3803b26bae
still uses the constant UMA_BOOT_PAGES. Change it to accept boot_pages as an additional argument. MFC after: 2 weeks
560 lines
17 KiB
C
560 lines
17 KiB
C
/*-
|
|
* Copyright (c) 2002, 2003, 2004, 2005 Jeffrey Roberson <jeff@FreeBSD.org>
|
|
* Copyright (c) 2004, 2005 Bosko Milekic <bmilekic@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice unmodified, this list of conditions, and the following
|
|
* disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* uma.h - External definitions for the Universal Memory Allocator
|
|
*
|
|
*/
|
|
|
|
#ifndef VM_UMA_H
|
|
#define VM_UMA_H
|
|
|
|
#include <sys/param.h> /* For NULL */
|
|
#include <sys/malloc.h> /* For M_* */
|
|
|
|
/* User visable parameters */
|
|
#define UMA_SMALLEST_UNIT (PAGE_SIZE / 256) /* Smallest item allocated */
|
|
|
|
/* Types and type defs */
|
|
|
|
struct uma_zone;
|
|
/* Opaque type used as a handle to the zone */
|
|
typedef struct uma_zone * uma_zone_t;
|
|
|
|
/*
|
|
* Item constructor
|
|
*
|
|
* Arguments:
|
|
* item A pointer to the memory which has been allocated.
|
|
* arg The arg field passed to uma_zalloc_arg
|
|
* size The size of the allocated item
|
|
* flags See zalloc flags
|
|
*
|
|
* Returns:
|
|
* 0 on success
|
|
* errno on failure
|
|
*
|
|
* Discussion:
|
|
* The constructor is called just before the memory is returned
|
|
* to the user. It may block if necessary.
|
|
*/
|
|
typedef int (*uma_ctor)(void *mem, int size, void *arg, int flags);
|
|
|
|
/*
|
|
* Item destructor
|
|
*
|
|
* Arguments:
|
|
* item A pointer to the memory which has been allocated.
|
|
* size The size of the item being destructed.
|
|
* arg Argument passed through uma_zfree_arg
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*
|
|
* Discussion:
|
|
* The destructor may perform operations that differ from those performed
|
|
* by the initializer, but it must leave the object in the same state.
|
|
* This IS type stable storage. This is called after EVERY zfree call.
|
|
*/
|
|
typedef void (*uma_dtor)(void *mem, int size, void *arg);
|
|
|
|
/*
|
|
* Item initializer
|
|
*
|
|
* Arguments:
|
|
* item A pointer to the memory which has been allocated.
|
|
* size The size of the item being initialized.
|
|
* flags See zalloc flags
|
|
*
|
|
* Returns:
|
|
* 0 on success
|
|
* errno on failure
|
|
*
|
|
* Discussion:
|
|
* The initializer is called when the memory is cached in the uma zone.
|
|
* this should be the same state that the destructor leaves the object in.
|
|
*/
|
|
typedef int (*uma_init)(void *mem, int size, int flags);
|
|
|
|
/*
|
|
* Item discard function
|
|
*
|
|
* Arguments:
|
|
* item A pointer to memory which has been 'freed' but has not left the
|
|
* zone's cache.
|
|
* size The size of the item being discarded.
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*
|
|
* Discussion:
|
|
* This routine is called when memory leaves a zone and is returned to the
|
|
* system for other uses. It is the counter part to the init function.
|
|
*/
|
|
typedef void (*uma_fini)(void *mem, int size);
|
|
|
|
/*
|
|
* What's the difference between initializing and constructing?
|
|
*
|
|
* The item is initialized when it is cached, and this is the state that the
|
|
* object should be in when returned to the allocator. The purpose of this is
|
|
* to remove some code which would otherwise be called on each allocation by
|
|
* utilizing a known, stable state. This differs from the constructor which
|
|
* will be called on EVERY allocation.
|
|
*
|
|
* For example, in the initializer you may want to initialize embeded locks,
|
|
* NULL list pointers, set up initial states, magic numbers, etc. This way if
|
|
* the object is held in the allocator and re-used it won't be necessary to
|
|
* re-initialize it.
|
|
*
|
|
* The constructor may be used to lock a data structure, link it on to lists,
|
|
* bump reference counts or total counts of outstanding structures, etc.
|
|
*
|
|
*/
|
|
|
|
|
|
/* Function proto types */
|
|
|
|
/*
|
|
* Create a new uma zone
|
|
*
|
|
* Arguments:
|
|
* name The text name of the zone for debugging and stats, this memory
|
|
* should not be freed until the zone has been deallocated.
|
|
* size The size of the object that is being created.
|
|
* ctor The constructor that is called when the object is allocated
|
|
* dtor The destructor that is called when the object is freed.
|
|
* init An initializer that sets up the initial state of the memory.
|
|
* fini A discard function that undoes initialization done by init.
|
|
* ctor/dtor/init/fini may all be null, see notes above.
|
|
* align A bitmask that corisponds to the requested alignment
|
|
* eg 4 would be 0x3
|
|
* flags A set of parameters that control the behavior of the zone
|
|
*
|
|
* Returns:
|
|
* A pointer to a structure which is intended to be opaque to users of
|
|
* the interface. The value may be null if the wait flag is not set.
|
|
*/
|
|
uma_zone_t uma_zcreate(char *name, size_t size, uma_ctor ctor, uma_dtor dtor,
|
|
uma_init uminit, uma_fini fini, int align,
|
|
u_int32_t flags);
|
|
|
|
/*
|
|
* Create a secondary uma zone
|
|
*
|
|
* Arguments:
|
|
* name The text name of the zone for debugging and stats, this memory
|
|
* should not be freed until the zone has been deallocated.
|
|
* ctor The constructor that is called when the object is allocated
|
|
* dtor The destructor that is called when the object is freed.
|
|
* zinit An initializer that sets up the initial state of the memory
|
|
* as the object passes from the Keg's slab to the Zone's cache.
|
|
* zfini A discard function that undoes initialization done by init
|
|
* as the object passes from the Zone's cache to the Keg's slab.
|
|
*
|
|
* ctor/dtor/zinit/zfini may all be null, see notes above.
|
|
* Note that the zinit and zfini specified here are NOT
|
|
* exactly the same as the init/fini specified to uma_zcreate()
|
|
* when creating a master zone. These zinit/zfini are called
|
|
* on the TRANSITION from keg to zone (and vice-versa). Once
|
|
* these are set, the primary zone may alter its init/fini
|
|
* (which are called when the object passes from VM to keg)
|
|
* using uma_zone_set_init/fini()) as well as its own
|
|
* zinit/zfini (unset by default for master zone) with
|
|
* uma_zone_set_zinit/zfini() (note subtle 'z' prefix).
|
|
*
|
|
* master A reference to this zone's Master Zone (Primary Zone),
|
|
* which contains the backing Keg for the Secondary Zone
|
|
* being added.
|
|
*
|
|
* Returns:
|
|
* A pointer to a structure which is intended to be opaque to users of
|
|
* the interface. The value may be null if the wait flag is not set.
|
|
*/
|
|
uma_zone_t uma_zsecond_create(char *name, uma_ctor ctor, uma_dtor dtor,
|
|
uma_init zinit, uma_fini zfini, uma_zone_t master);
|
|
|
|
/*
|
|
* Definitions for uma_zcreate flags
|
|
*
|
|
* These flags share space with UMA_ZFLAGs in uma_int.h. Be careful not to
|
|
* overlap when adding new features. 0xf0000000 is in use by uma_int.h.
|
|
*/
|
|
#define UMA_ZONE_PAGEABLE 0x0001 /* Return items not fully backed by
|
|
physical memory XXX Not yet */
|
|
#define UMA_ZONE_ZINIT 0x0002 /* Initialize with zeros */
|
|
#define UMA_ZONE_STATIC 0x0004 /* Staticly sized zone */
|
|
#define UMA_ZONE_OFFPAGE 0x0008 /* Force the slab structure allocation
|
|
off of the real memory */
|
|
#define UMA_ZONE_MALLOC 0x0010 /* For use by malloc(9) only! */
|
|
#define UMA_ZONE_NOFREE 0x0020 /* Do not free slabs of this type! */
|
|
#define UMA_ZONE_MTXCLASS 0x0040 /* Create a new lock class */
|
|
#define UMA_ZONE_VM 0x0080 /*
|
|
* Used for internal vm datastructures
|
|
* only.
|
|
*/
|
|
#define UMA_ZONE_HASH 0x0100 /*
|
|
* Use a hash table instead of caching
|
|
* information in the vm_page.
|
|
*/
|
|
#define UMA_ZONE_SECONDARY 0x0200 /* Zone is a Secondary Zone */
|
|
#define UMA_ZONE_REFCNT 0x0400 /* Allocate refcnts in slabs */
|
|
#define UMA_ZONE_MAXBUCKET 0x0800 /* Use largest buckets */
|
|
|
|
/* Definitions for align */
|
|
#define UMA_ALIGN_PTR (sizeof(void *) - 1) /* Alignment fit for ptr */
|
|
#define UMA_ALIGN_LONG (sizeof(long) - 1) /* "" long */
|
|
#define UMA_ALIGN_INT (sizeof(int) - 1) /* "" int */
|
|
#define UMA_ALIGN_SHORT (sizeof(short) - 1) /* "" short */
|
|
#define UMA_ALIGN_CHAR (sizeof(char) - 1) /* "" char */
|
|
#define UMA_ALIGN_CACHE (16 - 1) /* Cache line size align */
|
|
|
|
/*
|
|
* Destroys an empty uma zone. If the zone is not empty uma complains loudly.
|
|
*
|
|
* Arguments:
|
|
* zone The zone we want to destroy.
|
|
*
|
|
*/
|
|
void uma_zdestroy(uma_zone_t zone);
|
|
|
|
/*
|
|
* Allocates an item out of a zone
|
|
*
|
|
* Arguments:
|
|
* zone The zone we are allocating from
|
|
* arg This data is passed to the ctor function
|
|
* flags See sys/malloc.h for available flags.
|
|
*
|
|
* Returns:
|
|
* A non null pointer to an initialized element from the zone is
|
|
* garanteed if the wait flag is M_WAITOK, otherwise a null pointer may be
|
|
* returned if the zone is empty or the ctor failed.
|
|
*/
|
|
|
|
void *uma_zalloc_arg(uma_zone_t zone, void *arg, int flags);
|
|
|
|
/*
|
|
* Allocates an item out of a zone without supplying an argument
|
|
*
|
|
* This is just a wrapper for uma_zalloc_arg for convenience.
|
|
*
|
|
*/
|
|
static __inline void *uma_zalloc(uma_zone_t zone, int flags);
|
|
|
|
static __inline void *
|
|
uma_zalloc(uma_zone_t zone, int flags)
|
|
{
|
|
return uma_zalloc_arg(zone, NULL, flags);
|
|
}
|
|
|
|
/*
|
|
* Frees an item back into the specified zone.
|
|
*
|
|
* Arguments:
|
|
* zone The zone the item was originally allocated out of.
|
|
* item The memory to be freed.
|
|
* arg Argument passed to the destructor
|
|
*
|
|
* Returns:
|
|
* Nothing.
|
|
*/
|
|
|
|
void uma_zfree_arg(uma_zone_t zone, void *item, void *arg);
|
|
|
|
/*
|
|
* Frees an item back to a zone without supplying an argument
|
|
*
|
|
* This is just a wrapper for uma_zfree_arg for convenience.
|
|
*
|
|
*/
|
|
static __inline void uma_zfree(uma_zone_t zone, void *item);
|
|
|
|
static __inline void
|
|
uma_zfree(uma_zone_t zone, void *item)
|
|
{
|
|
uma_zfree_arg(zone, item, NULL);
|
|
}
|
|
|
|
/*
|
|
* XXX The rest of the prototypes in this header are h0h0 magic for the VM.
|
|
* If you think you need to use it for a normal zone you're probably incorrect.
|
|
*/
|
|
|
|
/*
|
|
* Backend page supplier routines
|
|
*
|
|
* Arguments:
|
|
* zone The zone that is requesting pages
|
|
* size The number of bytes being requested
|
|
* pflag Flags for these memory pages, see below.
|
|
* wait Indicates our willingness to block.
|
|
*
|
|
* Returns:
|
|
* A pointer to the alloced memory or NULL on failure.
|
|
*/
|
|
|
|
typedef void *(*uma_alloc)(uma_zone_t zone, int size, u_int8_t *pflag, int wait);
|
|
|
|
/*
|
|
* Backend page free routines
|
|
*
|
|
* Arguments:
|
|
* item A pointer to the previously allocated pages
|
|
* size The original size of the allocation
|
|
* pflag The flags for the slab. See UMA_SLAB_* below
|
|
*
|
|
* Returns:
|
|
* None
|
|
*/
|
|
typedef void (*uma_free)(void *item, int size, u_int8_t pflag);
|
|
|
|
|
|
|
|
/*
|
|
* Sets up the uma allocator. (Called by vm_mem_init)
|
|
*
|
|
* Arguments:
|
|
* bootmem A pointer to memory used to bootstrap the system.
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*
|
|
* Discussion:
|
|
* This memory is used for zones which allocate things before the
|
|
* backend page supplier can give us pages. It should be
|
|
* UMA_SLAB_SIZE * boot_pages bytes. (see uma_int.h)
|
|
*
|
|
*/
|
|
|
|
void uma_startup(void *bootmem, int boot_pages);
|
|
|
|
/*
|
|
* Finishes starting up the allocator. This should
|
|
* be called when kva is ready for normal allocs.
|
|
*
|
|
* Arguments:
|
|
* None
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*
|
|
* Discussion:
|
|
* uma_startup2 is called by kmeminit() to enable us of uma for malloc.
|
|
*/
|
|
|
|
void uma_startup2(void);
|
|
|
|
/*
|
|
* Reclaims unused memory for all zones
|
|
*
|
|
* Arguments:
|
|
* None
|
|
* Returns:
|
|
* None
|
|
*
|
|
* This should only be called by the page out daemon.
|
|
*/
|
|
|
|
void uma_reclaim(void);
|
|
|
|
/*
|
|
* Switches the backing object of a zone
|
|
*
|
|
* Arguments:
|
|
* zone The zone to update
|
|
* obj The obj to use for future allocations
|
|
* size The size of the object to allocate
|
|
*
|
|
* Returns:
|
|
* 0 if kva space can not be allocated
|
|
* 1 if successful
|
|
*
|
|
* Discussion:
|
|
* A NULL object can be used and uma will allocate one for you. Setting
|
|
* the size will limit the amount of memory allocated to this zone.
|
|
*
|
|
*/
|
|
struct vm_object;
|
|
int uma_zone_set_obj(uma_zone_t zone, struct vm_object *obj, int size);
|
|
|
|
/*
|
|
* Sets a high limit on the number of items allowed in a zone
|
|
*
|
|
* Arguments:
|
|
* zone The zone to limit
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*/
|
|
void uma_zone_set_max(uma_zone_t zone, int nitems);
|
|
|
|
/*
|
|
* The following two routines (uma_zone_set_init/fini)
|
|
* are used to set the backend init/fini pair which acts on an
|
|
* object as it becomes allocated and is placed in a slab within
|
|
* the specified zone's backing keg. These should probably not
|
|
* be changed once allocations have already begun and only
|
|
* immediately upon zone creation.
|
|
*/
|
|
void uma_zone_set_init(uma_zone_t zone, uma_init uminit);
|
|
void uma_zone_set_fini(uma_zone_t zone, uma_fini fini);
|
|
|
|
/*
|
|
* The following two routines (uma_zone_set_zinit/zfini) are
|
|
* used to set the zinit/zfini pair which acts on an object as
|
|
* it passes from the backing Keg's slab cache to the
|
|
* specified Zone's bucket cache. These should probably not
|
|
* be changed once allocations have already begun and
|
|
* only immediately upon zone creation.
|
|
*/
|
|
void uma_zone_set_zinit(uma_zone_t zone, uma_init zinit);
|
|
void uma_zone_set_zfini(uma_zone_t zone, uma_fini zfini);
|
|
|
|
/*
|
|
* Replaces the standard page_alloc or obj_alloc functions for this zone
|
|
*
|
|
* Arguments:
|
|
* zone The zone whos back end allocator is being changed.
|
|
* allocf A pointer to the allocation function
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*
|
|
* Discussion:
|
|
* This could be used to implement pageable allocation, or perhaps
|
|
* even DMA allocators if used in conjunction with the OFFPAGE
|
|
* zone flag.
|
|
*/
|
|
|
|
void uma_zone_set_allocf(uma_zone_t zone, uma_alloc allocf);
|
|
|
|
/*
|
|
* Used for freeing memory provided by the allocf above
|
|
*
|
|
* Arguments:
|
|
* zone The zone that intends to use this free routine.
|
|
* freef The page freeing routine.
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*/
|
|
|
|
void uma_zone_set_freef(uma_zone_t zone, uma_free freef);
|
|
|
|
/*
|
|
* These flags are setable in the allocf and visable in the freef.
|
|
*/
|
|
#define UMA_SLAB_BOOT 0x01 /* Slab alloced from boot pages */
|
|
#define UMA_SLAB_KMEM 0x02 /* Slab alloced from kmem_map */
|
|
#define UMA_SLAB_PRIV 0x08 /* Slab alloced from priv allocator */
|
|
#define UMA_SLAB_OFFP 0x10 /* Slab is managed separately */
|
|
#define UMA_SLAB_MALLOC 0x20 /* Slab is a large malloc slab */
|
|
/* 0x40 and 0x80 are available */
|
|
|
|
/*
|
|
* Used to pre-fill a zone with some number of items
|
|
*
|
|
* Arguments:
|
|
* zone The zone to fill
|
|
* itemcnt The number of items to reserve
|
|
*
|
|
* Returns:
|
|
* Nothing
|
|
*
|
|
* NOTE: This is blocking and should only be done at startup
|
|
*/
|
|
void uma_prealloc(uma_zone_t zone, int itemcnt);
|
|
|
|
/*
|
|
* Used to lookup the reference counter allocated for an item
|
|
* from a UMA_ZONE_REFCNT zone. For UMA_ZONE_REFCNT zones,
|
|
* reference counters are allocated for items and stored in
|
|
* the underlying slab header.
|
|
*
|
|
* Arguments:
|
|
* zone The UMA_ZONE_REFCNT zone to which the item belongs.
|
|
* item The address of the item for which we want a refcnt.
|
|
*
|
|
* Returns:
|
|
* A pointer to a u_int32_t reference counter.
|
|
*/
|
|
u_int32_t *uma_find_refcnt(uma_zone_t zone, void *item);
|
|
|
|
/*
|
|
* Exported statistics structures to be used by user space monitoring tools.
|
|
* Statistics stream consusts of a uma_stream_header, followed by a series of
|
|
* alternative uma_type_header and uma_type_stat structures. Statistics
|
|
* structures
|
|
*/
|
|
#define UMA_STREAM_VERSION 0x00000001
|
|
struct uma_stream_header {
|
|
u_int32_t ush_version; /* Stream format version. */
|
|
u_int32_t ush_maxcpus; /* Value of MAXCPU for stream. */
|
|
u_int32_t ush_count; /* Number of records. */
|
|
u_int32_t _ush_pad; /* Pad/reserved field. */
|
|
};
|
|
|
|
#define UTH_MAX_NAME 32
|
|
#define UTH_ZONE_SECONDARY 0x00000001
|
|
struct uma_type_header {
|
|
/*
|
|
* Static per-zone data, some extracted from the supporting keg.
|
|
*/
|
|
char uth_name[UTH_MAX_NAME];
|
|
u_int32_t uth_align; /* Keg: alignment. */
|
|
u_int32_t uth_size; /* Keg: requested size of item. */
|
|
u_int32_t uth_rsize; /* Keg: real size of item. */
|
|
u_int32_t uth_maxpages; /* Keg: maximum number of pages. */
|
|
u_int32_t uth_limit; /* Keg: max items to allocate. */
|
|
|
|
/*
|
|
* Current dynamic zone/keg-derived statistics.
|
|
*/
|
|
u_int32_t uth_pages; /* Keg: pages allocated. */
|
|
u_int32_t uth_keg_free; /* Keg: items free. */
|
|
u_int32_t uth_zone_free; /* Zone: items free. */
|
|
u_int32_t uth_bucketsize; /* Zone: desired bucket size. */
|
|
u_int32_t uth_zone_flags; /* Zone: flags. */
|
|
u_int64_t uth_allocs; /* Zone: number of allocations. */
|
|
u_int64_t uth_frees; /* Zone: number of frees. */
|
|
u_int64_t uth_fails; /* Zone: number of alloc failures. */
|
|
u_int64_t _uth_reserved1[3]; /* Reserved. */
|
|
};
|
|
|
|
struct uma_percpu_stat {
|
|
u_int64_t ups_allocs; /* Cache: number of alloctions. */
|
|
u_int64_t ups_frees; /* Cache: number of frees. */
|
|
u_int64_t ups_cache_free; /* Cache: free items in cache. */
|
|
u_int64_t _ups_reserved[5]; /* Reserved. */
|
|
};
|
|
|
|
#endif
|