44be675ffa
by accepting the user supplied flags directly. Previously this was not done so that flags for the same field would not be defined in two different files. Add comments in each header instructing future developers on how now to shoot their feet. - Fix a test for !OFFPAGE which should have been a test for HASH. This would have caused a panic if we had ever destructed a malloc zone. This also opens up the possibility that other zones could use the vsetobj() method rather than a hash.
435 lines
12 KiB
C
435 lines
12 KiB
C
/*
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* Copyright (c) 2002, Jeffrey Roberson <jeff@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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/*
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* uma.h - External definitions for the Universal Memory Allocator
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*
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*/
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#ifndef VM_UMA_H
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#define VM_UMA_H
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#include <sys/param.h> /* For NULL */
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#include <sys/malloc.h> /* For M_* */
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/* User visable parameters */
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#define UMA_SMALLEST_UNIT (PAGE_SIZE / 256) /* Smallest item allocated */
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/* Types and type defs */
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struct uma_zone;
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/* Opaque type used as a handle to the zone */
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typedef struct uma_zone * uma_zone_t;
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/*
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* Item constructor
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*
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* Arguments:
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* item A pointer to the memory which has been allocated.
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* arg The arg field passed to uma_zalloc_arg
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* size The size of the allocated item
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*
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* Returns:
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* Nothing
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*
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* Discussion:
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* The constructor is called just before the memory is returned
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* to the user. It may block if necessary.
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*/
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typedef void (*uma_ctor)(void *mem, int size, void *arg);
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/*
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* Item destructor
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*
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* Arguments:
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* item A pointer to the memory which has been allocated.
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* size The size of the item being destructed.
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* arg Argument passed through uma_zfree_arg
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*
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* Returns:
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* Nothing
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*
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* Discussion:
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* The destructor may perform operations that differ from those performed
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* by the initializer, but it must leave the object in the same state.
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* This IS type stable storage. This is called after EVERY zfree call.
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*/
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typedef void (*uma_dtor)(void *mem, int size, void *arg);
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/*
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* Item initializer
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*
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* Arguments:
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* item A pointer to the memory which has been allocated.
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* size The size of the item being initialized.
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*
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* Returns:
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* Nothing
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*
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* Discussion:
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* The initializer is called when the memory is cached in the uma zone.
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* this should be the same state that the destructor leaves the object in.
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*/
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typedef void (*uma_init)(void *mem, int size);
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/*
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* Item discard function
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*
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* Arguments:
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* item A pointer to memory which has been 'freed' but has not left the
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* zone's cache.
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* size The size of the item being discarded.
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*
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* Returns:
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* Nothing
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*
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* Discussion:
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* This routine is called when memory leaves a zone and is returned to the
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* system for other uses. It is the counter part to the init function.
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*/
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typedef void (*uma_fini)(void *mem, int size);
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/*
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* What's the difference between initializing and constructing?
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*
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* The item is initialized when it is cached, and this is the state that the
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* object should be in when returned to the allocator. The purpose of this is
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* to remove some code which would otherwise be called on each allocation by
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* utilizing a known, stable state. This differs from the constructor which
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* will be called on EVERY allocation.
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*
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* For example, in the initializer you may want to initialize embeded locks,
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* NULL list pointers, set up initial states, magic numbers, etc. This way if
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* the object is held in the allocator and re-used it won't be necessary to
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* re-initialize it.
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*
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* The constructor may be used to lock a data structure, link it on to lists,
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* bump reference counts or total counts of outstanding structures, etc.
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*
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*/
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/* Function proto types */
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/*
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* Create a new uma zone
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*
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* Arguments:
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* name The text name of the zone for debugging and stats, this memory
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* should not be freed until the zone has been deallocated.
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* size The size of the object that is being created.
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* ctor The constructor that is called when the object is allocated
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* dtor The destructor that is called when the object is freed.
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* init An initializer that sets up the initial state of the memory.
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* fini A discard function that undoes initialization done by init.
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* ctor/dtor/init/fini may all be null, see notes above.
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* align A bitmask that corisponds to the requested alignment
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* eg 4 would be 0x3
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* flags A set of parameters that control the behavior of the zone
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*
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* Returns:
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* A pointer to a structure which is intended to be opaque to users of
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* the interface. The value may be null if the wait flag is not set.
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*/
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uma_zone_t uma_zcreate(char *name, size_t size, uma_ctor ctor, uma_dtor dtor,
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uma_init uminit, uma_fini fini, int align,
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u_int16_t flags);
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/*
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* Definitions for uma_zcreate flags
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*
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* These flags share space with UMA_ZFLAGs in uma_int.h. Be careful not to
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* overlap when adding new features. 0xf000 is in use by uma_int.h.
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*/
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#define UMA_ZONE_PAGEABLE 0x0001 /* Return items not fully backed by
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physical memory XXX Not yet */
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#define UMA_ZONE_ZINIT 0x0002 /* Initialize with zeros */
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#define UMA_ZONE_STATIC 0x0004 /* Staticly sized zone */
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#define UMA_ZONE_OFFPAGE 0x0008 /* Force the slab structure allocation
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off of the real memory */
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#define UMA_ZONE_MALLOC 0x0010 /* For use by malloc(9) only! */
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#define UMA_ZONE_NOFREE 0x0020 /* Do not free slabs of this type! */
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#define UMA_ZONE_MTXCLASS 0x0040 /* Create a new lock class */
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#define UMA_ZONE_VM 0x0080 /*
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* Used for internal vm datastructures
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* only.
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*/
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#define UMA_ZONE_HASH 0x0100 /*
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* Use a hash table instead of caching
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* information in the vm_page.
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*/
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/* Definitions for align */
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#define UMA_ALIGN_PTR (sizeof(void *) - 1) /* Alignment fit for ptr */
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#define UMA_ALIGN_LONG (sizeof(long) - 1) /* "" long */
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#define UMA_ALIGN_INT (sizeof(int) - 1) /* "" int */
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#define UMA_ALIGN_SHORT (sizeof(short) - 1) /* "" short */
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#define UMA_ALIGN_CHAR (sizeof(char) - 1) /* "" char */
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#define UMA_ALIGN_CACHE (16 - 1) /* Cache line size align */
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/*
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* Destroys an empty uma zone. If the zone is not empty uma complains loudly.
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*
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* Arguments:
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* zone The zone we want to destroy.
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*
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*/
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void uma_zdestroy(uma_zone_t zone);
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/*
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* Allocates an item out of a zone
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*
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* Arguments:
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* zone The zone we are allocating from
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* arg This data is passed to the ctor function
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* flags See sys/malloc.h for available flags.
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*
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* Returns:
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* A non null pointer to an initialized element from the zone is
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* garanteed if the wait flag is M_WAITOK, otherwise a null pointer may be
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* returned if the zone is empty or the ctor failed.
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*/
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void *uma_zalloc_arg(uma_zone_t zone, void *arg, int flags);
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/*
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* Allocates an item out of a zone without supplying an argument
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*
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* This is just a wrapper for uma_zalloc_arg for convenience.
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*
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*/
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static __inline void *uma_zalloc(uma_zone_t zone, int flags);
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static __inline void *
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uma_zalloc(uma_zone_t zone, int flags)
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{
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return uma_zalloc_arg(zone, NULL, flags);
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}
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/*
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* Frees an item back into the specified zone.
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*
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* Arguments:
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* zone The zone the item was originally allocated out of.
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* item The memory to be freed.
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* arg Argument passed to the destructor
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*
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* Returns:
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* Nothing.
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*/
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void uma_zfree_arg(uma_zone_t zone, void *item, void *arg);
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/*
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* Frees an item back to a zone without supplying an argument
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*
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* This is just a wrapper for uma_zfree_arg for convenience.
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*
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*/
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static __inline void uma_zfree(uma_zone_t zone, void *item);
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static __inline void
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uma_zfree(uma_zone_t zone, void *item)
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{
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uma_zfree_arg(zone, item, NULL);
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}
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/*
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* XXX The rest of the prototypes in this header are h0h0 magic for the VM.
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* If you think you need to use it for a normal zone you're probably incorrect.
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*/
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/*
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* Backend page supplier routines
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*
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* Arguments:
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* zone The zone that is requesting pages
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* size The number of bytes being requested
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* pflag Flags for these memory pages, see below.
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* wait Indicates our willingness to block.
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*
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* Returns:
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* A pointer to the alloced memory or NULL on failure.
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*/
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typedef void *(*uma_alloc)(uma_zone_t zone, int size, u_int8_t *pflag, int wait);
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/*
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* Backend page free routines
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*
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* Arguments:
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* item A pointer to the previously allocated pages
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* size The original size of the allocation
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* pflag The flags for the slab. See UMA_SLAB_* below
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*
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* Returns:
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* None
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*/
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typedef void (*uma_free)(void *item, int size, u_int8_t pflag);
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/*
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* Sets up the uma allocator. (Called by vm_mem_init)
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*
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* Arguments:
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* bootmem A pointer to memory used to bootstrap the system.
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*
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* Returns:
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* Nothing
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*
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* Discussion:
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* This memory is used for zones which allocate things before the
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* backend page supplier can give us pages. It should be
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* UMA_SLAB_SIZE * UMA_BOOT_PAGES bytes. (see uma_int.h)
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*
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*/
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void uma_startup(void *bootmem);
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/*
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* Finishes starting up the allocator. This should
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* be called when kva is ready for normal allocs.
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*
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* Arguments:
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* None
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*
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* Returns:
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* Nothing
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*
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* Discussion:
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* uma_startup2 is called by kmeminit() to enable us of uma for malloc.
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*/
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void uma_startup2(void);
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/*
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* Reclaims unused memory for all zones
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*
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* Arguments:
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* None
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* Returns:
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* None
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*
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* This should only be called by the page out daemon.
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*/
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void uma_reclaim(void);
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/*
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* Switches the backing object of a zone
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*
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* Arguments:
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* zone The zone to update
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* obj The obj to use for future allocations
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* size The size of the object to allocate
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*
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* Returns:
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* 0 if kva space can not be allocated
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* 1 if successful
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*
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* Discussion:
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* A NULL object can be used and uma will allocate one for you. Setting
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* the size will limit the amount of memory allocated to this zone.
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*
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*/
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struct vm_object;
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int uma_zone_set_obj(uma_zone_t zone, struct vm_object *obj, int size);
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/*
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* Sets a high limit on the number of items allowed in a zone
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*
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* Arguments:
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* zone The zone to limit
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*
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* Returns:
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* Nothing
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*/
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void uma_zone_set_max(uma_zone_t zone, int nitems);
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/*
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* Replaces the standard page_alloc or obj_alloc functions for this zone
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*
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* Arguments:
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* zone The zone whos back end allocator is being changed.
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* allocf A pointer to the allocation function
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*
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* Returns:
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* Nothing
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*
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* Discussion:
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* This could be used to implement pageable allocation, or perhaps
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* even DMA allocators if used in conjunction with the OFFPAGE
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* zone flag.
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*/
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void uma_zone_set_allocf(uma_zone_t zone, uma_alloc allocf);
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/*
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* Used for freeing memory provided by the allocf above
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*
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* Arguments:
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* zone The zone that intends to use this free routine.
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* freef The page freeing routine.
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*
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* Returns:
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* Nothing
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*/
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void uma_zone_set_freef(uma_zone_t zone, uma_free freef);
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/*
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* These flags are setable in the allocf and visable in the freef.
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*/
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#define UMA_SLAB_BOOT 0x01 /* Slab alloced from boot pages */
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#define UMA_SLAB_KMEM 0x02 /* Slab alloced from kmem_map */
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#define UMA_SLAB_PRIV 0x08 /* Slab alloced from priv allocator */
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#define UMA_SLAB_OFFP 0x10 /* Slab is managed separately */
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#define UMA_SLAB_MALLOC 0x20 /* Slab is a large malloc slab */
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/* 0x40 and 0x80 are available */
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/*
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* Used to pre-fill a zone with some number of items
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*
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* Arguments:
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* zone The zone to fill
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* itemcnt The number of items to reserve
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*
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* Returns:
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* Nothing
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*
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* NOTE: This is blocking and should only be done at startup
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*/
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void uma_prealloc(uma_zone_t zone, int itemcnt);
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#endif
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