331 case DSM_TOTAL_TRANSFERS_READ:
1332 *destu64 = totaltransfersread;
1334 case DSM_TOTAL_TRANSFERS_WRITE:
1335 *destu64 = totaltransferswrite;
1337 case DSM_TOTAL_TRANSFERS_FREE:
1338 *destu64 = totaltransfersfree;
1340 case DSM_TOTAL_TRANSFERS_OTHER:
1341 *destu64 = totaltransfersother;
1343 case DSM_TOTAL_BLOCKS:
1344 *destu64 = totalblocks;
1346 case DSM_TOTAL_BLOCKS_READ:
1347 *destu64 = totalblocksread;
1349 case DSM_TOTAL_BLOCKS_WRITE:
1350 *destu64 = totalblockswrite;
1352 case DSM_TOTAL_BLOCKS_FREE:
1353 *destu64 = totalblocksfree;
1355 case DSM_KB_PER_TRANSFER:
1356 *destld = totalbytes;
1358 if (totaltransfers > 0)
1359 *destld /= totaltransfers;
1363 case DSM_KB_PER_TRANSFER_READ:
1364 *destld = totalbytesread;
1366 if (totaltransfersread > 0)
1367 *destld /= totaltransfersread;
1371 case DSM_KB_PER_TRANSFER_WRITE:
1372 *destld = totalbyteswrite;
1374 if (totaltransferswrite > 0)
1375 *destld /= totaltransferswrite;
1379 case DSM_KB_PER_TRANSFER_FREE:
1380 *destld = totalbytesfree;
1382 if (totaltransfersfree > 0)
1383 *destld /= totaltransfersfree;
1387 case DSM_TRANSFERS_PER_SECOND:
1389 *destld = totaltransfers;
1394 case DSM_TRANSFERS_PER_SECOND_READ:
1396 *destld = totaltransfersread;
1401 case DSM_TRANSFERS_PER_SECOND_WRITE:
1403 *destld = totaltransferswrite;
1408 case DSM_TRANSFERS_PER_SECOND_FREE:
1410 *destld = totaltransfersfree;
1415 case DSM_TRANSFERS_PER_SECOND_OTHER:
1417 *destld = totaltransfersother;
1422 case DSM_MB_PER_SECOND:
1423 *destld = totalbytes;
1424 *destld /= 1024 * 1024;
1430 case DSM_MB_PER_SECOND_READ:
1431 *destld = totalbytesread;
1432 *destld /= 1024 * 1024;
1438 case DSM_MB_PER_SECOND_WRITE:
1439 *destld = totalbyteswrite;
1440 *destld /= 1024 * 1024;
1446 case DSM_MB_PER_SECOND_FREE:
1447 *destld = totalbytesfree;
1448 *destld /= 1024 * 1024;
1454 case DSM_BLOCKS_PER_SECOND:
1455 *destld = totalblocks;
1461 case DSM_BLOCKS_PER_SECOND_READ:
1462 *destld = totalblocksread;
1468 case DSM_BLOCKS_PER_SECOND_WRITE:
1469 *destld = totalblockswrite;
1475 case DSM_BLOCKS_PER_SECOND_FREE:
1476 *destld = totalblocksfree;
1483 * Some devstat callers update the duration and some don't.
1484 * So this will only be accurate if they provide the
1487 case DSM_MS_PER_TRANSACTION:
1488 if (totaltransfers > 0) {
1489 *destld = totalduration;
1490 *destld /= totaltransfers;
1495 case DSM_MS_PER_TRANSACTION_READ:
1496 if (totaltransfersread > 0) {
1497 *destld = totaldurationread;
1498 *destld /= totaltransfersread;
1503 case DSM_MS_PER_TRANSACTION_WRITE:
1504 if (totaltransferswrite > 0) {
1505 *destld = totaldurationwrite;
1506 *destld /= totaltransferswrite;
1511 case DSM_MS_PER_TRANSACTION_FREE:
1512 if (totaltransfersfree > 0) {
1513 *destld = totaldurationfree;
1514 *destld /= totaltransfersfree;
1519 case DSM_MS_PER_TRANSACTION_OTHER:
1520 if (totaltransfersother > 0) {
1521 *destld = totaldurationother;
1522 *destld /= totaltransfersother;
1528 *destld = DELTA_T(busy_time);
1536 case DSM_QUEUE_LENGTH:
1537 *destu64 = current->start_count - current->end_count;
1539 case DSM_TOTAL_DURATION:
1540 *destld = totalduration;
1542 case DSM_TOTAL_DURATION_READ:
1543 *destld = totaldurationread;
1545 case DSM_TOTAL_DURATION_WRITE:
1546 *destld = totaldurationwrite;
1548 case DSM_TOTAL_DURATION_FREE:
1549 *destld = totaldurationfree;
1551 case DSM_TOTAL_DURATION_OTHER:
1552 *destld = totaldurationother;
1554 case DSM_TOTAL_BUSY_TIME:
1555 *destld = DELTA_T(busy_time);
1558 * XXX: comment out the default block to see if any case's are missing.
1563 * This shouldn't happen, since we should have
1564 * caught any out of range metrics at the top of
1567 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1568 "%s: unknown metric %d", __func__, metric);
1571 break; /* NOTREACHED */
1583 readkmem(kvm_t *kd, unsigned long addr, void *buf, size_t nbytes)
1586 if (kvm_read(kd, addr, buf, nbytes) == -1) {
1587 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1588 "%s: error reading value (kvm_read): %s", __func__,
1596 readkmem_nl(kvm_t *kd, const char *name, void *buf, size_t nbytes)
1600 nl[0].n_name = (char *)name;
1601 nl[1].n_name = NULL;
1603 if (kvm_nlist(kd, nl) == -1) {
1604 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1605 "%s: error getting name list (kvm_nlist): %s",
1606 __func__, kvm_geterr(kd));
1609 return(readkmem(kd, nl[0].n_value, buf, nbytes));
1613 * This duplicates the functionality of the kernel sysctl handler for poking
1614 * through crash dumps.
1617 get_devstat_kvm(kvm_t *kd)
1621 struct devstat *nds;
1623 struct devstatlist dhead;
1627 if ((num_devs = devstat_getnumdevs(kd)) <= 0)
1629 if (KREADNL(kd, X_DEVICE_STATQ, dhead) == -1)
1632 nds = STAILQ_FIRST(&dhead);
1634 if ((rv = malloc(sizeof(gen))) == NULL) {
1635 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1636 "%s: out of memory (initial malloc failed)",
1640 gen = devstat_getgeneration(kd);
1641 memcpy(rv, &gen, sizeof(gen));
1644 * Now push out all the devices.
1646 for (i = 0; (nds != NULL) && (i < num_devs);
1647 nds = STAILQ_NEXT(nds, dev_links), i++) {
1648 if (readkmem(kd, (long)nds, &ds, sizeof(ds)) == -1) {
1653 rv = (char *)reallocf(rv, sizeof(gen) +
1654 sizeof(ds) * (i + 1));
1656 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1657 "%s: out of memory (malloc failed)",
1661 memcpy(rv + wp, &ds, sizeof(ds));