1/*-
2 * Copyright (c) 2002, 2003, 2004, 2005 Jeffrey Roberson <jeff@FreeBSD.org>
3 * Copyright (c) 2004, 2005 Bosko Milekic <bmilekic@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
--- 10 unchanged lines hidden (view full) ---
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * $FreeBSD: head/sys/vm/uma.h 184546 2008-11-02 00:41:26Z keramida $
28 *
29 */
30
31/*
32 * uma.h - External definitions for the Universal Memory Allocator
33 *
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 visible 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
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96 * flags See zalloc flags
97 *
98 * Returns:
99 * 0 on success
100 * errno on failure
101 *
102 * Discussion:
103 * The initializer is called when the memory is cached in the uma zone.
104 * The initializer and the destructor should leave the object in the same
105 * state.
106 */
107typedef int (*uma_init)(void *mem, int size, int flags);
108
109/*
110 * Item discard function
111 *
112 * Arguments:
113 * item A pointer to memory which has been 'freed' but has not left the
114 * zone's cache.
115 * size The size of the item being discarded.
116 *
117 * Returns:
118 * Nothing
119 *
120 * Discussion:
121 * This routine is called when memory leaves a zone and is returned to the
122 * system for other uses. It is the counter-part to the init function.
123 */
124typedef void (*uma_fini)(void *mem, int size);
125
126/*
127 * What's the difference between initializing and constructing?
128 *
129 * The item is initialized when it is cached, and this is the state that the
130 * object should be in when returned to the allocator. The purpose of this is
131 * to remove some code which would otherwise be called on each allocation by
132 * utilizing a known, stable state. This differs from the constructor which
133 * will be called on EVERY allocation.
134 *
135 * For example, in the initializer you may want to initialize embedded locks,
136 * NULL list pointers, set up initial states, magic numbers, etc. This way if
137 * the object is held in the allocator and re-used it won't be necessary to
138 * re-initialize it.
139 *
140 * The constructor may be used to lock a data structure, link it on to lists,
141 * bump reference counts or total counts of outstanding structures, etc.
142 *
143 */
144
145
146/* Function proto types */
147
148/*
149 * Create a new uma zone
150 *
151 * Arguments:
152 * name The text name of the zone for debugging and stats. This memory
153 * should not be freed until the zone has been deallocated.
154 * size The size of the object that is being created.
155 * ctor The constructor that is called when the object is allocated.
156 * dtor The destructor that is called when the object is freed.
157 * init An initializer that sets up the initial state of the memory.
158 * fini A discard function that undoes initialization done by init.
159 * ctor/dtor/init/fini may all be null, see notes above.
160 * align A bitmask that corresponds to the requested alignment
161 * eg 4 would be 0x3
162 * flags A set of parameters that control the behavior of the zone.
163 *
164 * Returns:
165 * A pointer to a structure which is intended to be opaque to users of
166 * the interface. The value may be null if the wait flag is not set.
167 */
168uma_zone_t uma_zcreate(char *name, size_t size, uma_ctor ctor, uma_dtor dtor,
169 uma_init uminit, uma_fini fini, int align,
170 u_int32_t flags);
171
172/*
173 * Create a secondary uma zone
174 *
175 * Arguments:
176 * name The text name of the zone for debugging and stats. This memory
177 * should not be freed until the zone has been deallocated.
178 * ctor The constructor that is called when the object is allocated.
179 * dtor The destructor that is called when the object is freed.
180 * zinit An initializer that sets up the initial state of the memory
181 * as the object passes from the Keg's slab to the Zone's cache.
182 * zfini A discard function that undoes initialization done by init
183 * as the object passes from the Zone's cache to the Keg's slab.
184 *
185 * ctor/dtor/zinit/zfini may all be null, see notes above.
186 * Note that the zinit and zfini specified here are NOT
--- 21 unchanged lines hidden (view full) ---
208 * Definitions for uma_zcreate flags
209 *
210 * These flags share space with UMA_ZFLAGs in uma_int.h. Be careful not to
211 * overlap when adding new features. 0xf0000000 is in use by uma_int.h.
212 */
213#define UMA_ZONE_PAGEABLE 0x0001 /* Return items not fully backed by
214 physical memory XXX Not yet */
215#define UMA_ZONE_ZINIT 0x0002 /* Initialize with zeros */
216#define UMA_ZONE_STATIC 0x0004 /* Statically sized zone */
217#define UMA_ZONE_OFFPAGE 0x0008 /* Force the slab structure allocation
218 off of the real memory */
219#define UMA_ZONE_MALLOC 0x0010 /* For use by malloc(9) only! */
220#define UMA_ZONE_NOFREE 0x0020 /* Do not free slabs of this type! */
221#define UMA_ZONE_MTXCLASS 0x0040 /* Create a new lock class */
222#define UMA_ZONE_VM 0x0080 /*
223 * Used for internal vm datastructures
224 * only.
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252 * Allocates an item out of a zone
253 *
254 * Arguments:
255 * zone The zone we are allocating from
256 * arg This data is passed to the ctor function
257 * flags See sys/malloc.h for available flags.
258 *
259 * Returns:
260 * A non-null pointer to an initialized element from the zone is
261 * guaranteed if the wait flag is M_WAITOK. Otherwise a null pointer
262 * may be returned if the zone is empty or the ctor failed.
263 */
264
265void *uma_zalloc_arg(uma_zone_t zone, void *arg, int flags);
266
267/*
268 * Allocates an item out of a zone without supplying an argument
269 *
270 * This is just a wrapper for uma_zalloc_arg for convenience.
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310 * XXX The rest of the prototypes in this header are h0h0 magic for the VM.
311 * If you think you need to use it for a normal zone you're probably incorrect.
312 */
313
314/*
315 * Backend page supplier routines
316 *
317 * Arguments:
318 * zone The zone that is requesting pages.
319 * size The number of bytes being requested.
320 * pflag Flags for these memory pages, see below.
321 * wait Indicates our willingness to block.
322 *
323 * Returns:
324 * A pointer to the allocated memory or NULL on failure.
325 */
326
327typedef void *(*uma_alloc)(uma_zone_t zone, int size, u_int8_t *pflag, int wait);
328
329/*
330 * Backend page free routines
331 *
332 * Arguments:
333 * item A pointer to the previously allocated pages.
334 * size The original size of the allocation.
335 * pflag The flags for the slab. See UMA_SLAB_* below.
336 *
337 * Returns:
338 * None
339 */
340typedef void (*uma_free)(void *item, int size, u_int8_t pflag);
341
342
343
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399 * Nothing
400 */
401void uma_set_align(int align);
402
403/*
404 * Switches the backing object of a zone
405 *
406 * Arguments:
407 * zone The zone to update.
408 * obj The VM object to use for future allocations.
409 * size The size of the object to allocate.
410 *
411 * Returns:
412 * 0 if kva space can not be allocated
413 * 1 if successful
414 *
415 * Discussion:
416 * A NULL object can be used and uma will allocate one for you. Setting
417 * the size will limit the amount of memory allocated to this zone.
--- 13 unchanged lines hidden (view full) ---
431 */
432void uma_zone_set_max(uma_zone_t zone, int nitems);
433
434/*
435 * The following two routines (uma_zone_set_init/fini)
436 * are used to set the backend init/fini pair which acts on an
437 * object as it becomes allocated and is placed in a slab within
438 * the specified zone's backing keg. These should probably not
439 * be changed once allocations have already begun, but only be set
440 * immediately upon zone creation.
441 */
442void uma_zone_set_init(uma_zone_t zone, uma_init uminit);
443void uma_zone_set_fini(uma_zone_t zone, uma_fini fini);
444
445/*
446 * The following two routines (uma_zone_set_zinit/zfini) are
447 * used to set the zinit/zfini pair which acts on an object as
448 * it passes from the backing Keg's slab cache to the
449 * specified Zone's bucket cache. These should probably not
450 * be changed once allocations have already begun, but only be set
451 * immediately upon zone creation.
452 */
453void uma_zone_set_zinit(uma_zone_t zone, uma_init zinit);
454void uma_zone_set_zfini(uma_zone_t zone, uma_fini zfini);
455
456/*
457 * Replaces the standard page_alloc or obj_alloc functions for this zone
458 *
459 * Arguments:
460 * zone The zone whose backend allocator is being changed.
461 * allocf A pointer to the allocation function
462 *
463 * Returns:
464 * Nothing
465 *
466 * Discussion:
467 * This could be used to implement pageable allocation, or perhaps
468 * even DMA allocators if used in conjunction with the OFFPAGE
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480 *
481 * Returns:
482 * Nothing
483 */
484
485void uma_zone_set_freef(uma_zone_t zone, uma_free freef);
486
487/*
488 * These flags are setable in the allocf and visible in the freef.
489 */
490#define UMA_SLAB_BOOT 0x01 /* Slab alloced from boot pages */
491#define UMA_SLAB_KMEM 0x02 /* Slab alloced from kmem_map */
492#define UMA_SLAB_KERNEL 0x04 /* Slab alloced from kernel_map */
493#define UMA_SLAB_PRIV 0x08 /* Slab alloced from priv allocator */
494#define UMA_SLAB_OFFP 0x10 /* Slab is managed separately */
495#define UMA_SLAB_MALLOC 0x20 /* Slab is a large malloc slab */
496/* 0x40 and 0x80 are available */
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533 * Returns:
534 * Non-zero if zone is exhausted.
535 */
536int uma_zone_exhausted(uma_zone_t zone);
537int uma_zone_exhausted_nolock(uma_zone_t zone);
538
539/*
540 * Exported statistics structures to be used by user space monitoring tools.
541 * Statistics stream consists of a uma_stream_header, followed by a series of
542 * alternative uma_type_header and uma_type_stat structures.
543 */
544#define UMA_STREAM_VERSION 0x00000001
545struct uma_stream_header {
546 u_int32_t ush_version; /* Stream format version. */
547 u_int32_t ush_maxcpus; /* Value of MAXCPU for stream. */
548 u_int32_t ush_count; /* Number of records. */
549 u_int32_t _ush_pad; /* Pad/reserved field. */
550};
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572 u_int32_t uth_zone_flags; /* Zone: flags. */
573 u_int64_t uth_allocs; /* Zone: number of allocations. */
574 u_int64_t uth_frees; /* Zone: number of frees. */
575 u_int64_t uth_fails; /* Zone: number of alloc failures. */
576 u_int64_t _uth_reserved1[3]; /* Reserved. */
577};
578
579struct uma_percpu_stat {
580 u_int64_t ups_allocs; /* Cache: number of allocations. */
581 u_int64_t ups_frees; /* Cache: number of frees. */
582 u_int64_t ups_cache_free; /* Cache: free items in cache. */
583 u_int64_t _ups_reserved[5]; /* Reserved. */
584};
585
586#endif
2 * Copyright (c) 2002, 2003, 2004, 2005 Jeffrey Roberson <jeff@FreeBSD.org>
3 * Copyright (c) 2004, 2005 Bosko Milekic <bmilekic@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
--- 10 unchanged lines hidden (view full) ---
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * $FreeBSD: head/sys/vm/uma.h 184546 2008-11-02 00:41:26Z keramida $
28 *
29 */
30
31/*
32 * uma.h - External definitions for the Universal Memory Allocator
33 *
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 visible 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
--- 45 unchanged lines hidden (view full) ---
96 * flags See zalloc flags
97 *
98 * Returns:
99 * 0 on success
100 * errno on failure
101 *
102 * Discussion:
103 * The initializer is called when the memory is cached in the uma zone.
104 * The initializer and the destructor should leave the object in the same
105 * state.
106 */
107typedef int (*uma_init)(void *mem, int size, int flags);
108
109/*
110 * Item discard function
111 *
112 * Arguments:
113 * item A pointer to memory which has been 'freed' but has not left the
114 * zone's cache.
115 * size The size of the item being discarded.
116 *
117 * Returns:
118 * Nothing
119 *
120 * Discussion:
121 * This routine is called when memory leaves a zone and is returned to the
122 * system for other uses. It is the counter-part to the init function.
123 */
124typedef void (*uma_fini)(void *mem, int size);
125
126/*
127 * What's the difference between initializing and constructing?
128 *
129 * The item is initialized when it is cached, and this is the state that the
130 * object should be in when returned to the allocator. The purpose of this is
131 * to remove some code which would otherwise be called on each allocation by
132 * utilizing a known, stable state. This differs from the constructor which
133 * will be called on EVERY allocation.
134 *
135 * For example, in the initializer you may want to initialize embedded locks,
136 * NULL list pointers, set up initial states, magic numbers, etc. This way if
137 * the object is held in the allocator and re-used it won't be necessary to
138 * re-initialize it.
139 *
140 * The constructor may be used to lock a data structure, link it on to lists,
141 * bump reference counts or total counts of outstanding structures, etc.
142 *
143 */
144
145
146/* Function proto types */
147
148/*
149 * Create a new uma zone
150 *
151 * Arguments:
152 * name The text name of the zone for debugging and stats. This memory
153 * should not be freed until the zone has been deallocated.
154 * size The size of the object that is being created.
155 * ctor The constructor that is called when the object is allocated.
156 * dtor The destructor that is called when the object is freed.
157 * init An initializer that sets up the initial state of the memory.
158 * fini A discard function that undoes initialization done by init.
159 * ctor/dtor/init/fini may all be null, see notes above.
160 * align A bitmask that corresponds to the requested alignment
161 * eg 4 would be 0x3
162 * flags A set of parameters that control the behavior of the zone.
163 *
164 * Returns:
165 * A pointer to a structure which is intended to be opaque to users of
166 * the interface. The value may be null if the wait flag is not set.
167 */
168uma_zone_t uma_zcreate(char *name, size_t size, uma_ctor ctor, uma_dtor dtor,
169 uma_init uminit, uma_fini fini, int align,
170 u_int32_t flags);
171
172/*
173 * Create a secondary uma zone
174 *
175 * Arguments:
176 * name The text name of the zone for debugging and stats. This memory
177 * should not be freed until the zone has been deallocated.
178 * ctor The constructor that is called when the object is allocated.
179 * dtor The destructor that is called when the object is freed.
180 * zinit An initializer that sets up the initial state of the memory
181 * as the object passes from the Keg's slab to the Zone's cache.
182 * zfini A discard function that undoes initialization done by init
183 * as the object passes from the Zone's cache to the Keg's slab.
184 *
185 * ctor/dtor/zinit/zfini may all be null, see notes above.
186 * Note that the zinit and zfini specified here are NOT
--- 21 unchanged lines hidden (view full) ---
208 * Definitions for uma_zcreate flags
209 *
210 * These flags share space with UMA_ZFLAGs in uma_int.h. Be careful not to
211 * overlap when adding new features. 0xf0000000 is in use by uma_int.h.
212 */
213#define UMA_ZONE_PAGEABLE 0x0001 /* Return items not fully backed by
214 physical memory XXX Not yet */
215#define UMA_ZONE_ZINIT 0x0002 /* Initialize with zeros */
216#define UMA_ZONE_STATIC 0x0004 /* Statically sized zone */
217#define UMA_ZONE_OFFPAGE 0x0008 /* Force the slab structure allocation
218 off of the real memory */
219#define UMA_ZONE_MALLOC 0x0010 /* For use by malloc(9) only! */
220#define UMA_ZONE_NOFREE 0x0020 /* Do not free slabs of this type! */
221#define UMA_ZONE_MTXCLASS 0x0040 /* Create a new lock class */
222#define UMA_ZONE_VM 0x0080 /*
223 * Used for internal vm datastructures
224 * only.
--- 27 unchanged lines hidden (view full) ---
252 * Allocates an item out of a zone
253 *
254 * Arguments:
255 * zone The zone we are allocating from
256 * arg This data is passed to the ctor function
257 * flags See sys/malloc.h for available flags.
258 *
259 * Returns:
260 * A non-null pointer to an initialized element from the zone is
261 * guaranteed if the wait flag is M_WAITOK. Otherwise a null pointer
262 * may be returned if the zone is empty or the ctor failed.
263 */
264
265void *uma_zalloc_arg(uma_zone_t zone, void *arg, int flags);
266
267/*
268 * Allocates an item out of a zone without supplying an argument
269 *
270 * This is just a wrapper for uma_zalloc_arg for convenience.
--- 39 unchanged lines hidden (view full) ---
310 * XXX The rest of the prototypes in this header are h0h0 magic for the VM.
311 * If you think you need to use it for a normal zone you're probably incorrect.
312 */
313
314/*
315 * Backend page supplier routines
316 *
317 * Arguments:
318 * zone The zone that is requesting pages.
319 * size The number of bytes being requested.
320 * pflag Flags for these memory pages, see below.
321 * wait Indicates our willingness to block.
322 *
323 * Returns:
324 * A pointer to the allocated memory or NULL on failure.
325 */
326
327typedef void *(*uma_alloc)(uma_zone_t zone, int size, u_int8_t *pflag, int wait);
328
329/*
330 * Backend page free routines
331 *
332 * Arguments:
333 * item A pointer to the previously allocated pages.
334 * size The original size of the allocation.
335 * pflag The flags for the slab. See UMA_SLAB_* below.
336 *
337 * Returns:
338 * None
339 */
340typedef void (*uma_free)(void *item, int size, u_int8_t pflag);
341
342
343
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399 * Nothing
400 */
401void uma_set_align(int align);
402
403/*
404 * Switches the backing object of a zone
405 *
406 * Arguments:
407 * zone The zone to update.
408 * obj The VM object to use for future allocations.
409 * size The size of the object to allocate.
410 *
411 * Returns:
412 * 0 if kva space can not be allocated
413 * 1 if successful
414 *
415 * Discussion:
416 * A NULL object can be used and uma will allocate one for you. Setting
417 * the size will limit the amount of memory allocated to this zone.
--- 13 unchanged lines hidden (view full) ---
431 */
432void uma_zone_set_max(uma_zone_t zone, int nitems);
433
434/*
435 * The following two routines (uma_zone_set_init/fini)
436 * are used to set the backend init/fini pair which acts on an
437 * object as it becomes allocated and is placed in a slab within
438 * the specified zone's backing keg. These should probably not
439 * be changed once allocations have already begun, but only be set
440 * immediately upon zone creation.
441 */
442void uma_zone_set_init(uma_zone_t zone, uma_init uminit);
443void uma_zone_set_fini(uma_zone_t zone, uma_fini fini);
444
445/*
446 * The following two routines (uma_zone_set_zinit/zfini) are
447 * used to set the zinit/zfini pair which acts on an object as
448 * it passes from the backing Keg's slab cache to the
449 * specified Zone's bucket cache. These should probably not
450 * be changed once allocations have already begun, but only be set
451 * immediately upon zone creation.
452 */
453void uma_zone_set_zinit(uma_zone_t zone, uma_init zinit);
454void uma_zone_set_zfini(uma_zone_t zone, uma_fini zfini);
455
456/*
457 * Replaces the standard page_alloc or obj_alloc functions for this zone
458 *
459 * Arguments:
460 * zone The zone whose backend allocator is being changed.
461 * allocf A pointer to the allocation function
462 *
463 * Returns:
464 * Nothing
465 *
466 * Discussion:
467 * This could be used to implement pageable allocation, or perhaps
468 * even DMA allocators if used in conjunction with the OFFPAGE
--- 11 unchanged lines hidden (view full) ---
480 *
481 * Returns:
482 * Nothing
483 */
484
485void uma_zone_set_freef(uma_zone_t zone, uma_free freef);
486
487/*
488 * These flags are setable in the allocf and visible in the freef.
489 */
490#define UMA_SLAB_BOOT 0x01 /* Slab alloced from boot pages */
491#define UMA_SLAB_KMEM 0x02 /* Slab alloced from kmem_map */
492#define UMA_SLAB_KERNEL 0x04 /* Slab alloced from kernel_map */
493#define UMA_SLAB_PRIV 0x08 /* Slab alloced from priv allocator */
494#define UMA_SLAB_OFFP 0x10 /* Slab is managed separately */
495#define UMA_SLAB_MALLOC 0x20 /* Slab is a large malloc slab */
496/* 0x40 and 0x80 are available */
--- 36 unchanged lines hidden (view full) ---
533 * Returns:
534 * Non-zero if zone is exhausted.
535 */
536int uma_zone_exhausted(uma_zone_t zone);
537int uma_zone_exhausted_nolock(uma_zone_t zone);
538
539/*
540 * Exported statistics structures to be used by user space monitoring tools.
541 * Statistics stream consists of a uma_stream_header, followed by a series of
542 * alternative uma_type_header and uma_type_stat structures.
543 */
544#define UMA_STREAM_VERSION 0x00000001
545struct uma_stream_header {
546 u_int32_t ush_version; /* Stream format version. */
547 u_int32_t ush_maxcpus; /* Value of MAXCPU for stream. */
548 u_int32_t ush_count; /* Number of records. */
549 u_int32_t _ush_pad; /* Pad/reserved field. */
550};
--- 21 unchanged lines hidden (view full) ---
572 u_int32_t uth_zone_flags; /* Zone: flags. */
573 u_int64_t uth_allocs; /* Zone: number of allocations. */
574 u_int64_t uth_frees; /* Zone: number of frees. */
575 u_int64_t uth_fails; /* Zone: number of alloc failures. */
576 u_int64_t _uth_reserved1[3]; /* Reserved. */
577};
578
579struct uma_percpu_stat {
580 u_int64_t ups_allocs; /* Cache: number of allocations. */
581 u_int64_t ups_frees; /* Cache: number of frees. */
582 u_int64_t ups_cache_free; /* Cache: free items in cache. */
583 u_int64_t _ups_reserved[5]; /* Reserved. */
584};
585
586#endif