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759 palkovsky 1 
/*
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 * Copyright (c) 2006 Ondrej Palkovsky
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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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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - 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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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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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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/** @addtogroup genericmm
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 * @{
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 */
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/** @file
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 */
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#ifndef KERN_SLAB_H_
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#define KERN_SLAB_H_
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#include <adt/list.h>
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#include <synch/spinlock.h>
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#include <atomic.h>
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#include <mm/frame.h>
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/** Minimum size to be allocated by malloc */
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#define SLAB_MIN_MALLOC_W  4
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/** Maximum size to be allocated by malloc */
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#define SLAB_MAX_MALLOC_W  22
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/** Initial Magazine size (TODO: dynamically growing magazines) */
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#define SLAB_MAG_SIZE  4
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/** If object size is less, store control structure inside SLAB */
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#define SLAB_INSIDE_SIZE  (PAGE_SIZE >> 3)
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/** Maximum wasted space we allow for cache */
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#define SLAB_MAX_BADNESS(cache) \
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    (((unsigned int) PAGE_SIZE << (cache)->order) >> 2)
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/* slab_reclaim constants */
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/** Reclaim all possible memory, because we are in memory stress */
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#define SLAB_RECLAIM_ALL  0x01
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/* cache_create flags */
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/** Do not use per-cpu cache */
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#define SLAB_CACHE_NOMAGAZINE   0x01
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/** Have control structure inside SLAB */
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#define SLAB_CACHE_SLINSIDE     0x02
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/** We add magazine cache later, if we have this flag */
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#define SLAB_CACHE_MAGDEFERRED  (0x04 | SLAB_CACHE_NOMAGAZINE)
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typedef struct {
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    link_t link;
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    size_t busy;  /**< Count of full slots in magazine */
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    size_t size;  /**< Number of slots in magazine */
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    void *objs[];  /**< Slots in magazine */
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} slab_magazine_t;
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typedef struct {
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    slab_magazine_t *current;
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    slab_magazine_t *last;
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    SPINLOCK_DECLARE(lock);
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} slab_mag_cache_t;
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typedef struct {
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    char *name;
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    link_t link;
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    /* Configuration */
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    /** Size of slab position - align_up(sizeof(obj)) */
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    size_t size;
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    int (*constructor)(void *obj, int kmflag);
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    int (*destructor)(void *obj);
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    /** Flags changing behaviour of cache */
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    int flags;
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    /* Computed values */
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    uint8_t order;         /**< Order of frames to be allocated */
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    unsigned int objects;  /**< Number of objects that fit in */
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    /* Statistics */
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    atomic_t allocated_slabs;
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    atomic_t allocated_objs;
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    atomic_t cached_objs;
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    /** How many magazines in magazines list */
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    atomic_t magazine_counter;
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    /* Slabs */
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    link_t full_slabs;     /**< List of full slabs */
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    link_t partial_slabs;  /**< List of partial slabs */
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    SPINLOCK_DECLARE(slablock);
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    /* Magazines */
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    link_t magazines;  /**< List o full magazines */
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    SPINLOCK_DECLARE(maglock);
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    /** CPU cache */
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    slab_mag_cache_t *mag_cache;
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} slab_cache_t;
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extern slab_cache_t *slab_cache_create(char *, size_t, size_t,
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    int (*)(void *, int), int (*)(void *), int);
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extern void slab_cache_destroy(slab_cache_t *);
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extern void * slab_alloc(slab_cache_t *, int);
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extern void slab_free(slab_cache_t *, void *);
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extern size_t slab_reclaim(int);
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/* slab subsytem initialization */
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extern void slab_cache_init(void);
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extern void slab_enable_cpucache(void);
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/* kconsole debug */
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extern void slab_print_list(void);
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/* malloc support */
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extern void *malloc(unsigned int, int);
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extern void *realloc(void *, unsigned int, int);
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extern void free(void *);
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#endif
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/** @}
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 */