xref: /illumos-gate/usr/src/uts/common/sys/vmsystm.h (revision 338664df)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
27 /*	  All Rights Reserved	*/
28 
29 /*
30  * University Copyright- Copyright (c) 1982, 1986, 1988
31  * The Regents of the University of California
32  * All Rights Reserved
33  *
34  * University Acknowledgment- Portions of this document are derived from
35  * software developed by the University of California, Berkeley, and its
36  * contributors.
37  */
38 
39 #ifndef _SYS_VMSYSTM_H
40 #define	_SYS_VMSYSTM_H
41 
42 #include <sys/proc.h>
43 
44 #ifdef	__cplusplus
45 extern "C" {
46 #endif
47 
48 /*
49  * Miscellaneous virtual memory subsystem variables and structures.
50  */
51 #ifdef _KERNEL
52 extern pgcnt_t	freemem;	/* remaining blocks of free memory */
53 extern pgcnt_t	avefree;	/* 5 sec moving average of free memory */
54 extern pgcnt_t	avefree30;	/* 30 sec moving average of free memory */
55 extern pgcnt_t	deficit;	/* estimate of needs of new swapped in procs */
56 extern pgcnt_t	nscan;		/* number of scans in last second */
57 extern pgcnt_t	desscan;	/* desired pages scanned per second */
58 extern pgcnt_t	slowscan;
59 extern pgcnt_t	fastscan;
60 extern pgcnt_t	pushes;		/* number of pages pushed to swap device */
61 extern uint64_t	low_mem_scan;	/* num times page scan due to low memory */
62 extern volatile uint64_t n_throttle; /* num times page create throttled */
63 
64 /* writable copies of tunables */
65 extern pgcnt_t	maxpgio;	/* max paging i/o per sec before start swaps */
66 extern pgcnt_t	lotsfree;	/* max free before clock freezes */
67 extern pgcnt_t	desfree;	/* minimum free pages before swapping begins */
68 extern pgcnt_t	minfree;	/* no of pages to try to keep free via daemon */
69 extern pgcnt_t	needfree;	/* no of pages currently being waited for */
70 extern pgcnt_t	throttlefree;	/* point at which we block PG_WAIT calls */
71 extern pgcnt_t	pageout_reserve; /* point at which we deny non-PG_WAIT calls */
72 extern pgcnt_t	pages_before_pager; /* XXX */
73 
74 /*
75  * TRUE if the pageout daemon, fsflush daemon, or the scheduler.  These threads
76  * can't sleep while trying to free up memory since a deadlock will occur if
77  * they do sleep.
78  */
79 #define	NOMEMWAIT() (ttoproc(curthread) == proc_pageout || \
80 			ttoproc(curthread) == proc_fsflush || \
81 			ttoproc(curthread) == proc_sched || \
82 			(curthread->t_flag & T_PUSHPAGE) != 0)
83 
84 /* insure non-zero */
85 #define	nz(x)	((x) != 0 ? (x) : 1)
86 
87 /*
88  * Flags passed by the swapper to swapout routines of each
89  * scheduling class.
90  */
91 #define	HARDSWAP	1
92 #define	SOFTSWAP	2
93 
94 /*
95  * Values returned by valid_usr_range()
96  */
97 #define	RANGE_OKAY	(0)
98 #define	RANGE_BADADDR	(1)
99 #define	RANGE_BADPROT	(2)
100 
101 /*
102  * map_pgsz: temporary - subject to change.
103  */
104 #define	MAPPGSZ_VA	0x01
105 #define	MAPPGSZ_STK	0x02
106 #define	MAPPGSZ_HEAP	0x04
107 #define	MAPPGSZ_ISM	0x08
108 
109 /*
110  * Flags for map_pgszcvec
111  */
112 #define	MAPPGSZC_SHM	0x01
113 #define	MAPPGSZC_PRIVM	0x02
114 #define	MAPPGSZC_STACK	0x04
115 #define	MAPPGSZC_HEAP	0x08
116 
117 /*
118  * vacalign values for choose_addr
119  */
120 #define	ADDR_NOVACALIGN	0
121 #define	ADDR_VACALIGN	1
122 
123 struct as;
124 struct page;
125 struct anon;
126 
127 extern int maxslp;
128 extern ulong_t pginrate;
129 extern ulong_t pgoutrate;
130 extern void swapout_lwp(klwp_t *);
131 
132 extern	int valid_va_range(caddr_t *basep, size_t *lenp, size_t minlen,
133 		int dir);
134 extern	int valid_va_range_aligned(caddr_t *basep, size_t *lenp,
135     size_t minlen, int dir, size_t align, size_t redzone, size_t off);
136 
137 extern	int valid_usr_range(caddr_t, size_t, uint_t, struct as *, caddr_t);
138 extern	int useracc(void *, size_t, int);
139 extern	size_t map_pgsz(int maptype, struct proc *p, caddr_t addr, size_t len,
140     int memcntl);
141 extern	uint_t map_pgszcvec(caddr_t addr, size_t size, uintptr_t off, int flags,
142     int type, int memcntl);
143 extern int choose_addr(struct as *as, caddr_t *addrp, size_t len, offset_t off,
144     int vacalign, uint_t flags);
145 extern	void map_addr(caddr_t *addrp, size_t len, offset_t off, int vacalign,
146     uint_t flags);
147 extern	int map_addr_vacalign_check(caddr_t, u_offset_t);
148 extern	void map_addr_proc(caddr_t *addrp, size_t len, offset_t off,
149     int vacalign, caddr_t userlimit, struct proc *p, uint_t flags);
150 extern	void vmmeter(void);
151 extern	int cow_mapin(struct as *, caddr_t, caddr_t, struct page **,
152 	struct anon **, size_t *, int);
153 
154 extern	caddr_t	ppmapin(struct page *, uint_t, caddr_t);
155 extern	void	ppmapout(caddr_t);
156 
157 extern	int pf_is_memory(pfn_t);
158 
159 extern	void	dcache_flushall(void);
160 
161 extern	void	*boot_virt_alloc(void *addr, size_t size);
162 
163 extern	size_t	exec_get_spslew(void);
164 
165 #endif	/* _KERNEL */
166 
167 #ifdef	__cplusplus
168 }
169 #endif
170 
171 #endif	/* _SYS_VMSYSTM_H */
172