9a815ed696
- Keep a freelist of component buffer headers, defaulting to 8 headers per component (tunable with the CCDNBUF kernel compile option). - When allocating a component buffer, try to pull a header off the freelist first, falling back on MALLOC() if the freelist is empty. Use MALLOC() rather than malloc(), because it will attempt to short-cut the allocation before actually making a full-blown malloc() call. - Keep statistics on how many component buffer headers have been allocated and how many of those allocations have resulted in freelist misses. With these changes, I observed measurable decreases in system and wall clock time on operations on an 8G ccd, as well as a measurable drop in the time spent in ccdbuffer() (measured with kernel profiling).
221 lines
8.9 KiB
C
221 lines
8.9 KiB
C
/* $NetBSD: ccdvar.h,v 1.12 1997/01/30 04:00:53 thorpej Exp $ */
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/*-
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* Copyright (c) 1996, 1997 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.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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 REGENTS OR CONTRIBUTORS BE
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* 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) 1988 University of Utah.
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* from: Utah $Hdr: cdvar.h 1.1 90/07/09$
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*
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* @(#)cdvar.h 8.1 (Berkeley) 6/10/93
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*/
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#include <sys/queue.h>
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/*
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* Dynamic configuration and disklabel support by:
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* Jason R. Thorpe <thorpej@nas.nasa.gov>
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* Numerical Aerodynamic Simulation Facility
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* Mail Stop 258-6
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* NASA Ames Research Center
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* Moffett Field, CA 94035
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*/
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/*
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* A concatenated disk is described at initialization time by this structure.
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*/
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struct ccddevice {
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int ccd_unit; /* logical unit of this ccd */
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int ccd_interleave; /* interleave (DEV_BSIZE blocks) */
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int ccd_flags; /* misc. information */
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struct vnode **ccd_vpp; /* array of component vnodes */
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char **ccd_cpp; /* array of component pathnames */
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int ccd_ndev; /* number of component devices */
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};
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/*
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* This structure is used to configure a ccd via ioctl(2).
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*/
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struct ccd_ioctl {
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char **ccio_disks; /* pointer to component paths */
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int ccio_ndisks; /* number of disks to concatenate */
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int ccio_ileave; /* interleave (DEV_BSIZE blocks) */
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int ccio_flags; /* misc. information */
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int ccio_unit; /* unit number: use varies */
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size_t ccio_size; /* (returned) size of ccd */
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};
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/* ccd_flags */
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#define CCDF_SWAP 0x01 /* interleave should be dmmax */
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#define CCDF_UNIFORM 0x02 /* use LCCD of sizes for uniform interleave */
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#define CCDF_MIRROR 0x04 /* enable data mirroring */
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/* Mask of user-settable ccd flags. */
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#define CCDF_USERMASK (CCDF_SWAP|CCDF_UNIFORM|CCDF_MIRROR)
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/*
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* Component info table.
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* Describes a single component of a concatenated disk.
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*/
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struct ccdcinfo {
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struct vnode *ci_vp; /* device's vnode */
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dev_t ci_dev; /* XXX: device's dev_t */
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size_t ci_size; /* size */
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char *ci_path; /* path to component */
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size_t ci_pathlen; /* length of component path */
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};
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/*
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* Interleave description table.
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* Computed at boot time to speed irregular-interleave lookups.
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* The idea is that we interleave in "groups". First we interleave
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* evenly over all component disks up to the size of the smallest
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* component (the first group), then we interleave evenly over all
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* remaining disks up to the size of the next-smallest (second group),
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* and so on.
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*
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* Each table entry describes the interleave characteristics of one
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* of these groups. For example if a concatenated disk consisted of
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* three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
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* DEV_BSIZE (1), the table would have three entries:
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*
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* ndisk startblk startoff dev
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* 3 0 0 0, 1, 2
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* 2 9 3 0, 2
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* 1 13 5 2
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* 0 - - -
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*
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* which says that the first nine blocks (0-8) are interleaved over
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* 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
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* the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
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* at component block 3, and the remaining blocks (13-14) are on disk
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* 2 starting at offset 5.
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*/
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struct ccdiinfo {
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int ii_ndisk; /* # of disks range is interleaved over */
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daddr_t ii_startblk; /* starting scaled block # for range */
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daddr_t ii_startoff; /* starting component offset (block #) */
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int *ii_index; /* ordered list of components in range */
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};
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/*
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* Concatenated disk pseudo-geometry information.
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*/
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struct ccdgeom {
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u_int32_t ccg_secsize; /* # bytes per sector */
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u_int32_t ccg_nsectors; /* # data sectors per track */
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u_int32_t ccg_ntracks; /* # tracks per cylinder */
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u_int32_t ccg_ncylinders; /* # cylinders per unit */
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};
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struct ccdbuf;
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/*
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* A concatenated disk is described after initialization by this structure.
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*/
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struct ccd_softc {
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int sc_unit; /* logical unit number */
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int sc_flags; /* flags */
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int sc_cflags; /* configuration flags */
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size_t sc_size; /* size of ccd */
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int sc_ileave; /* interleave */
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int sc_nccdisks; /* number of components */
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struct ccdcinfo *sc_cinfo; /* component info */
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struct ccdiinfo *sc_itable; /* interleave table */
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struct ccdgeom sc_geom; /* pseudo geometry info */
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char sc_xname[8]; /* XXX external name */
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struct disk sc_dkdev; /* generic disk device info */
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LIST_HEAD(, ccdbuf) sc_freelist; /* component buffer freelist */
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int sc_freecount; /* number of entries */
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int sc_hiwat; /* freelist high water mark */
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/* Statistics */
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u_long sc_nmisses; /* number of freelist misses */
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u_long sc_ngetbuf; /* number of ccdbuf allocs */
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};
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/* sc_flags */
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#define CCDF_INITED 0x01 /* unit has been initialized */
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#define CCDF_WLABEL 0x02 /* label area is writable */
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#define CCDF_LABELLING 0x04 /* unit is currently being labelled */
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#define CCDF_WANTED 0x40 /* someone is waiting to obtain a lock */
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#define CCDF_LOCKED 0x80 /* unit is locked */
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/*
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* Before you can use a unit, it must be configured with CCDIOCSET.
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* The configuration persists across opens and closes of the device;
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* a CCDIOCCLR must be used to reset a configuration. An attempt to
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* CCDIOCSET an already active unit will return EBUSY. Attempts to
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* CCDIOCCLR an inactive unit will return ENXIO.
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*/
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#define CCDIOCSET _IOWR('F', 16, struct ccd_ioctl) /* enable ccd */
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#define CCDIOCCLR _IOW('F', 17, struct ccd_ioctl) /* disable ccd */
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