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much higher filesystem I/O performance, and much better paging performance. It represents the culmination of over 6 months of R&D. The majority of the merged VM/cache work is by John Dyson. The following highlights the most significant changes. Additionally, there are (mostly minor) changes to the various filesystem modules (nfs, msdosfs, etc) to support the new VM/buffer scheme. vfs_bio.c: Significant rewrite of most of vfs_bio to support the merged VM buffer cache scheme. The scheme is almost fully compatible with the old filesystem interface. Significant improvement in the number of opportunities for write clustering. vfs_cluster.c, vfs_subr.c Upgrade and performance enhancements in vfs layer code to support merged VM/buffer cache. Fixup of vfs_cluster to eliminate the bogus pagemove stuff. vm_object.c: Yet more improvements in the collapse code. Elimination of some windows that can cause list corruption. vm_pageout.c: Fixed it, it really works better now. Somehow in 2.0, some "enhancements" broke the code. This code has been reworked from the ground-up. vm_fault.c, vm_page.c, pmap.c, vm_object.c Support for small-block filesystems with merged VM/buffer cache scheme. pmap.c vm_map.c Dynamic kernel VM size, now we dont have to pre-allocate excessive numbers of kernel PTs. vm_glue.c Much simpler and more effective swapping code. No more gratuitous swapping. proc.h Fixed the problem that the p_lock flag was not being cleared on a fork. swap_pager.c, vnode_pager.c Removal of old vfs_bio cruft to support the past pseudo-coherency. Now the code doesn't need it anymore. machdep.c Changes to better support the parameter values for the merged VM/buffer cache scheme. machdep.c, kern_exec.c, vm_glue.c Implemented a seperate submap for temporary exec string space and another one to contain process upages. This eliminates all map fragmentation problems that previously existed. ffs_inode.c, ufs_inode.c, ufs_readwrite.c Changes for merged VM/buffer cache. Add "bypass" support for sneaking in on busy buffers. Submitted by: John Dyson and David Greenman
170 lines
5.6 KiB
C
170 lines
5.6 KiB
C
/*
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* Copyright (c) 1991, 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 Mach Operating System project at Carnegie-Mellon University.
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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: @(#)vm_param.h 8.1 (Berkeley) 6/11/93
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $Id: vm_param.h,v 1.3 1994/08/02 07:55:37 davidg Exp $
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*/
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/*
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* Machine independent virtual memory parameters.
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*/
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#ifndef _VM_PARAM_
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#define _VM_PARAM_
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#include <machine/vmparam.h>
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/*
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* This belongs in types.h, but breaks too many existing programs.
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*/
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typedef int boolean_t;
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#define TRUE 1
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#define FALSE 0
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/*
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* The machine independent pages are refered to as PAGES. A page
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* is some number of hardware pages, depending on the target machine.
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*/
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#define DEFAULT_PAGE_SIZE 4096
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#if 0
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/*
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* All references to the size of a page should be done with PAGE_SIZE
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* or PAGE_SHIFT. The fact they are variables is hidden here so that
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* we can easily make them constant if we so desire.
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*/
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#ifndef PAGE_SIZE
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#define PAGE_SIZE cnt.v_page_size /* size of page */
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#endif
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#ifndef PAGE_MASK
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#define PAGE_MASK page_mask /* size of page - 1 */
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#endif
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#ifndef PAGE_SHIFT
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#define PAGE_SHIFT page_shift /* bits to shift for pages */
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#endif
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#endif
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#ifdef KERNEL
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extern vm_size_t page_mask;
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extern int page_shift;
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#endif
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/*
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* CTL_VM identifiers
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*/
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#define VM_METER 1 /* struct vmmeter */
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#define VM_LOADAVG 2 /* struct loadavg */
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#define VM_V_FREE_MIN 3 /* cnt.v_free_min */
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#define VM_V_FREE_TARGET 4 /* cnt.v_free_target */
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#define VM_V_FREE_RESERVED 5 /* cnt.v_free_reserved */
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#define VM_V_INACTIVE_TARGET 6 /* cnt.v_inactive_target */
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#define VM_V_CACHE_MIN 7 /* cnt.v_cache_max */
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#define VM_V_CACHE_MAX 8 /* cnt.v_cache_min */
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#define VM_V_PAGEOUT_FREE_MIN 9 /* cnt.v_pageout_free_min */
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#define VM_MAXID 10 /* number of valid vm ids */
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#define CTL_VM_NAMES { \
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{ 0, 0 }, \
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{ "vmmeter", CTLTYPE_STRUCT }, \
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{ "loadavg", CTLTYPE_STRUCT }, \
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{ "v_free_min", CTLTYPE_INT }, \
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{ "v_free_target", CTLTYPE_INT }, \
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{ "v_free_reserved", CTLTYPE_INT }, \
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{ "v_inactive_target", CTLTYPE_INT }, \
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{ "v_cache_min", CTLTYPE_INT }, \
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{ "v_cache_max", CTLTYPE_INT }, \
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{ "v_pageout_free_min", CTLTYPE_INT}, \
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}
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/*
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* Return values from the VM routines.
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*/
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#define KERN_SUCCESS 0
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#define KERN_INVALID_ADDRESS 1
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#define KERN_PROTECTION_FAILURE 2
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#define KERN_NO_SPACE 3
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#define KERN_INVALID_ARGUMENT 4
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#define KERN_FAILURE 5
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#define KERN_RESOURCE_SHORTAGE 6
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#define KERN_NOT_RECEIVER 7
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#define KERN_NO_ACCESS 8
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#ifndef ASSEMBLER
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/*
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* Convert addresses to pages and vice versa.
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* No rounding is used.
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*/
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#ifdef KERNEL
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#define num_pages(x) \
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((vm_offset_t)((((vm_offset_t)(x)) + PAGE_MASK) >> PAGE_SHIFT))
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extern vm_size_t mem_size; /* size of physical memory (bytes) */
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extern vm_offset_t first_addr; /* first physical page */
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extern vm_offset_t last_addr; /* last physical page */
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#endif /* KERNEL */
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#endif /* ASSEMBLER */
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#endif /* _VM_PARAM_ */
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