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e20a199fd5
backend kegs so it may source compatible memory from multiple backends. This is useful for cases such as NUMA or different layouts for the same memory type. - Provide a new api for adding new backend kegs to secondary zones. - Provide a new flag for adjusting the layout of zones to stagger allocations better across cache lines. Sponsored by: Nokia
614 lines
19 KiB
C
614 lines
19 KiB
C
/*-
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* Copyright (c) 2002, 2003, 2004, 2005 Jeffrey Roberson <jeff@FreeBSD.org>
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* Copyright (c) 2004, 2005 Bosko Milekic <bmilekic@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 visible 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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void zone_drain(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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* flags See zalloc flags
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*
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* Returns:
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* 0 on success
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* errno on failure
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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 int (*uma_ctor)(void *mem, int size, void *arg, int flags);
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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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* flags See zalloc flags
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*
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* Returns:
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* 0 on success
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* errno on failure
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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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* The initializer and the destructor should leave the object in the same
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* state.
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*/
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typedef int (*uma_init)(void *mem, int size, int flags);
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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 embedded 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 corresponds 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_int32_t flags);
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/*
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* Create a secondary 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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* 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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* zinit An initializer that sets up the initial state of the memory
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* as the object passes from the Keg's slab to the Zone's cache.
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* zfini A discard function that undoes initialization done by init
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* as the object passes from the Zone's cache to the Keg's slab.
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*
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* ctor/dtor/zinit/zfini may all be null, see notes above.
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* Note that the zinit and zfini specified here are NOT
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* exactly the same as the init/fini specified to uma_zcreate()
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* when creating a master zone. These zinit/zfini are called
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* on the TRANSITION from keg to zone (and vice-versa). Once
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* these are set, the primary zone may alter its init/fini
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* (which are called when the object passes from VM to keg)
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* using uma_zone_set_init/fini()) as well as its own
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* zinit/zfini (unset by default for master zone) with
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* uma_zone_set_zinit/zfini() (note subtle 'z' prefix).
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*
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* master A reference to this zone's Master Zone (Primary Zone),
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* which contains the backing Keg for the Secondary Zone
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* being added.
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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_zsecond_create(char *name, uma_ctor ctor, uma_dtor dtor,
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uma_init zinit, uma_fini zfini, uma_zone_t master);
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/*
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* Add a second master to a secondary zone. This provides multiple data
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* backends for objects with the same size. Both masters must have
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* compatible allocation flags. Presently, UMA_ZONE_MALLOC type zones are
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* the only supported.
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*
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* Returns:
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* Error on failure, 0 on success.
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*/
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int uma_zsecond_add(uma_zone_t zone, uma_zone_t master);
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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. 0xf0000000 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 /* Statically 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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#define UMA_ZONE_SECONDARY 0x0200 /* Zone is a Secondary Zone */
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#define UMA_ZONE_REFCNT 0x0400 /* Allocate refcnts in slabs */
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#define UMA_ZONE_MAXBUCKET 0x0800 /* Use largest buckets */
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#define UMA_ZONE_CACHESPREAD 0x1000 /*
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* Spread memory start locations across
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* all possible cache lines. May
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* require many virtually contiguous
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* backend pages and can fail early.
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*/
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#define UMA_ZONE_VTOSLAB 0x2000 /* Zone uses vtoslab for lookup. */
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/*
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* These flags are shared between the keg and zone. In zones wishing to add
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* new kegs these flags must be compatible. Some are determined based on
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* physical parameters of the request and may not be provided by the consumer.
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*/
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#define UMA_ZONE_INHERIT \
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(UMA_ZONE_OFFPAGE | UMA_ZONE_MALLOC | UMA_ZONE_HASH | \
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UMA_ZONE_REFCNT | UMA_ZONE_VTOSLAB)
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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 (0 - 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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* guaranteed if the wait flag is M_WAITOK. Otherwise a null pointer
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* may be 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 allocated 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 * boot_pages bytes. (see uma_int.h)
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*
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*/
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void uma_startup(void *bootmem, int boot_pages);
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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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* Sets the alignment mask to be used for all zones requesting cache
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* alignment. Should be called by MD boot code prior to starting VM/UMA.
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*
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* Arguments:
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* align The alignment mask
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*
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* Returns:
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* Nothing
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*/
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void uma_set_align(int align);
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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 VM object 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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* The following two routines (uma_zone_set_init/fini)
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* are used to set the backend init/fini pair which acts on an
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* object as it becomes allocated and is placed in a slab within
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* the specified zone's backing keg. These should probably not
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* be changed once allocations have already begun, but only be set
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* immediately upon zone creation.
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*/
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void uma_zone_set_init(uma_zone_t zone, uma_init uminit);
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void uma_zone_set_fini(uma_zone_t zone, uma_fini fini);
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/*
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* The following two routines (uma_zone_set_zinit/zfini) are
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* used to set the zinit/zfini pair which acts on an object as
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* it passes from the backing Keg's slab cache to the
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* specified Zone's bucket cache. These should probably not
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* be changed once allocations have already begun, but only be set
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* immediately upon zone creation.
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*/
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void uma_zone_set_zinit(uma_zone_t zone, uma_init zinit);
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void uma_zone_set_zfini(uma_zone_t zone, uma_fini zfini);
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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 whose backend 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 visible 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_KERNEL 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 separately */
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|
#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);
|
|
|
|
/*
|
|
* 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);
|
|
int uma_zone_exhausted_nolock(uma_zone_t zone);
|
|
|
|
/*
|
|
* 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 {
|
|
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 allocations. */
|
|
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
|