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
229
230
231
232
233
234
235
236
237
|
/*-
* Copyright (c) 1998 Matthew Dillon. 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.
* 4. 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 AUTHOR ``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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/vmmeter.h>
#include <sys/vnode.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_kern.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pageout.h>
#include <vm/vm_pager.h>
#include <vm/vm_extern.h>
struct vpgqueues vm_page_queues[PQ_COUNT];
void
vm_pageq_init(void)
{
int i;
for (i = 0; i < PQ_L2_SIZE; i++) {
vm_page_queues[PQ_FREE+i].cnt = &cnt.v_free_count;
}
for (i = 0; i < PQ_L2_SIZE; i++) {
vm_page_queues[PQ_CACHE+i].cnt = &cnt.v_cache_count;
}
vm_page_queues[PQ_INACTIVE].cnt = &cnt.v_inactive_count;
vm_page_queues[PQ_ACTIVE].cnt = &cnt.v_active_count;
vm_page_queues[PQ_HOLD].cnt = &cnt.v_active_count;
for (i = 0; i < PQ_COUNT; i++) {
TAILQ_INIT(&vm_page_queues[i].pl);
}
}
void
vm_pageq_requeue(vm_page_t m)
{
int queue = m->queue;
struct vpgqueues *vpq;
if (queue != PQ_NONE) {
vpq = &vm_page_queues[queue];
TAILQ_REMOVE(&vpq->pl, m, pageq);
TAILQ_INSERT_TAIL(&vpq->pl, m, pageq);
}
}
/*
* vm_pageq_enqueue:
*/
void
vm_pageq_enqueue(int queue, vm_page_t m)
{
struct vpgqueues *vpq;
vpq = &vm_page_queues[queue];
m->queue = queue;
TAILQ_INSERT_TAIL(&vpq->pl, m, pageq);
++*vpq->cnt;
++vpq->lcnt;
}
/*
* vm_add_new_page:
*
* Add a new page to the freelist for use by the system.
* Must be called at splhigh().
*/
vm_page_t
vm_pageq_add_new_page(vm_paddr_t pa)
{
vm_page_t m;
GIANT_REQUIRED;
++cnt.v_page_count;
m = PHYS_TO_VM_PAGE(pa);
m->phys_addr = pa;
m->flags = 0;
m->pc = (pa >> PAGE_SHIFT) & PQ_L2_MASK;
vm_pageq_enqueue(m->pc + PQ_FREE, m);
return (m);
}
/*
* vm_pageq_remove_nowakeup:
*
* vm_page_unqueue() without any wakeup
*
* This routine must be called at splhigh().
* This routine may not block.
*/
void
vm_pageq_remove_nowakeup(vm_page_t m)
{
int queue = m->queue;
struct vpgqueues *pq;
if (queue != PQ_NONE) {
pq = &vm_page_queues[queue];
m->queue = PQ_NONE;
TAILQ_REMOVE(&pq->pl, m, pageq);
(*pq->cnt)--;
pq->lcnt--;
}
}
/*
* vm_pageq_remove:
*
* Remove a page from its queue.
*
* This routine must be called at splhigh().
* This routine may not block.
*/
void
vm_pageq_remove(vm_page_t m)
{
int queue = m->queue;
struct vpgqueues *pq;
if (queue != PQ_NONE) {
m->queue = PQ_NONE;
pq = &vm_page_queues[queue];
TAILQ_REMOVE(&pq->pl, m, pageq);
(*pq->cnt)--;
pq->lcnt--;
if ((queue - m->pc) == PQ_CACHE) {
if (vm_paging_needed())
pagedaemon_wakeup();
}
}
}
#if PQ_L2_SIZE > 1
/*
* vm_pageq_find:
*
* Find a page on the specified queue with color optimization.
*
* The page coloring optimization attempts to locate a page
* that does not overload other nearby pages in the object in
* the cpu's L2 cache. We need this optimization because cpu
* caches tend to be physical caches, while object spaces tend
* to be virtual.
*
* This routine must be called at splvm().
* This routine may not block.
*
* This routine may only be called from the vm_pageq_find()
* function in this file.
*/
static __inline vm_page_t
_vm_pageq_find(int basequeue, int index)
{
int i;
vm_page_t m = NULL;
struct vpgqueues *pq;
pq = &vm_page_queues[basequeue];
/*
* Note that for the first loop, index+i and index-i wind up at the
* same place. Even though this is not totally optimal, we've already
* blown it by missing the cache case so we do not care.
*/
for (i = PQ_L2_SIZE / 2; i > 0; --i) {
if ((m = TAILQ_FIRST(&pq[(index + i) & PQ_L2_MASK].pl)) != NULL)
break;
if ((m = TAILQ_FIRST(&pq[(index - i) & PQ_L2_MASK].pl)) != NULL)
break;
}
return (m);
}
#endif /* PQ_L2_SIZE > 1 */
vm_page_t
vm_pageq_find(int basequeue, int index, boolean_t prefer_zero)
{
vm_page_t m;
#if PQ_L2_SIZE > 1
if (prefer_zero) {
m = TAILQ_LAST(&vm_page_queues[basequeue+index].pl, pglist);
} else {
m = TAILQ_FIRST(&vm_page_queues[basequeue+index].pl);
}
if (m == NULL) {
m = _vm_pageq_find(basequeue, index);
}
#else
if (prefer_zero) {
m = TAILQ_LAST(&vm_page_queues[basequeue].pl, pglist);
} else {
m = TAILQ_FIRST(&vm_page_queues[basequeue].pl);
}
#endif
return (m);
}
|
