FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_pagequeue.h
1 /*-
2 * SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
3 *
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * The Mach Operating System project at Carnegie-Mellon University.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * from: @(#)vm_page.h 8.2 (Berkeley) 12/13/93
35 *
36 *
37 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
38 * All rights reserved.
39 *
40 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
41 *
42 * Permission to use, copy, modify and distribute this software and
43 * its documentation is hereby granted, provided that both the copyright
44 * notice and this permission notice appear in all copies of the
45 * software, derivative works or modified versions, and any portions
46 * thereof, and that both notices appear in supporting documentation.
47 *
48 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
49 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
50 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
51 *
52 * Carnegie Mellon requests users of this software to return to
53 *
54 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
55 * School of Computer Science
56 * Carnegie Mellon University
57 * Pittsburgh PA 15213-3890
58 *
59 * any improvements or extensions that they make and grant Carnegie the
60 * rights to redistribute these changes.
61 *
62 * $FreeBSD$
63 */
64
65 #ifndef _VM_PAGEQUEUE_
66 #define _VM_PAGEQUEUE_
67
68 #ifdef _KERNEL
69 struct vm_pagequeue {
70 struct mtx pq_mutex;
71 struct pglist pq_pl;
72 int pq_cnt;
73 const char * const pq_name;
74 uint64_t pq_pdpages;
75 } __aligned(CACHE_LINE_SIZE);
76
77 #ifndef VM_BATCHQUEUE_SIZE
78 #define VM_BATCHQUEUE_SIZE 7
79 #endif
80
81 struct vm_batchqueue {
82 vm_page_t bq_pa[VM_BATCHQUEUE_SIZE];
83 int bq_cnt;
84 } __aligned(CACHE_LINE_SIZE);
85
86 #include <vm/uma.h>
87 #include <sys/pidctrl.h>
88 struct sysctl_oid;
89
90 /*
91 * One vm_domain per-numa domain. Contains pagequeues, free page structures,
92 * and accounting.
93 *
94 * Lock Key:
95 * f vmd_free_mtx
96 * p vmd_pageout_mtx
97 * d vm_domainset_lock
98 * a atomic
99 * c const after boot
100 * q page queue lock
101 */
102 struct vm_domain {
103 struct vm_pagequeue vmd_pagequeues[PQ_COUNT];
104 struct mtx_padalign vmd_free_mtx;
105 struct mtx_padalign vmd_pageout_mtx;
106 struct vm_pgcache {
107 int domain;
108 int pool;
109 uma_zone_t zone;
110 } vmd_pgcache[VM_NFREEPOOL];
111 struct vmem *vmd_kernel_arena; /* (c) per-domain kva R/W arena. */
112 struct vmem *vmd_kernel_rwx_arena; /* (c) per-domain kva R/W/X arena. */
113 u_int vmd_domain; /* (c) Domain number. */
114 u_int vmd_page_count; /* (c) Total page count. */
115 long vmd_segs; /* (c) bitmask of the segments */
116 u_int __aligned(CACHE_LINE_SIZE) vmd_free_count; /* (a,f) free page count */
117 u_int vmd_pageout_deficit; /* (a) Estimated number of pages deficit */
118 uint8_t vmd_pad[CACHE_LINE_SIZE - (sizeof(u_int) * 2)];
119
120 /* Paging control variables, used within single threaded page daemon. */
121 struct pidctrl vmd_pid; /* Pageout controller. */
122 boolean_t vmd_oom;
123 int vmd_oom_seq;
124 int vmd_last_active_scan;
125 struct vm_page vmd_markers[PQ_COUNT]; /* (q) markers for queue scans */
126 struct vm_page vmd_inacthead; /* marker for LRU-defeating insertions */
127 struct vm_page vmd_clock[2]; /* markers for active queue scan */
128
129 int vmd_pageout_wanted; /* (a, p) pageout daemon wait channel */
130 int vmd_pageout_pages_needed; /* (d) page daemon waiting for pages? */
131 bool vmd_minset; /* (d) Are we in vm_min_domains? */
132 bool vmd_severeset; /* (d) Are we in vm_severe_domains? */
133 enum {
134 VM_LAUNDRY_IDLE = 0,
135 VM_LAUNDRY_BACKGROUND,
136 VM_LAUNDRY_SHORTFALL
137 } vmd_laundry_request;
138
139 /* Paging thresholds and targets. */
140 u_int vmd_clean_pages_freed; /* (q) accumulator for laundry thread */
141 u_int vmd_background_launder_target; /* (c) */
142 u_int vmd_free_reserved; /* (c) pages reserved for deadlock */
143 u_int vmd_free_target; /* (c) pages desired free */
144 u_int vmd_free_min; /* (c) pages desired free */
145 u_int vmd_inactive_target; /* (c) pages desired inactive */
146 u_int vmd_pageout_free_min; /* (c) min pages reserved for kernel */
147 u_int vmd_pageout_wakeup_thresh;/* (c) min pages to wake pagedaemon */
148 u_int vmd_interrupt_free_min; /* (c) reserved pages for int code */
149 u_int vmd_free_severe; /* (c) severe page depletion point */
150
151 /* Name for sysctl etc. */
152 struct sysctl_oid *vmd_oid;
153 char vmd_name[sizeof(__XSTRING(MAXMEMDOM))];
154 } __aligned(CACHE_LINE_SIZE);
155
156 extern struct vm_domain vm_dom[MAXMEMDOM];
157
158 #define VM_DOMAIN(n) (&vm_dom[(n)])
159 #define VM_DOMAIN_EMPTY(n) (vm_dom[(n)].vmd_page_count == 0)
160
161 #define vm_pagequeue_assert_locked(pq) mtx_assert(&(pq)->pq_mutex, MA_OWNED)
162 #define vm_pagequeue_lock(pq) mtx_lock(&(pq)->pq_mutex)
163 #define vm_pagequeue_lockptr(pq) (&(pq)->pq_mutex)
164 #define vm_pagequeue_trylock(pq) mtx_trylock(&(pq)->pq_mutex)
165 #define vm_pagequeue_unlock(pq) mtx_unlock(&(pq)->pq_mutex)
166
167 #define vm_domain_free_assert_locked(n) \
168 mtx_assert(vm_domain_free_lockptr((n)), MA_OWNED)
169 #define vm_domain_free_assert_unlocked(n) \
170 mtx_assert(vm_domain_free_lockptr((n)), MA_NOTOWNED)
171 #define vm_domain_free_lock(d) \
172 mtx_lock(vm_domain_free_lockptr((d)))
173 #define vm_domain_free_lockptr(d) \
174 (&(d)->vmd_free_mtx)
175 #define vm_domain_free_trylock(d) \
176 mtx_trylock(vm_domain_free_lockptr((d)))
177 #define vm_domain_free_unlock(d) \
178 mtx_unlock(vm_domain_free_lockptr((d)))
179
180 #define vm_domain_pageout_lockptr(d) \
181 (&(d)->vmd_pageout_mtx)
182 #define vm_domain_pageout_assert_locked(n) \
183 mtx_assert(vm_domain_pageout_lockptr((n)), MA_OWNED)
184 #define vm_domain_pageout_assert_unlocked(n) \
185 mtx_assert(vm_domain_pageout_lockptr((n)), MA_NOTOWNED)
186 #define vm_domain_pageout_lock(d) \
187 mtx_lock(vm_domain_pageout_lockptr((d)))
188 #define vm_domain_pageout_unlock(d) \
189 mtx_unlock(vm_domain_pageout_lockptr((d)))
190
191 static __inline void
192 vm_pagequeue_cnt_add(struct vm_pagequeue *pq, int addend)
193 {
194
195 vm_pagequeue_assert_locked(pq);
196 pq->pq_cnt += addend;
197 }
198 #define vm_pagequeue_cnt_inc(pq) vm_pagequeue_cnt_add((pq), 1)
199 #define vm_pagequeue_cnt_dec(pq) vm_pagequeue_cnt_add((pq), -1)
200
201 static inline void
202 vm_pagequeue_remove(struct vm_pagequeue *pq, vm_page_t m)
203 {
204
205 TAILQ_REMOVE(&pq->pq_pl, m, plinks.q);
206 vm_pagequeue_cnt_dec(pq);
207 }
208
209 static inline void
210 vm_batchqueue_init(struct vm_batchqueue *bq)
211 {
212
213 bq->bq_cnt = 0;
214 }
215
216 static inline bool
217 vm_batchqueue_insert(struct vm_batchqueue *bq, vm_page_t m)
218 {
219
220 if (bq->bq_cnt < nitems(bq->bq_pa)) {
221 bq->bq_pa[bq->bq_cnt++] = m;
222 return (true);
223 }
224 return (false);
225 }
226
227 static inline vm_page_t
228 vm_batchqueue_pop(struct vm_batchqueue *bq)
229 {
230
231 if (bq->bq_cnt == 0)
232 return (NULL);
233 return (bq->bq_pa[--bq->bq_cnt]);
234 }
235
236 void vm_domain_set(struct vm_domain *vmd);
237 void vm_domain_clear(struct vm_domain *vmd);
238 int vm_domain_allocate(struct vm_domain *vmd, int req, int npages);
239
240 /*
241 * vm_pagequeue_domain:
242 *
243 * Return the memory domain the page belongs to.
244 */
245 static inline struct vm_domain *
246 vm_pagequeue_domain(vm_page_t m)
247 {
248
249 return (VM_DOMAIN(vm_phys_domain(m)));
250 }
251
252 /*
253 * Return the number of pages we need to free-up or cache
254 * A positive number indicates that we do not have enough free pages.
255 */
256 static inline int
257 vm_paging_target(struct vm_domain *vmd)
258 {
259
260 return (vmd->vmd_free_target - vmd->vmd_free_count);
261 }
262
263 /*
264 * Returns TRUE if the pagedaemon needs to be woken up.
265 */
266 static inline int
267 vm_paging_needed(struct vm_domain *vmd, u_int free_count)
268 {
269
270 return (free_count < vmd->vmd_pageout_wakeup_thresh);
271 }
272
273 /*
274 * Returns TRUE if the domain is below the min paging target.
275 */
276 static inline int
277 vm_paging_min(struct vm_domain *vmd)
278 {
279
280 return (vmd->vmd_free_min > vmd->vmd_free_count);
281 }
282
283 /*
284 * Returns TRUE if the domain is below the severe paging target.
285 */
286 static inline int
287 vm_paging_severe(struct vm_domain *vmd)
288 {
289
290 return (vmd->vmd_free_severe > vmd->vmd_free_count);
291 }
292
293 /*
294 * Return the number of pages we need to launder.
295 * A positive number indicates that we have a shortfall of clean pages.
296 */
297 static inline int
298 vm_laundry_target(struct vm_domain *vmd)
299 {
300
301 return (vm_paging_target(vmd));
302 }
303
304 void pagedaemon_wakeup(int domain);
305
306 static inline void
307 vm_domain_freecnt_inc(struct vm_domain *vmd, int adj)
308 {
309 u_int old, new;
310
311 old = atomic_fetchadd_int(&vmd->vmd_free_count, adj);
312 new = old + adj;
313 /*
314 * Only update bitsets on transitions. Notice we short-circuit the
315 * rest of the checks if we're above min already.
316 */
317 if (old < vmd->vmd_free_min && (new >= vmd->vmd_free_min ||
318 (old < vmd->vmd_free_severe && new >= vmd->vmd_free_severe) ||
319 (old < vmd->vmd_pageout_free_min &&
320 new >= vmd->vmd_pageout_free_min)))
321 vm_domain_clear(vmd);
322 }
323
324 #endif /* _KERNEL */
325 #endif /* !_VM_PAGEQUEUE_ */
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