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 *
| 6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
12 * disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
|
27 *
28 */
29
30/*
31 * uma.h - External definitions for the Universal Memory Allocator
32 *
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 * flags See zalloc flags
58 *
59 * Returns:
60 * 0 on success
61 * errno on failure
62 *
63 * Discussion:
64 * The constructor is called just before the memory is returned
65 * to the user. It may block if necessary.
66 */
67typedef int (*uma_ctor)(void *mem, int size, void *arg, int flags);
68
69/*
70 * Item destructor
71 *
72 * Arguments:
73 * item A pointer to the memory which has been allocated.
74 * size The size of the item being destructed.
75 * arg Argument passed through uma_zfree_arg
76 *
77 * Returns:
78 * Nothing
79 *
80 * Discussion:
81 * The destructor may perform operations that differ from those performed
82 * by the initializer, but it must leave the object in the same state.
83 * This IS type stable storage. This is called after EVERY zfree call.
84 */
85typedef void (*uma_dtor)(void *mem, int size, void *arg);
86
87/*
88 * Item initializer
89 *
90 * Arguments:
91 * item A pointer to the memory which has been allocated.
92 * size The size of the item being initialized.
93 * flags See zalloc flags
94 *
95 * Returns:
96 * 0 on success
97 * errno on failure
98 *
99 * Discussion:
100 * The initializer is called when the memory is cached in the uma zone.
101 * this should be the same state that the destructor leaves the object in.
102 */
103typedef int (*uma_init)(void *mem, int size, int flags);
104
105/*
106 * Item discard function
107 *
108 * Arguments:
109 * item A pointer to memory which has been 'freed' but has not left the
110 * zone's cache.
111 * size The size of the item being discarded.
112 *
113 * Returns:
114 * Nothing
115 *
116 * Discussion:
117 * This routine is called when memory leaves a zone and is returned to the
118 * system for other uses. It is the counter part to the init function.
119 */
120typedef void (*uma_fini)(void *mem, int size);
121
122/*
123 * What's the difference between initializing and constructing?
124 *
125 * The item is initialized when it is cached, and this is the state that the
126 * object should be in when returned to the allocator. The purpose of this is
127 * to remove some code which would otherwise be called on each allocation by
128 * utilizing a known, stable state. This differs from the constructor which
129 * will be called on EVERY allocation.
130 *
131 * For example, in the initializer you may want to initialize embeded locks,
132 * NULL list pointers, set up initial states, magic numbers, etc. This way if
133 * the object is held in the allocator and re-used it won't be necessary to
134 * re-initialize it.
135 *
136 * The constructor may be used to lock a data structure, link it on to lists,
137 * bump reference counts or total counts of outstanding structures, etc.
138 *
139 */
140
141
142/* Function proto types */
143
144/*
145 * Create a new uma zone
146 *
147 * Arguments:
148 * name The text name of the zone for debugging and stats, this memory
149 * should not be freed until the zone has been deallocated.
150 * size The size of the object that is being created.
151 * ctor The constructor that is called when the object is allocated
152 * dtor The destructor that is called when the object is freed.
153 * init An initializer that sets up the initial state of the memory.
154 * fini A discard function that undoes initialization done by init.
155 * ctor/dtor/init/fini may all be null, see notes above.
156 * align A bitmask that corisponds to the requested alignment
157 * eg 4 would be 0x3
158 * flags A set of parameters that control the behavior of the zone
159 *
160 * Returns:
161 * A pointer to a structure which is intended to be opaque to users of
162 * the interface. The value may be null if the wait flag is not set.
163 */
164uma_zone_t uma_zcreate(char *name, size_t size, uma_ctor ctor, uma_dtor dtor,
165 uma_init uminit, uma_fini fini, int align,
166 u_int16_t flags);
167
168/*
169 * Create a secondary uma zone
170 *
171 * Arguments:
172 * name The text name of the zone for debugging and stats, this memory
173 * should not be freed until the zone has been deallocated.
174 * ctor The constructor that is called when the object is allocated
175 * dtor The destructor that is called when the object is freed.
176 * zinit An initializer that sets up the initial state of the memory
177 * as the object passes from the Keg's slab to the Zone's cache.
178 * zfini A discard function that undoes initialization done by init
179 * as the object passes from the Zone's cache to the Keg's slab.
180 *
181 * ctor/dtor/zinit/zfini may all be null, see notes above.
182 * Note that the zinit and zfini specified here are NOT
183 * exactly the same as the init/fini specified to uma_zcreate()
184 * when creating a master zone. These zinit/zfini are called
185 * on the TRANSITION from keg to zone (and vice-versa). Once
186 * these are set, the primary zone may alter its init/fini
187 * (which are called when the object passes from VM to keg)
188 * using uma_zone_set_init/fini()) as well as its own
189 * zinit/zfini (unset by default for master zone) with
190 * uma_zone_set_zinit/zfini() (note subtle 'z' prefix).
191 *
192 * master A reference to this zone's Master Zone (Primary Zone),
193 * which contains the backing Keg for the Secondary Zone
194 * being added.
195 *
196 * Returns:
197 * A pointer to a structure which is intended to be opaque to users of
198 * the interface. The value may be null if the wait flag is not set.
199 */
200uma_zone_t uma_zsecond_create(char *name, uma_ctor ctor, uma_dtor dtor,
201 uma_init zinit, uma_fini zfini, uma_zone_t master);
202
203/*
204 * Definitions for uma_zcreate flags
205 *
206 * These flags share space with UMA_ZFLAGs in uma_int.h. Be careful not to
207 * overlap when adding new features. 0xf000 is in use by uma_int.h.
208 */
209#define UMA_ZONE_PAGEABLE 0x0001 /* Return items not fully backed by
210 physical memory XXX Not yet */
211#define UMA_ZONE_ZINIT 0x0002 /* Initialize with zeros */
212#define UMA_ZONE_STATIC 0x0004 /* Staticly sized zone */
213#define UMA_ZONE_OFFPAGE 0x0008 /* Force the slab structure allocation
214 off of the real memory */
215#define UMA_ZONE_MALLOC 0x0010 /* For use by malloc(9) only! */
216#define UMA_ZONE_NOFREE 0x0020 /* Do not free slabs of this type! */
217#define UMA_ZONE_MTXCLASS 0x0040 /* Create a new lock class */
218#define UMA_ZONE_VM 0x0080 /*
219 * Used for internal vm datastructures
220 * only.
221 */
222#define UMA_ZONE_HASH 0x0100 /*
223 * Use a hash table instead of caching
224 * information in the vm_page.
225 */
226#define UMA_ZONE_SECONDARY 0x0200 /* Zone is a Secondary Zone */
227#define UMA_ZONE_REFCNT 0x0400 /* Allocate refcnts in slabs */
228#define UMA_ZONE_MAXBUCKET 0x0800 /* Use largest buckets */
229
230/* Definitions for align */
231#define UMA_ALIGN_PTR (sizeof(void *) - 1) /* Alignment fit for ptr */
232#define UMA_ALIGN_LONG (sizeof(long) - 1) /* "" long */
233#define UMA_ALIGN_INT (sizeof(int) - 1) /* "" int */
234#define UMA_ALIGN_SHORT (sizeof(short) - 1) /* "" short */
235#define UMA_ALIGN_CHAR (sizeof(char) - 1) /* "" char */
236#define UMA_ALIGN_CACHE (16 - 1) /* Cache line size align */
237
238/*
239 * Destroys an empty uma zone. If the zone is not empty uma complains loudly.
240 *
241 * Arguments:
242 * zone The zone we want to destroy.
243 *
244 */
245void uma_zdestroy(uma_zone_t zone);
246
247/*
248 * Allocates an item out of a zone
249 *
250 * Arguments:
251 * zone The zone we are allocating from
252 * arg This data is passed to the ctor function
253 * flags See sys/malloc.h for available flags.
254 *
255 * Returns:
256 * A non null pointer to an initialized element from the zone is
257 * garanteed if the wait flag is M_WAITOK, otherwise a null pointer may be
258 * returned if the zone is empty or the ctor failed.
259 */
260
261void *uma_zalloc_arg(uma_zone_t zone, void *arg, int flags);
262
263/*
264 * Allocates an item out of a zone without supplying an argument
265 *
266 * This is just a wrapper for uma_zalloc_arg for convenience.
267 *
268 */
269static __inline void *uma_zalloc(uma_zone_t zone, int flags);
270
271static __inline void *
272uma_zalloc(uma_zone_t zone, int flags)
273{
274 return uma_zalloc_arg(zone, NULL, flags);
275}
276
277/*
278 * Frees an item back into the specified zone.
279 *
280 * Arguments:
281 * zone The zone the item was originally allocated out of.
282 * item The memory to be freed.
283 * arg Argument passed to the destructor
284 *
285 * Returns:
286 * Nothing.
287 */
288
289void uma_zfree_arg(uma_zone_t zone, void *item, void *arg);
290
291/*
292 * Frees an item back to a zone without supplying an argument
293 *
294 * This is just a wrapper for uma_zfree_arg for convenience.
295 *
296 */
297static __inline void uma_zfree(uma_zone_t zone, void *item);
298
299static __inline void
300uma_zfree(uma_zone_t zone, void *item)
301{
302 uma_zfree_arg(zone, item, NULL);
303}
304
305/*
306 * XXX The rest of the prototypes in this header are h0h0 magic for the VM.
307 * If you think you need to use it for a normal zone you're probably incorrect.
308 */
309
310/*
311 * Backend page supplier routines
312 *
313 * Arguments:
314 * zone The zone that is requesting pages
315 * size The number of bytes being requested
316 * pflag Flags for these memory pages, see below.
317 * wait Indicates our willingness to block.
318 *
319 * Returns:
320 * A pointer to the alloced memory or NULL on failure.
321 */
322
323typedef void *(*uma_alloc)(uma_zone_t zone, int size, u_int8_t *pflag, int wait);
324
325/*
326 * Backend page free routines
327 *
328 * Arguments:
329 * item A pointer to the previously allocated pages
330 * size The original size of the allocation
331 * pflag The flags for the slab. See UMA_SLAB_* below
332 *
333 * Returns:
334 * None
335 */
336typedef void (*uma_free)(void *item, int size, u_int8_t pflag);
337
338
339
340/*
341 * Sets up the uma allocator. (Called by vm_mem_init)
342 *
343 * Arguments:
344 * bootmem A pointer to memory used to bootstrap the system.
345 *
346 * Returns:
347 * Nothing
348 *
349 * Discussion:
350 * This memory is used for zones which allocate things before the
351 * backend page supplier can give us pages. It should be
352 * UMA_SLAB_SIZE * UMA_BOOT_PAGES bytes. (see uma_int.h)
353 *
354 */
355
356void uma_startup(void *bootmem);
357
358/*
359 * Finishes starting up the allocator. This should
360 * be called when kva is ready for normal allocs.
361 *
362 * Arguments:
363 * None
364 *
365 * Returns:
366 * Nothing
367 *
368 * Discussion:
369 * uma_startup2 is called by kmeminit() to enable us of uma for malloc.
370 */
371
372void uma_startup2(void);
373
374/*
375 * Reclaims unused memory for all zones
376 *
377 * Arguments:
378 * None
379 * Returns:
380 * None
381 *
382 * This should only be called by the page out daemon.
383 */
384
385void uma_reclaim(void);
386
387/*
388 * Switches the backing object of a zone
389 *
390 * Arguments:
391 * zone The zone to update
392 * obj The obj to use for future allocations
393 * size The size of the object to allocate
394 *
395 * Returns:
396 * 0 if kva space can not be allocated
397 * 1 if successful
398 *
399 * Discussion:
400 * A NULL object can be used and uma will allocate one for you. Setting
401 * the size will limit the amount of memory allocated to this zone.
402 *
403 */
404struct vm_object;
405int uma_zone_set_obj(uma_zone_t zone, struct vm_object *obj, int size);
406
407/*
408 * Sets a high limit on the number of items allowed in a zone
409 *
410 * Arguments:
411 * zone The zone to limit
412 *
413 * Returns:
414 * Nothing
415 */
416void uma_zone_set_max(uma_zone_t zone, int nitems);
417
418/*
419 * The following two routines (uma_zone_set_init/fini)
420 * are used to set the backend init/fini pair which acts on an
421 * object as it becomes allocated and is placed in a slab within
422 * the specified zone's backing keg. These should probably not
423 * be changed once allocations have already begun and only
424 * immediately upon zone creation.
425 */
426void uma_zone_set_init(uma_zone_t zone, uma_init uminit);
427void uma_zone_set_fini(uma_zone_t zone, uma_fini fini);
428
429/*
430 * The following two routines (uma_zone_set_zinit/zfini) are
431 * used to set the zinit/zfini pair which acts on an object as
432 * it passes from the backing Keg's slab cache to the
433 * specified Zone's bucket cache. These should probably not
434 * be changed once allocations have already begun and
435 * only immediately upon zone creation.
436 */
437void uma_zone_set_zinit(uma_zone_t zone, uma_init zinit);
438void uma_zone_set_zfini(uma_zone_t zone, uma_fini zfini);
439
440/*
441 * Replaces the standard page_alloc or obj_alloc functions for this zone
442 *
443 * Arguments:
444 * zone The zone whos back end allocator is being changed.
445 * allocf A pointer to the allocation function
446 *
447 * Returns:
448 * Nothing
449 *
450 * Discussion:
451 * This could be used to implement pageable allocation, or perhaps
452 * even DMA allocators if used in conjunction with the OFFPAGE
453 * zone flag.
454 */
455
456void uma_zone_set_allocf(uma_zone_t zone, uma_alloc allocf);
457
458/*
459 * Used for freeing memory provided by the allocf above
460 *
461 * Arguments:
462 * zone The zone that intends to use this free routine.
463 * freef The page freeing routine.
464 *
465 * Returns:
466 * Nothing
467 */
468
469void uma_zone_set_freef(uma_zone_t zone, uma_free freef);
470
471/*
472 * These flags are setable in the allocf and visable in the freef.
473 */
474#define UMA_SLAB_BOOT 0x01 /* Slab alloced from boot pages */
475#define UMA_SLAB_KMEM 0x02 /* Slab alloced from kmem_map */
476#define UMA_SLAB_PRIV 0x08 /* Slab alloced from priv allocator */
477#define UMA_SLAB_OFFP 0x10 /* Slab is managed separately */
478#define UMA_SLAB_MALLOC 0x20 /* Slab is a large malloc slab */
479/* 0x40 and 0x80 are available */
480
481/*
482 * Used to pre-fill a zone with some number of items
483 *
484 * Arguments:
485 * zone The zone to fill
486 * itemcnt The number of items to reserve
487 *
488 * Returns:
489 * Nothing
490 *
491 * NOTE: This is blocking and should only be done at startup
492 */
493void uma_prealloc(uma_zone_t zone, int itemcnt);
494
495/*
496 * Used to lookup the reference counter allocated for an item
497 * from a UMA_ZONE_REFCNT zone. For UMA_ZONE_REFCNT zones,
498 * reference counters are allocated for items and stored in
499 * the underlying slab header.
500 *
501 * Arguments:
502 * zone The UMA_ZONE_REFCNT zone to which the item belongs.
503 * item The address of the item for which we want a refcnt.
504 *
505 * Returns:
506 * A pointer to a u_int32_t reference counter.
507 */
508u_int32_t *uma_find_refcnt(uma_zone_t zone, void *item);
509
510#endif
| 29 *
30 */
31
32/*
33 * uma.h - External definitions for the Universal Memory Allocator
34 *
35*/
36
37#ifndef VM_UMA_H
38#define VM_UMA_H
39
40#include <sys/param.h> /* For NULL */
41#include <sys/malloc.h> /* For M_* */
42
43/* User visable parameters */
44#define UMA_SMALLEST_UNIT (PAGE_SIZE / 256) /* Smallest item allocated */
45
46/* Types and type defs */
47
48struct uma_zone;
49/* Opaque type used as a handle to the zone */
50typedef struct uma_zone * uma_zone_t;
51
52/*
53 * Item constructor
54 *
55 * Arguments:
56 * item A pointer to the memory which has been allocated.
57 * arg The arg field passed to uma_zalloc_arg
58 * size The size of the allocated item
59 * flags See zalloc flags
60 *
61 * Returns:
62 * 0 on success
63 * errno on failure
64 *
65 * Discussion:
66 * The constructor is called just before the memory is returned
67 * to the user. It may block if necessary.
68 */
69typedef int (*uma_ctor)(void *mem, int size, void *arg, int flags);
70
71/*
72 * Item destructor
73 *
74 * Arguments:
75 * item A pointer to the memory which has been allocated.
76 * size The size of the item being destructed.
77 * arg Argument passed through uma_zfree_arg
78 *
79 * Returns:
80 * Nothing
81 *
82 * Discussion:
83 * The destructor may perform operations that differ from those performed
84 * by the initializer, but it must leave the object in the same state.
85 * This IS type stable storage. This is called after EVERY zfree call.
86 */
87typedef void (*uma_dtor)(void *mem, int size, void *arg);
88
89/*
90 * Item initializer
91 *
92 * Arguments:
93 * item A pointer to the memory which has been allocated.
94 * size The size of the item being initialized.
95 * flags See zalloc flags
96 *
97 * Returns:
98 * 0 on success
99 * errno on failure
100 *
101 * Discussion:
102 * The initializer is called when the memory is cached in the uma zone.
103 * this should be the same state that the destructor leaves the object in.
104 */
105typedef int (*uma_init)(void *mem, int size, int flags);
106
107/*
108 * Item discard function
109 *
110 * Arguments:
111 * item A pointer to memory which has been 'freed' but has not left the
112 * zone's cache.
113 * size The size of the item being discarded.
114 *
115 * Returns:
116 * Nothing
117 *
118 * Discussion:
119 * This routine is called when memory leaves a zone and is returned to the
120 * system for other uses. It is the counter part to the init function.
121 */
122typedef void (*uma_fini)(void *mem, int size);
123
124/*
125 * What's the difference between initializing and constructing?
126 *
127 * The item is initialized when it is cached, and this is the state that the
128 * object should be in when returned to the allocator. The purpose of this is
129 * to remove some code which would otherwise be called on each allocation by
130 * utilizing a known, stable state. This differs from the constructor which
131 * will be called on EVERY allocation.
132 *
133 * For example, in the initializer you may want to initialize embeded locks,
134 * NULL list pointers, set up initial states, magic numbers, etc. This way if
135 * the object is held in the allocator and re-used it won't be necessary to
136 * re-initialize it.
137 *
138 * The constructor may be used to lock a data structure, link it on to lists,
139 * bump reference counts or total counts of outstanding structures, etc.
140 *
141 */
142
143
144/* Function proto types */
145
146/*
147 * Create a new uma zone
148 *
149 * Arguments:
150 * name The text name of the zone for debugging and stats, this memory
151 * should not be freed until the zone has been deallocated.
152 * size The size of the object that is being created.
153 * ctor The constructor that is called when the object is allocated
154 * dtor The destructor that is called when the object is freed.
155 * init An initializer that sets up the initial state of the memory.
156 * fini A discard function that undoes initialization done by init.
157 * ctor/dtor/init/fini may all be null, see notes above.
158 * align A bitmask that corisponds to the requested alignment
159 * eg 4 would be 0x3
160 * flags A set of parameters that control the behavior of the zone
161 *
162 * Returns:
163 * A pointer to a structure which is intended to be opaque to users of
164 * the interface. The value may be null if the wait flag is not set.
165 */
166uma_zone_t uma_zcreate(char *name, size_t size, uma_ctor ctor, uma_dtor dtor,
167 uma_init uminit, uma_fini fini, int align,
168 u_int16_t flags);
169
170/*
171 * Create a secondary uma zone
172 *
173 * Arguments:
174 * name The text name of the zone for debugging and stats, this memory
175 * should not be freed until the zone has been deallocated.
176 * ctor The constructor that is called when the object is allocated
177 * dtor The destructor that is called when the object is freed.
178 * zinit An initializer that sets up the initial state of the memory
179 * as the object passes from the Keg's slab to the Zone's cache.
180 * zfini A discard function that undoes initialization done by init
181 * as the object passes from the Zone's cache to the Keg's slab.
182 *
183 * ctor/dtor/zinit/zfini may all be null, see notes above.
184 * Note that the zinit and zfini specified here are NOT
185 * exactly the same as the init/fini specified to uma_zcreate()
186 * when creating a master zone. These zinit/zfini are called
187 * on the TRANSITION from keg to zone (and vice-versa). Once
188 * these are set, the primary zone may alter its init/fini
189 * (which are called when the object passes from VM to keg)
190 * using uma_zone_set_init/fini()) as well as its own
191 * zinit/zfini (unset by default for master zone) with
192 * uma_zone_set_zinit/zfini() (note subtle 'z' prefix).
193 *
194 * master A reference to this zone's Master Zone (Primary Zone),
195 * which contains the backing Keg for the Secondary Zone
196 * being added.
197 *
198 * Returns:
199 * A pointer to a structure which is intended to be opaque to users of
200 * the interface. The value may be null if the wait flag is not set.
201 */
202uma_zone_t uma_zsecond_create(char *name, uma_ctor ctor, uma_dtor dtor,
203 uma_init zinit, uma_fini zfini, uma_zone_t master);
204
205/*
206 * Definitions for uma_zcreate flags
207 *
208 * These flags share space with UMA_ZFLAGs in uma_int.h. Be careful not to
209 * overlap when adding new features. 0xf000 is in use by uma_int.h.
210 */
211#define UMA_ZONE_PAGEABLE 0x0001 /* Return items not fully backed by
212 physical memory XXX Not yet */
213#define UMA_ZONE_ZINIT 0x0002 /* Initialize with zeros */
214#define UMA_ZONE_STATIC 0x0004 /* Staticly sized zone */
215#define UMA_ZONE_OFFPAGE 0x0008 /* Force the slab structure allocation
216 off of the real memory */
217#define UMA_ZONE_MALLOC 0x0010 /* For use by malloc(9) only! */
218#define UMA_ZONE_NOFREE 0x0020 /* Do not free slabs of this type! */
219#define UMA_ZONE_MTXCLASS 0x0040 /* Create a new lock class */
220#define UMA_ZONE_VM 0x0080 /*
221 * Used for internal vm datastructures
222 * only.
223 */
224#define UMA_ZONE_HASH 0x0100 /*
225 * Use a hash table instead of caching
226 * information in the vm_page.
227 */
228#define UMA_ZONE_SECONDARY 0x0200 /* Zone is a Secondary Zone */
229#define UMA_ZONE_REFCNT 0x0400 /* Allocate refcnts in slabs */
230#define UMA_ZONE_MAXBUCKET 0x0800 /* Use largest buckets */
231
232/* Definitions for align */
233#define UMA_ALIGN_PTR (sizeof(void *) - 1) /* Alignment fit for ptr */
234#define UMA_ALIGN_LONG (sizeof(long) - 1) /* "" long */
235#define UMA_ALIGN_INT (sizeof(int) - 1) /* "" int */
236#define UMA_ALIGN_SHORT (sizeof(short) - 1) /* "" short */
237#define UMA_ALIGN_CHAR (sizeof(char) - 1) /* "" char */
238#define UMA_ALIGN_CACHE (16 - 1) /* Cache line size align */
239
240/*
241 * Destroys an empty uma zone. If the zone is not empty uma complains loudly.
242 *
243 * Arguments:
244 * zone The zone we want to destroy.
245 *
246 */
247void uma_zdestroy(uma_zone_t zone);
248
249/*
250 * Allocates an item out of a zone
251 *
252 * Arguments:
253 * zone The zone we are allocating from
254 * arg This data is passed to the ctor function
255 * flags See sys/malloc.h for available flags.
256 *
257 * Returns:
258 * A non null pointer to an initialized element from the zone is
259 * garanteed if the wait flag is M_WAITOK, otherwise a null pointer may be
260 * returned if the zone is empty or the ctor failed.
261 */
262
263void *uma_zalloc_arg(uma_zone_t zone, void *arg, int flags);
264
265/*
266 * Allocates an item out of a zone without supplying an argument
267 *
268 * This is just a wrapper for uma_zalloc_arg for convenience.
269 *
270 */
271static __inline void *uma_zalloc(uma_zone_t zone, int flags);
272
273static __inline void *
274uma_zalloc(uma_zone_t zone, int flags)
275{
276 return uma_zalloc_arg(zone, NULL, flags);
277}
278
279/*
280 * Frees an item back into the specified zone.
281 *
282 * Arguments:
283 * zone The zone the item was originally allocated out of.
284 * item The memory to be freed.
285 * arg Argument passed to the destructor
286 *
287 * Returns:
288 * Nothing.
289 */
290
291void uma_zfree_arg(uma_zone_t zone, void *item, void *arg);
292
293/*
294 * Frees an item back to a zone without supplying an argument
295 *
296 * This is just a wrapper for uma_zfree_arg for convenience.
297 *
298 */
299static __inline void uma_zfree(uma_zone_t zone, void *item);
300
301static __inline void
302uma_zfree(uma_zone_t zone, void *item)
303{
304 uma_zfree_arg(zone, item, NULL);
305}
306
307/*
308 * XXX The rest of the prototypes in this header are h0h0 magic for the VM.
309 * If you think you need to use it for a normal zone you're probably incorrect.
310 */
311
312/*
313 * Backend page supplier routines
314 *
315 * Arguments:
316 * zone The zone that is requesting pages
317 * size The number of bytes being requested
318 * pflag Flags for these memory pages, see below.
319 * wait Indicates our willingness to block.
320 *
321 * Returns:
322 * A pointer to the alloced memory or NULL on failure.
323 */
324
325typedef void *(*uma_alloc)(uma_zone_t zone, int size, u_int8_t *pflag, int wait);
326
327/*
328 * Backend page free routines
329 *
330 * Arguments:
331 * item A pointer to the previously allocated pages
332 * size The original size of the allocation
333 * pflag The flags for the slab. See UMA_SLAB_* below
334 *
335 * Returns:
336 * None
337 */
338typedef void (*uma_free)(void *item, int size, u_int8_t pflag);
339
340
341
342/*
343 * Sets up the uma allocator. (Called by vm_mem_init)
344 *
345 * Arguments:
346 * bootmem A pointer to memory used to bootstrap the system.
347 *
348 * Returns:
349 * Nothing
350 *
351 * Discussion:
352 * This memory is used for zones which allocate things before the
353 * backend page supplier can give us pages. It should be
354 * UMA_SLAB_SIZE * UMA_BOOT_PAGES bytes. (see uma_int.h)
355 *
356 */
357
358void uma_startup(void *bootmem);
359
360/*
361 * Finishes starting up the allocator. This should
362 * be called when kva is ready for normal allocs.
363 *
364 * Arguments:
365 * None
366 *
367 * Returns:
368 * Nothing
369 *
370 * Discussion:
371 * uma_startup2 is called by kmeminit() to enable us of uma for malloc.
372 */
373
374void uma_startup2(void);
375
376/*
377 * Reclaims unused memory for all zones
378 *
379 * Arguments:
380 * None
381 * Returns:
382 * None
383 *
384 * This should only be called by the page out daemon.
385 */
386
387void uma_reclaim(void);
388
389/*
390 * Switches the backing object of a zone
391 *
392 * Arguments:
393 * zone The zone to update
394 * obj The obj to use for future allocations
395 * size The size of the object to allocate
396 *
397 * Returns:
398 * 0 if kva space can not be allocated
399 * 1 if successful
400 *
401 * Discussion:
402 * A NULL object can be used and uma will allocate one for you. Setting
403 * the size will limit the amount of memory allocated to this zone.
404 *
405 */
406struct vm_object;
407int uma_zone_set_obj(uma_zone_t zone, struct vm_object *obj, int size);
408
409/*
410 * Sets a high limit on the number of items allowed in a zone
411 *
412 * Arguments:
413 * zone The zone to limit
414 *
415 * Returns:
416 * Nothing
417 */
418void uma_zone_set_max(uma_zone_t zone, int nitems);
419
420/*
421 * The following two routines (uma_zone_set_init/fini)
422 * are used to set the backend init/fini pair which acts on an
423 * object as it becomes allocated and is placed in a slab within
424 * the specified zone's backing keg. These should probably not
425 * be changed once allocations have already begun and only
426 * immediately upon zone creation.
427 */
428void uma_zone_set_init(uma_zone_t zone, uma_init uminit);
429void uma_zone_set_fini(uma_zone_t zone, uma_fini fini);
430
431/*
432 * The following two routines (uma_zone_set_zinit/zfini) are
433 * used to set the zinit/zfini pair which acts on an object as
434 * it passes from the backing Keg's slab cache to the
435 * specified Zone's bucket cache. These should probably not
436 * be changed once allocations have already begun and
437 * only immediately upon zone creation.
438 */
439void uma_zone_set_zinit(uma_zone_t zone, uma_init zinit);
440void uma_zone_set_zfini(uma_zone_t zone, uma_fini zfini);
441
442/*
443 * Replaces the standard page_alloc or obj_alloc functions for this zone
444 *
445 * Arguments:
446 * zone The zone whos back end allocator is being changed.
447 * allocf A pointer to the allocation function
448 *
449 * Returns:
450 * Nothing
451 *
452 * Discussion:
453 * This could be used to implement pageable allocation, or perhaps
454 * even DMA allocators if used in conjunction with the OFFPAGE
455 * zone flag.
456 */
457
458void uma_zone_set_allocf(uma_zone_t zone, uma_alloc allocf);
459
460/*
461 * Used for freeing memory provided by the allocf above
462 *
463 * Arguments:
464 * zone The zone that intends to use this free routine.
465 * freef The page freeing routine.
466 *
467 * Returns:
468 * Nothing
469 */
470
471void uma_zone_set_freef(uma_zone_t zone, uma_free freef);
472
473/*
474 * These flags are setable in the allocf and visable in the freef.
475 */
476#define UMA_SLAB_BOOT 0x01 /* Slab alloced from boot pages */
477#define UMA_SLAB_KMEM 0x02 /* Slab alloced from kmem_map */
478#define UMA_SLAB_PRIV 0x08 /* Slab alloced from priv allocator */
479#define UMA_SLAB_OFFP 0x10 /* Slab is managed separately */
480#define UMA_SLAB_MALLOC 0x20 /* Slab is a large malloc slab */
481/* 0x40 and 0x80 are available */
482
483/*
484 * Used to pre-fill a zone with some number of items
485 *
486 * Arguments:
487 * zone The zone to fill
488 * itemcnt The number of items to reserve
489 *
490 * Returns:
491 * Nothing
492 *
493 * NOTE: This is blocking and should only be done at startup
494 */
495void uma_prealloc(uma_zone_t zone, int itemcnt);
496
497/*
498 * Used to lookup the reference counter allocated for an item
499 * from a UMA_ZONE_REFCNT zone. For UMA_ZONE_REFCNT zones,
500 * reference counters are allocated for items and stored in
501 * the underlying slab header.
502 *
503 * Arguments:
504 * zone The UMA_ZONE_REFCNT zone to which the item belongs.
505 * item The address of the item for which we want a refcnt.
506 *
507 * Returns:
508 * A pointer to a u_int32_t reference counter.
509 */
510u_int32_t *uma_find_refcnt(uma_zone_t zone, void *item);
511
512#endif
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