412 lines
11 KiB
C
412 lines
11 KiB
C
/* $NetBSD: subr_iostat.c,v 1.19 2009/11/30 11:28:35 pooka Exp $ */
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/* NetBSD: subr_disk.c,v 1.69 2005/05/29 22:24:15 christos Exp */
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/*-
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* Copyright (c) 1996, 1997, 1999, 2000, 2009 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1982, 1986, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: subr_iostat.c,v 1.19 2009/11/30 11:28:35 pooka Exp $");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/kmem.h>
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#include <sys/iostat.h>
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#include <sys/sysctl.h>
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#include <sys/rwlock.h>
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/*
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* Function prototypes for sysctl nodes
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*/
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static int sysctl_hw_disknames(SYSCTLFN_PROTO);
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static int sysctl_hw_iostatnames(SYSCTLFN_PROTO);
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static int sysctl_hw_iostats(SYSCTLFN_PROTO);
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static int
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iostati_getnames(int disk_only, char *oldp, size_t *oldlenp, const void *newp,
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u_int namelen);
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/*
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* A global list of all drives attached to the system. May grow or
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* shrink over time.
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*/
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struct iostatlist_head iostatlist = TAILQ_HEAD_INITIALIZER(iostatlist);
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int iostat_count; /* number of drives in global drivelist */
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krwlock_t iostatlist_lock;
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static void sysctl_io_stats_setup(struct sysctllog **);
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/*
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* Initialise the iostat subsystem.
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*/
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void
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iostat_init(void)
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{
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rw_init(&iostatlist_lock);
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sysctl_io_stats_setup(NULL);
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}
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/*
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* Searches the iostatlist for the iostat corresponding to the
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* name provided.
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*/
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struct io_stats *
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iostat_find(const char *name)
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{
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struct io_stats *iostatp;
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KASSERT(name != NULL);
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rw_enter(&iostatlist_lock, RW_READER);
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TAILQ_FOREACH(iostatp, &iostatlist, io_link) {
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if (strcmp(iostatp->io_name, name) == 0) {
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break;
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}
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}
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rw_exit(&iostatlist_lock);
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return iostatp;
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}
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/*
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* Allocate and initialise memory for the i/o statistics.
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*/
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struct io_stats *
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iostat_alloc(int32_t type, void *parent, const char *name)
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{
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struct io_stats *stats;
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stats = kmem_zalloc(sizeof(*stats), KM_SLEEP);
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if (stats == NULL)
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panic("iostat_alloc: cannot allocate memory for stats buffer");
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stats->io_type = type;
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stats->io_parent = parent;
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(void)strlcpy(stats->io_name, name, sizeof(stats->io_name));
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/*
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* Set the attached timestamp.
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*/
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getmicrouptime(&stats->io_attachtime);
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/*
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* Link into the drivelist.
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*/
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rw_enter(&iostatlist_lock, RW_WRITER);
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TAILQ_INSERT_TAIL(&iostatlist, stats, io_link);
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iostat_count++;
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rw_exit(&iostatlist_lock);
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return stats;
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}
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/*
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* Remove i/o from stats collection.
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*/
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void
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iostat_free(struct io_stats *stats)
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{
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/*
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* Remove from the iostat list.
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*/
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if (iostat_count == 0)
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panic("iostat_free: iostat_count == 0");
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rw_enter(&iostatlist_lock, RW_WRITER);
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TAILQ_REMOVE(&iostatlist, stats, io_link);
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iostat_count--;
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rw_exit(&iostatlist_lock);
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kmem_free(stats, sizeof(*stats));
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}
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/*
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* Increment a iostat busy counter. If the counter is going from
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* 0 to 1, set the timestamp.
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*/
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void
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iostat_busy(struct io_stats *stats)
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{
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if (stats->io_busy++ == 0)
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getmicrouptime(&stats->io_timestamp);
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}
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/*
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* Decrement a iostat busy counter, increment the byte count, total busy
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* time, and reset the timestamp.
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*/
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void
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iostat_unbusy(struct io_stats *stats, long bcount, int read)
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{
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struct timeval dv_time, diff_time;
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if (stats->io_busy-- == 0) {
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printf("%s: busy < 0\n", stats->io_name);
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panic("iostat_unbusy");
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}
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getmicrouptime(&dv_time);
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timersub(&dv_time, &stats->io_timestamp, &diff_time);
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timeradd(&stats->io_time, &diff_time, &stats->io_time);
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stats->io_timestamp = dv_time;
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if (bcount > 0) {
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if (read) {
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stats->io_rbytes += bcount;
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stats->io_rxfer++;
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} else {
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stats->io_wbytes += bcount;
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stats->io_wxfer++;
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}
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}
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}
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/*
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* Return non-zero if a device has an I/O request in flight.
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*/
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bool
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iostat_isbusy(struct io_stats *stats)
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{
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return stats->io_busy != 0;
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}
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/*
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* Increment the seek counter. This does look almost redundant but it
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* abstracts the stats gathering.
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*/
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void
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iostat_seek(struct io_stats *stats)
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{
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stats->io_seek++;
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}
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static int
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sysctl_hw_disknames(SYSCTLFN_ARGS)
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{
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return iostati_getnames(1, oldp, oldlenp, newp, namelen);
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}
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static int
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sysctl_hw_iostatnames(SYSCTLFN_ARGS)
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{
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return iostati_getnames(0, oldp, oldlenp, newp, namelen);
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}
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static int
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iostati_getnames(int disk_only, char *oldp, size_t *oldlenp, const void *newp,
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u_int namelen)
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{
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char bf[IOSTATNAMELEN + 1];
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char *where = oldp;
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struct io_stats *stats;
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size_t needed, left, slen;
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int error, first;
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if (newp != NULL)
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return (EPERM);
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if (namelen != 0)
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return (EINVAL);
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first = 1;
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error = 0;
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needed = 0;
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left = *oldlenp;
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rw_enter(&iostatlist_lock, RW_READER);
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for (stats = TAILQ_FIRST(&iostatlist); stats != NULL;
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stats = TAILQ_NEXT(stats, io_link)) {
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if ((disk_only == 1) && (stats->io_type != IOSTAT_DISK))
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continue;
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if (where == NULL)
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needed += strlen(stats->io_name) + 1;
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else {
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memset(bf, 0, sizeof(bf));
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if (first) {
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strncpy(bf, stats->io_name, sizeof(bf));
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first = 0;
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} else {
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bf[0] = ' ';
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strncpy(bf + 1, stats->io_name,
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sizeof(bf) - 1);
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}
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bf[IOSTATNAMELEN] = '\0';
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slen = strlen(bf);
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if (left < slen + 1)
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break;
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/* +1 to copy out the trailing NUL byte */
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error = copyout(bf, where, slen + 1);
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if (error)
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break;
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where += slen;
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needed += slen;
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left -= slen;
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}
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}
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rw_exit(&iostatlist_lock);
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*oldlenp = needed;
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return (error);
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}
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static int
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sysctl_hw_iostats(SYSCTLFN_ARGS)
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{
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struct io_sysctl sdrive;
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struct io_stats *stats;
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char *where = oldp;
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size_t tocopy, left;
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int error;
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if (newp != NULL)
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return (EPERM);
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/*
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* The original hw.diskstats call was broken and did not require
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* the userland to pass in it's size of struct disk_sysctl. This
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* was fixed after NetBSD 1.6 was released.
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*/
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if (namelen == 0)
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tocopy = offsetof(struct io_sysctl, busy);
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else
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tocopy = name[0];
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if (where == NULL) {
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*oldlenp = iostat_count * tocopy;
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return (0);
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}
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error = 0;
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left = *oldlenp;
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memset(&sdrive, 0, sizeof(sdrive));
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*oldlenp = 0;
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rw_enter(&iostatlist_lock, RW_READER);
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TAILQ_FOREACH(stats, &iostatlist, io_link) {
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if (left < tocopy)
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break;
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strncpy(sdrive.name, stats->io_name, sizeof(sdrive.name));
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sdrive.xfer = stats->io_rxfer + stats->io_wxfer;
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sdrive.rxfer = stats->io_rxfer;
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sdrive.wxfer = stats->io_wxfer;
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sdrive.seek = stats->io_seek;
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sdrive.bytes = stats->io_rbytes + stats->io_wbytes;
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sdrive.rbytes = stats->io_rbytes;
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sdrive.wbytes = stats->io_wbytes;
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sdrive.attachtime_sec = stats->io_attachtime.tv_sec;
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sdrive.attachtime_usec = stats->io_attachtime.tv_usec;
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sdrive.timestamp_sec = stats->io_timestamp.tv_sec;
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sdrive.timestamp_usec = stats->io_timestamp.tv_usec;
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sdrive.time_sec = stats->io_time.tv_sec;
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sdrive.time_usec = stats->io_time.tv_usec;
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sdrive.busy = stats->io_busy;
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error = copyout(&sdrive, where, min(tocopy, sizeof(sdrive)));
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if (error)
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break;
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where += tocopy;
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*oldlenp += tocopy;
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left -= tocopy;
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}
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rw_exit(&iostatlist_lock);
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return (error);
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}
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static void
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sysctl_io_stats_setup(struct sysctllog **clog)
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{
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "hw", NULL,
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NULL, 0, NULL, 0,
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CTL_HW, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_STRING, "disknames",
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SYSCTL_DESCR("List of disk drives present"),
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sysctl_hw_disknames, 0, NULL, 0,
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CTL_HW, HW_DISKNAMES, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_STRING, "iostatnames",
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SYSCTL_DESCR("I/O stats are being collected for these"
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" devices"),
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sysctl_hw_iostatnames, 0, NULL, 0,
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CTL_HW, HW_IOSTATNAMES, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_STRUCT, "iostats",
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SYSCTL_DESCR("Statistics on device I/O operations"),
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sysctl_hw_iostats, 0, NULL, 0,
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CTL_HW, HW_IOSTATS, CTL_EOL);
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}
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