aboutsummaryrefslogtreecommitdiff
path: root/sys/sys/vmmeter.h
blob: bc536f71e7b58a3d71e5821bc5085bc5e55283b4 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
/*-
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)vmmeter.h	8.2 (Berkeley) 7/10/94
 * $FreeBSD$
 */

#ifndef _SYS_VMMETER_H_
#define _SYS_VMMETER_H_

/*
 * This value is used by ps(1) to change sleep state flag from 'S' to
 * 'I' and by the sched process to set the alarm clock.
 */
#define	MAXSLP			20

/* Systemwide totals computed every five seconds. */
struct vmtotal {
	int16_t	t_rq;		/* length of the run queue */
	int16_t	t_dw;		/* jobs in ``disk wait'' (neg priority) */
	int16_t	t_pw;		/* jobs in page wait */
	int16_t	t_sl;		/* jobs sleeping in core */
	int16_t	t_sw;		/* swapped out runnable/short block jobs */
	int32_t	t_vm;		/* total virtual memory */
	int32_t	t_avm;		/* active virtual memory */
	int32_t	t_rm;		/* total real memory in use */
	int32_t	t_arm;		/* active real memory */
	int32_t	t_vmshr;	/* shared virtual memory */
	int32_t	t_avmshr;	/* active shared virtual memory */
	int32_t	t_rmshr;	/* shared real memory */
	int32_t	t_armshr;	/* active shared real memory */
	int32_t	t_free;		/* free memory pages */
};

#if defined(_KERNEL) || defined(_WANT_VMMETER)
#include <sys/counter.h>

#ifdef _KERNEL
#define VMMETER_ALIGNED	__aligned(CACHE_LINE_SIZE)
#else
#define VMMETER_ALIGNED
#endif

/*
 * System wide statistics counters.
 * Locking:
 *      a - locked by atomic operations
 *      c - constant after initialization
 *      f - locked by vm_page_queue_free_mtx
 *      p - uses counter(9)
 *      q - changes are synchronized by the corresponding vm_pagequeue lock
 */
struct vmmeter {
	/*
	 * General system activity.
	 */
	counter_u64_t v_swtch;		/* (p) context switches */
	counter_u64_t v_trap;		/* (p) calls to trap */
	counter_u64_t v_syscall;	/* (p) calls to syscall() */
	counter_u64_t v_intr;		/* (p) device interrupts */
	counter_u64_t v_soft;		/* (p) software interrupts */
	/*
	 * Virtual memory activity.
	 */
	counter_u64_t v_vm_faults;	/* (p) address memory faults */
	counter_u64_t v_io_faults;	/* (p) page faults requiring I/O */
	counter_u64_t v_cow_faults;	/* (p) copy-on-writes faults */
	counter_u64_t v_cow_optim;	/* (p) optimized COW faults */
	counter_u64_t v_zfod;		/* (p) pages zero filled on demand */
	counter_u64_t v_ozfod;		/* (p) optimized zero fill pages */
	counter_u64_t v_swapin;		/* (p) swap pager pageins */
	counter_u64_t v_swapout;	/* (p) swap pager pageouts */
	counter_u64_t v_swappgsin;	/* (p) swap pager pages paged in */
	counter_u64_t v_swappgsout;	/* (p) swap pager pages paged out */
	counter_u64_t v_vnodein;	/* (p) vnode pager pageins */
	counter_u64_t v_vnodeout;	/* (p) vnode pager pageouts */
	counter_u64_t v_vnodepgsin;	/* (p) vnode_pager pages paged in */
	counter_u64_t v_vnodepgsout;	/* (p) vnode pager pages paged out */
	counter_u64_t v_intrans;	/* (p) intransit blocking page faults */
	counter_u64_t v_reactivated;	/* (p) reactivated by the pagedaemon */
	counter_u64_t v_pdwakeups;	/* (p) times daemon has awaken */
	counter_u64_t v_pdpages;	/* (p) pages analyzed by daemon */
	counter_u64_t v_pdshortfalls;	/* (p) page reclamation shortfalls */

	counter_u64_t v_dfree;		/* (p) pages freed by daemon */
	counter_u64_t v_pfree;		/* (p) pages freed by processes */
	counter_u64_t v_tfree;		/* (p) total pages freed */
	/*
	 * Fork/vfork/rfork activity.
	 */
	counter_u64_t v_forks;		/* (p) fork() calls */
	counter_u64_t v_vforks;		/* (p) vfork() calls */
	counter_u64_t v_rforks;		/* (p) rfork() calls */
	counter_u64_t v_kthreads;	/* (p) fork() calls by kernel */
	counter_u64_t v_forkpages;	/* (p) pages affected by fork() */
	counter_u64_t v_vforkpages;	/* (p) pages affected by vfork() */
	counter_u64_t v_rforkpages;	/* (p) pages affected by rfork() */
	counter_u64_t v_kthreadpages;	/* (p) ... and by kernel fork() */
#define	VM_METER_NCOUNTERS	\
	(offsetof(struct vmmeter, v_page_size) / sizeof(counter_u64_t))
	/*
	 * Distribution of page usages.
	 */
	u_int v_page_size;	/* (c) page size in bytes */
	u_int v_page_count;	/* (c) total number of pages in system */
	u_int v_free_reserved;	/* (c) pages reserved for deadlock */
	u_int v_free_target;	/* (c) pages desired free */
	u_int v_free_min;	/* (c) pages desired free */
	u_int v_free_count;	/* (f) pages free */
	u_int v_inactive_target; /* (c) pages desired inactive */
	u_int v_pageout_free_min;   /* (c) min pages reserved for kernel */
	u_int v_interrupt_free_min; /* (c) reserved pages for int code */
	u_int v_free_severe;	/* (c) severe page depletion point */
	u_int v_wire_count VMMETER_ALIGNED; /* (a) pages wired down */
	u_int v_active_count VMMETER_ALIGNED; /* (a) pages active */
	u_int v_inactive_count VMMETER_ALIGNED;	/* (a) pages inactive */
	u_int v_laundry_count VMMETER_ALIGNED; /* (a) pages eligible for
						  laundering */
};
#endif /* _KERNEL || _WANT_VMMETER */

#ifdef _KERNEL

extern struct vmmeter vm_cnt;
extern u_int vm_pageout_wakeup_thresh;

#define	VM_CNT_ADD(var, x)	counter_u64_add(vm_cnt.var, x)
#define	VM_CNT_INC(var)		VM_CNT_ADD(var, 1)
#define	VM_CNT_FETCH(var)	counter_u64_fetch(vm_cnt.var)

/*
 * Return TRUE if we are under our severe low-free-pages threshold
 *
 * This routine is typically used at the user<->system interface to determine
 * whether we need to block in order to avoid a low memory deadlock.
 */
static inline int
vm_page_count_severe(void)
{

	return (vm_cnt.v_free_severe > vm_cnt.v_free_count);
}

/*
 * Return TRUE if we are under our minimum low-free-pages threshold.
 *
 * This routine is typically used within the system to determine whether
 * we can execute potentially very expensive code in terms of memory.  It
 * is also used by the pageout daemon to calculate when to sleep, when
 * to wake waiters up, and when (after making a pass) to become more
 * desperate.
 */
static inline int
vm_page_count_min(void)
{

	return (vm_cnt.v_free_min > vm_cnt.v_free_count);
}

/*
 * Return TRUE if we have not reached our free page target during
 * free page recovery operations.
 */
static inline int
vm_page_count_target(void)
{

	return (vm_cnt.v_free_target > vm_cnt.v_free_count);
}

/*
 * Return the number of pages we need to free-up or cache
 * A positive number indicates that we do not have enough free pages.
 */
static inline int
vm_paging_target(void)
{

	return (vm_cnt.v_free_target - vm_cnt.v_free_count);
}

/*
 * Returns TRUE if the pagedaemon needs to be woken up.
 */
static inline int
vm_paging_needed(void)
{

	return (vm_cnt.v_free_count < vm_pageout_wakeup_thresh);
}

/*
 * Return the number of pages we need to launder.
 * A positive number indicates that we have a shortfall of clean pages.
 */
static inline int
vm_laundry_target(void)
{

	return (vm_paging_target());
}
#endif	/* _KERNEL */
#endif	/* _SYS_VMMETER_H_ */