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Functions to support io statistics collection.

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blymn 2006-04-14 13:17:20 +00:00
parent 906131e6f3
commit eb5227b874
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sys/kern/subr_iostat.c Normal file
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/* $NetBSD: subr_iostat.c,v 1.1 2006/04/14 13:17:20 blymn Exp $ */
/* NetBSD: subr_disk.c,v 1.69 2005/05/29 22:24:15 christos Exp */
/*-
* Copyright (c) 1996, 1997, 1999, 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Copyright (c) 1982, 1986, 1988, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* 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. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_iostat.c,v 1.1 2006/04/14 13:17:20 blymn Exp $");
#include "opt_compat_netbsd.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/syslog.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
#include <sys/sysctl.h>
#include <lib/libkern/libkern.h>
/*
* Function prototypes for sysctl nodes
*/
static int sysctl_hw_disknames(SYSCTLFN_PROTO);
static int sysctl_hw_iostatnames(SYSCTLFN_PROTO);
static int sysctl_hw_iostats(SYSCTLFN_PROTO);
static int
iostati_getnames(int disk_only, char *oldp, size_t *oldlenp, const void *newp,
u_int namelen);
/*
* A global list of all drives attached to the system. May grow or
* shrink over time.
*/
struct iostatlist_head iostatlist = TAILQ_HEAD_INITIALIZER(iostatlist);
int iostat_count; /* number of drives in global drivelist */
struct simplelock iostatlist_slock = SIMPLELOCK_INITIALIZER;
/*
* Searches the iostatlist for the iostat corresponding to the
* name provided.
*/
struct io_stats *
iostat_find(char *name)
{
struct io_stats *iostatp;
if ((name == NULL) || (iostat_count <= 0))
return (NULL);
simple_lock(&iostatlist_slock);
for (iostatp = TAILQ_FIRST(&iostatlist); iostatp != NULL;
iostatp = TAILQ_NEXT(iostatp, link))
if (strcmp(iostatp->name, name) == 0) {
simple_unlock(&iostatlist_slock);
return (iostatp);
}
simple_unlock(&iostatlist_slock);
return (NULL);
}
/*
* Allocate and initialise memory for the i/o statistics.
*/
struct
io_stats *iostat_alloc(int32_t type)
{
int s;
struct io_stats *stats;
stats = malloc(sizeof(struct io_stats), M_DEVBUF, M_NOWAIT);
if (stats == NULL)
panic("iostat_alloc: cannot allocate memory for stats "
"buffer");
stats->type = type;
stats->rxfer = 0;
stats->rbytes = 0;
stats->wxfer = 0;
stats->wbytes = 0;
/*
* Set the attached timestamp.
*/
s = splclock();
stats->attachtime = mono_time;
splx(s);
timerclear(&stats->time);
timerclear(&stats->timestamp);
/*
* Link into the drivelist.
*/
simple_lock(&iostatlist_slock);
TAILQ_INSERT_TAIL(&iostatlist, stats, link);
iostat_count++;
simple_unlock(&iostatlist_slock);
return stats;
}
/*
* Remove i/o from stats collection.
*/
void
iostat_free(struct io_stats *stats)
{
/*
* Remove from the iostat list.
*/
if (iostat_count == 0)
panic("iostat_free: iostat_count == 0");
simple_lock(&iostatlist_slock);
TAILQ_REMOVE(&iostatlist, stats, link);
iostat_count--;
simple_unlock(&iostatlist_slock);
free(stats, M_DEVBUF);
}
/*
* Increment a iostat busy counter. If the counter is going from
* 0 to 1, set the timestamp.
*/
void
iostat_busy(struct io_stats *stats)
{
int s;
/*
* XXX We'd like to use something as accurate as microtime(),
* but that doesn't depend on the system TOD clock.
*/
if (stats->busy++ == 0) {
s = splclock();
stats->timestamp = mono_time;
splx(s);
}
}
/*
* Decrement a iostat busy counter, increment the byte count, total busy
* time, and reset the timestamp.
*/
void
iostat_unbusy(struct io_stats *stats, long bcount, int read)
{
int s;
struct timeval dv_time, diff_time;
if (stats->busy-- == 0) {
printf("%s: busy < 0\n", stats->name);
panic("iostat_unbusy");
}
s = splclock();
dv_time = mono_time;
splx(s);
timersub(&dv_time, &stats->timestamp, &diff_time);
timeradd(&stats->time, &diff_time, &stats->time);
stats->timestamp = dv_time;
if (bcount > 0) {
if (read) {
stats->rbytes += bcount;
stats->rxfer++;
} else {
stats->wbytes += bcount;
stats->wxfer++;
}
}
}
/*
* Increment the seek counter. This does look almost redundant but it
* abstracts the stats gathering.
*/
void
iostat_seek(struct io_stats *stats)
{
stats->seek++;
}
static int
sysctl_hw_disknames(SYSCTLFN_ARGS)
{
return iostati_getnames(1, oldp, oldlenp, newp, namelen);
}
static int
sysctl_hw_iostatnames(SYSCTLFN_ARGS)
{
return iostati_getnames(0, oldp, oldlenp, newp, namelen);
}
static int
iostati_getnames(int disk_only, char *oldp, size_t *oldlenp, const void *newp,
u_int namelen)
{
char bf[IOSTATNAMELEN + 1];
char *where = oldp;
struct io_stats *stats;
size_t needed, left, slen;
int error, first;
if (newp != NULL)
return (EPERM);
if (namelen != 0)
return (EINVAL);
first = 1;
error = 0;
needed = 0;
left = *oldlenp;
simple_lock(&iostatlist_slock);
for (stats = TAILQ_FIRST(&iostatlist); stats != NULL;
stats = TAILQ_NEXT(stats, link)) {
if ((disk_only == 1) && (stats->type != IOSTAT_DISK))
continue;
if (where == NULL)
needed += strlen(stats->name) + 1;
else {
memset(bf, 0, sizeof(bf));
if (first) {
strncpy(bf, stats->name, sizeof(bf));
first = 0;
} else {
bf[0] = ' ';
strncpy(bf + 1, stats->name,
sizeof(bf) - 1);
}
bf[IOSTATNAMELEN] = '\0';
slen = strlen(bf);
if (left < slen + 1)
break;
/* +1 to copy out the trailing NUL byte */
error = copyout(bf, where, slen + 1);
if (error)
break;
where += slen;
needed += slen;
left -= slen;
}
}
simple_unlock(&iostatlist_slock);
*oldlenp = needed;
return (error);
}
static int
sysctl_hw_iostats(SYSCTLFN_ARGS)
{
struct io_sysctl sdrive;
struct io_stats *stats;
char *where = oldp;
size_t tocopy, left;
int error;
if (newp != NULL)
return (EPERM);
/*
* The original hw.diskstats call was broken and did not require
* the userland to pass in it's size of struct disk_sysctl. This
* was fixed after NetBSD 1.6 was released, and any applications
* that do not pass in the size are given an error only, unless
* we care about 1.6 compatibility.
*/
if (namelen == 0)
#ifdef COMPAT_16
tocopy = offsetof(struct io_sysctl, busy);
#else
return (EINVAL);
#endif
else
tocopy = name[0];
if (where == NULL) {
*oldlenp = iostat_count * tocopy;
return (0);
}
error = 0;
left = *oldlenp;
memset(&sdrive, 0, sizeof(sdrive));
*oldlenp = 0;
simple_lock(&iostatlist_slock);
TAILQ_FOREACH(stats, &iostatlist, link) {
if (left < tocopy)
break;
strncpy(sdrive.name, stats->name, sizeof(sdrive.name));
sdrive.xfer = stats->rxfer + stats->wxfer;
sdrive.rxfer = stats->rxfer;
sdrive.wxfer = stats->wxfer;
sdrive.seek = stats->seek;
sdrive.bytes = stats->rbytes + stats->wbytes;
sdrive.rbytes = stats->rbytes;
sdrive.wbytes = stats->wbytes;
sdrive.attachtime_sec = stats->attachtime.tv_sec;
sdrive.attachtime_usec = stats->attachtime.tv_usec;
sdrive.timestamp_sec = stats->timestamp.tv_sec;
sdrive.timestamp_usec = stats->timestamp.tv_usec;
sdrive.time_sec = stats->time.tv_sec;
sdrive.time_usec = stats->time.tv_usec;
sdrive.busy = stats->busy;
error = copyout(&sdrive, where, min(tocopy, sizeof(sdrive)));
if (error)
break;
where += tocopy;
*oldlenp += tocopy;
left -= tocopy;
}
simple_unlock(&iostatlist_slock);
return (error);
}
SYSCTL_SETUP(sysctl_io_stats_setup, "sysctl i/o stats setup")
{
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRING, "disknames",
SYSCTL_DESCR("List of disk drives present"),
sysctl_hw_disknames, 0, NULL, 0,
CTL_HW, HW_DISKNAMES, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRING, "iostatnames",
SYSCTL_DESCR("I/O stats are being collected for these"
" devices"),
sysctl_hw_iostatnames, 0, NULL, 0,
CTL_HW, HW_IOSTATNAMES, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "drivestats",
SYSCTL_DESCR("Statistics on device I/O operations"),
sysctl_hw_iostats, 0, NULL, 0,
CTL_HW, HW_IOSTATS, CTL_EOL);
}