04f1835605
Eliminates vm_fault overhead on process startup and mmap referenced data for in-memory pages. (process startup time using in-memory segments *much* faster) 2) Even more efficient pmap code. Code partially cleaned up. More comments yet to follow. (generally more efficient pte management) 3) Pageout clustering ( in addition to the FreeBSD V1.1 pagein clustering.) (much faster paging performance on non-write behind disk subsystems, slightly faster performance on other systems.) 4) Slightly changed vm_pageout code for more efficiency and better statistics. Also, resist swapout a little more. (less likely to pageout a recently used page) 5) Slight improvement to the page table page trap efficiency. (generally faster system VM fault performance) 6) Defer creation of unnamed anonymous regions pager until needed. (speeds up shared memory bss creation) 7) Remove possible deadlock from swap_pager initialization. 8) Enhanced procfs to provide "vminfo" about vm objects and user pmaps. 9) Increased MCLSHIFT/MCLBYTES from 2K to 4K to improve net & socket performance and to prepare for things to come. John Dyson dyson@implode.root.com David Greenman davidg@root.com
126 lines
4.3 KiB
C
126 lines
4.3 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* 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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* William Jolitz.
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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: @(#)pte.h 5.5 (Berkeley) 5/9/91
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* $Id: pte.h,v 1.4 1994/01/31 06:52:41 davidg Exp $
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*/
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#ifndef _MACHINE_PTE_H_
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#define _MACHINE_PTE_H_ 1
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/*
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* 386 page table entry and page table directory
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* W.Jolitz, 8/89
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*
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* There are two major kinds of pte's: those which have ever existed (and are
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* thus either now in core or on the swap device), and those which have
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* never existed, but which will be filled on demand at first reference.
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* There is a structure describing each. There is also an ancillary
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* structure used in page clustering.
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*/
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#ifndef LOCORE
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struct pde {
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unsigned int
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pd_v:1, /* valid bit */
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pd_prot:2, /* access control */
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pd_ncpwt:1, /* page cache write through */
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pd_ncpcd:1, /* page cache disable */
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pd_u:1, /* hardware maintained 'used' bit */
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pd_m:1, /* not used */
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pd_mbz2:2, /* reserved, must be zero */
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:3, /* reserved for software */
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pd_pfnum:20; /* physical page frame number of pte's*/
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};
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struct pte {
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unsigned int
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pg_v:1, /* valid bit */
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pg_prot:2, /* access control */
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pg_ncpwt:1, /* page cache write through */
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pg_ncpcd:1, /* page cache disable */
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pg_u:1, /* hardware maintained 'used' bit */
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pg_m:1, /* hardware maintained modified bit */
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pg_mbz2:2, /* reserved, must be zero */
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:3, /* (unused) */
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pg_pfnum:20; /* physical page frame number */
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};
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#endif
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#define PD_MASK 0xffc00000 /* page directory address bits */
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#define PD_SHIFT 22 /* page directory address bits */
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#define PG_V 0x00000001
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#define PG_PROT 0x00000006 /* all protection bits . */
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#define PG_NC_PWT 0x00000008 /* page cache write through */
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#define PG_NC_PCD 0x00000010 /* page cache disable */
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#define PG_N 0x00000018 /* Non-cacheable */
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#define PG_U 0x00000020 /* page was accessed */
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#define PG_M 0x00000040 /* page was modified */
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#define PG_FRAME 0xfffff000
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#define PG_NOACC 0
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#define PG_KR 0x00000000
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#define PG_KW 0x00000002
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#define PG_URKR 0x00000004
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#define PG_URKW 0x00000004
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#define PG_UW 0x00000006
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#define PG_FZERO 0
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#define PG_FTEXT 1
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#define PG_FMAX (PG_FTEXT)
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/*
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* Page Protection Exception bits
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*/
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#define PGEX_P 0x01 /* Protection violation vs. not present */
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#define PGEX_W 0x02 /* during a Write cycle */
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#define PGEX_U 0x04 /* access from User mode (UPL) */
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/*
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* Pte related macros
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*/
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#define dirty(pte) ((pte) & PG_M)
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#ifndef LOCORE
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#ifdef KERNEL
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/* utilities defined in pmap.c */
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extern struct pte *Sysmap;
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#endif
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#endif
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#endif /* _MACHINE_PTE_H_ */
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