3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
| 3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
|
34*/
35
36#ifndef VM_UMA_H
37#define VM_UMA_H
38
39#include <sys/param.h> /* For NULL */
40#include <sys/malloc.h> /* For M_* */
41
42/* User visable parameters */
43#define UMA_SMALLEST_UNIT (PAGE_SIZE / 256) /* Smallest item allocated */
44
45/* Types and type defs */
46
47struct uma_zone;
48/* Opaque type used as a handle to the zone */
49typedef struct uma_zone * uma_zone_t;
50
51/*
52 * Item constructor
53 *
54 * Arguments:
55 * item A pointer to the memory which has been allocated.
56 * arg The arg field passed to uma_zalloc_arg
57 * size The size of the allocated item
58 *
59 * Returns:
60 * Nothing
61 *
62 * Discussion:
63 * The constructor is called just before the memory is returned
64 * to the user. It may block if neccisary.
65 */
66typedef void (*uma_ctor)(void *mem, int size, void *arg);
67
68/*
69 * Item destructor
70 *
71 * Arguments:
72 * item A pointer to the memory which has been allocated.
73 * size The size of the item being destructed.
74 * arg Argument passed through uma_zfree_arg
75 *
76 * Returns:
77 * Nothing
78 *
79 * Discussion:
80 * The destructor may perform operations that differ from those performed
81 * by the initializer, but it must leave the object in the same state.
82 * This IS type stable storage. This is called after EVERY zfree call.
83 */
84typedef void (*uma_dtor)(void *mem, int size, void *arg);
85
86/*
87 * Item initializer
88 *
89 * Arguments:
90 * item A pointer to the memory which has been allocated.
91 * size The size of the item being initialized.
92 *
93 * Returns:
94 * Nothing
95 *
96 * Discussion:
97 * The initializer is called when the memory is cached in the uma zone.
98 * this should be the same state that the destructor leaves the object in.
99 */
100typedef void (*uma_init)(void *mem, int size);
101
102/*
103 * Item discard function
104 *
105 * Arguments:
106 * item A pointer to memory which has been 'freed' but has not left the
107 * zone's cache.
108 * size The size of the item being discarded.
109 *
110 * Returns:
111 * Nothing
112 *
113 * Discussion:
114 * This routine is called when memory leaves a zone and is returned to the
115 * system for other uses. It is the counter part to the init function.
116 */
117typedef void (*uma_fini)(void *mem, int size);
118
119/*
120 * What's the difference between initializing and constructing?
121 *
122 * The item is initialized when it is cached, and this is the state that the
123 * object should be in when returned to the allocator. The purpose of this is
124 * to remove some code which would otherwise be called on each allocation by
125 * utilizing a known, stable state. This differs from the constructor which
126 * will be called on EVERY allocation.
127 *
128 * For example, in the initializer you may want to initialize embeded locks,
129 * NULL list pointers, set up initial states, magic numbers, etc. This way if
130 * the object is held in the allocator and re-used it won't be neccisary to
131 * re-initialize it.
132 *
133 * The constructor may be used to lock a data structure, link it on to lists,
134 * bump reference counts or total counts of outstanding structures, etc.
135 *
136 */
137
138
139/* Function proto types */
140
141/*
142 * Create a new uma zone
143 *
144 * Arguments:
145 * name The text name of the zone for debugging and stats, this memory
146 * should not be freed until the zone has been deallocated.
147 * size The size of the object that is being created.
148 * ctor The constructor that is called when the object is allocated
149 * dtor The destructor that is called when the object is freed.
150 * init An initializer that sets up the initial state of the memory.
151 * fini A discard function that undoes initialization done by init.
152 * ctor/dtor/init/fini may all be null, see notes above.
153 * align A bitmask that corisponds to the requested alignment
154 * eg 4 would be 0x3
155 * flags A set of parameters that control the behavior of the zone
156 *
157 * Returns:
158 * A pointer to a structure which is intended to be opaque to users of
159 * the interface. The value may be null if the wait flag is not set.
160 */
161
162uma_zone_t uma_zcreate(char *name, size_t size, uma_ctor ctor, uma_dtor dtor,
163 uma_init uminit, uma_fini fini, int align,
164 u_int16_t flags);
165
166/* Definitions for uma_zcreate flags */
167#define UMA_ZONE_PAGEABLE 0x0001 /* Return items not fully backed by
168 physical memory XXX Not yet */
169#define UMA_ZONE_ZINIT 0x0002 /* Initialize with zeros */
170#define UMA_ZONE_STATIC 0x0004 /* Staticly sized zone */
171#define UMA_ZONE_OFFPAGE 0x0008 /* Force the slab structure allocation
172 off of the real memory */
173#define UMA_ZONE_MALLOC 0x0010 /* For use by malloc(9) only! */
174#define UMA_ZONE_NOFREE 0x0020 /* Do not free slabs of this type! */
175#define UMA_ZONE_MTXCLASS 0x0040 /* Create a new lock class */
176#define UMA_ZONE_VM 0x0080 /*
177 * Used for internal vm datastructures
178 * only.
179 */
180#define UMA_ZONE_HASH 0x0100 /*
181 * Use a hash table instead of caching
182 * information in the vm_page.
183 */
184
185/* Definitions for align */
186#define UMA_ALIGN_PTR (sizeof(void *) - 1) /* Alignment fit for ptr */
187#define UMA_ALIGN_LONG (sizeof(long) - 1) /* "" long */
188#define UMA_ALIGN_INT (sizeof(int) - 1) /* "" int */
189#define UMA_ALIGN_SHORT (sizeof(short) - 1) /* "" short */
190#define UMA_ALIGN_CHAR (sizeof(char) - 1) /* "" char */
191#define UMA_ALIGN_CACHE (16 - 1) /* Cache line size align */
192
193/*
194 * Destroys an empty uma zone. If the zone is not empty uma complains loudly.
195 *
196 * Arguments:
197 * zone The zone we want to destroy.
198 *
199 */
200
201void uma_zdestroy(uma_zone_t zone);
202
203/*
204 * Allocates an item out of a zone
205 *
206 * Arguments:
207 * zone The zone we are allocating from
208 * arg This data is passed to the ctor function
209 * flags See sys/malloc.h for available flags.
210 *
211 * Returns:
212 * A non null pointer to an initialized element from the zone is
213 * garanteed if the wait flag is M_WAITOK, otherwise a null pointer may be
214 * returned if the zone is empty or the ctor failed.
215 */
216
217void *uma_zalloc_arg(uma_zone_t zone, void *arg, int flags);
218
219/*
220 * Allocates an item out of a zone without supplying an argument
221 *
222 * This is just a wrapper for uma_zalloc_arg for convenience.
223 *
224 */
225static __inline void *uma_zalloc(uma_zone_t zone, int flags);
226
227static __inline void *
228uma_zalloc(uma_zone_t zone, int flags)
229{
230 return uma_zalloc_arg(zone, NULL, flags);
231}
232
233/*
234 * Frees an item back into the specified zone.
235 *
236 * Arguments:
237 * zone The zone the item was originally allocated out of.
238 * item The memory to be freed.
239 * arg Argument passed to the destructor
240 *
241 * Returns:
242 * Nothing.
243 */
244
245void uma_zfree_arg(uma_zone_t zone, void *item, void *arg);
246
247/*
248 * Frees an item back to a zone without supplying an argument
249 *
250 * This is just a wrapper for uma_zfree_arg for convenience.
251 *
252 */
253static __inline void uma_zfree(uma_zone_t zone, void *item);
254
255static __inline void
256uma_zfree(uma_zone_t zone, void *item)
257{
258 uma_zfree_arg(zone, item, NULL);
259}
260
261/*
262 * XXX The rest of the prototypes in this header are h0h0 magic for the VM.
263 * If you think you need to use it for a normal zone you're probably incorrect.
264 */
265
266/*
267 * Backend page supplier routines
268 *
269 * Arguments:
270 * zone The zone that is requesting pages
271 * size The number of bytes being requested
272 * pflag Flags for these memory pages, see below.
273 * wait Indicates our willingness to block.
274 *
275 * Returns:
276 * A pointer to the alloced memory or NULL on failure.
277 */
278
279typedef void *(*uma_alloc)(uma_zone_t zone, int size, u_int8_t *pflag, int wait);
280
281/*
282 * Backend page free routines
283 *
284 * Arguments:
285 * item A pointer to the previously allocated pages
286 * size The original size of the allocation
287 * pflag The flags for the slab. See UMA_SLAB_* below
288 *
289 * Returns:
290 * None
291 */
292typedef void (*uma_free)(void *item, int size, u_int8_t pflag);
293
294
295
296/*
297 * Sets up the uma allocator. (Called by vm_mem_init)
298 *
299 * Arguments:
300 * bootmem A pointer to memory used to bootstrap the system.
301 *
302 * Returns:
303 * Nothing
304 *
305 * Discussion:
306 * This memory is used for zones which allocate things before the
307 * backend page supplier can give us pages. It should be
308 * UMA_SLAB_SIZE * UMA_BOOT_PAGES bytes. (see uma_int.h)
309 *
310 */
311
312void uma_startup(void *bootmem);
313
314/*
315 * Finishes starting up the allocator. This should
316 * be called when kva is ready for normal allocs.
317 *
318 * Arguments:
319 * None
320 *
321 * Returns:
322 * Nothing
323 *
324 * Discussion:
325 * uma_startup2 is called by kmeminit() to enable us of uma for malloc.
326 */
327
328void uma_startup2(void);
329
330/*
331 * Reclaims unused memory for all zones
332 *
333 * Arguments:
334 * None
335 * Returns:
336 * None
337 *
338 * This should only be called by the page out daemon.
339 */
340
341void uma_reclaim(void);
342
343/*
344 * Switches the backing object of a zone
345 *
346 * Arguments:
347 * zone The zone to update
348 * obj The obj to use for future allocations
349 * size The size of the object to allocate
350 *
351 * Returns:
352 * 0 if kva space can not be allocated
353 * 1 if successful
354 *
355 * Discussion:
356 * A NULL object can be used and uma will allocate one for you. Setting
357 * the size will limit the amount of memory allocated to this zone.
358 *
359 */
360struct vm_object;
361int uma_zone_set_obj(uma_zone_t zone, struct vm_object *obj, int size);
362
363/*
364 * Sets a high limit on the number of items allowed in a zone
365 *
366 * Arguments:
367 * zone The zone to limit
368 *
369 * Returns:
370 * Nothing
371 */
372void uma_zone_set_max(uma_zone_t zone, int nitems);
373
374/*
375 * Replaces the standard page_alloc or obj_alloc functions for this zone
376 *
377 * Arguments:
378 * zone The zone whos back end allocator is being changed.
379 * allocf A pointer to the allocation function
380 *
381 * Returns:
382 * Nothing
383 *
384 * Discussion:
385 * This could be used to implement pageable allocation, or perhaps
386 * even DMA allocators if used in conjunction with the OFFPAGE
387 * zone flag.
388 */
389
390void uma_zone_set_allocf(uma_zone_t zone, uma_alloc allocf);
391
392/*
393 * Used for freeing memory provided by the allocf above
394 *
395 * Arguments:
396 * zone The zone that intends to use this free routine.
397 * freef The page freeing routine.
398 *
399 * Returns:
400 * Nothing
401 */
402
403void uma_zone_set_freef(uma_zone_t zone, uma_free freef);
404
405/*
406 * These flags are setable in the allocf and visable in the freef.
407 */
408#define UMA_SLAB_BOOT 0x01 /* Slab alloced from boot pages */
409#define UMA_SLAB_KMEM 0x02 /* Slab alloced from kmem_map */
410#define UMA_SLAB_PRIV 0x08 /* Slab alloced from priv allocator */
411#define UMA_SLAB_OFFP 0x10 /* Slab is managed separately */
412#define UMA_SLAB_MALLOC 0x20 /* Slab is a large malloc slab */
413/* 0x40 and 0x80 are available */
414
415/*
416 * Used to pre-fill a zone with some number of items
417 *
418 * Arguments:
419 * zone The zone to fill
420 * itemcnt The number of items to reserve
421 *
422 * Returns:
423 * Nothing
424 *
425 * NOTE: This is blocking and should only be done at startup
426 */
427void uma_prealloc(uma_zone_t zone, int itemcnt);
428
429
430#endif
| 33*/
34
35#ifndef VM_UMA_H
36#define VM_UMA_H
37
38#include <sys/param.h> /* For NULL */
39#include <sys/malloc.h> /* For M_* */
40
41/* User visable parameters */
42#define UMA_SMALLEST_UNIT (PAGE_SIZE / 256) /* Smallest item allocated */
43
44/* Types and type defs */
45
46struct uma_zone;
47/* Opaque type used as a handle to the zone */
48typedef struct uma_zone * uma_zone_t;
49
50/*
51 * Item constructor
52 *
53 * Arguments:
54 * item A pointer to the memory which has been allocated.
55 * arg The arg field passed to uma_zalloc_arg
56 * size The size of the allocated item
57 *
58 * Returns:
59 * Nothing
60 *
61 * Discussion:
62 * The constructor is called just before the memory is returned
63 * to the user. It may block if neccisary.
64 */
65typedef void (*uma_ctor)(void *mem, int size, void *arg);
66
67/*
68 * Item destructor
69 *
70 * Arguments:
71 * item A pointer to the memory which has been allocated.
72 * size The size of the item being destructed.
73 * arg Argument passed through uma_zfree_arg
74 *
75 * Returns:
76 * Nothing
77 *
78 * Discussion:
79 * The destructor may perform operations that differ from those performed
80 * by the initializer, but it must leave the object in the same state.
81 * This IS type stable storage. This is called after EVERY zfree call.
82 */
83typedef void (*uma_dtor)(void *mem, int size, void *arg);
84
85/*
86 * Item initializer
87 *
88 * Arguments:
89 * item A pointer to the memory which has been allocated.
90 * size The size of the item being initialized.
91 *
92 * Returns:
93 * Nothing
94 *
95 * Discussion:
96 * The initializer is called when the memory is cached in the uma zone.
97 * this should be the same state that the destructor leaves the object in.
98 */
99typedef void (*uma_init)(void *mem, int size);
100
101/*
102 * Item discard function
103 *
104 * Arguments:
105 * item A pointer to memory which has been 'freed' but has not left the
106 * zone's cache.
107 * size The size of the item being discarded.
108 *
109 * Returns:
110 * Nothing
111 *
112 * Discussion:
113 * This routine is called when memory leaves a zone and is returned to the
114 * system for other uses. It is the counter part to the init function.
115 */
116typedef void (*uma_fini)(void *mem, int size);
117
118/*
119 * What's the difference between initializing and constructing?
120 *
121 * The item is initialized when it is cached, and this is the state that the
122 * object should be in when returned to the allocator. The purpose of this is
123 * to remove some code which would otherwise be called on each allocation by
124 * utilizing a known, stable state. This differs from the constructor which
125 * will be called on EVERY allocation.
126 *
127 * For example, in the initializer you may want to initialize embeded locks,
128 * NULL list pointers, set up initial states, magic numbers, etc. This way if
129 * the object is held in the allocator and re-used it won't be neccisary to
130 * re-initialize it.
131 *
132 * The constructor may be used to lock a data structure, link it on to lists,
133 * bump reference counts or total counts of outstanding structures, etc.
134 *
135 */
136
137
138/* Function proto types */
139
140/*
141 * Create a new uma zone
142 *
143 * Arguments:
144 * name The text name of the zone for debugging and stats, this memory
145 * should not be freed until the zone has been deallocated.
146 * size The size of the object that is being created.
147 * ctor The constructor that is called when the object is allocated
148 * dtor The destructor that is called when the object is freed.
149 * init An initializer that sets up the initial state of the memory.
150 * fini A discard function that undoes initialization done by init.
151 * ctor/dtor/init/fini may all be null, see notes above.
152 * align A bitmask that corisponds to the requested alignment
153 * eg 4 would be 0x3
154 * flags A set of parameters that control the behavior of the zone
155 *
156 * Returns:
157 * A pointer to a structure which is intended to be opaque to users of
158 * the interface. The value may be null if the wait flag is not set.
159 */
160
161uma_zone_t uma_zcreate(char *name, size_t size, uma_ctor ctor, uma_dtor dtor,
162 uma_init uminit, uma_fini fini, int align,
163 u_int16_t flags);
164
165/* Definitions for uma_zcreate flags */
166#define UMA_ZONE_PAGEABLE 0x0001 /* Return items not fully backed by
167 physical memory XXX Not yet */
168#define UMA_ZONE_ZINIT 0x0002 /* Initialize with zeros */
169#define UMA_ZONE_STATIC 0x0004 /* Staticly sized zone */
170#define UMA_ZONE_OFFPAGE 0x0008 /* Force the slab structure allocation
171 off of the real memory */
172#define UMA_ZONE_MALLOC 0x0010 /* For use by malloc(9) only! */
173#define UMA_ZONE_NOFREE 0x0020 /* Do not free slabs of this type! */
174#define UMA_ZONE_MTXCLASS 0x0040 /* Create a new lock class */
175#define UMA_ZONE_VM 0x0080 /*
176 * Used for internal vm datastructures
177 * only.
178 */
179#define UMA_ZONE_HASH 0x0100 /*
180 * Use a hash table instead of caching
181 * information in the vm_page.
182 */
183
184/* Definitions for align */
185#define UMA_ALIGN_PTR (sizeof(void *) - 1) /* Alignment fit for ptr */
186#define UMA_ALIGN_LONG (sizeof(long) - 1) /* "" long */
187#define UMA_ALIGN_INT (sizeof(int) - 1) /* "" int */
188#define UMA_ALIGN_SHORT (sizeof(short) - 1) /* "" short */
189#define UMA_ALIGN_CHAR (sizeof(char) - 1) /* "" char */
190#define UMA_ALIGN_CACHE (16 - 1) /* Cache line size align */
191
192/*
193 * Destroys an empty uma zone. If the zone is not empty uma complains loudly.
194 *
195 * Arguments:
196 * zone The zone we want to destroy.
197 *
198 */
199
200void uma_zdestroy(uma_zone_t zone);
201
202/*
203 * Allocates an item out of a zone
204 *
205 * Arguments:
206 * zone The zone we are allocating from
207 * arg This data is passed to the ctor function
208 * flags See sys/malloc.h for available flags.
209 *
210 * Returns:
211 * A non null pointer to an initialized element from the zone is
212 * garanteed if the wait flag is M_WAITOK, otherwise a null pointer may be
213 * returned if the zone is empty or the ctor failed.
214 */
215
216void *uma_zalloc_arg(uma_zone_t zone, void *arg, int flags);
217
218/*
219 * Allocates an item out of a zone without supplying an argument
220 *
221 * This is just a wrapper for uma_zalloc_arg for convenience.
222 *
223 */
224static __inline void *uma_zalloc(uma_zone_t zone, int flags);
225
226static __inline void *
227uma_zalloc(uma_zone_t zone, int flags)
228{
229 return uma_zalloc_arg(zone, NULL, flags);
230}
231
232/*
233 * Frees an item back into the specified zone.
234 *
235 * Arguments:
236 * zone The zone the item was originally allocated out of.
237 * item The memory to be freed.
238 * arg Argument passed to the destructor
239 *
240 * Returns:
241 * Nothing.
242 */
243
244void uma_zfree_arg(uma_zone_t zone, void *item, void *arg);
245
246/*
247 * Frees an item back to a zone without supplying an argument
248 *
249 * This is just a wrapper for uma_zfree_arg for convenience.
250 *
251 */
252static __inline void uma_zfree(uma_zone_t zone, void *item);
253
254static __inline void
255uma_zfree(uma_zone_t zone, void *item)
256{
257 uma_zfree_arg(zone, item, NULL);
258}
259
260/*
261 * XXX The rest of the prototypes in this header are h0h0 magic for the VM.
262 * If you think you need to use it for a normal zone you're probably incorrect.
263 */
264
265/*
266 * Backend page supplier routines
267 *
268 * Arguments:
269 * zone The zone that is requesting pages
270 * size The number of bytes being requested
271 * pflag Flags for these memory pages, see below.
272 * wait Indicates our willingness to block.
273 *
274 * Returns:
275 * A pointer to the alloced memory or NULL on failure.
276 */
277
278typedef void *(*uma_alloc)(uma_zone_t zone, int size, u_int8_t *pflag, int wait);
279
280/*
281 * Backend page free routines
282 *
283 * Arguments:
284 * item A pointer to the previously allocated pages
285 * size The original size of the allocation
286 * pflag The flags for the slab. See UMA_SLAB_* below
287 *
288 * Returns:
289 * None
290 */
291typedef void (*uma_free)(void *item, int size, u_int8_t pflag);
292
293
294
295/*
296 * Sets up the uma allocator. (Called by vm_mem_init)
297 *
298 * Arguments:
299 * bootmem A pointer to memory used to bootstrap the system.
300 *
301 * Returns:
302 * Nothing
303 *
304 * Discussion:
305 * This memory is used for zones which allocate things before the
306 * backend page supplier can give us pages. It should be
307 * UMA_SLAB_SIZE * UMA_BOOT_PAGES bytes. (see uma_int.h)
308 *
309 */
310
311void uma_startup(void *bootmem);
312
313/*
314 * Finishes starting up the allocator. This should
315 * be called when kva is ready for normal allocs.
316 *
317 * Arguments:
318 * None
319 *
320 * Returns:
321 * Nothing
322 *
323 * Discussion:
324 * uma_startup2 is called by kmeminit() to enable us of uma for malloc.
325 */
326
327void uma_startup2(void);
328
329/*
330 * Reclaims unused memory for all zones
331 *
332 * Arguments:
333 * None
334 * Returns:
335 * None
336 *
337 * This should only be called by the page out daemon.
338 */
339
340void uma_reclaim(void);
341
342/*
343 * Switches the backing object of a zone
344 *
345 * Arguments:
346 * zone The zone to update
347 * obj The obj to use for future allocations
348 * size The size of the object to allocate
349 *
350 * Returns:
351 * 0 if kva space can not be allocated
352 * 1 if successful
353 *
354 * Discussion:
355 * A NULL object can be used and uma will allocate one for you. Setting
356 * the size will limit the amount of memory allocated to this zone.
357 *
358 */
359struct vm_object;
360int uma_zone_set_obj(uma_zone_t zone, struct vm_object *obj, int size);
361
362/*
363 * Sets a high limit on the number of items allowed in a zone
364 *
365 * Arguments:
366 * zone The zone to limit
367 *
368 * Returns:
369 * Nothing
370 */
371void uma_zone_set_max(uma_zone_t zone, int nitems);
372
373/*
374 * Replaces the standard page_alloc or obj_alloc functions for this zone
375 *
376 * Arguments:
377 * zone The zone whos back end allocator is being changed.
378 * allocf A pointer to the allocation function
379 *
380 * Returns:
381 * Nothing
382 *
383 * Discussion:
384 * This could be used to implement pageable allocation, or perhaps
385 * even DMA allocators if used in conjunction with the OFFPAGE
386 * zone flag.
387 */
388
389void uma_zone_set_allocf(uma_zone_t zone, uma_alloc allocf);
390
391/*
392 * Used for freeing memory provided by the allocf above
393 *
394 * Arguments:
395 * zone The zone that intends to use this free routine.
396 * freef The page freeing routine.
397 *
398 * Returns:
399 * Nothing
400 */
401
402void uma_zone_set_freef(uma_zone_t zone, uma_free freef);
403
404/*
405 * These flags are setable in the allocf and visable in the freef.
406 */
407#define UMA_SLAB_BOOT 0x01 /* Slab alloced from boot pages */
408#define UMA_SLAB_KMEM 0x02 /* Slab alloced from kmem_map */
409#define UMA_SLAB_PRIV 0x08 /* Slab alloced from priv allocator */
410#define UMA_SLAB_OFFP 0x10 /* Slab is managed separately */
411#define UMA_SLAB_MALLOC 0x20 /* Slab is a large malloc slab */
412/* 0x40 and 0x80 are available */
413
414/*
415 * Used to pre-fill a zone with some number of items
416 *
417 * Arguments:
418 * zone The zone to fill
419 * itemcnt The number of items to reserve
420 *
421 * Returns:
422 * Nothing
423 *
424 * NOTE: This is blocking and should only be done at startup
425 */
426void uma_prealloc(uma_zone_t zone, int itemcnt);
427
428
429#endif
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