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freebsd-nq/sys/vm/uma.h
Mark Johnston 389a3fa693 uma: Add UMA_ZONE_UNMANAGED 
Allow a zone to opt out of cache size management.  In particular,
uma_reclaim() and uma_reclaim_domain() will not reclaim any memory from
the zone, nor will uma_timeout() purge cached items if the zone is idle.
This effectively means that the zone consumer has control over when
items are reclaimed from the cache.  In particular, uma_zone_reclaim()
will still reclaim cached items from an unmanaged zone.

Reviewed by:	hselasky, kib
MFC after:	3 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D34142
2022-02-15 09:25:34 -05:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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_* */
#include <sys/_smr.h>
/* User visible parameters */
#define UMA_SMALLEST_UNIT 8 /* 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.
* The initializer and the destructor should leave the object in the same
* state.
*/
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);
/*
* Import new memory into a cache zone.
*/
typedef int (*uma_import)(void *arg, void **store, int count, int domain,
int flags);
/*
* Free memory from a cache zone.
*/
typedef void (*uma_release)(void *arg, void **store, int count);
/*
* 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 embedded 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 corresponds 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(const char *name, size_t size, uma_ctor ctor,
uma_dtor dtor, uma_init uminit, uma_fini fini,
int align, uint32_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 primary 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 primary zone) with
* uma_zone_set_zinit/zfini() (note subtle 'z' prefix).
*
* primary A reference to this zone's 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(const char *name, uma_ctor ctor, uma_dtor dtor,
uma_init zinit, uma_fini zfini, uma_zone_t primary);
/*
* Create cache-only zones.
*
* This allows uma's per-cpu cache facilities to handle arbitrary
* pointers. Consumers must specify the import and release functions to
* fill and destroy caches. UMA does not allocate any memory for these
* zones. The 'arg' parameter is passed to import/release and is caller
* specific.
*/
uma_zone_t uma_zcache_create(const char *name, int size, uma_ctor ctor,
uma_dtor dtor, uma_init zinit, uma_fini zfini, uma_import zimport,
uma_release zrelease, void *arg, int flags);
/*
* 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.
*/
#define UMA_ZONE_UNMANAGED 0x0001 /*
* Don't regulate the cache size, even
* under memory pressure.
*/
#define UMA_ZONE_ZINIT 0x0002 /* Initialize with zeros */
#define UMA_ZONE_CONTIG 0x0004 /*
* Physical memory underlying an object
* must be contiguous.
*/
#define UMA_ZONE_NOTOUCH 0x0008 /* UMA may not access the 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_NOTPAGE 0x0100 /* allocf memory not vm pages */
#define UMA_ZONE_SECONDARY 0x0200 /* Zone is a Secondary Zone */
#define UMA_ZONE_NOBUCKET 0x0400 /* Do not use buckets. */
#define UMA_ZONE_MAXBUCKET 0x0800 /* Use largest buckets. */
#define UMA_ZONE_CACHESPREAD 0x2000 /*
* Spread memory start locations across
* all possible cache lines. May
* require many virtually contiguous
* backend pages and can fail early.
*/
#define UMA_ZONE_NODUMP 0x4000 /*
* Zone's pages will not be included in
* mini-dumps.
*/
#define UMA_ZONE_PCPU 0x8000 /*
* Allocates mp_maxid + 1 slabs of
* PAGE_SIZE
*/
#define UMA_ZONE_FIRSTTOUCH 0x10000 /* First touch NUMA policy */
#define UMA_ZONE_ROUNDROBIN 0x20000 /* Round-robin NUMA policy. */
#define UMA_ZONE_SMR 0x40000 /*
* Safe memory reclamation defers
* frees until all read sections
* have exited. This flag creates
* a unique SMR context for this
* zone. To share contexts see
* uma_zone_set_smr() below.
*
* See sys/smr.h for more details.
*/
#define UMA_ZONE_NOKASAN 0x80000 /*
* Disable KASAN verification. This is
* implied by NOFREE. Cache zones are
* not verified by default.
*/
/* In use by UMA_ZFLAGs: 0xffe00000 */
/*
* These flags are shared between the keg and zone. Some are determined
* based on physical parameters of the request and may not be provided by
* the consumer.
*/
#define UMA_ZONE_INHERIT \
(UMA_ZONE_NOTOUCH | UMA_ZONE_MALLOC | UMA_ZONE_NOFREE | \
UMA_ZONE_VM | UMA_ZONE_NOTPAGE | UMA_ZONE_PCPU | \
UMA_ZONE_FIRSTTOUCH | UMA_ZONE_ROUNDROBIN | UMA_ZONE_NOKASAN)
/* 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 (0 - 1) /* Cache line size align */
#define UMA_ALIGNOF(type) (_Alignof(type) - 1) /* Alignment fit for 'type' */
#define UMA_ANYDOMAIN -1 /* Special value for domain search. */
/*
* 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
* guaranteed 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);
/* Allocate per-cpu data. Access the correct data with zpcpu_get(). */
void *uma_zalloc_pcpu_arg(uma_zone_t zone, void *arg, int flags);
/* Use with SMR zones. */
void *uma_zalloc_smr(uma_zone_t zone, int flags);
/*
* Allocate an item from a specific NUMA domain. This uses a slow path in
* the allocator but is guaranteed to allocate memory from the requested
* domain if M_WAITOK is set.
*
* Arguments:
* zone The zone we are allocating from
* arg This data is passed to the ctor function
* domain The domain to allocate from.
* flags See sys/malloc.h for available flags.
*/
void *uma_zalloc_domain(uma_zone_t zone, void *arg, int domain, 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_pcpu(uma_zone_t zone, int flags);
static __inline void *
uma_zalloc(uma_zone_t zone, int flags)
{
return uma_zalloc_arg(zone, NULL, flags);
}
static __inline void *
uma_zalloc_pcpu(uma_zone_t zone, int flags)
{
return uma_zalloc_pcpu_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);
/* Use with PCPU zones. */
void uma_zfree_pcpu_arg(uma_zone_t zone, void *item, void *arg);
/* Use with SMR zones. */
void uma_zfree_smr(uma_zone_t zone, void *item);
/*
* 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_pcpu(uma_zone_t zone, void *item);
static __inline void
uma_zfree(uma_zone_t zone, void *item)
{
uma_zfree_arg(zone, item, NULL);
}
static __inline void
uma_zfree_pcpu(uma_zone_t zone, void *item)
{
uma_zfree_pcpu_arg(zone, item, NULL);
}
/*
* Wait until the specified zone can allocate an item.
*/
void uma_zwait(uma_zone_t zone);
/*
* 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.
* domain The NUMA domain that we prefer for this allocation.
* wait Indicates our willingness to block.
*
* Returns:
* A pointer to the allocated memory or NULL on failure.
*/
typedef void *(*uma_alloc)(uma_zone_t zone, vm_size_t size, int domain,
uint8_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, vm_size_t size, uint8_t pflag);
/*
* Reclaims unused memory. If no NUMA domain is specified, memory from all
* domains is reclaimed.
*
* Arguments:
* req Reclamation request type.
* domain The target NUMA domain.
* Returns:
* None
*/
#define UMA_RECLAIM_DRAIN 1 /* release bucket cache */
#define UMA_RECLAIM_DRAIN_CPU 2 /* release bucket and per-CPU caches */
#define UMA_RECLAIM_TRIM 3 /* trim bucket cache to WSS */
void uma_reclaim(int req);
void uma_reclaim_domain(int req, int domain);
void uma_zone_reclaim(uma_zone_t, int req);
void uma_zone_reclaim_domain(uma_zone_t, int req, int domain);
/*
* Sets the alignment mask to be used for all zones requesting cache
* alignment. Should be called by MD boot code prior to starting VM/UMA.
*
* Arguments:
* align The alignment mask
*
* Returns:
* Nothing
*/
void uma_set_align(int align);
/*
* Set a reserved number of items to hold for M_USE_RESERVE allocations. All
* other requests must allocate new backing pages.
*/
void uma_zone_reserve(uma_zone_t zone, int nitems);
/*
* Reserves the maximum KVA space required by the zone and configures the zone
* to use a backend that allocates physical memory and maps it using the
* reserved KVA.
*
* Arguments:
* zone The zone to update.
* nitems The upper limit on the number of items that can be allocated.
*
* Returns:
* 0 if KVA space can not be allocated
* 1 if successful
*
* Discussion:
* When the machine supports a direct map and the zone's items are smaller
* than a page, the zone will use the direct map instead of allocating KVA
* space.
*/
int uma_zone_reserve_kva(uma_zone_t zone, int nitems);
/*
* Sets an upper limit on the number of items allocated from a zone
*
* Arguments:
* zone The zone to limit
* nitems The requested upper limit on the number of items allowed
*
* Returns:
* int The effective value of nitems
*/
int uma_zone_set_max(uma_zone_t zone, int nitems);
/*
* Sets an upper limit on the number of items allowed in zone's caches
*
* Arguments:
* zone The zone to limit
* nitems The requested upper limit on the number of items allowed
*/
void uma_zone_set_maxcache(uma_zone_t zone, int nitems);
/*
* Obtains the effective limit on the number of items in a zone
*
* Arguments:
* zone The zone to obtain the effective limit from
*
* Return:
* 0 No limit
* int The effective limit of the zone
*/
int uma_zone_get_max(uma_zone_t zone);
/*
* Sets a warning to be printed when limit is reached
*
* Arguments:
* zone The zone we will warn about
* warning Warning content
*
* Returns:
* Nothing
*/
void uma_zone_set_warning(uma_zone_t zone, const char *warning);
/*
* Sets a function to run when limit is reached
*
* Arguments:
* zone The zone to which this applies
* fx The function ro run
*
* Returns:
* Nothing
*/
typedef void (*uma_maxaction_t)(uma_zone_t, int);
void uma_zone_set_maxaction(uma_zone_t zone, uma_maxaction_t);
/*
* Obtains the approximate current number of items allocated from a zone
*
* Arguments:
* zone The zone to obtain the current allocation count from
*
* Return:
* int The approximate current number of items allocated from the zone
*/
int uma_zone_get_cur(uma_zone_t zone);
/*
* 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, but only be set
* 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, but only be set
* 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 backend allocator for this zone.
*
* Arguments:
* zone The zone whose backend 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);
/*
* Associate a zone with a smr context that is allocated after creation
* so that multiple zones may share the same context.
*/
void uma_zone_set_smr(uma_zone_t zone, smr_t smr);
/*
* Fetch the smr context that was set or made in uma_zcreate().
*/
smr_t uma_zone_get_smr(uma_zone_t zone);
/*
* These flags are setable in the allocf and visible in the freef.
*/
#define UMA_SLAB_BOOT 0x01 /* Slab alloced from boot pages */
#define UMA_SLAB_KERNEL 0x04 /* Slab alloced from kmem */
#define UMA_SLAB_PRIV 0x08 /* Slab alloced from priv allocator */
/* 0x02, 0x10, 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 determine if a fixed-size zone is exhausted.
*
* Arguments:
* zone The zone to check
*
* Returns:
* Non-zero if zone is exhausted.
*/
int uma_zone_exhausted(uma_zone_t zone);
/*
* Returns the bytes of memory consumed by the zone.
*/
size_t uma_zone_memory(uma_zone_t zone);
/*
* Common UMA_ZONE_PCPU zones.
*/
extern uma_zone_t pcpu_zone_4;
extern uma_zone_t pcpu_zone_8;
extern uma_zone_t pcpu_zone_16;
extern uma_zone_t pcpu_zone_32;
extern uma_zone_t pcpu_zone_64;
/*
* Exported statistics structures to be used by user space monitoring tools.
* Statistics stream consists of a uma_stream_header, followed by a series of
* alternative uma_type_header and uma_type_stat structures.
*/
#define UMA_STREAM_VERSION 0x00000001
struct uma_stream_header {
uint32_t ush_version; /* Stream format version. */
uint32_t ush_maxcpus; /* Value of MAXCPU for stream. */
uint32_t ush_count; /* Number of records. */
uint32_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];
uint32_t uth_align; /* Keg: alignment. */
uint32_t uth_size; /* Keg: requested size of item. */
uint32_t uth_rsize; /* Keg: real size of item. */
uint32_t uth_maxpages; /* Keg: maximum number of pages. */
uint32_t uth_limit; /* Keg: max items to allocate. */
/*
* Current dynamic zone/keg-derived statistics.
*/
uint32_t uth_pages; /* Keg: pages allocated. */
uint32_t uth_keg_free; /* Keg: items free. */
uint32_t uth_zone_free; /* Zone: items free. */
uint32_t uth_bucketsize; /* Zone: desired bucket size. */
uint32_t uth_zone_flags; /* Zone: flags. */
uint64_t uth_allocs; /* Zone: number of allocations. */
uint64_t uth_frees; /* Zone: number of frees. */
uint64_t uth_fails; /* Zone: number of alloc failures. */
uint64_t uth_sleeps; /* Zone: number of alloc sleeps. */
uint64_t uth_xdomain; /* Zone: Number of cross domain frees. */
uint64_t _uth_reserved1[1]; /* Reserved. */
};
struct uma_percpu_stat {
uint64_t ups_allocs; /* Cache: number of allocations. */
uint64_t ups_frees; /* Cache: number of frees. */
uint64_t ups_cache_free; /* Cache: free items in cache. */
uint64_t _ups_reserved[5]; /* Reserved. */
};
void uma_reclaim_wakeup(void);
void uma_reclaim_worker(void *);
unsigned long uma_limit(void);
/* Return the amount of memory managed by UMA. */
unsigned long uma_size(void);
/* Return the amount of memory remaining. May be negative. */
long uma_avail(void);
#endif /* _VM_UMA_H_ */
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