421 lines
12 KiB
C
421 lines
12 KiB
C
/*
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* Copyright (c) 2002, Jeffrey Roberson <jroberson@chesapeake.net>
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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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* Jeff Roberson <jroberson@chesapeake.net>
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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 neccisary.
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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 neccisary 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, int 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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/* Definitions for uma_zcreate flags */
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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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/* 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 a uma zone
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*
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* Arguments:
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* zone The zone we want to destroy.
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* wait This flag indicates whether or not we should wait for all
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* allocations to free, or return an errno on outstanding memory.
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*
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* Returns:
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* 0 on successful completion, or EWOULDBLOCK if there are outstanding
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* allocations and the wait flag is M_NOWAIT
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*/
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int uma_zdestroy(uma_zone_t zone, int wait);
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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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* wait This flag indicates whether or not we are allowed to block while
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* allocating memory for this zone should we run out.
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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 wait);
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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 wait);
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static __inline void *
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uma_zalloc(uma_zone_t zone, int wait)
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{
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return uma_zalloc_arg(zone, NULL, wait);
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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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return 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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* hash An area of memory that will become the malloc hash
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* elems The number of elements in this array
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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 prepare the malloc
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* hash bucket, and enable use of uma for malloc ops.
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*/
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void uma_startup2(void *hash, u_long elems);
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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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* 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_KMAP 0x04 /* Slab alloced from kernel_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 seperately */
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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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