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freebsd-skq/lib/libdevstat/devstat.c
pfg 260ba0bff1 lib: further adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-26 02:00:33 +00:00

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1997, 1998 Kenneth D. Merry.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/errno.h>
#include <sys/resource.h>
#include <sys/queue.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <kvm.h>
#include <nlist.h>
#include "devstat.h"
int
compute_stats(struct devstat *current, struct devstat *previous,
long double etime, u_int64_t *total_bytes,
u_int64_t *total_transfers, u_int64_t *total_blocks,
long double *kb_per_transfer, long double *transfers_per_second,
long double *mb_per_second, long double *blocks_per_second,
long double *ms_per_transaction);
typedef enum {
DEVSTAT_ARG_NOTYPE,
DEVSTAT_ARG_UINT64,
DEVSTAT_ARG_LD,
DEVSTAT_ARG_SKIP
} devstat_arg_type;
char devstat_errbuf[DEVSTAT_ERRBUF_SIZE];
/*
* Table to match descriptive strings with device types. These are in
* order from most common to least common to speed search time.
*/
struct devstat_match_table match_table[] = {
{"da", DEVSTAT_TYPE_DIRECT, DEVSTAT_MATCH_TYPE},
{"cd", DEVSTAT_TYPE_CDROM, DEVSTAT_MATCH_TYPE},
{"scsi", DEVSTAT_TYPE_IF_SCSI, DEVSTAT_MATCH_IF},
{"ide", DEVSTAT_TYPE_IF_IDE, DEVSTAT_MATCH_IF},
{"other", DEVSTAT_TYPE_IF_OTHER, DEVSTAT_MATCH_IF},
{"worm", DEVSTAT_TYPE_WORM, DEVSTAT_MATCH_TYPE},
{"sa", DEVSTAT_TYPE_SEQUENTIAL,DEVSTAT_MATCH_TYPE},
{"pass", DEVSTAT_TYPE_PASS, DEVSTAT_MATCH_PASS},
{"optical", DEVSTAT_TYPE_OPTICAL, DEVSTAT_MATCH_TYPE},
{"array", DEVSTAT_TYPE_STORARRAY, DEVSTAT_MATCH_TYPE},
{"changer", DEVSTAT_TYPE_CHANGER, DEVSTAT_MATCH_TYPE},
{"scanner", DEVSTAT_TYPE_SCANNER, DEVSTAT_MATCH_TYPE},
{"printer", DEVSTAT_TYPE_PRINTER, DEVSTAT_MATCH_TYPE},
{"floppy", DEVSTAT_TYPE_FLOPPY, DEVSTAT_MATCH_TYPE},
{"proc", DEVSTAT_TYPE_PROCESSOR, DEVSTAT_MATCH_TYPE},
{"comm", DEVSTAT_TYPE_COMM, DEVSTAT_MATCH_TYPE},
{"enclosure", DEVSTAT_TYPE_ENCLOSURE, DEVSTAT_MATCH_TYPE},
{NULL, 0, 0}
};
struct devstat_args {
devstat_metric metric;
devstat_arg_type argtype;
} devstat_arg_list[] = {
{ DSM_NONE, DEVSTAT_ARG_NOTYPE },
{ DSM_TOTAL_BYTES, DEVSTAT_ARG_UINT64 },
{ DSM_TOTAL_BYTES_READ, DEVSTAT_ARG_UINT64 },
{ DSM_TOTAL_BYTES_WRITE, DEVSTAT_ARG_UINT64 },
{ DSM_TOTAL_TRANSFERS, DEVSTAT_ARG_UINT64 },
{ DSM_TOTAL_TRANSFERS_READ, DEVSTAT_ARG_UINT64 },
{ DSM_TOTAL_TRANSFERS_WRITE, DEVSTAT_ARG_UINT64 },
{ DSM_TOTAL_TRANSFERS_OTHER, DEVSTAT_ARG_UINT64 },
{ DSM_TOTAL_BLOCKS, DEVSTAT_ARG_UINT64 },
{ DSM_TOTAL_BLOCKS_READ, DEVSTAT_ARG_UINT64 },
{ DSM_TOTAL_BLOCKS_WRITE, DEVSTAT_ARG_UINT64 },
{ DSM_KB_PER_TRANSFER, DEVSTAT_ARG_LD },
{ DSM_KB_PER_TRANSFER_READ, DEVSTAT_ARG_LD },
{ DSM_KB_PER_TRANSFER_WRITE, DEVSTAT_ARG_LD },
{ DSM_TRANSFERS_PER_SECOND, DEVSTAT_ARG_LD },
{ DSM_TRANSFERS_PER_SECOND_READ, DEVSTAT_ARG_LD },
{ DSM_TRANSFERS_PER_SECOND_WRITE, DEVSTAT_ARG_LD },
{ DSM_TRANSFERS_PER_SECOND_OTHER, DEVSTAT_ARG_LD },
{ DSM_MB_PER_SECOND, DEVSTAT_ARG_LD },
{ DSM_MB_PER_SECOND_READ, DEVSTAT_ARG_LD },
{ DSM_MB_PER_SECOND_WRITE, DEVSTAT_ARG_LD },
{ DSM_BLOCKS_PER_SECOND, DEVSTAT_ARG_LD },
{ DSM_BLOCKS_PER_SECOND_READ, DEVSTAT_ARG_LD },
{ DSM_BLOCKS_PER_SECOND_WRITE, DEVSTAT_ARG_LD },
{ DSM_MS_PER_TRANSACTION, DEVSTAT_ARG_LD },
{ DSM_MS_PER_TRANSACTION_READ, DEVSTAT_ARG_LD },
{ DSM_MS_PER_TRANSACTION_WRITE, DEVSTAT_ARG_LD },
{ DSM_SKIP, DEVSTAT_ARG_SKIP },
{ DSM_TOTAL_BYTES_FREE, DEVSTAT_ARG_UINT64 },
{ DSM_TOTAL_TRANSFERS_FREE, DEVSTAT_ARG_UINT64 },
{ DSM_TOTAL_BLOCKS_FREE, DEVSTAT_ARG_UINT64 },
{ DSM_KB_PER_TRANSFER_FREE, DEVSTAT_ARG_LD },
{ DSM_MB_PER_SECOND_FREE, DEVSTAT_ARG_LD },
{ DSM_TRANSFERS_PER_SECOND_FREE, DEVSTAT_ARG_LD },
{ DSM_BLOCKS_PER_SECOND_FREE, DEVSTAT_ARG_LD },
{ DSM_MS_PER_TRANSACTION_OTHER, DEVSTAT_ARG_LD },
{ DSM_MS_PER_TRANSACTION_FREE, DEVSTAT_ARG_LD },
{ DSM_BUSY_PCT, DEVSTAT_ARG_LD },
{ DSM_QUEUE_LENGTH, DEVSTAT_ARG_UINT64 },
{ DSM_TOTAL_DURATION, DEVSTAT_ARG_LD },
{ DSM_TOTAL_DURATION_READ, DEVSTAT_ARG_LD },
{ DSM_TOTAL_DURATION_WRITE, DEVSTAT_ARG_LD },
{ DSM_TOTAL_DURATION_FREE, DEVSTAT_ARG_LD },
{ DSM_TOTAL_DURATION_OTHER, DEVSTAT_ARG_LD },
{ DSM_TOTAL_BUSY_TIME, DEVSTAT_ARG_LD },
};
static const char *namelist[] = {
#define X_NUMDEVS 0
"_devstat_num_devs",
#define X_GENERATION 1
"_devstat_generation",
#define X_VERSION 2
"_devstat_version",
#define X_DEVICE_STATQ 3
"_device_statq",
#define X_TIME_UPTIME 4
"_time_uptime",
#define X_END 5
};
/*
* Local function declarations.
*/
static int compare_select(const void *arg1, const void *arg2);
static int readkmem(kvm_t *kd, unsigned long addr, void *buf, size_t nbytes);
static int readkmem_nl(kvm_t *kd, const char *name, void *buf, size_t nbytes);
static char *get_devstat_kvm(kvm_t *kd);
#define KREADNL(kd, var, val) \
readkmem_nl(kd, namelist[var], &val, sizeof(val))
int
devstat_getnumdevs(kvm_t *kd)
{
size_t numdevsize;
int numdevs;
numdevsize = sizeof(int);
/*
* Find out how many devices we have in the system.
*/
if (kd == NULL) {
if (sysctlbyname("kern.devstat.numdevs", &numdevs,
&numdevsize, NULL, 0) == -1) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: error getting number of devices\n"
"%s: %s", __func__, __func__,
strerror(errno));
return(-1);
} else
return(numdevs);
} else {
if (KREADNL(kd, X_NUMDEVS, numdevs) == -1)
return(-1);
else
return(numdevs);
}
}
/*
* This is an easy way to get the generation number, but the generation is
* supplied in a more atmoic manner by the kern.devstat.all sysctl.
* Because this generation sysctl is separate from the statistics sysctl,
* the device list and the generation could change between the time that
* this function is called and the device list is retrieved.
*/
long
devstat_getgeneration(kvm_t *kd)
{
size_t gensize;
long generation;
gensize = sizeof(long);
/*
* Get the current generation number.
*/
if (kd == NULL) {
if (sysctlbyname("kern.devstat.generation", &generation,
&gensize, NULL, 0) == -1) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: error getting devstat generation\n%s: %s",
__func__, __func__, strerror(errno));
return(-1);
} else
return(generation);
} else {
if (KREADNL(kd, X_GENERATION, generation) == -1)
return(-1);
else
return(generation);
}
}
/*
* Get the current devstat version. The return value of this function
* should be compared with DEVSTAT_VERSION, which is defined in
* sys/devicestat.h. This will enable userland programs to determine
* whether they are out of sync with the kernel.
*/
int
devstat_getversion(kvm_t *kd)
{
size_t versize;
int version;
versize = sizeof(int);
/*
* Get the current devstat version.
*/
if (kd == NULL) {
if (sysctlbyname("kern.devstat.version", &version, &versize,
NULL, 0) == -1) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: error getting devstat version\n%s: %s",
__func__, __func__, strerror(errno));
return(-1);
} else
return(version);
} else {
if (KREADNL(kd, X_VERSION, version) == -1)
return(-1);
else
return(version);
}
}
/*
* Check the devstat version we know about against the devstat version the
* kernel knows about. If they don't match, print an error into the
* devstat error buffer, and return -1. If they match, return 0.
*/
int
devstat_checkversion(kvm_t *kd)
{
int buflen, res, retval = 0, version;
version = devstat_getversion(kd);
if (version != DEVSTAT_VERSION) {
/*
* If getversion() returns an error (i.e. -1), then it
* has printed an error message in the buffer. Therefore,
* we need to add a \n to the end of that message before we
* print our own message in the buffer.
*/
if (version == -1)
buflen = strlen(devstat_errbuf);
else
buflen = 0;
res = snprintf(devstat_errbuf + buflen,
DEVSTAT_ERRBUF_SIZE - buflen,
"%s%s: userland devstat version %d is not "
"the same as the kernel\n%s: devstat "
"version %d\n", version == -1 ? "\n" : "",
__func__, DEVSTAT_VERSION, __func__, version);
if (res < 0)
devstat_errbuf[buflen] = '\0';
buflen = strlen(devstat_errbuf);
if (version < DEVSTAT_VERSION)
res = snprintf(devstat_errbuf + buflen,
DEVSTAT_ERRBUF_SIZE - buflen,
"%s: libdevstat newer than kernel\n",
__func__);
else
res = snprintf(devstat_errbuf + buflen,
DEVSTAT_ERRBUF_SIZE - buflen,
"%s: kernel newer than libdevstat\n",
__func__);
if (res < 0)
devstat_errbuf[buflen] = '\0';
retval = -1;
}
return(retval);
}
/*
* Get the current list of devices and statistics, and the current
* generation number.
*
* Return values:
* -1 -- error
* 0 -- device list is unchanged
* 1 -- device list has changed
*/
int
devstat_getdevs(kvm_t *kd, struct statinfo *stats)
{
int error;
size_t dssize;
long oldgeneration;
int retval = 0;
struct devinfo *dinfo;
struct timespec ts;
dinfo = stats->dinfo;
if (dinfo == NULL) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: stats->dinfo was NULL", __func__);
return(-1);
}
oldgeneration = dinfo->generation;
if (kd == NULL) {
clock_gettime(CLOCK_MONOTONIC, &ts);
stats->snap_time = ts.tv_sec + ts.tv_nsec * 1e-9;
/* If this is our first time through, mem_ptr will be null. */
if (dinfo->mem_ptr == NULL) {
/*
* Get the number of devices. If it's negative, it's an
* error. Don't bother setting the error string, since
* getnumdevs() has already done that for us.
*/
if ((dinfo->numdevs = devstat_getnumdevs(kd)) < 0)
return(-1);
/*
* The kern.devstat.all sysctl returns the current
* generation number, as well as all the devices.
* So we need four bytes more.
*/
dssize = (dinfo->numdevs * sizeof(struct devstat)) +
sizeof(long);
dinfo->mem_ptr = (u_int8_t *)malloc(dssize);
if (dinfo->mem_ptr == NULL) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: Cannot allocate memory for mem_ptr element",
__func__);
return(-1);
}
} else
dssize = (dinfo->numdevs * sizeof(struct devstat)) +
sizeof(long);
/*
* Request all of the devices. We only really allow for one
* ENOMEM failure. It would, of course, be possible to just go
* in a loop and keep reallocing the device structure until we
* don't get ENOMEM back. I'm not sure it's worth it, though.
* If devices are being added to the system that quickly, maybe
* the user can just wait until all devices are added.
*/
for (;;) {
error = sysctlbyname("kern.devstat.all",
dinfo->mem_ptr,
&dssize, NULL, 0);
if (error != -1 || errno != EBUSY)
break;
}
if (error == -1) {
/*
* If we get ENOMEM back, that means that there are
* more devices now, so we need to allocate more
* space for the device array.
*/
if (errno == ENOMEM) {
/*
* No need to set the error string here,
* devstat_getnumdevs() will do that if it fails.
*/
if ((dinfo->numdevs = devstat_getnumdevs(kd)) < 0)
return(-1);
dssize = (dinfo->numdevs *
sizeof(struct devstat)) + sizeof(long);
dinfo->mem_ptr = (u_int8_t *)
realloc(dinfo->mem_ptr, dssize);
if ((error = sysctlbyname("kern.devstat.all",
dinfo->mem_ptr, &dssize, NULL, 0)) == -1) {
snprintf(devstat_errbuf,
sizeof(devstat_errbuf),
"%s: error getting device "
"stats\n%s: %s", __func__,
__func__, strerror(errno));
return(-1);
}
} else {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: error getting device stats\n"
"%s: %s", __func__, __func__,
strerror(errno));
return(-1);
}
}
} else {
if (KREADNL(kd, X_TIME_UPTIME, ts.tv_sec) == -1)
return(-1);
else
stats->snap_time = ts.tv_sec;
/*
* This is of course non-atomic, but since we are working
* on a core dump, the generation is unlikely to change
*/
if ((dinfo->numdevs = devstat_getnumdevs(kd)) == -1)
return(-1);
if ((dinfo->mem_ptr = (u_int8_t *)get_devstat_kvm(kd)) == NULL)
return(-1);
}
/*
* The sysctl spits out the generation as the first four bytes,
* then all of the device statistics structures.
*/
dinfo->generation = *(long *)dinfo->mem_ptr;
/*
* If the generation has changed, and if the current number of
* devices is not the same as the number of devices recorded in the
* devinfo structure, it is likely that the device list has shrunk.
* The reason that it is likely that the device list has shrunk in
* this case is that if the device list has grown, the sysctl above
* will return an ENOMEM error, and we will reset the number of
* devices and reallocate the device array. If the second sysctl
* fails, we will return an error and therefore never get to this
* point. If the device list has shrunk, the sysctl will not
* return an error since we have more space allocated than is
* necessary. So, in the shrinkage case, we catch it here and
* reallocate the array so that we don't use any more space than is
* necessary.
*/
if (oldgeneration != dinfo->generation) {
if (devstat_getnumdevs(kd) != dinfo->numdevs) {
if ((dinfo->numdevs = devstat_getnumdevs(kd)) < 0)
return(-1);
dssize = (dinfo->numdevs * sizeof(struct devstat)) +
sizeof(long);
dinfo->mem_ptr = (u_int8_t *)realloc(dinfo->mem_ptr,
dssize);
}
retval = 1;
}
dinfo->devices = (struct devstat *)(dinfo->mem_ptr + sizeof(long));
return(retval);
}
/*
* selectdevs():
*
* Devices are selected/deselected based upon the following criteria:
* - devices specified by the user on the command line
* - devices matching any device type expressions given on the command line
* - devices with the highest I/O, if 'top' mode is enabled
* - the first n unselected devices in the device list, if maxshowdevs
* devices haven't already been selected and if the user has not
* specified any devices on the command line and if we're in "add" mode.
*
* Input parameters:
* - device selection list (dev_select)
* - current number of devices selected (num_selected)
* - total number of devices in the selection list (num_selections)
* - devstat generation as of the last time selectdevs() was called
* (select_generation)
* - current devstat generation (current_generation)
* - current list of devices and statistics (devices)
* - number of devices in the current device list (numdevs)
* - compiled version of the command line device type arguments (matches)
* - This is optional. If the number of devices is 0, this will be ignored.
* - The matching code pays attention to the current selection mode. So
* if you pass in a matching expression, it will be evaluated based
* upon the selection mode that is passed in. See below for details.
* - number of device type matching expressions (num_matches)
* - Set to 0 to disable the matching code.
* - list of devices specified on the command line by the user (dev_selections)
* - number of devices selected on the command line by the user
* (num_dev_selections)
* - Our selection mode. There are four different selection modes:
* - add mode. (DS_SELECT_ADD) Any devices matching devices explicitly
* selected by the user or devices matching a pattern given by the
* user will be selected in addition to devices that are already
* selected. Additional devices will be selected, up to maxshowdevs
* number of devices.
* - only mode. (DS_SELECT_ONLY) Only devices matching devices
* explicitly given by the user or devices matching a pattern
* given by the user will be selected. No other devices will be
* selected.
* - addonly mode. (DS_SELECT_ADDONLY) This is similar to add and
* only. Basically, this will not de-select any devices that are
* current selected, as only mode would, but it will also not
* gratuitously select up to maxshowdevs devices as add mode would.
* - remove mode. (DS_SELECT_REMOVE) Any devices matching devices
* explicitly selected by the user or devices matching a pattern
* given by the user will be de-selected.
* - maximum number of devices we can select (maxshowdevs)
* - flag indicating whether or not we're in 'top' mode (perf_select)
*
* Output data:
* - the device selection list may be modified and passed back out
* - the number of devices selected and the total number of items in the
* device selection list may be changed
* - the selection generation may be changed to match the current generation
*
* Return values:
* -1 -- error
* 0 -- selected devices are unchanged
* 1 -- selected devices changed
*/
int
devstat_selectdevs(struct device_selection **dev_select, int *num_selected,
int *num_selections, long *select_generation,
long current_generation, struct devstat *devices,
int numdevs, struct devstat_match *matches, int num_matches,
char **dev_selections, int num_dev_selections,
devstat_select_mode select_mode, int maxshowdevs,
int perf_select)
{
int i, j, k;
int init_selections = 0, init_selected_var = 0;
struct device_selection *old_dev_select = NULL;
int old_num_selections = 0, old_num_selected;
int selection_number = 0;
int changed = 0, found = 0;
if ((dev_select == NULL) || (devices == NULL) || (numdevs < 0))
return(-1);
/*
* We always want to make sure that we have as many dev_select
* entries as there are devices.
*/
/*
* In this case, we haven't selected devices before.
*/
if (*dev_select == NULL) {
*dev_select = (struct device_selection *)malloc(numdevs *
sizeof(struct device_selection));
*select_generation = current_generation;
init_selections = 1;
changed = 1;
/*
* In this case, we have selected devices before, but the device
* list has changed since we last selected devices, so we need to
* either enlarge or reduce the size of the device selection list.
*/
} else if (*num_selections != numdevs) {
*dev_select = (struct device_selection *)reallocf(*dev_select,
numdevs * sizeof(struct device_selection));
*select_generation = current_generation;
init_selections = 1;
/*
* In this case, we've selected devices before, and the selection
* list is the same size as it was the last time, but the device
* list has changed.
*/
} else if (*select_generation < current_generation) {
*select_generation = current_generation;
init_selections = 1;
}
if (*dev_select == NULL) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: Cannot (re)allocate memory for dev_select argument",
__func__);
return(-1);
}
/*
* If we're in "only" mode, we want to clear out the selected
* variable since we're going to select exactly what the user wants
* this time through.
*/
if (select_mode == DS_SELECT_ONLY)
init_selected_var = 1;
/*
* In all cases, we want to back up the number of selected devices.
* It is a quick and accurate way to determine whether the selected
* devices have changed.
*/
old_num_selected = *num_selected;
/*
* We want to make a backup of the current selection list if
* the list of devices has changed, or if we're in performance
* selection mode. In both cases, we don't want to make a backup
* if we already know for sure that the list will be different.
* This is certainly the case if this is our first time through the
* selection code.
*/
if (((init_selected_var != 0) || (init_selections != 0)
|| (perf_select != 0)) && (changed == 0)){
old_dev_select = (struct device_selection *)malloc(
*num_selections * sizeof(struct device_selection));
if (old_dev_select == NULL) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: Cannot allocate memory for selection list backup",
__func__);
return(-1);
}
old_num_selections = *num_selections;
bcopy(*dev_select, old_dev_select,
sizeof(struct device_selection) * *num_selections);
}
if (init_selections != 0) {
bzero(*dev_select, sizeof(struct device_selection) * numdevs);
for (i = 0; i < numdevs; i++) {
(*dev_select)[i].device_number =
devices[i].device_number;
strncpy((*dev_select)[i].device_name,
devices[i].device_name,
DEVSTAT_NAME_LEN);
(*dev_select)[i].device_name[DEVSTAT_NAME_LEN - 1]='\0';
(*dev_select)[i].unit_number = devices[i].unit_number;
(*dev_select)[i].position = i;
}
*num_selections = numdevs;
} else if (init_selected_var != 0) {
for (i = 0; i < numdevs; i++)
(*dev_select)[i].selected = 0;
}
/* we haven't gotten around to selecting anything yet.. */
if ((select_mode == DS_SELECT_ONLY) || (init_selections != 0)
|| (init_selected_var != 0))
*num_selected = 0;
/*
* Look through any devices the user specified on the command line
* and see if they match known devices. If so, select them.
*/
for (i = 0; (i < *num_selections) && (num_dev_selections > 0); i++) {
char tmpstr[80];
snprintf(tmpstr, sizeof(tmpstr), "%s%d",
(*dev_select)[i].device_name,
(*dev_select)[i].unit_number);
for (j = 0; j < num_dev_selections; j++) {
if (strcmp(tmpstr, dev_selections[j]) == 0) {
/*
* Here we do different things based on the
* mode we're in. If we're in add or
* addonly mode, we only select this device
* if it hasn't already been selected.
* Otherwise, we would be unnecessarily
* changing the selection order and
* incrementing the selection count. If
* we're in only mode, we unconditionally
* select this device, since in only mode
* any previous selections are erased and
* manually specified devices are the first
* ones to be selected. If we're in remove
* mode, we de-select the specified device and
* decrement the selection count.
*/
switch(select_mode) {
case DS_SELECT_ADD:
case DS_SELECT_ADDONLY:
if ((*dev_select)[i].selected)
break;
/* FALLTHROUGH */
case DS_SELECT_ONLY:
(*dev_select)[i].selected =
++selection_number;
(*num_selected)++;
break;
case DS_SELECT_REMOVE:
(*dev_select)[i].selected = 0;
(*num_selected)--;
/*
* This isn't passed back out, we
* just use it to keep track of
* how many devices we've removed.
*/
num_dev_selections--;
break;
}
break;
}
}
}
/*
* Go through the user's device type expressions and select devices
* accordingly. We only do this if the number of devices already
* selected is less than the maximum number we can show.
*/
for (i = 0; (i < num_matches) && (*num_selected < maxshowdevs); i++) {
/* We should probably indicate some error here */
if ((matches[i].match_fields == DEVSTAT_MATCH_NONE)
|| (matches[i].num_match_categories <= 0))
continue;
for (j = 0; j < numdevs; j++) {
int num_match_categories;
num_match_categories = matches[i].num_match_categories;
/*
* Determine whether or not the current device
* matches the given matching expression. This if
* statement consists of three components:
* - the device type check
* - the device interface check
* - the passthrough check
* If a the matching test is successful, it
* decrements the number of matching categories,
* and if we've reached the last element that
* needed to be matched, the if statement succeeds.
*
*/
if ((((matches[i].match_fields & DEVSTAT_MATCH_TYPE)!=0)
&& ((devices[j].device_type & DEVSTAT_TYPE_MASK) ==
(matches[i].device_type & DEVSTAT_TYPE_MASK))
&&(((matches[i].match_fields & DEVSTAT_MATCH_PASS)!=0)
|| (((matches[i].match_fields &
DEVSTAT_MATCH_PASS) == 0)
&& ((devices[j].device_type &
DEVSTAT_TYPE_PASS) == 0)))
&& (--num_match_categories == 0))
|| (((matches[i].match_fields & DEVSTAT_MATCH_IF) != 0)
&& ((devices[j].device_type & DEVSTAT_TYPE_IF_MASK) ==
(matches[i].device_type & DEVSTAT_TYPE_IF_MASK))
&&(((matches[i].match_fields & DEVSTAT_MATCH_PASS)!=0)
|| (((matches[i].match_fields &
DEVSTAT_MATCH_PASS) == 0)
&& ((devices[j].device_type &
DEVSTAT_TYPE_PASS) == 0)))
&& (--num_match_categories == 0))
|| (((matches[i].match_fields & DEVSTAT_MATCH_PASS)!=0)
&& ((devices[j].device_type & DEVSTAT_TYPE_PASS) != 0)
&& (--num_match_categories == 0))) {
/*
* This is probably a non-optimal solution
* to the problem that the devices in the
* device list will not be in the same
* order as the devices in the selection
* array.
*/
for (k = 0; k < numdevs; k++) {
if ((*dev_select)[k].position == j) {
found = 1;
break;
}
}
/*
* There shouldn't be a case where a device
* in the device list is not in the
* selection list...but it could happen.
*/
if (found != 1) {
fprintf(stderr, "selectdevs: couldn't"
" find %s%d in selection "
"list\n",
devices[j].device_name,
devices[j].unit_number);
break;
}
/*
* We do different things based upon the
* mode we're in. If we're in add or only
* mode, we go ahead and select this device
* if it hasn't already been selected. If
* it has already been selected, we leave
* it alone so we don't mess up the
* selection ordering. Manually specified
* devices have already been selected, and
* they have higher priority than pattern
* matched devices. If we're in remove
* mode, we de-select the given device and
* decrement the selected count.
*/
switch(select_mode) {
case DS_SELECT_ADD:
case DS_SELECT_ADDONLY:
case DS_SELECT_ONLY:
if ((*dev_select)[k].selected != 0)
break;
(*dev_select)[k].selected =
++selection_number;
(*num_selected)++;
break;
case DS_SELECT_REMOVE:
(*dev_select)[k].selected = 0;
(*num_selected)--;
break;
}
}
}
}
/*
* Here we implement "top" mode. Devices are sorted in the
* selection array based on two criteria: whether or not they are
* selected (not selection number, just the fact that they are
* selected!) and the number of bytes in the "bytes" field of the
* selection structure. The bytes field generally must be kept up
* by the user. In the future, it may be maintained by library
* functions, but for now the user has to do the work.
*
* At first glance, it may seem wrong that we don't go through and
* select every device in the case where the user hasn't specified
* any devices or patterns. In fact, though, it won't make any
* difference in the device sorting. In that particular case (i.e.
* when we're in "add" or "only" mode, and the user hasn't
* specified anything) the first time through no devices will be
* selected, so the only criterion used to sort them will be their
* performance. The second time through, and every time thereafter,
* all devices will be selected, so again selection won't matter.
*/
if (perf_select != 0) {
/* Sort the device array by throughput */
qsort(*dev_select, *num_selections,
sizeof(struct device_selection),
compare_select);
if (*num_selected == 0) {
/*
* Here we select every device in the array, if it
* isn't already selected. Because the 'selected'
* variable in the selection array entries contains
* the selection order, the devstats routine can show
* the devices that were selected first.
*/
for (i = 0; i < *num_selections; i++) {
if ((*dev_select)[i].selected == 0) {
(*dev_select)[i].selected =
++selection_number;
(*num_selected)++;
}
}
} else {
selection_number = 0;
for (i = 0; i < *num_selections; i++) {
if ((*dev_select)[i].selected != 0) {
(*dev_select)[i].selected =
++selection_number;
}
}
}
}
/*
* If we're in the "add" selection mode and if we haven't already
* selected maxshowdevs number of devices, go through the array and
* select any unselected devices. If we're in "only" mode, we
* obviously don't want to select anything other than what the user
* specifies. If we're in "remove" mode, it probably isn't a good
* idea to go through and select any more devices, since we might
* end up selecting something that the user wants removed. Through
* more complicated logic, we could actually figure this out, but
* that would probably require combining this loop with the various
* selections loops above.
*/
if ((select_mode == DS_SELECT_ADD) && (*num_selected < maxshowdevs)) {
for (i = 0; i < *num_selections; i++)
if ((*dev_select)[i].selected == 0) {
(*dev_select)[i].selected = ++selection_number;
(*num_selected)++;
}
}
/*
* Look at the number of devices that have been selected. If it
* has changed, set the changed variable. Otherwise, if we've
* made a backup of the selection list, compare it to the current
* selection list to see if the selected devices have changed.
*/
if ((changed == 0) && (old_num_selected != *num_selected))
changed = 1;
else if ((changed == 0) && (old_dev_select != NULL)) {
/*
* Now we go through the selection list and we look at
* it three different ways.
*/
for (i = 0; (i < *num_selections) && (changed == 0) &&
(i < old_num_selections); i++) {
/*
* If the device at index i in both the new and old
* selection arrays has the same device number and
* selection status, it hasn't changed. We
* continue on to the next index.
*/
if (((*dev_select)[i].device_number ==
old_dev_select[i].device_number)
&& ((*dev_select)[i].selected ==
old_dev_select[i].selected))
continue;
/*
* Now, if we're still going through the if
* statement, the above test wasn't true. So we
* check here to see if the device at index i in
* the current array is the same as the device at
* index i in the old array. If it is, that means
* that its selection number has changed. Set
* changed to 1 and exit the loop.
*/
else if ((*dev_select)[i].device_number ==
old_dev_select[i].device_number) {
changed = 1;
break;
}
/*
* If we get here, then the device at index i in
* the current array isn't the same device as the
* device at index i in the old array.
*/
else {
found = 0;
/*
* Search through the old selection array
* looking for a device with the same
* device number as the device at index i
* in the current array. If the selection
* status is the same, then we mark it as
* found. If the selection status isn't
* the same, we break out of the loop.
* Since found isn't set, changed will be
* set to 1 below.
*/
for (j = 0; j < old_num_selections; j++) {
if (((*dev_select)[i].device_number ==
old_dev_select[j].device_number)
&& ((*dev_select)[i].selected ==
old_dev_select[j].selected)){
found = 1;
break;
}
else if ((*dev_select)[i].device_number
== old_dev_select[j].device_number)
break;
}
if (found == 0)
changed = 1;
}
}
}
if (old_dev_select != NULL)
free(old_dev_select);
return(changed);
}
/*
* Comparison routine for qsort() above. Note that the comparison here is
* backwards -- generally, it should return a value to indicate whether
* arg1 is <, =, or > arg2. Instead, it returns the opposite. The reason
* it returns the opposite is so that the selection array will be sorted in
* order of decreasing performance. We sort on two parameters. The first
* sort key is whether or not one or the other of the devices in question
* has been selected. If one of them has, and the other one has not, the
* selected device is automatically more important than the unselected
* device. If neither device is selected, we judge the devices based upon
* performance.
*/
static int
compare_select(const void *arg1, const void *arg2)
{
if ((((const struct device_selection *)arg1)->selected)
&& (((const struct device_selection *)arg2)->selected == 0))
return(-1);
else if ((((const struct device_selection *)arg1)->selected == 0)
&& (((const struct device_selection *)arg2)->selected))
return(1);
else if (((const struct device_selection *)arg2)->bytes <
((const struct device_selection *)arg1)->bytes)
return(-1);
else if (((const struct device_selection *)arg2)->bytes >
((const struct device_selection *)arg1)->bytes)
return(1);
else
return(0);
}
/*
* Take a string with the general format "arg1,arg2,arg3", and build a
* device matching expression from it.
*/
int
devstat_buildmatch(char *match_str, struct devstat_match **matches,
int *num_matches)
{
char *tstr[5];
char **tempstr;
int num_args;
int i, j;
/* We can't do much without a string to parse */
if (match_str == NULL) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: no match expression", __func__);
return(-1);
}
/*
* Break the (comma delimited) input string out into separate strings.
*/
for (tempstr = tstr, num_args = 0;
(*tempstr = strsep(&match_str, ",")) != NULL && (num_args < 5);)
if (**tempstr != '\0') {
num_args++;
if (++tempstr >= &tstr[5])
break;
}
/* The user gave us too many type arguments */
if (num_args > 3) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: too many type arguments", __func__);
return(-1);
}
if (*num_matches == 0)
*matches = NULL;
*matches = (struct devstat_match *)reallocf(*matches,
sizeof(struct devstat_match) * (*num_matches + 1));
if (*matches == NULL) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: Cannot allocate memory for matches list", __func__);
return(-1);
}
/* Make sure the current entry is clear */
bzero(&matches[0][*num_matches], sizeof(struct devstat_match));
/*
* Step through the arguments the user gave us and build a device
* matching expression from them.
*/
for (i = 0; i < num_args; i++) {
char *tempstr2, *tempstr3;
/*
* Get rid of leading white space.
*/
tempstr2 = tstr[i];
while (isspace(*tempstr2) && (*tempstr2 != '\0'))
tempstr2++;
/*
* Get rid of trailing white space.
*/
tempstr3 = &tempstr2[strlen(tempstr2) - 1];
while ((*tempstr3 != '\0') && (tempstr3 > tempstr2)
&& (isspace(*tempstr3))) {
*tempstr3 = '\0';
tempstr3--;
}
/*
* Go through the match table comparing the user's
* arguments to known device types, interfaces, etc.
*/
for (j = 0; match_table[j].match_str != NULL; j++) {
/*
* We do case-insensitive matching, in case someone
* wants to enter "SCSI" instead of "scsi" or
* something like that. Only compare as many
* characters as are in the string in the match
* table. This should help if someone tries to use
* a super-long match expression.
*/
if (strncasecmp(tempstr2, match_table[j].match_str,
strlen(match_table[j].match_str)) == 0) {
/*
* Make sure the user hasn't specified two
* items of the same type, like "da" and
* "cd". One device cannot be both.
*/
if (((*matches)[*num_matches].match_fields &
match_table[j].match_field) != 0) {
snprintf(devstat_errbuf,
sizeof(devstat_errbuf),
"%s: cannot have more than "
"one match item in a single "
"category", __func__);
return(-1);
}
/*
* If we've gotten this far, we have a
* winner. Set the appropriate fields in
* the match entry.
*/
(*matches)[*num_matches].match_fields |=
match_table[j].match_field;
(*matches)[*num_matches].device_type |=
match_table[j].type;
(*matches)[*num_matches].num_match_categories++;
break;
}
}
/*
* We should have found a match in the above for loop. If
* not, that means the user entered an invalid device type
* or interface.
*/
if ((*matches)[*num_matches].num_match_categories != (i + 1)) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: unknown match item \"%s\"", __func__,
tstr[i]);
return(-1);
}
}
(*num_matches)++;
return(0);
}
/*
* Compute a number of device statistics. Only one field is mandatory, and
* that is "current". Everything else is optional. The caller passes in
* pointers to variables to hold the various statistics he desires. If he
* doesn't want a particular staistic, he should pass in a NULL pointer.
* Return values:
* 0 -- success
* -1 -- failure
*/
int
compute_stats(struct devstat *current, struct devstat *previous,
long double etime, u_int64_t *total_bytes,
u_int64_t *total_transfers, u_int64_t *total_blocks,
long double *kb_per_transfer, long double *transfers_per_second,
long double *mb_per_second, long double *blocks_per_second,
long double *ms_per_transaction)
{
return(devstat_compute_statistics(current, previous, etime,
total_bytes ? DSM_TOTAL_BYTES : DSM_SKIP,
total_bytes,
total_transfers ? DSM_TOTAL_TRANSFERS : DSM_SKIP,
total_transfers,
total_blocks ? DSM_TOTAL_BLOCKS : DSM_SKIP,
total_blocks,
kb_per_transfer ? DSM_KB_PER_TRANSFER : DSM_SKIP,
kb_per_transfer,
transfers_per_second ? DSM_TRANSFERS_PER_SECOND : DSM_SKIP,
transfers_per_second,
mb_per_second ? DSM_MB_PER_SECOND : DSM_SKIP,
mb_per_second,
blocks_per_second ? DSM_BLOCKS_PER_SECOND : DSM_SKIP,
blocks_per_second,
ms_per_transaction ? DSM_MS_PER_TRANSACTION : DSM_SKIP,
ms_per_transaction,
DSM_NONE));
}
/* This is 1/2^64 */
#define BINTIME_SCALE 5.42101086242752217003726400434970855712890625e-20
long double
devstat_compute_etime(struct bintime *cur_time, struct bintime *prev_time)
{
long double etime;
etime = cur_time->sec;
etime += cur_time->frac * BINTIME_SCALE;
if (prev_time != NULL) {
etime -= prev_time->sec;
etime -= prev_time->frac * BINTIME_SCALE;
}
return(etime);
}
#define DELTA(field, index) \
(current->field[(index)] - (previous ? previous->field[(index)] : 0))
#define DELTA_T(field) \
devstat_compute_etime(&current->field, \
(previous ? &previous->field : NULL))
int
devstat_compute_statistics(struct devstat *current, struct devstat *previous,
long double etime, ...)
{
u_int64_t totalbytes, totalbytesread, totalbyteswrite, totalbytesfree;
u_int64_t totaltransfers, totaltransfersread, totaltransferswrite;
u_int64_t totaltransfersother, totalblocks, totalblocksread;
u_int64_t totalblockswrite, totaltransfersfree, totalblocksfree;
long double totalduration, totaldurationread, totaldurationwrite;
long double totaldurationfree, totaldurationother;
va_list ap;
devstat_metric metric;
u_int64_t *destu64;
long double *destld;
int retval;
retval = 0;
/*
* current is the only mandatory field.
*/
if (current == NULL) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: current stats structure was NULL", __func__);
return(-1);
}
totalbytesread = DELTA(bytes, DEVSTAT_READ);
totalbyteswrite = DELTA(bytes, DEVSTAT_WRITE);
totalbytesfree = DELTA(bytes, DEVSTAT_FREE);
totalbytes = totalbytesread + totalbyteswrite + totalbytesfree;
totaltransfersread = DELTA(operations, DEVSTAT_READ);
totaltransferswrite = DELTA(operations, DEVSTAT_WRITE);
totaltransfersother = DELTA(operations, DEVSTAT_NO_DATA);
totaltransfersfree = DELTA(operations, DEVSTAT_FREE);
totaltransfers = totaltransfersread + totaltransferswrite +
totaltransfersother + totaltransfersfree;
totalblocks = totalbytes;
totalblocksread = totalbytesread;
totalblockswrite = totalbyteswrite;
totalblocksfree = totalbytesfree;
if (current->block_size > 0) {
totalblocks /= current->block_size;
totalblocksread /= current->block_size;
totalblockswrite /= current->block_size;
totalblocksfree /= current->block_size;
} else {
totalblocks /= 512;
totalblocksread /= 512;
totalblockswrite /= 512;
totalblocksfree /= 512;
}
totaldurationread = DELTA_T(duration[DEVSTAT_READ]);
totaldurationwrite = DELTA_T(duration[DEVSTAT_WRITE]);
totaldurationfree = DELTA_T(duration[DEVSTAT_FREE]);
totaldurationother = DELTA_T(duration[DEVSTAT_NO_DATA]);
totalduration = totaldurationread + totaldurationwrite +
totaldurationfree + totaldurationother;
va_start(ap, etime);
while ((metric = (devstat_metric)va_arg(ap, devstat_metric)) != 0) {
if (metric == DSM_NONE)
break;
if (metric >= DSM_MAX) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: metric %d is out of range", __func__,
metric);
retval = -1;
goto bailout;
}
switch (devstat_arg_list[metric].argtype) {
case DEVSTAT_ARG_UINT64:
destu64 = (u_int64_t *)va_arg(ap, u_int64_t *);
break;
case DEVSTAT_ARG_LD:
destld = (long double *)va_arg(ap, long double *);
break;
case DEVSTAT_ARG_SKIP:
destld = (long double *)va_arg(ap, long double *);
break;
default:
retval = -1;
goto bailout;
break; /* NOTREACHED */
}
if (devstat_arg_list[metric].argtype == DEVSTAT_ARG_SKIP)
continue;
switch (metric) {
case DSM_TOTAL_BYTES:
*destu64 = totalbytes;
break;
case DSM_TOTAL_BYTES_READ:
*destu64 = totalbytesread;
break;
case DSM_TOTAL_BYTES_WRITE:
*destu64 = totalbyteswrite;
break;
case DSM_TOTAL_BYTES_FREE:
*destu64 = totalbytesfree;
break;
case DSM_TOTAL_TRANSFERS:
*destu64 = totaltransfers;
break;
case DSM_TOTAL_TRANSFERS_READ:
*destu64 = totaltransfersread;
break;
case DSM_TOTAL_TRANSFERS_WRITE:
*destu64 = totaltransferswrite;
break;
case DSM_TOTAL_TRANSFERS_FREE:
*destu64 = totaltransfersfree;
break;
case DSM_TOTAL_TRANSFERS_OTHER:
*destu64 = totaltransfersother;
break;
case DSM_TOTAL_BLOCKS:
*destu64 = totalblocks;
break;
case DSM_TOTAL_BLOCKS_READ:
*destu64 = totalblocksread;
break;
case DSM_TOTAL_BLOCKS_WRITE:
*destu64 = totalblockswrite;
break;
case DSM_TOTAL_BLOCKS_FREE:
*destu64 = totalblocksfree;
break;
case DSM_KB_PER_TRANSFER:
*destld = totalbytes;
*destld /= 1024;
if (totaltransfers > 0)
*destld /= totaltransfers;
else
*destld = 0.0;
break;
case DSM_KB_PER_TRANSFER_READ:
*destld = totalbytesread;
*destld /= 1024;
if (totaltransfersread > 0)
*destld /= totaltransfersread;
else
*destld = 0.0;
break;
case DSM_KB_PER_TRANSFER_WRITE:
*destld = totalbyteswrite;
*destld /= 1024;
if (totaltransferswrite > 0)
*destld /= totaltransferswrite;
else
*destld = 0.0;
break;
case DSM_KB_PER_TRANSFER_FREE:
*destld = totalbytesfree;
*destld /= 1024;
if (totaltransfersfree > 0)
*destld /= totaltransfersfree;
else
*destld = 0.0;
break;
case DSM_TRANSFERS_PER_SECOND:
if (etime > 0.0) {
*destld = totaltransfers;
*destld /= etime;
} else
*destld = 0.0;
break;
case DSM_TRANSFERS_PER_SECOND_READ:
if (etime > 0.0) {
*destld = totaltransfersread;
*destld /= etime;
} else
*destld = 0.0;
break;
case DSM_TRANSFERS_PER_SECOND_WRITE:
if (etime > 0.0) {
*destld = totaltransferswrite;
*destld /= etime;
} else
*destld = 0.0;
break;
case DSM_TRANSFERS_PER_SECOND_FREE:
if (etime > 0.0) {
*destld = totaltransfersfree;
*destld /= etime;
} else
*destld = 0.0;
break;
case DSM_TRANSFERS_PER_SECOND_OTHER:
if (etime > 0.0) {
*destld = totaltransfersother;
*destld /= etime;
} else
*destld = 0.0;
break;
case DSM_MB_PER_SECOND:
*destld = totalbytes;
*destld /= 1024 * 1024;
if (etime > 0.0)
*destld /= etime;
else
*destld = 0.0;
break;
case DSM_MB_PER_SECOND_READ:
*destld = totalbytesread;
*destld /= 1024 * 1024;
if (etime > 0.0)
*destld /= etime;
else
*destld = 0.0;
break;
case DSM_MB_PER_SECOND_WRITE:
*destld = totalbyteswrite;
*destld /= 1024 * 1024;
if (etime > 0.0)
*destld /= etime;
else
*destld = 0.0;
break;
case DSM_MB_PER_SECOND_FREE:
*destld = totalbytesfree;
*destld /= 1024 * 1024;
if (etime > 0.0)
*destld /= etime;
else
*destld = 0.0;
break;
case DSM_BLOCKS_PER_SECOND:
*destld = totalblocks;
if (etime > 0.0)
*destld /= etime;
else
*destld = 0.0;
break;
case DSM_BLOCKS_PER_SECOND_READ:
*destld = totalblocksread;
if (etime > 0.0)
*destld /= etime;
else
*destld = 0.0;
break;
case DSM_BLOCKS_PER_SECOND_WRITE:
*destld = totalblockswrite;
if (etime > 0.0)
*destld /= etime;
else
*destld = 0.0;
break;
case DSM_BLOCKS_PER_SECOND_FREE:
*destld = totalblocksfree;
if (etime > 0.0)
*destld /= etime;
else
*destld = 0.0;
break;
/*
* Some devstat callers update the duration and some don't.
* So this will only be accurate if they provide the
* duration.
*/
case DSM_MS_PER_TRANSACTION:
if (totaltransfers > 0) {
*destld = totalduration;
*destld /= totaltransfers;
*destld *= 1000;
} else
*destld = 0.0;
break;
case DSM_MS_PER_TRANSACTION_READ:
if (totaltransfersread > 0) {
*destld = totaldurationread;
*destld /= totaltransfersread;
*destld *= 1000;
} else
*destld = 0.0;
break;
case DSM_MS_PER_TRANSACTION_WRITE:
if (totaltransferswrite > 0) {
*destld = totaldurationwrite;
*destld /= totaltransferswrite;
*destld *= 1000;
} else
*destld = 0.0;
break;
case DSM_MS_PER_TRANSACTION_FREE:
if (totaltransfersfree > 0) {
*destld = totaldurationfree;
*destld /= totaltransfersfree;
*destld *= 1000;
} else
*destld = 0.0;
break;
case DSM_MS_PER_TRANSACTION_OTHER:
if (totaltransfersother > 0) {
*destld = totaldurationother;
*destld /= totaltransfersother;
*destld *= 1000;
} else
*destld = 0.0;
break;
case DSM_BUSY_PCT:
*destld = DELTA_T(busy_time);
if (*destld < 0)
*destld = 0;
*destld /= etime;
*destld *= 100;
if (*destld < 0)
*destld = 0;
break;
case DSM_QUEUE_LENGTH:
*destu64 = current->start_count - current->end_count;
break;
case DSM_TOTAL_DURATION:
*destld = totalduration;
break;
case DSM_TOTAL_DURATION_READ:
*destld = totaldurationread;
break;
case DSM_TOTAL_DURATION_WRITE:
*destld = totaldurationwrite;
break;
case DSM_TOTAL_DURATION_FREE:
*destld = totaldurationfree;
break;
case DSM_TOTAL_DURATION_OTHER:
*destld = totaldurationother;
break;
case DSM_TOTAL_BUSY_TIME:
*destld = DELTA_T(busy_time);
break;
/*
* XXX: comment out the default block to see if any case's are missing.
*/
#if 1
default:
/*
* This shouldn't happen, since we should have
* caught any out of range metrics at the top of
* the loop.
*/
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: unknown metric %d", __func__, metric);
retval = -1;
goto bailout;
break; /* NOTREACHED */
#endif
}
}
bailout:
va_end(ap);
return(retval);
}
static int
readkmem(kvm_t *kd, unsigned long addr, void *buf, size_t nbytes)
{
if (kvm_read(kd, addr, buf, nbytes) == -1) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: error reading value (kvm_read): %s", __func__,
kvm_geterr(kd));
return(-1);
}
return(0);
}
static int
readkmem_nl(kvm_t *kd, const char *name, void *buf, size_t nbytes)
{
struct nlist nl[2];
nl[0].n_name = (char *)name;
nl[1].n_name = NULL;
if (kvm_nlist(kd, nl) == -1) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: error getting name list (kvm_nlist): %s",
__func__, kvm_geterr(kd));
return(-1);
}
return(readkmem(kd, nl[0].n_value, buf, nbytes));
}
/*
* This duplicates the functionality of the kernel sysctl handler for poking
* through crash dumps.
*/
static char *
get_devstat_kvm(kvm_t *kd)
{
int i, wp;
long gen;
struct devstat *nds;
struct devstat ds;
struct devstatlist dhead;
int num_devs;
char *rv = NULL;
if ((num_devs = devstat_getnumdevs(kd)) <= 0)
return(NULL);
if (KREADNL(kd, X_DEVICE_STATQ, dhead) == -1)
return(NULL);
nds = STAILQ_FIRST(&dhead);
if ((rv = malloc(sizeof(gen))) == NULL) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: out of memory (initial malloc failed)",
__func__);
return(NULL);
}
gen = devstat_getgeneration(kd);
memcpy(rv, &gen, sizeof(gen));
wp = sizeof(gen);
/*
* Now push out all the devices.
*/
for (i = 0; (nds != NULL) && (i < num_devs);
nds = STAILQ_NEXT(nds, dev_links), i++) {
if (readkmem(kd, (long)nds, &ds, sizeof(ds)) == -1) {
free(rv);
return(NULL);
}
nds = &ds;
rv = (char *)reallocf(rv, sizeof(gen) +
sizeof(ds) * (i + 1));
if (rv == NULL) {
snprintf(devstat_errbuf, sizeof(devstat_errbuf),
"%s: out of memory (malloc failed)",
__func__);
return(NULL);
}
memcpy(rv + wp, &ds, sizeof(ds));
wp += sizeof(ds);
}
return(rv);
}
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