1707d41102
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
96 lines
3.5 KiB
C
96 lines
3.5 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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* 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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* @(#)vm.h 8.2 (Berkeley) 12/13/93
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* $Id: vm.h,v 1.3 1994/08/02 07:55:16 davidg Exp $
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*/
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#ifndef VM_H
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#define VM_H
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typedef char vm_inherit_t; /* XXX: inheritance codes */
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union vm_map_object;
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typedef union vm_map_object vm_map_object_t;
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struct vm_map_entry;
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typedef struct vm_map_entry *vm_map_entry_t;
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struct vm_map;
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typedef struct vm_map *vm_map_t;
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struct vm_object;
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typedef struct vm_object *vm_object_t;
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struct vm_page;
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typedef struct vm_page *vm_page_t;
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struct pager_struct;
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typedef struct pager_struct *vm_pager_t;
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#include <sys/vmmeter.h>
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#include <sys/queue.h>
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#include <machine/cpufunc.h>
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#include <vm/vm_param.h>
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#include <vm/lock.h>
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#include <vm/vm_prot.h>
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#include <vm/vm_inherit.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <vm/pmap.h>
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#include <vm/vm_extern.h>
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/*
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* Shareable process virtual address space.
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* May eventually be merged with vm_map.
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* Several fields are temporary (text, data stuff).
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*/
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struct vmspace {
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struct vm_map vm_map; /* VM address map */
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struct pmap vm_pmap; /* private physical map */
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int vm_refcnt; /* number of references */
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caddr_t vm_shm; /* SYS5 shared memory private data XXX */
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/* we copy from vm_startcopy to the end of the structure on fork */
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#define vm_startcopy vm_rssize
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segsz_t vm_rssize; /* current resident set size in pages */
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segsz_t vm_swrss; /* resident set size before last swap */
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segsz_t vm_tsize; /* text size (pages) XXX */
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segsz_t vm_dsize; /* data size (pages) XXX */
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segsz_t vm_ssize; /* stack size (pages) */
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caddr_t vm_taddr; /* user virtual address of text XXX */
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caddr_t vm_daddr; /* user virtual address of data XXX */
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caddr_t vm_maxsaddr; /* user VA at max stack growth */
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caddr_t vm_minsaddr; /* user VA at max stack growth */
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};
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#endif /* VM_H */
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