0,0 → 1,147 |
/* |
* Copyright (c) 2006 Ondrej Palkovsky |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
/** @addtogroup genericmm |
* @{ |
*/ |
/** @file |
*/ |
|
#ifndef KERN_SLAB_H_ |
#define KERN_SLAB_H_ |
|
#include <adt/list.h> |
#include <synch/spinlock.h> |
#include <atomic.h> |
#include <mm/frame.h> |
|
/** Minimum size to be allocated by malloc */ |
#define SLAB_MIN_MALLOC_W 4 |
|
/** Maximum size to be allocated by malloc */ |
#define SLAB_MAX_MALLOC_W 18 |
|
/** Initial Magazine size (TODO: dynamically growing magazines) */ |
#define SLAB_MAG_SIZE 4 |
|
/** If object size is less, store control structure inside SLAB */ |
#define SLAB_INSIDE_SIZE (PAGE_SIZE >> 3) |
|
/** Maximum wasted space we allow for cache */ |
#define SLAB_MAX_BADNESS(cache) ((PAGE_SIZE << (cache)->order) >> 2) |
|
/* slab_reclaim constants */ |
|
/** Reclaim all possible memory, because we are in memory stress */ |
#define SLAB_RECLAIM_ALL 0x1 |
|
/* cache_create flags */ |
|
/** Do not use per-cpu cache */ |
#define SLAB_CACHE_NOMAGAZINE 0x1 |
/** Have control structure inside SLAB */ |
#define SLAB_CACHE_SLINSIDE 0x2 |
/** We add magazine cache later, if we have this flag */ |
#define SLAB_CACHE_MAGDEFERRED (0x4 | SLAB_CACHE_NOMAGAZINE) |
|
typedef struct { |
link_t link; |
count_t busy; /**< Count of full slots in magazine */ |
count_t size; /**< Number of slots in magazine */ |
void *objs[]; /**< Slots in magazine */ |
} slab_magazine_t; |
|
typedef struct { |
slab_magazine_t *current; |
slab_magazine_t *last; |
SPINLOCK_DECLARE(lock); |
} slab_mag_cache_t; |
|
|
typedef struct { |
char *name; |
|
link_t link; |
|
/* Configuration */ |
/** Size of slab position - align_up(sizeof(obj)) */ |
size_t size; |
|
int (*constructor)(void *obj, int kmflag); |
int (*destructor)(void *obj); |
|
/** Flags changing behaviour of cache */ |
int flags; |
|
/* Computed values */ |
uint8_t order; /**< Order of frames to be allocated */ |
int objects; /**< Number of objects that fit in */ |
|
/* Statistics */ |
atomic_t allocated_slabs; |
atomic_t allocated_objs; |
atomic_t cached_objs; |
/** How many magazines in magazines list */ |
atomic_t magazine_counter; |
|
/* Slabs */ |
link_t full_slabs; /**< List of full slabs */ |
link_t partial_slabs; /**< List of partial slabs */ |
SPINLOCK_DECLARE(slablock); |
/* Magazines */ |
link_t magazines; /**< List o full magazines */ |
SPINLOCK_DECLARE(maglock); |
|
/** CPU cache */ |
slab_mag_cache_t *mag_cache; |
} slab_cache_t; |
|
extern slab_cache_t * slab_cache_create(char *name, size_t size, size_t align, |
int (*constructor)(void *obj, int kmflag), int (*destructor)(void *obj), |
int flags); |
extern void slab_cache_destroy(slab_cache_t *cache); |
|
extern void * slab_alloc(slab_cache_t *cache, int flags); |
extern void slab_free(slab_cache_t *cache, void *obj); |
extern count_t slab_reclaim(int flags); |
|
/* slab subsytem initialization */ |
extern void slab_cache_init(void); |
extern void slab_enable_cpucache(void); |
|
/* kconsole debug */ |
extern void slab_print_list(void); |
|
/* malloc support */ |
extern void * malloc(unsigned int size, int flags); |
extern void * realloc(void *ptr, unsigned int size, int flags); |
extern void free(void *ptr); |
#endif |
|
/** @} |
*/ |