uma.h revision 261724
1139825Simp/*- 2148078Srwatson * Copyright (c) 2002, 2003, 2004, 2005 Jeffrey Roberson <jeff@FreeBSD.org> 3148078Srwatson * Copyright (c) 2004, 2005 Bosko Milekic <bmilekic@FreeBSD.org> 4148078Srwatson * All rights reserved. 592654Sjeff * 692654Sjeff * Redistribution and use in source and binary forms, with or without 792654Sjeff * modification, are permitted provided that the following conditions 892654Sjeff * are met: 992654Sjeff * 1. Redistributions of source code must retain the above copyright 1092654Sjeff * notice unmodified, this list of conditions, and the following 1192654Sjeff * disclaimer. 1292654Sjeff * 2. Redistributions in binary form must reproduce the above copyright 1392654Sjeff * notice, this list of conditions and the following disclaimer in the 1492654Sjeff * documentation and/or other materials provided with the distribution. 1592654Sjeff * 1692654Sjeff * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1792654Sjeff * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1892654Sjeff * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 1992654Sjeff * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 2092654Sjeff * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2192654Sjeff * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2292654Sjeff * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2392654Sjeff * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2492654Sjeff * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2592654Sjeff * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2692654Sjeff * 2792654Sjeff * $FreeBSD: head/sys/vm/uma.h 261724 2014-02-10 19:51:15Z glebius $ 2892654Sjeff * 2992654Sjeff */ 3092654Sjeff 3192654Sjeff/* 3292654Sjeff * uma.h - External definitions for the Universal Memory Allocator 3392654Sjeff * 3492654Sjeff*/ 3592654Sjeff 36261724Sglebius#ifndef _VM_UMA_H_ 37261724Sglebius#define _VM_UMA_H_ 3892654Sjeff 3992654Sjeff#include <sys/param.h> /* For NULL */ 4092654Sjeff#include <sys/malloc.h> /* For M_* */ 4192654Sjeff 42184546Skeramida/* User visible parameters */ 4392654Sjeff#define UMA_SMALLEST_UNIT (PAGE_SIZE / 256) /* Smallest item allocated */ 4492654Sjeff 4592654Sjeff/* Types and type defs */ 4692654Sjeff 47129906Sbmilekicstruct uma_zone; 4892654Sjeff/* Opaque type used as a handle to the zone */ 4992654Sjefftypedef struct uma_zone * uma_zone_t; 5092654Sjeff 51166213Smohansvoid zone_drain(uma_zone_t); 52166213Smohans 53244024Spjd/* 5492654Sjeff * Item constructor 5592654Sjeff * 5692654Sjeff * Arguments: 5792654Sjeff * item A pointer to the memory which has been allocated. 5892654Sjeff * arg The arg field passed to uma_zalloc_arg 5992654Sjeff * size The size of the allocated item 60132987Sgreen * flags See zalloc flags 61244024Spjd * 6292654Sjeff * Returns: 63132987Sgreen * 0 on success 64132987Sgreen * errno on failure 6592654Sjeff * 6692654Sjeff * Discussion: 6792654Sjeff * The constructor is called just before the memory is returned 68105689Ssheldonh * to the user. It may block if necessary. 6992654Sjeff */ 70132987Sgreentypedef int (*uma_ctor)(void *mem, int size, void *arg, int flags); 7192654Sjeff 7292654Sjeff/* 7392654Sjeff * Item destructor 7492654Sjeff * 7592654Sjeff * Arguments: 7692654Sjeff * item A pointer to the memory which has been allocated. 7792654Sjeff * size The size of the item being destructed. 7892654Sjeff * arg Argument passed through uma_zfree_arg 79244024Spjd * 8092654Sjeff * Returns: 8192654Sjeff * Nothing 8292654Sjeff * 8392654Sjeff * Discussion: 8492654Sjeff * The destructor may perform operations that differ from those performed 8592654Sjeff * by the initializer, but it must leave the object in the same state. 8692654Sjeff * This IS type stable storage. This is called after EVERY zfree call. 8792654Sjeff */ 8892654Sjefftypedef void (*uma_dtor)(void *mem, int size, void *arg); 8992654Sjeff 90244024Spjd/* 9192654Sjeff * Item initializer 9292654Sjeff * 9392654Sjeff * Arguments: 9492654Sjeff * item A pointer to the memory which has been allocated. 9592654Sjeff * size The size of the item being initialized. 96132987Sgreen * flags See zalloc flags 97244024Spjd * 9892654Sjeff * Returns: 99132987Sgreen * 0 on success 100132987Sgreen * errno on failure 10192654Sjeff * 10292654Sjeff * Discussion: 103244024Spjd * The initializer is called when the memory is cached in the uma zone. 104184546Skeramida * The initializer and the destructor should leave the object in the same 105184546Skeramida * state. 10692654Sjeff */ 107132987Sgreentypedef int (*uma_init)(void *mem, int size, int flags); 10892654Sjeff 10992654Sjeff/* 11092654Sjeff * Item discard function 11192654Sjeff * 11292654Sjeff * Arguments: 113244024Spjd * item A pointer to memory which has been 'freed' but has not left the 11492654Sjeff * zone's cache. 11592654Sjeff * size The size of the item being discarded. 11692654Sjeff * 11792654Sjeff * Returns: 11892654Sjeff * Nothing 11992654Sjeff * 12092654Sjeff * Discussion: 12192654Sjeff * This routine is called when memory leaves a zone and is returned to the 122184546Skeramida * system for other uses. It is the counter-part to the init function. 12392654Sjeff */ 12492654Sjefftypedef void (*uma_fini)(void *mem, int size); 12592654Sjeff 12692654Sjeff/* 127251826Sjeff * Import new memory into a cache zone. 128251826Sjeff */ 129251826Sjefftypedef int (*uma_import)(void *arg, void **store, int count, int flags); 130251826Sjeff 131251826Sjeff/* 132251826Sjeff * Free memory from a cache zone. 133251826Sjeff */ 134251826Sjefftypedef void (*uma_release)(void *arg, void **store, int count); 135251826Sjeff 136251826Sjeff/* 13792654Sjeff * What's the difference between initializing and constructing? 13892654Sjeff * 139244024Spjd * The item is initialized when it is cached, and this is the state that the 14092654Sjeff * object should be in when returned to the allocator. The purpose of this is 14192654Sjeff * to remove some code which would otherwise be called on each allocation by 14292654Sjeff * utilizing a known, stable state. This differs from the constructor which 14392654Sjeff * will be called on EVERY allocation. 14492654Sjeff * 145184546Skeramida * For example, in the initializer you may want to initialize embedded locks, 14692654Sjeff * NULL list pointers, set up initial states, magic numbers, etc. This way if 147105689Ssheldonh * the object is held in the allocator and re-used it won't be necessary to 14892654Sjeff * re-initialize it. 14992654Sjeff * 15092654Sjeff * The constructor may be used to lock a data structure, link it on to lists, 15192654Sjeff * bump reference counts or total counts of outstanding structures, etc. 15292654Sjeff * 15392654Sjeff */ 15492654Sjeff 15592654Sjeff 15692654Sjeff/* Function proto types */ 15792654Sjeff 15892654Sjeff/* 15992654Sjeff * Create a new uma zone 16092654Sjeff * 16192654Sjeff * Arguments: 162184546Skeramida * name The text name of the zone for debugging and stats. This memory 16392654Sjeff * should not be freed until the zone has been deallocated. 16492654Sjeff * size The size of the object that is being created. 165184546Skeramida * ctor The constructor that is called when the object is allocated. 16692654Sjeff * dtor The destructor that is called when the object is freed. 16792654Sjeff * init An initializer that sets up the initial state of the memory. 16892654Sjeff * fini A discard function that undoes initialization done by init. 16992654Sjeff * ctor/dtor/init/fini may all be null, see notes above. 170184546Skeramida * align A bitmask that corresponds to the requested alignment 17192654Sjeff * eg 4 would be 0x3 172184546Skeramida * flags A set of parameters that control the behavior of the zone. 17392654Sjeff * 17492654Sjeff * Returns: 17592654Sjeff * A pointer to a structure which is intended to be opaque to users of 17692654Sjeff * the interface. The value may be null if the wait flag is not set. 17792654Sjeff */ 178242152Smdfuma_zone_t uma_zcreate(const char *name, size_t size, uma_ctor ctor, 179242152Smdf uma_dtor dtor, uma_init uminit, uma_fini fini, 180249313Sglebius int align, uint32_t flags); 18192654Sjeff 182120223Sjeff/* 183129906Sbmilekic * Create a secondary uma zone 184129906Sbmilekic * 185129906Sbmilekic * Arguments: 186184546Skeramida * name The text name of the zone for debugging and stats. This memory 187129906Sbmilekic * should not be freed until the zone has been deallocated. 188184546Skeramida * ctor The constructor that is called when the object is allocated. 189129906Sbmilekic * dtor The destructor that is called when the object is freed. 190129906Sbmilekic * zinit An initializer that sets up the initial state of the memory 191129906Sbmilekic * as the object passes from the Keg's slab to the Zone's cache. 192129906Sbmilekic * zfini A discard function that undoes initialization done by init 193129906Sbmilekic * as the object passes from the Zone's cache to the Keg's slab. 194129906Sbmilekic * 195129906Sbmilekic * ctor/dtor/zinit/zfini may all be null, see notes above. 196129906Sbmilekic * Note that the zinit and zfini specified here are NOT 197129906Sbmilekic * exactly the same as the init/fini specified to uma_zcreate() 198129906Sbmilekic * when creating a master zone. These zinit/zfini are called 199129906Sbmilekic * on the TRANSITION from keg to zone (and vice-versa). Once 200129906Sbmilekic * these are set, the primary zone may alter its init/fini 201129906Sbmilekic * (which are called when the object passes from VM to keg) 202129906Sbmilekic * using uma_zone_set_init/fini()) as well as its own 203129906Sbmilekic * zinit/zfini (unset by default for master zone) with 204129906Sbmilekic * uma_zone_set_zinit/zfini() (note subtle 'z' prefix). 205129906Sbmilekic * 206129913Sbmilekic * master A reference to this zone's Master Zone (Primary Zone), 207129913Sbmilekic * which contains the backing Keg for the Secondary Zone 208129913Sbmilekic * being added. 209129906Sbmilekic * 210129906Sbmilekic * Returns: 211129906Sbmilekic * A pointer to a structure which is intended to be opaque to users of 212129906Sbmilekic * the interface. The value may be null if the wait flag is not set. 213129906Sbmilekic */ 214129906Sbmilekicuma_zone_t uma_zsecond_create(char *name, uma_ctor ctor, uma_dtor dtor, 215129906Sbmilekic uma_init zinit, uma_fini zfini, uma_zone_t master); 216129906Sbmilekic 217129906Sbmilekic/* 218187681Sjeff * Add a second master to a secondary zone. This provides multiple data 219187681Sjeff * backends for objects with the same size. Both masters must have 220187681Sjeff * compatible allocation flags. Presently, UMA_ZONE_MALLOC type zones are 221187681Sjeff * the only supported. 222187681Sjeff * 223187681Sjeff * Returns: 224244024Spjd * Error on failure, 0 on success. 225187681Sjeff */ 226187681Sjeffint uma_zsecond_add(uma_zone_t zone, uma_zone_t master); 227187681Sjeff 228187681Sjeff/* 229251826Sjeff * Create cache-only zones. 230251826Sjeff * 231251826Sjeff * This allows uma's per-cpu cache facilities to handle arbitrary 232251826Sjeff * pointers. Consumers must specify the import and release functions to 233251826Sjeff * fill and destroy caches. UMA does not allocate any memory for these 234251826Sjeff * zones. The 'arg' parameter is passed to import/release and is caller 235251826Sjeff * specific. 236251826Sjeff */ 237252040Sjeffuma_zone_t uma_zcache_create(char *name, int size, uma_ctor ctor, uma_dtor dtor, 238251826Sjeff uma_init zinit, uma_fini zfini, uma_import zimport, 239251826Sjeff uma_release zrelease, void *arg, int flags); 240251826Sjeff 241251826Sjeff/* 242120223Sjeff * Definitions for uma_zcreate flags 243120223Sjeff * 244120223Sjeff * These flags share space with UMA_ZFLAGs in uma_int.h. Be careful not to 245148072Ssilby * overlap when adding new features. 0xf0000000 is in use by uma_int.h. 246120223Sjeff */ 24792654Sjeff#define UMA_ZONE_PAGEABLE 0x0001 /* Return items not fully backed by 24892654Sjeff physical memory XXX Not yet */ 24992654Sjeff#define UMA_ZONE_ZINIT 0x0002 /* Initialize with zeros */ 250184546Skeramida#define UMA_ZONE_STATIC 0x0004 /* Statically sized zone */ 25192654Sjeff#define UMA_ZONE_OFFPAGE 0x0008 /* Force the slab structure allocation 25292654Sjeff off of the real memory */ 25392654Sjeff#define UMA_ZONE_MALLOC 0x0010 /* For use by malloc(9) only! */ 25492654Sjeff#define UMA_ZONE_NOFREE 0x0020 /* Do not free slabs of this type! */ 25595758Sjeff#define UMA_ZONE_MTXCLASS 0x0040 /* Create a new lock class */ 256103531Sjeff#define UMA_ZONE_VM 0x0080 /* 257103531Sjeff * Used for internal vm datastructures 258103531Sjeff * only. 259103531Sjeff */ 260103531Sjeff#define UMA_ZONE_HASH 0x0100 /* 261103531Sjeff * Use a hash table instead of caching 262103531Sjeff * information in the vm_page. 263103531Sjeff */ 264129906Sbmilekic#define UMA_ZONE_SECONDARY 0x0200 /* Zone is a Secondary Zone */ 265129906Sbmilekic#define UMA_ZONE_REFCNT 0x0400 /* Allocate refcnts in slabs */ 266129906Sbmilekic#define UMA_ZONE_MAXBUCKET 0x0800 /* Use largest buckets */ 267187681Sjeff#define UMA_ZONE_CACHESPREAD 0x1000 /* 268187681Sjeff * Spread memory start locations across 269187681Sjeff * all possible cache lines. May 270187681Sjeff * require many virtually contiguous 271187681Sjeff * backend pages and can fail early. 272187681Sjeff */ 273187681Sjeff#define UMA_ZONE_VTOSLAB 0x2000 /* Zone uses vtoslab for lookup. */ 274230623Skmacy#define UMA_ZONE_NODUMP 0x4000 /* 275230623Skmacy * Zone's pages will not be included in 276230623Skmacy * mini-dumps. 277230623Skmacy */ 278249264Sglebius#define UMA_ZONE_PCPU 0x8000 /* 279249264Sglebius * Allocates mp_ncpus slabs sized to 280249264Sglebius * sizeof(struct pcpu). 281249264Sglebius */ 28292654Sjeff 283187681Sjeff/* 284187681Sjeff * These flags are shared between the keg and zone. In zones wishing to add 285187681Sjeff * new kegs these flags must be compatible. Some are determined based on 286187681Sjeff * physical parameters of the request and may not be provided by the consumer. 287187681Sjeff */ 288187681Sjeff#define UMA_ZONE_INHERIT \ 289226313Sglebius (UMA_ZONE_OFFPAGE | UMA_ZONE_MALLOC | UMA_ZONE_NOFREE | \ 290249264Sglebius UMA_ZONE_HASH | UMA_ZONE_REFCNT | UMA_ZONE_VTOSLAB | UMA_ZONE_PCPU) 291187681Sjeff 29292654Sjeff/* Definitions for align */ 29392654Sjeff#define UMA_ALIGN_PTR (sizeof(void *) - 1) /* Alignment fit for ptr */ 29492654Sjeff#define UMA_ALIGN_LONG (sizeof(long) - 1) /* "" long */ 29592654Sjeff#define UMA_ALIGN_INT (sizeof(int) - 1) /* "" int */ 29692654Sjeff#define UMA_ALIGN_SHORT (sizeof(short) - 1) /* "" short */ 29792654Sjeff#define UMA_ALIGN_CHAR (sizeof(char) - 1) /* "" char */ 298166654Srwatson#define UMA_ALIGN_CACHE (0 - 1) /* Cache line size align */ 29992654Sjeff 30092654Sjeff/* 30194161Sjeff * Destroys an empty uma zone. If the zone is not empty uma complains loudly. 30292654Sjeff * 30392654Sjeff * Arguments: 30492654Sjeff * zone The zone we want to destroy. 30592654Sjeff * 30692654Sjeff */ 30794161Sjeffvoid uma_zdestroy(uma_zone_t zone); 30892654Sjeff 30992654Sjeff/* 31092654Sjeff * Allocates an item out of a zone 31192654Sjeff * 31292654Sjeff * Arguments: 31392654Sjeff * zone The zone we are allocating from 31492654Sjeff * arg This data is passed to the ctor function 31595766Sjeff * flags See sys/malloc.h for available flags. 31692654Sjeff * 31792654Sjeff * Returns: 318184546Skeramida * A non-null pointer to an initialized element from the zone is 319184546Skeramida * guaranteed if the wait flag is M_WAITOK. Otherwise a null pointer 320184546Skeramida * may be returned if the zone is empty or the ctor failed. 32192654Sjeff */ 32292654Sjeff 32395766Sjeffvoid *uma_zalloc_arg(uma_zone_t zone, void *arg, int flags); 32492654Sjeff 32592654Sjeff/* 32692654Sjeff * Allocates an item out of a zone without supplying an argument 32792654Sjeff * 32892654Sjeff * This is just a wrapper for uma_zalloc_arg for convenience. 32992654Sjeff * 33092654Sjeff */ 33195766Sjeffstatic __inline void *uma_zalloc(uma_zone_t zone, int flags); 33292654Sjeff 33392654Sjeffstatic __inline void * 33495766Sjeffuma_zalloc(uma_zone_t zone, int flags) 33592654Sjeff{ 33695766Sjeff return uma_zalloc_arg(zone, NULL, flags); 33792654Sjeff} 33892654Sjeff 33992654Sjeff/* 34092654Sjeff * Frees an item back into the specified zone. 34192654Sjeff * 34292654Sjeff * Arguments: 34392654Sjeff * zone The zone the item was originally allocated out of. 34492654Sjeff * item The memory to be freed. 34592654Sjeff * arg Argument passed to the destructor 34692654Sjeff * 34792654Sjeff * Returns: 34892654Sjeff * Nothing. 34992654Sjeff */ 35092654Sjeff 35192654Sjeffvoid uma_zfree_arg(uma_zone_t zone, void *item, void *arg); 35292654Sjeff 35392654Sjeff/* 35492654Sjeff * Frees an item back to a zone without supplying an argument 35592654Sjeff * 35692654Sjeff * This is just a wrapper for uma_zfree_arg for convenience. 35792654Sjeff * 35892654Sjeff */ 35992654Sjeffstatic __inline void uma_zfree(uma_zone_t zone, void *item); 36092654Sjeff 36192654Sjeffstatic __inline void 36292654Sjeffuma_zfree(uma_zone_t zone, void *item) 36392654Sjeff{ 364100326Smarkm uma_zfree_arg(zone, item, NULL); 36592654Sjeff} 36692654Sjeff 36792654Sjeff/* 36892654Sjeff * XXX The rest of the prototypes in this header are h0h0 magic for the VM. 36992654Sjeff * If you think you need to use it for a normal zone you're probably incorrect. 37092654Sjeff */ 37192654Sjeff 37292654Sjeff/* 37392654Sjeff * Backend page supplier routines 37492654Sjeff * 37592654Sjeff * Arguments: 376184546Skeramida * zone The zone that is requesting pages. 377184546Skeramida * size The number of bytes being requested. 37892654Sjeff * pflag Flags for these memory pages, see below. 37992654Sjeff * wait Indicates our willingness to block. 38092654Sjeff * 38192654Sjeff * Returns: 382184546Skeramida * A pointer to the allocated memory or NULL on failure. 38392654Sjeff */ 38492654Sjeff 385249313Sglebiustypedef void *(*uma_alloc)(uma_zone_t zone, int size, uint8_t *pflag, int wait); 38692654Sjeff 38792654Sjeff/* 38892654Sjeff * Backend page free routines 38992654Sjeff * 39092654Sjeff * Arguments: 391184546Skeramida * item A pointer to the previously allocated pages. 392184546Skeramida * size The original size of the allocation. 393184546Skeramida * pflag The flags for the slab. See UMA_SLAB_* below. 39492654Sjeff * 39592654Sjeff * Returns: 39692654Sjeff * None 39792654Sjeff */ 398249313Sglebiustypedef void (*uma_free)(void *item, int size, uint8_t pflag); 39992654Sjeff 40092654Sjeff 40192654Sjeff 40292654Sjeff/* 40392654Sjeff * Sets up the uma allocator. (Called by vm_mem_init) 40492654Sjeff * 40592654Sjeff * Arguments: 40692654Sjeff * bootmem A pointer to memory used to bootstrap the system. 40792654Sjeff * 40892654Sjeff * Returns: 40992654Sjeff * Nothing 41092654Sjeff * 41192654Sjeff * Discussion: 41292654Sjeff * This memory is used for zones which allocate things before the 41392654Sjeff * backend page supplier can give us pages. It should be 414151104Sdes * UMA_SLAB_SIZE * boot_pages bytes. (see uma_int.h) 41592654Sjeff * 41692654Sjeff */ 41792654Sjeff 418151104Sdesvoid uma_startup(void *bootmem, int boot_pages); 41992654Sjeff 42092654Sjeff/* 42192654Sjeff * Finishes starting up the allocator. This should 42292654Sjeff * be called when kva is ready for normal allocs. 42392654Sjeff * 42492654Sjeff * Arguments: 425103531Sjeff * None 42692654Sjeff * 42792654Sjeff * Returns: 42892654Sjeff * Nothing 42992654Sjeff * 43092654Sjeff * Discussion: 431103531Sjeff * uma_startup2 is called by kmeminit() to enable us of uma for malloc. 43292654Sjeff */ 433244024Spjd 434103531Sjeffvoid uma_startup2(void); 43592654Sjeff 43692654Sjeff/* 43792654Sjeff * Reclaims unused memory for all zones 43892654Sjeff * 43992654Sjeff * Arguments: 44092654Sjeff * None 44192654Sjeff * Returns: 44292654Sjeff * None 44392654Sjeff * 44492654Sjeff * This should only be called by the page out daemon. 44592654Sjeff */ 44692654Sjeff 44792654Sjeffvoid uma_reclaim(void); 44892654Sjeff 44992654Sjeff/* 450166654Srwatson * Sets the alignment mask to be used for all zones requesting cache 451166654Srwatson * alignment. Should be called by MD boot code prior to starting VM/UMA. 452166654Srwatson * 453166654Srwatson * Arguments: 454166654Srwatson * align The alignment mask 455166654Srwatson * 456166654Srwatson * Returns: 457166654Srwatson * Nothing 458166654Srwatson */ 459166654Srwatsonvoid uma_set_align(int align); 460166654Srwatson 461166654Srwatson/* 462252226Sjeff * Set a reserved number of items to hold for M_USE_RESERVE allocations. All 463252226Sjeff * other requests must allocate new backing pages. 464252226Sjeff */ 465252226Sjeffvoid uma_zone_reserve(uma_zone_t zone, int nitems); 466252226Sjeff 467252226Sjeff/* 468247360Sattilio * Reserves the maximum KVA space required by the zone and configures the zone 469247360Sattilio * to use a VM_ALLOC_NOOBJ-based backend allocator. 47092654Sjeff * 47192654Sjeff * Arguments: 472184546Skeramida * zone The zone to update. 473247360Sattilio * nitems The upper limit on the number of items that can be allocated. 47492654Sjeff * 47592654Sjeff * Returns: 476247360Sattilio * 0 if KVA space can not be allocated 47792654Sjeff * 1 if successful 47892654Sjeff * 47992654Sjeff * Discussion: 480247360Sattilio * When the machine supports a direct map and the zone's items are smaller 481247360Sattilio * than a page, the zone will use the direct map instead of allocating KVA 482247360Sattilio * space. 48392654Sjeff */ 484247360Sattilioint uma_zone_reserve_kva(uma_zone_t zone, int nitems); 48592654Sjeff 48692758Sjeff/* 48792758Sjeff * Sets a high limit on the number of items allowed in a zone 48892758Sjeff * 48992758Sjeff * Arguments: 49092758Sjeff * zone The zone to limit 491213911Slstewart * nitems The requested upper limit on the number of items allowed 49292758Sjeff * 49392758Sjeff * Returns: 494213911Slstewart * int The effective value of nitems after rounding up based on page size 49592758Sjeff */ 496213911Slstewartint uma_zone_set_max(uma_zone_t zone, int nitems); 49792654Sjeff 49892654Sjeff/* 499211396Sandre * Obtains the effective limit on the number of items in a zone 500211396Sandre * 501211396Sandre * Arguments: 502211396Sandre * zone The zone to obtain the effective limit from 503211396Sandre * 504211396Sandre * Return: 505211396Sandre * 0 No limit 506211396Sandre * int The effective limit of the zone 507211396Sandre */ 508211396Sandreint uma_zone_get_max(uma_zone_t zone); 509211396Sandre 510211396Sandre/* 511243998Spjd * Sets a warning to be printed when limit is reached 512243998Spjd * 513243998Spjd * Arguments: 514243998Spjd * zone The zone we will warn about 515243998Spjd * warning Warning content 516243998Spjd * 517243998Spjd * Returns: 518243998Spjd * Nothing 519243998Spjd */ 520243998Spjdvoid uma_zone_set_warning(uma_zone_t zone, const char *warning); 521243998Spjd 522243998Spjd/* 523213910Slstewart * Obtains the approximate current number of items allocated from a zone 524213910Slstewart * 525213910Slstewart * Arguments: 526213910Slstewart * zone The zone to obtain the current allocation count from 527213910Slstewart * 528213910Slstewart * Return: 529213910Slstewart * int The approximate current number of items allocated from the zone 530213910Slstewart */ 531213910Slstewartint uma_zone_get_cur(uma_zone_t zone); 532213910Slstewart 533213910Slstewart/* 534129906Sbmilekic * The following two routines (uma_zone_set_init/fini) 535129906Sbmilekic * are used to set the backend init/fini pair which acts on an 536129906Sbmilekic * object as it becomes allocated and is placed in a slab within 537129906Sbmilekic * the specified zone's backing keg. These should probably not 538184546Skeramida * be changed once allocations have already begun, but only be set 539129906Sbmilekic * immediately upon zone creation. 540129906Sbmilekic */ 541129906Sbmilekicvoid uma_zone_set_init(uma_zone_t zone, uma_init uminit); 542129906Sbmilekicvoid uma_zone_set_fini(uma_zone_t zone, uma_fini fini); 543129906Sbmilekic 544129906Sbmilekic/* 545129906Sbmilekic * The following two routines (uma_zone_set_zinit/zfini) are 546129906Sbmilekic * used to set the zinit/zfini pair which acts on an object as 547129906Sbmilekic * it passes from the backing Keg's slab cache to the 548129906Sbmilekic * specified Zone's bucket cache. These should probably not 549184546Skeramida * be changed once allocations have already begun, but only be set 550184546Skeramida * immediately upon zone creation. 551129906Sbmilekic */ 552129906Sbmilekicvoid uma_zone_set_zinit(uma_zone_t zone, uma_init zinit); 553129906Sbmilekicvoid uma_zone_set_zfini(uma_zone_t zone, uma_fini zfini); 554129906Sbmilekic 555129906Sbmilekic/* 556247360Sattilio * Replaces the standard backend allocator for this zone. 55792654Sjeff * 55892654Sjeff * Arguments: 559184546Skeramida * zone The zone whose backend allocator is being changed. 56092654Sjeff * allocf A pointer to the allocation function 56192654Sjeff * 56292654Sjeff * Returns: 56392654Sjeff * Nothing 56492654Sjeff * 56592654Sjeff * Discussion: 56692654Sjeff * This could be used to implement pageable allocation, or perhaps 56792654Sjeff * even DMA allocators if used in conjunction with the OFFPAGE 56892654Sjeff * zone flag. 56992654Sjeff */ 57092654Sjeff 57192654Sjeffvoid uma_zone_set_allocf(uma_zone_t zone, uma_alloc allocf); 57292654Sjeff 57392654Sjeff/* 57492654Sjeff * Used for freeing memory provided by the allocf above 57592654Sjeff * 57692654Sjeff * Arguments: 57792654Sjeff * zone The zone that intends to use this free routine. 57892654Sjeff * freef The page freeing routine. 57992654Sjeff * 58092654Sjeff * Returns: 58192654Sjeff * Nothing 58292654Sjeff */ 58392654Sjeff 58492654Sjeffvoid uma_zone_set_freef(uma_zone_t zone, uma_free freef); 58592654Sjeff 58692654Sjeff/* 587184546Skeramida * These flags are setable in the allocf and visible in the freef. 58892654Sjeff */ 58992654Sjeff#define UMA_SLAB_BOOT 0x01 /* Slab alloced from boot pages */ 59092654Sjeff#define UMA_SLAB_KMEM 0x02 /* Slab alloced from kmem_map */ 591177921Salc#define UMA_SLAB_KERNEL 0x04 /* Slab alloced from kernel_map */ 59292654Sjeff#define UMA_SLAB_PRIV 0x08 /* Slab alloced from priv allocator */ 59394157Sjeff#define UMA_SLAB_OFFP 0x10 /* Slab is managed separately */ 59492654Sjeff#define UMA_SLAB_MALLOC 0x20 /* Slab is a large malloc slab */ 59592654Sjeff/* 0x40 and 0x80 are available */ 59692654Sjeff 59792654Sjeff/* 59892654Sjeff * Used to pre-fill a zone with some number of items 59992654Sjeff * 60092654Sjeff * Arguments: 60192654Sjeff * zone The zone to fill 60292654Sjeff * itemcnt The number of items to reserve 60392654Sjeff * 60492654Sjeff * Returns: 60592654Sjeff * Nothing 60692654Sjeff * 60792654Sjeff * NOTE: This is blocking and should only be done at startup 60892654Sjeff */ 60992654Sjeffvoid uma_prealloc(uma_zone_t zone, int itemcnt); 61092654Sjeff 611129906Sbmilekic/* 612129906Sbmilekic * Used to lookup the reference counter allocated for an item 613129906Sbmilekic * from a UMA_ZONE_REFCNT zone. For UMA_ZONE_REFCNT zones, 614129906Sbmilekic * reference counters are allocated for items and stored in 615129906Sbmilekic * the underlying slab header. 616129906Sbmilekic * 617129906Sbmilekic * Arguments: 618244024Spjd * zone The UMA_ZONE_REFCNT zone to which the item belongs. 619129906Sbmilekic * item The address of the item for which we want a refcnt. 620129906Sbmilekic * 621129906Sbmilekic * Returns: 622249313Sglebius * A pointer to a uint32_t reference counter. 623129906Sbmilekic */ 624249313Sglebiusuint32_t *uma_find_refcnt(uma_zone_t zone, void *item); 62592654Sjeff 626147996Srwatson/* 627165809Sjhb * Used to determine if a fixed-size zone is exhausted. 628165809Sjhb * 629165809Sjhb * Arguments: 630165809Sjhb * zone The zone to check 631165809Sjhb * 632165809Sjhb * Returns: 633244024Spjd * Non-zero if zone is exhausted. 634165809Sjhb */ 635165809Sjhbint uma_zone_exhausted(uma_zone_t zone); 636166213Smohansint uma_zone_exhausted_nolock(uma_zone_t zone); 637165809Sjhb 638165809Sjhb/* 639147996Srwatson * Exported statistics structures to be used by user space monitoring tools. 640184546Skeramida * Statistics stream consists of a uma_stream_header, followed by a series of 641184546Skeramida * alternative uma_type_header and uma_type_stat structures. 642147996Srwatson */ 643147996Srwatson#define UMA_STREAM_VERSION 0x00000001 644147996Srwatsonstruct uma_stream_header { 645249313Sglebius uint32_t ush_version; /* Stream format version. */ 646249313Sglebius uint32_t ush_maxcpus; /* Value of MAXCPU for stream. */ 647249313Sglebius uint32_t ush_count; /* Number of records. */ 648249313Sglebius uint32_t _ush_pad; /* Pad/reserved field. */ 649147996Srwatson}; 650147996Srwatson 651148371Srwatson#define UTH_MAX_NAME 32 652148371Srwatson#define UTH_ZONE_SECONDARY 0x00000001 653147996Srwatsonstruct uma_type_header { 654147996Srwatson /* 655147996Srwatson * Static per-zone data, some extracted from the supporting keg. 656147996Srwatson */ 657148371Srwatson char uth_name[UTH_MAX_NAME]; 658249313Sglebius uint32_t uth_align; /* Keg: alignment. */ 659249313Sglebius uint32_t uth_size; /* Keg: requested size of item. */ 660249313Sglebius uint32_t uth_rsize; /* Keg: real size of item. */ 661249313Sglebius uint32_t uth_maxpages; /* Keg: maximum number of pages. */ 662249313Sglebius uint32_t uth_limit; /* Keg: max items to allocate. */ 663147996Srwatson 664147996Srwatson /* 665147996Srwatson * Current dynamic zone/keg-derived statistics. 666147996Srwatson */ 667249313Sglebius uint32_t uth_pages; /* Keg: pages allocated. */ 668249313Sglebius uint32_t uth_keg_free; /* Keg: items free. */ 669249313Sglebius uint32_t uth_zone_free; /* Zone: items free. */ 670249313Sglebius uint32_t uth_bucketsize; /* Zone: desired bucket size. */ 671249313Sglebius uint32_t uth_zone_flags; /* Zone: flags. */ 672249313Sglebius uint64_t uth_allocs; /* Zone: number of allocations. */ 673249313Sglebius uint64_t uth_frees; /* Zone: number of frees. */ 674249313Sglebius uint64_t uth_fails; /* Zone: number of alloc failures. */ 675249313Sglebius uint64_t uth_sleeps; /* Zone: number of alloc sleeps. */ 676249313Sglebius uint64_t _uth_reserved1[2]; /* Reserved. */ 677147996Srwatson}; 678147996Srwatson 679147996Srwatsonstruct uma_percpu_stat { 680249313Sglebius uint64_t ups_allocs; /* Cache: number of allocations. */ 681249313Sglebius uint64_t ups_frees; /* Cache: number of frees. */ 682249313Sglebius uint64_t ups_cache_free; /* Cache: free items in cache. */ 683249313Sglebius uint64_t _ups_reserved[5]; /* Reserved. */ 684147996Srwatson}; 685147996Srwatson 686261724Sglebius#endif /* _VM_UMA_H_ */ 687