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
153 #define X_TIME_UPTIME 4
159 * Local function declarations.
161 static int compare_select(const void *arg1, const void *arg2);
162 static int readkmem(kvm_t *kd, unsigned long addr, void *buf, size_t nbytes);
163 static int readkmem_nl(kvm_t *kd, const char *name, void *buf, size_t nbytes);
164 static char *get_devstat_kvm(kvm_t *kd);
166 #define KREADNL(kd, var, val) \
167 readkmem_nl(kd, namelist[var], &val, sizeof(val))
170 devstat_getnumdevs(kvm_t *kd)
175 numdevsize = sizeof(int);
178 * Find out how many devices we have in the system.
181 if (sysctlbyname("kern.devstat.numdevs", &numdevs,
182 &numdevsize, NULL, 0) == -1) {
183 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
184 "%s: error getting number of devices\n"
185 "%s: %s", __func__, __func__,
192 if (KREADNL(kd, X_NUMDEVS, numdevs) == -1)
200 * This is an easy way to get the generation number, but the generation is
201 * supplied in a more atmoic manner by the kern.devstat.all sysctl.
202 * Because this generation sysctl is separate from the statistics sysctl,
203 * the device list and the generation could change between the time that
204 * this function is called and the device list is retrieved.
207 devstat_getgeneration(kvm_t *kd)
212 gensize = sizeof(long);
215 * Get the current generation number.
218 if (sysctlbyname("kern.devstat.generation", &generation,
219 &gensize, NULL, 0) == -1) {
220 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
221 "%s: error getting devstat generation\n%s: %s",
222 __func__, __func__, strerror(errno));
227 if (KREADNL(kd, X_GENERATION, generation) == -1)
235 * Get the current devstat version. The return value of this function
236 * should be compared with DEVSTAT_VERSION, which is defined in
237 * sys/devicestat.h. This will enable userland programs to determine
238 * whether they are out of sync with the kernel.
241 devstat_getversion(kvm_t *kd)
246 versize = sizeof(int);
249 * Get the current devstat version.
252 if (sysctlbyname("kern.devstat.version", &version, &versize,
254 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
255 "%s: error getting devstat version\n%s: %s",
256 __func__, __func__, strerror(errno));
261 if (KREADNL(kd, X_VERSION, version) == -1)
269 * Check the devstat version we know about against the devstat version the
270 * kernel knows about. If they don't match, print an error into the
271 * devstat error buffer, and return -1. If they match, return 0.
274 devstat_checkversion(kvm_t *kd)
276 int buflen, res, retval = 0, version;
278 version = devstat_getversion(kd);
280 if (version != DEVSTAT_VERSION) {
282 * If getversion() returns an error (i.e. -1), then it
283 * has printed an error message in the buffer. Therefore,
284 * we need to add a \n to the end of that message before we
285 * print our own message in the buffer.
288 buflen = strlen(devstat_errbuf);
292 res = snprintf(devstat_errbuf + buflen,
293 DEVSTAT_ERRBUF_SIZE - buflen,
294 "%s%s: userland devstat version %d is not "
295 "the same as the kernel\n%s: devstat "
296 "version %d\n", version == -1 ? "\n" : "",
297 __func__, DEVSTAT_VERSION, __func__, version);
300 devstat_errbuf[buflen] = '\0';
302 buflen = strlen(devstat_errbuf);
303 if (version < DEVSTAT_VERSION)
304 res = snprintf(devstat_errbuf + buflen,
305 DEVSTAT_ERRBUF_SIZE - buflen,
306 "%s: libdevstat newer than kernel\n",
309 res = snprintf(devstat_errbuf + buflen,
310 DEVSTAT_ERRBUF_SIZE - buflen,
311 "%s: kernel newer than libdevstat\n",
315 devstat_errbuf[buflen] = '\0';
324 * Get the current list of devices and statistics, and the current
329 * 0 -- device list is unchanged
330 * 1 -- device list has changed
333 devstat_getdevs(kvm_t *kd, struct statinfo *stats)
339 struct devinfo *dinfo;
342 dinfo = stats->dinfo;
345 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
346 "%s: stats->dinfo was NULL", __func__);
350 oldgeneration = dinfo->generation;
353 clock_gettime(CLOCK_MONOTONIC, &ts);
354 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__,
436 if (KREADNL(kd, X_TIME_UPTIME, ts.tv_sec) == -1)
439 stats->snap_time = ts.tv_sec;
442 * This is of course non-atomic, but since we are working
443 * on a core dump, the generation is unlikely to change
445 if ((dinfo->numdevs = devstat_getnumdevs(kd)) == -1)
447 if ((dinfo->mem_ptr = (u_int8_t *)get_devstat_kvm(kd)) == NULL)
451 * The sysctl spits out the generation as the first four bytes,
452 * then all of the device statistics structures.
454 dinfo->generation = *(long *)dinfo->mem_ptr;
457 * If the generation has changed, and if the current number of
458 * devices is not the same as the number of devices recorded in the
459 * devinfo structure, it is likely that the device list has shrunk.
460 * The reason that it is likely that the device list has shrunk in
461 * this case is that if the device list has grown, the sysctl above
462 * will return an ENOMEM error, and we will reset the number of
463 * devices and reallocate the device array. If the second sysctl
464 * fails, we will return an error and therefore never get to this
465 * point. If the device list has shrunk, the sysctl will not
466 * return an error since we have more space allocated than is
467 * necessary. So, in the shrinkage case, we catch it here and
468 * reallocate the array so that we don't use any more space than is
471 if (oldgeneration != dinfo->generation) {
472 if (devstat_getnumdevs(kd) != dinfo->numdevs) {
473 if ((dinfo->numdevs = devstat_getnumdevs(kd)) < 0)
475 dssize = (dinfo->numdevs * sizeof(struct devstat)) +
477 dinfo->mem_ptr = (u_int8_t *)realloc(dinfo->mem_ptr,
483 dinfo->devices = (struct devstat *)(dinfo->mem_ptr + sizeof(long));
491 * Devices are selected/deselected based upon the following criteria:
492 * - devices specified by the user on the command line
493 * - devices matching any device type expressions given on the command line
494 * - devices with the highest I/O, if 'top' mode is enabled
495 * - the first n unselected devices in the device list, if maxshowdevs
496 * devices haven't already been selected and if the user has not
497 * specified any devices on the command line and if we're in "add" mode.
500 * - device selection list (dev_select)
501 * - current number of devices selected (num_selected)
502 * - total number of devices in the selection list (num_selections)
503 * - devstat generation as of the last time selectdevs() was called
504 * (select_generation)
505 * - current devstat generation (current_generation)
506 * - current list of devices and statistics (devices)
507 * - number of devices in the current device list (numdevs)
508 * - compiled version of the command line device type arguments (matches)
509 * - This is optional. If the number of devices is 0, this will be ignored.
510 * - The matching code pays attention to the current selection mode. So
511 * if you pass in a matching expression, it will be evaluated based
512 * upon the selection mode that is passed in. See below for details.
513 * - number of device type matching expressions (num_matches)
514 * - Set to 0 to disable the matching code.
515 * - list of devices specified on the command line by the user (dev_selections)
516 * - number of devices selected on the command line by the user
517 * (num_dev_selections)
518 * - Our selection mode. There are four different selection modes:
519 * - add mode. (DS_SELECT_ADD) Any devices matching devices explicitly
520 * selected by the user or devices matching a pattern given by the
521 * user will be selected in addition to devices that are already
522 * selected. Additional devices will be selected, up to maxshowdevs
524 * - only mode. (DS_SELECT_ONLY) Only devices matching devices
525 * explicitly given by the user or devices matching a pattern
526 * given by the user will be selected. No other devices will be
528 * - addonly mode. (DS_SELECT_ADDONLY) This is similar to add and
529 * only. Basically, this will not de-select any devices that are
530 * current selected, as only mode would, but it will also not
531 * gratuitously select up to maxshowdevs devices as add mode would.
532 * - remove mode. (DS_SELECT_REMOVE) Any devices matching devices
533 * explicitly selected by the user or devices matching a pattern
534 * given by the user will be de-selected.
535 * - maximum number of devices we can select (maxshowdevs)
536 * - flag indicating whether or not we're in 'top' mode (perf_select)
539 * - the device selection list may be modified and passed back out
540 * - the number of devices selected and the total number of items in the
541 * device selection list may be changed
542 * - the selection generation may be changed to match the current generation
546 * 0 -- selected devices are unchanged
547 * 1 -- selected devices changed
550 devstat_selectdevs(struct device_selection **dev_select, int *num_selected,
551 int *num_selections, long *select_generation,
552 long current_generation, struct devstat *devices,
553 int numdevs, struct devstat_match *matches, int num_matches,
554 char **dev_selections, int num_dev_selections,
555 devstat_select_mode select_mode, int maxshowdevs,
559 int init_selections = 0, init_selected_var = 0;
560 struct device_selection *old_dev_select = NULL;
561 int old_num_selections = 0, old_num_selected;
562 int selection_number = 0;
563 int changed = 0, found = 0;
565 if ((dev_select == NULL) || (devices == NULL) || (numdevs < 0))
569 * We always want to make sure that we have as many dev_select
570 * entries as there are devices.
573 * In this case, we haven't selected devices before.
575 if (*dev_select == NULL) {
576 *dev_select = (struct device_selection *)malloc(numdevs *
577 sizeof(struct device_selection));
578 *select_generation = current_generation;
582 * In this case, we have selected devices before, but the device
583 * list has changed since we last selected devices, so we need to
584 * either enlarge or reduce the size of the device selection list.
586 } else if (*num_selections != numdevs) {
587 *dev_select = (struct device_selection *)reallocf(*dev_select,
588 numdevs * sizeof(struct device_selection));
589 *select_generation = current_generation;
592 * In this case, we've selected devices before, and the selection
593 * list is the same size as it was the last time, but the device
596 } else if (*select_generation < current_generation) {
597 *select_generation = current_generation;
601 if (*dev_select == NULL) {
602 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
603 "%s: Cannot (re)allocate memory for dev_select argument",
609 * If we're in "only" mode, we want to clear out the selected
610 * variable since we're going to select exactly what the user wants
613 if (select_mode == DS_SELECT_ONLY)
614 init_selected_var = 1;
617 * In all cases, we want to back up the number of selected devices.
618 * It is a quick and accurate way to determine whether the selected
619 * devices have changed.
621 old_num_selected = *num_selected;
624 * We want to make a backup of the current selection list if
625 * the list of devices has changed, or if we're in performance
626 * selection mode. In both cases, we don't want to make a backup
627 * if we already know for sure that the list will be different.
628 * This is certainly the case if this is our first time through the
631 if (((init_selected_var != 0) || (init_selections != 0)
632 || (perf_select != 0)) && (changed == 0)){
633 old_dev_select = (struct device_selection *)malloc(
634 *num_selections * sizeof(struct device_selection));
635 if (old_dev_select == NULL) {
636 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
637 "%s: Cannot allocate memory for selection list backup",
641 old_num_selections = *num_selections;
642 bcopy(*dev_select, old_dev_select,
643 sizeof(struct device_selection) * *num_selections);
646 if (init_selections != 0) {
647 bzero(*dev_select, sizeof(struct device_selection) * numdevs);
649 for (i = 0; i < numdevs; i++) {
650 (*dev_select)[i].device_number =
651 devices[i].device_number;
652 strncpy((*dev_select)[i].device_name,
653 devices[i].device_name,
655 (*dev_select)[i].device_name[DEVSTAT_NAME_LEN - 1]='\0';
656 (*dev_select)[i].unit_number = devices[i].unit_number;
657 (*dev_select)[i].position = i;
659 *num_selections = numdevs;
660 } else if (init_selected_var != 0) {
661 for (i = 0; i < numdevs; i++)
662 (*dev_select)[i].selected = 0;
665 /* we haven't gotten around to selecting anything yet.. */
666 if ((select_mode == DS_SELECT_ONLY) || (init_selections != 0)
667 || (init_selected_var != 0))
671 * Look through any devices the user specified on the command line
672 * and see if they match known devices. If so, select them.
674 for (i = 0; (i < *num_selections) && (num_dev_selections > 0); i++) {
677 snprintf(tmpstr, sizeof(tmpstr), "%s%d",
678 (*dev_select)[i].device_name,
679 (*dev_select)[i].unit_number);
680 for (j = 0; j < num_dev_selections; j++) {
681 if (strcmp(tmpstr, dev_selections[j]) == 0) {
683 * Here we do different things based on the
684 * mode we're in. If we're in add or
685 * addonly mode, we only select this device
686 * if it hasn't already been selected.
687 * Otherwise, we would be unnecessarily
688 * changing the selection order and
689 * incrementing the selection count. If
690 * we're in only mode, we unconditionally
691 * select this device, since in only mode
692 * any previous selections are erased and
693 * manually specified devices are the first
694 * ones to be selected. If we're in remove
695 * mode, we de-select the specified device and
696 * decrement the selection count.
698 switch(select_mode) {
700 case DS_SELECT_ADDONLY:
701 if ((*dev_select)[i].selected)
705 (*dev_select)[i].selected =
709 case DS_SELECT_REMOVE:
710 (*dev_select)[i].selected = 0;
713 * This isn't passed back out, we
714 * just use it to keep track of
715 * how many devices we've removed.
717 num_dev_selections--;
726 * Go through the user's device type expressions and select devices
727 * accordingly. We only do this if the number of devices already
728 * selected is less than the maximum number we can show.
730 for (i = 0; (i < num_matches) && (*num_selected < maxshowdevs); i++) {
731 /* We should probably indicate some error here */
732 if ((matches[i].match_fields == DEVSTAT_MATCH_NONE)
733 || (matches[i].num_match_categories <= 0))
736 for (j = 0; j < numdevs; j++) {
737 int num_match_categories;
739 num_match_categories = matches[i].num_match_categories;
742 * Determine whether or not the current device
743 * matches the given matching expression. This if
744 * statement consists of three components:
745 * - the device type check
746 * - the device interface check
747 * - the passthrough check
748 * If a the matching test is successful, it
749 * decrements the number of matching categories,
750 * and if we've reached the last element that
751 * needed to be matched, the if statement succeeds.
754 if ((((matches[i].match_fields & DEVSTAT_MATCH_TYPE)!=0)
755 && ((devices[j].device_type & DEVSTAT_TYPE_MASK) ==
756 (matches[i].device_type & DEVSTAT_TYPE_MASK))
757 &&(((matches[i].match_fields & DEVSTAT_MATCH_PASS)!=0)
758 || (((matches[i].match_fields &
759 DEVSTAT_MATCH_PASS) == 0)
760 && ((devices[j].device_type &
761 DEVSTAT_TYPE_PASS) == 0)))
762 && (--num_match_categories == 0))
763 || (((matches[i].match_fields & DEVSTAT_MATCH_IF) != 0)
764 && ((devices[j].device_type & DEVSTAT_TYPE_IF_MASK) ==
765 (matches[i].device_type & DEVSTAT_TYPE_IF_MASK))
766 &&(((matches[i].match_fields & DEVSTAT_MATCH_PASS)!=0)
767 || (((matches[i].match_fields &
768 DEVSTAT_MATCH_PASS) == 0)
769 && ((devices[j].device_type &
770 DEVSTAT_TYPE_PASS) == 0)))
771 && (--num_match_categories == 0))
772 || (((matches[i].match_fields & DEVSTAT_MATCH_PASS)!=0)
773 && ((devices[j].device_type & DEVSTAT_TYPE_PASS) != 0)
774 && (--num_match_categories == 0))) {
777 * This is probably a non-optimal solution
778 * to the problem that the devices in the
779 * device list will not be in the same
780 * order as the devices in the selection
783 for (k = 0; k < numdevs; k++) {
784 if ((*dev_select)[k].position == j) {
791 * There shouldn't be a case where a device
792 * in the device list is not in the
793 * selection list...but it could happen.
796 fprintf(stderr, "selectdevs: couldn't"
797 " find %s%d in selection "
799 devices[j].device_name,
800 devices[j].unit_number);
805 * We do different things based upon the
806 * mode we're in. If we're in add or only
807 * mode, we go ahead and select this device
808 * if it hasn't already been selected. If
809 * it has already been selected, we leave
810 * it alone so we don't mess up the
811 * selection ordering. Manually specified
812 * devices have already been selected, and
813 * they have higher priority than pattern
814 * matched devices. If we're in remove
815 * mode, we de-select the given device and
816 * decrement the selected count.
818 switch(select_mode) {
820 case DS_SELECT_ADDONLY:
822 if ((*dev_select)[k].selected != 0)
824 (*dev_select)[k].selected =
828 case DS_SELECT_REMOVE:
829 (*dev_select)[k].selected = 0;
838 * Here we implement "top" mode. Devices are sorted in the
839 * selection array based on two criteria: whether or not they are
840 * selected (not selection number, just the fact that they are
841 * selected!) and the number of bytes in the "bytes" field of the
842 * selection structure. The bytes field generally must be kept up
843 * by the user. In the future, it may be maintained by library
844 * functions, but for now the user has to do the work.
846 * At first glance, it may seem wrong that we don't go through and
847 * select every device in the case where the user hasn't specified
848 * any devices or patterns. In fact, though, it won't make any
849 * difference in the device sorting. In that particular case (i.e.
850 * when we're in "add" or "only" mode, and the user hasn't
851 * specified anything) the first time through no devices will be
852 * selected, so the only criterion used to sort them will be their
853 * performance. The second time through, and every time thereafter,
854 * all devices will be selected, so again selection won't matter.
856 if (perf_select != 0) {
858 /* Sort the device array by throughput */
859 qsort(*dev_select, *num_selections,
860 sizeof(struct device_selection),
863 if (*num_selected == 0) {
865 * Here we select every device in the array, if it
866 * isn't already selected. Because the 'selected'
867 * variable in the selection array entries contains
868 * the selection order, the devstats routine can show
869 * the devices that were selected first.
871 for (i = 0; i < *num_selections; i++) {
872 if ((*dev_select)[i].selected == 0) {
873 (*dev_select)[i].selected =
879 selection_number = 0;
880 for (i = 0; i < *num_selections; i++) {
881 if ((*dev_select)[i].selected != 0) {
882 (*dev_select)[i].selected =
890 * If we're in the "add" selection mode and if we haven't already
891 * selected maxshowdevs number of devices, go through the array and
892 * select any unselected devices. If we're in "only" mode, we
893 * obviously don't want to select anything other than what the user
894 * specifies. If we're in "remove" mode, it probably isn't a good
895 * idea to go through and select any more devices, since we might
896 * end up selecting something that the user wants removed. Through
897 * more complicated logic, we could actually figure this out, but
898 * that would probably require combining this loop with the various
899 * selections loops above.
901 if ((select_mode == DS_SELECT_ADD) && (*num_selected < maxshowdevs)) {
902 for (i = 0; i < *num_selections; i++)
903 if ((*dev_select)[i].selected == 0) {
904 (*dev_select)[i].selected = ++selection_number;
910 * Look at the number of devices that have been selected. If it
911 * has changed, set the changed variable. Otherwise, if we've
912 * made a backup of the selection list, compare it to the current
913 * selection list to see if the selected devices have changed.
915 if ((changed == 0) && (old_num_selected != *num_selected))
917 else if ((changed == 0) && (old_dev_select != NULL)) {
919 * Now we go through the selection list and we look at
920 * it three different ways.
922 for (i = 0; (i < *num_selections) && (changed == 0) &&
923 (i < old_num_selections); i++) {
925 * If the device at index i in both the new and old
926 * selection arrays has the same device number and
927 * selection status, it hasn't changed. We
928 * continue on to the next index.
930 if (((*dev_select)[i].device_number ==
931 old_dev_select[i].device_number)
932 && ((*dev_select)[i].selected ==
933 old_dev_select[i].selected))
937 * Now, if we're still going through the if
938 * statement, the above test wasn't true. So we
939 * check here to see if the device at index i in
940 * the current array is the same as the device at
941 * index i in the old array. If it is, that means
942 * that its selection number has changed. Set
943 * changed to 1 and exit the loop.
945 else if ((*dev_select)[i].device_number ==
946 old_dev_select[i].device_number) {
951 * If we get here, then the device at index i in
952 * the current array isn't the same device as the
953 * device at index i in the old array.
959 * Search through the old selection array
960 * looking for a device with the same
961 * device number as the device at index i
962 * in the current array. If the selection
963 * status is the same, then we mark it as
964 * found. If the selection status isn't
965 * the same, we break out of the loop.
966 * Since found isn't set, changed will be
969 for (j = 0; j < old_num_selections; j++) {
970 if (((*dev_select)[i].device_number ==
971 old_dev_select[j].device_number)
972 && ((*dev_select)[i].selected ==
973 old_dev_select[j].selected)){
977 else if ((*dev_select)[i].device_number
978 == old_dev_select[j].device_number)
986 if (old_dev_select != NULL)
987 free(old_dev_select);
993 * Comparison routine for qsort() above. Note that the comparison here is
994 * backwards -- generally, it should return a value to indicate whether
995 * arg1 is <, =, or > arg2. Instead, it returns the opposite. The reason
996 * it returns the opposite is so that the selection array will be sorted in
997 * order of decreasing performance. We sort on two parameters. The first
998 * sort key is whether or not one or the other of the devices in question
999 * has been selected. If one of them has, and the other one has not, the
1000 * selected device is automatically more important than the unselected
1001 * device. If neither device is selected, we judge the devices based upon
1005 compare_select(const void *arg1, const void *arg2)
1007 if ((((const struct device_selection *)arg1)->selected)
1008 && (((const struct device_selection *)arg2)->selected == 0))
1010 else if ((((const struct device_selection *)arg1)->selected == 0)
1011 && (((const struct device_selection *)arg2)->selected))
1013 else if (((const struct device_selection *)arg2)->bytes <
1014 ((const struct device_selection *)arg1)->bytes)
1016 else if (((const struct device_selection *)arg2)->bytes >
1017 ((const struct device_selection *)arg1)->bytes)
1024 * Take a string with the general format "arg1,arg2,arg3", and build a
1025 * device matching expression from it.
1028 devstat_buildmatch(char *match_str, struct devstat_match **matches,
1036 /* We can't do much without a string to parse */
1037 if (match_str == NULL) {
1038 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1039 "%s: no match expression", __func__);
1044 * Break the (comma delimited) input string out into separate strings.
1046 for (tempstr = tstr, num_args = 0;
1047 (*tempstr = strsep(&match_str, ",")) != NULL && (num_args < 5);)
1048 if (**tempstr != '\0') {
1050 if (++tempstr >= &tstr[5])
1054 /* The user gave us too many type arguments */
1056 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1057 "%s: too many type arguments", __func__);
1061 if (*num_matches == 0)
1064 *matches = (struct devstat_match *)reallocf(*matches,
1065 sizeof(struct devstat_match) * (*num_matches + 1));
1067 if (*matches == NULL) {
1068 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1069 "%s: Cannot allocate memory for matches list", __func__);
1073 /* Make sure the current entry is clear */
1074 bzero(&matches[0][*num_matches], sizeof(struct devstat_match));
1077 * Step through the arguments the user gave us and build a device
1078 * matching expression from them.
1080 for (i = 0; i < num_args; i++) {
1081 char *tempstr2, *tempstr3;
1084 * Get rid of leading white space.
1087 while (isspace(*tempstr2) && (*tempstr2 != '\0'))
1091 * Get rid of trailing white space.
1093 tempstr3 = &tempstr2[strlen(tempstr2) - 1];
1095 while ((*tempstr3 != '\0') && (tempstr3 > tempstr2)
1096 && (isspace(*tempstr3))) {
1102 * Go through the match table comparing the user's
1103 * arguments to known device types, interfaces, etc.
1105 for (j = 0; match_table[j].match_str != NULL; j++) {
1107 * We do case-insensitive matching, in case someone
1108 * wants to enter "SCSI" instead of "scsi" or
1109 * something like that. Only compare as many
1110 * characters as are in the string in the match
1111 * table. This should help if someone tries to use
1112 * a super-long match expression.
1114 if (strncasecmp(tempstr2, match_table[j].match_str,
1115 strlen(match_table[j].match_str)) == 0) {
1117 * Make sure the user hasn't specified two
1118 * items of the same type, like "da" and
1119 * "cd". One device cannot be both.
1121 if (((*matches)[*num_matches].match_fields &
1122 match_table[j].match_field) != 0) {
1123 snprintf(devstat_errbuf,
1124 sizeof(devstat_errbuf),
1125 "%s: cannot have more than "
1126 "one match item in a single "
1127 "category", __func__);
1131 * If we've gotten this far, we have a
1132 * winner. Set the appropriate fields in
1135 (*matches)[*num_matches].match_fields |=
1136 match_table[j].match_field;
1137 (*matches)[*num_matches].device_type |=
1138 match_table[j].type;
1139 (*matches)[*num_matches].num_match_categories++;
1144 * We should have found a match in the above for loop. If
1145 * not, that means the user entered an invalid device type
1148 if ((*matches)[*num_matches].num_match_categories != (i + 1)) {
1149 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1150 "%s: unknown match item \"%s\"", __func__,
1162 * Compute a number of device statistics. Only one field is mandatory, and
1163 * that is "current". Everything else is optional. The caller passes in
1164 * pointers to variables to hold the various statistics he desires. If he
1165 * doesn't want a particular staistic, he should pass in a NULL pointer.
1171 compute_stats(struct devstat *current, struct devstat *previous,
1172 long double etime, u_int64_t *total_bytes,
1173 u_int64_t *total_transfers, u_int64_t *total_blocks,
1174 long double *kb_per_transfer, long double *transfers_per_second,
1175 long double *mb_per_second, long double *blocks_per_second,
1176 long double *ms_per_transaction)
1178 return(devstat_compute_statistics(current, previous, etime,
1179 total_bytes ? DSM_TOTAL_BYTES : DSM_SKIP,
1181 total_transfers ? DSM_TOTAL_TRANSFERS : DSM_SKIP,
1183 total_blocks ? DSM_TOTAL_BLOCKS : DSM_SKIP,
1185 kb_per_transfer ? DSM_KB_PER_TRANSFER : DSM_SKIP,
1187 transfers_per_second ? DSM_TRANSFERS_PER_SECOND : DSM_SKIP,
1188 transfers_per_second,
1189 mb_per_second ? DSM_MB_PER_SECOND : DSM_SKIP,
1191 blocks_per_second ? DSM_BLOCKS_PER_SECOND : DSM_SKIP,
1193 ms_per_transaction ? DSM_MS_PER_TRANSACTION : DSM_SKIP,
1199 /* This is 1/2^64 */
1200 #define BINTIME_SCALE 5.42101086242752217003726400434970855712890625e-20
1203 devstat_compute_etime(struct bintime *cur_time, struct bintime *prev_time)
1207 etime = cur_time->sec;
1208 etime += cur_time->frac * BINTIME_SCALE;
1209 if (prev_time != NULL) {
1210 etime -= prev_time->sec;
1211 etime -= prev_time->frac * BINTIME_SCALE;
1216 #define DELTA(field, index) \
1217 (current->field[(index)] - (previous ? previous->field[(index)] : 0))
1219 #define DELTA_T(field) \
1220 devstat_compute_etime(¤t->field, \
1221 (previous ? &previous->field : NULL))
1224 devstat_compute_statistics(struct devstat *current, struct devstat *previous,
1225 long double etime, ...)
1227 u_int64_t totalbytes, totalbytesread, totalbyteswrite, totalbytesfree;
1228 u_int64_t totaltransfers, totaltransfersread, totaltransferswrite;
1229 u_int64_t totaltransfersother, totalblocks, totalblocksread;
1230 u_int64_t totalblockswrite, totaltransfersfree, totalblocksfree;
1231 long double totalduration, totaldurationread, totaldurationwrite;
1232 long double totaldurationfree, totaldurationother;
1234 devstat_metric metric;
1236 long double *destld;
1242 * current is the only mandatory field.
1244 if (current == NULL) {
1245 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1246 "%s: current stats structure was NULL", __func__);
1250 totalbytesread = DELTA(bytes, DEVSTAT_READ);
1251 totalbyteswrite = DELTA(bytes, DEVSTAT_WRITE);
1252 totalbytesfree = DELTA(bytes, DEVSTAT_FREE);
1253 totalbytes = totalbytesread + totalbyteswrite + totalbytesfree;
1255 totaltransfersread = DELTA(operations, DEVSTAT_READ);
1256 totaltransferswrite = DELTA(operations, DEVSTAT_WRITE);
1257 totaltransfersother = DELTA(operations, DEVSTAT_NO_DATA);
1258 totaltransfersfree = DELTA(operations, DEVSTAT_FREE);
1259 totaltransfers = totaltransfersread + totaltransferswrite +
1260 totaltransfersother + totaltransfersfree;
1262 totalblocks = totalbytes;
1263 totalblocksread = totalbytesread;
1264 totalblockswrite = totalbyteswrite;
1265 totalblocksfree = totalbytesfree;
1267 if (current->block_size > 0) {
1268 totalblocks /= current->block_size;
1269 totalblocksread /= current->block_size;
1270 totalblockswrite /= current->block_size;
1271 totalblocksfree /= current->block_size;
1274 totalblocksread /= 512;
1275 totalblockswrite /= 512;
1276 totalblocksfree /= 512;
1279 totaldurationread = DELTA_T(duration[DEVSTAT_READ]);
1280 totaldurationwrite = DELTA_T(duration[DEVSTAT_WRITE]);
1281 totaldurationfree = DELTA_T(duration[DEVSTAT_FREE]);
1282 totaldurationother = DELTA_T(duration[DEVSTAT_NO_DATA]);
1283 totalduration = totaldurationread + totaldurationwrite +
1284 totaldurationfree + totaldurationother;
1286 va_start(ap, etime);
1288 while ((metric = (devstat_metric)va_arg(ap, devstat_metric)) != 0) {
1290 if (metric == DSM_NONE)
1293 if (metric >= DSM_MAX) {
1294 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1295 "%s: metric %d is out of range", __func__,
1301 switch (devstat_arg_list[metric].argtype) {
1302 case DEVSTAT_ARG_UINT64:
1303 destu64 = (u_int64_t *)va_arg(ap, u_int64_t *);
1305 case DEVSTAT_ARG_LD:
1306 destld = (long double *)va_arg(ap, long double *);
1308 case DEVSTAT_ARG_SKIP:
1309 destld = (long double *)va_arg(ap, long double *);
1314 break; /* NOTREACHED */
1317 if (devstat_arg_list[metric].argtype == DEVSTAT_ARG_SKIP)
1321 case DSM_TOTAL_BYTES:
1322 *destu64 = totalbytes;
1324 case DSM_TOTAL_BYTES_READ:
1325 *destu64 = totalbytesread;
1327 case DSM_TOTAL_BYTES_WRITE:
1328 *destu64 = totalbyteswrite;
1330 case DSM_TOTAL_BYTES_FREE:
1331 *destu64 = totalbytesfree;
1333 case DSM_TOTAL_TRANSFERS:
1334 *destu64 = totaltransfers;
1336 case DSM_TOTAL_TRANSFERS_READ:
1337 *destu64 = totaltransfersread;
1339 case DSM_TOTAL_TRANSFERS_WRITE:
1340 *destu64 = totaltransferswrite;
1342 case DSM_TOTAL_TRANSFERS_FREE:
1343 *destu64 = totaltransfersfree;
1345 case DSM_TOTAL_TRANSFERS_OTHER:
1346 *destu64 = totaltransfersother;
1348 case DSM_TOTAL_BLOCKS:
1349 *destu64 = totalblocks;
1351 case DSM_TOTAL_BLOCKS_READ:
1352 *destu64 = totalblocksread;
1354 case DSM_TOTAL_BLOCKS_WRITE:
1355 *destu64 = totalblockswrite;
1357 case DSM_TOTAL_BLOCKS_FREE:
1358 *destu64 = totalblocksfree;
1360 case DSM_KB_PER_TRANSFER:
1361 *destld = totalbytes;
1363 if (totaltransfers > 0)
1364 *destld /= totaltransfers;
1368 case DSM_KB_PER_TRANSFER_READ:
1369 *destld = totalbytesread;
1371 if (totaltransfersread > 0)
1372 *destld /= totaltransfersread;
1376 case DSM_KB_PER_TRANSFER_WRITE:
1377 *destld = totalbyteswrite;
1379 if (totaltransferswrite > 0)
1380 *destld /= totaltransferswrite;
1384 case DSM_KB_PER_TRANSFER_FREE:
1385 *destld = totalbytesfree;
1387 if (totaltransfersfree > 0)
1388 *destld /= totaltransfersfree;
1392 case DSM_TRANSFERS_PER_SECOND:
1394 *destld = totaltransfers;
1399 case DSM_TRANSFERS_PER_SECOND_READ:
1401 *destld = totaltransfersread;
1406 case DSM_TRANSFERS_PER_SECOND_WRITE:
1408 *destld = totaltransferswrite;
1413 case DSM_TRANSFERS_PER_SECOND_FREE:
1415 *destld = totaltransfersfree;
1420 case DSM_TRANSFERS_PER_SECOND_OTHER:
1422 *destld = totaltransfersother;
1427 case DSM_MB_PER_SECOND:
1428 *destld = totalbytes;
1429 *destld /= 1024 * 1024;
1435 case DSM_MB_PER_SECOND_READ:
1436 *destld = totalbytesread;
1437 *destld /= 1024 * 1024;
1443 case DSM_MB_PER_SECOND_WRITE:
1444 *destld = totalbyteswrite;
1445 *destld /= 1024 * 1024;
1451 case DSM_MB_PER_SECOND_FREE:
1452 *destld = totalbytesfree;
1453 *destld /= 1024 * 1024;
1459 case DSM_BLOCKS_PER_SECOND:
1460 *destld = totalblocks;
1466 case DSM_BLOCKS_PER_SECOND_READ:
1467 *destld = totalblocksread;
1473 case DSM_BLOCKS_PER_SECOND_WRITE:
1474 *destld = totalblockswrite;
1480 case DSM_BLOCKS_PER_SECOND_FREE:
1481 *destld = totalblocksfree;
1488 * Some devstat callers update the duration and some don't.
1489 * So this will only be accurate if they provide the
1492 case DSM_MS_PER_TRANSACTION:
1493 if (totaltransfers > 0) {
1494 *destld = totalduration;
1495 *destld /= totaltransfers;
1500 case DSM_MS_PER_TRANSACTION_READ:
1501 if (totaltransfersread > 0) {
1502 *destld = totaldurationread;
1503 *destld /= totaltransfersread;
1508 case DSM_MS_PER_TRANSACTION_WRITE:
1509 if (totaltransferswrite > 0) {
1510 *destld = totaldurationwrite;
1511 *destld /= totaltransferswrite;
1516 case DSM_MS_PER_TRANSACTION_FREE:
1517 if (totaltransfersfree > 0) {
1518 *destld = totaldurationfree;
1519 *destld /= totaltransfersfree;
1524 case DSM_MS_PER_TRANSACTION_OTHER:
1525 if (totaltransfersother > 0) {
1526 *destld = totaldurationother;
1527 *destld /= totaltransfersother;
1533 *destld = DELTA_T(busy_time);
1541 case DSM_QUEUE_LENGTH:
1542 *destu64 = current->start_count - current->end_count;
1544 case DSM_TOTAL_DURATION:
1545 *destld = totalduration;
1547 case DSM_TOTAL_DURATION_READ:
1548 *destld = totaldurationread;
1550 case DSM_TOTAL_DURATION_WRITE:
1551 *destld = totaldurationwrite;
1553 case DSM_TOTAL_DURATION_FREE:
1554 *destld = totaldurationfree;
1556 case DSM_TOTAL_DURATION_OTHER:
1557 *destld = totaldurationother;
1559 case DSM_TOTAL_BUSY_TIME:
1560 *destld = DELTA_T(busy_time);
1563 * XXX: comment out the default block to see if any case's are missing.
1568 * This shouldn't happen, since we should have
1569 * caught any out of range metrics at the top of
1572 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1573 "%s: unknown metric %d", __func__, metric);
1576 break; /* NOTREACHED */
1588 readkmem(kvm_t *kd, unsigned long addr, void *buf, size_t nbytes)
1591 if (kvm_read(kd, addr, buf, nbytes) == -1) {
1592 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1593 "%s: error reading value (kvm_read): %s", __func__,
1601 readkmem_nl(kvm_t *kd, const char *name, void *buf, size_t nbytes)
1605 nl[0].n_name = (char *)name;
1606 nl[1].n_name = NULL;
1608 if (kvm_nlist(kd, nl) == -1) {
1609 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1610 "%s: error getting name list (kvm_nlist): %s",
1611 __func__, kvm_geterr(kd));
1614 return(readkmem(kd, nl[0].n_value, buf, nbytes));
1618 * This duplicates the functionality of the kernel sysctl handler for poking
1619 * through crash dumps.
1622 get_devstat_kvm(kvm_t *kd)
1626 struct devstat *nds;
1628 struct devstatlist dhead;
1632 if ((num_devs = devstat_getnumdevs(kd)) <= 0)
1634 if (KREADNL(kd, X_DEVICE_STATQ, dhead) == -1)
1637 nds = STAILQ_FIRST(&dhead);
1639 if ((rv = malloc(sizeof(gen))) == NULL) {
1640 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1641 "%s: out of memory (initial malloc failed)",
1645 gen = devstat_getgeneration(kd);
1646 memcpy(rv, &gen, sizeof(gen));
1649 * Now push out all the devices.
1651 for (i = 0; (nds != NULL) && (i < num_devs);
1652 nds = STAILQ_NEXT(nds, dev_links), i++) {
1653 if (readkmem(kd, (long)nds, &ds, sizeof(ds)) == -1) {
1658 rv = (char *)reallocf(rv, sizeof(gen) +
1659 sizeof(ds) * (i + 1));
1661 snprintf(devstat_errbuf, sizeof(devstat_errbuf),
1662 "%s: out of memory (malloc failed)",
1666 memcpy(rv + wp, &ds, sizeof(ds));