kolibrios/kernel/branches/kolibri_pe/include/slab.h
Sergey Semyonov (Serge) bc6cebbf4b mem_free
git-svn-id: svn://kolibrios.org@886 a494cfbc-eb01-0410-851d-a64ba20cac60
2008-10-27 20:47:58 +00:00

83 lines
2.4 KiB
C

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 {
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 */
u32_t order; /**< Order of frames to be allocated */
unsigned 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;
typedef struct {
link_t link; /**< List of full/partial slabs. */
slab_cache_t *cache; /**< Pointer to parent cache. */
count_t available; /**< Count of available items in this slab. */
void *start; /**< Start address of first item. */
void *nextavail; /**< The index of next available item. */
} slab_t;
#define SLAB_INSIDE_SIZE (4096 >> 3)
/** Maximum wasted space we allow for cache */
#define SLAB_MAX_BADNESS(cache) (((size_t) PAGE_SIZE << (cache)->order) >> 2)
/** 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)
slab_cache_t * slab_cache_create(
size_t size,
size_t align,
int (*constructor)(void *obj, int kmflag),
int (*destructor)(void *obj),
int flags);
void* __fastcall slab_alloc(slab_cache_t *cache, int flags);
void __fastcall slab_free(slab_cache_t *cache, void *obj);