83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
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typedef struct {
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link_t link;
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count_t busy; /**< Count of full slots in magazine */
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count_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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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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u32_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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typedef struct {
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link_t link; /**< List of full/partial slabs. */
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slab_cache_t *cache; /**< Pointer to parent cache. */
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count_t available; /**< Count of available items in this slab. */
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void *start; /**< Start address of first item. */
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void *nextavail; /**< The index of next available item. */
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} slab_t;
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#define SLAB_INSIDE_SIZE (4096 >> 3)
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/** Maximum wasted space we allow for cache */
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#define SLAB_MAX_BADNESS(cache) (((size_t) PAGE_SIZE << (cache)->order) >> 2)
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/** Do not use per-cpu cache */
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#define SLAB_CACHE_NOMAGAZINE 0x1
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/** Have control structure inside SLAB */
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#define SLAB_CACHE_SLINSIDE 0x2
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/** We add magazine cache later, if we have this flag */
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#define SLAB_CACHE_MAGDEFERRED (0x4 | SLAB_CACHE_NOMAGAZINE)
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slab_cache_t * slab_cache_create(
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size_t size,
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size_t align,
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int (*constructor)(void *obj, int kmflag),
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int (*destructor)(void *obj),
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int flags);
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void* __fastcall slab_alloc(slab_cache_t *cache, int flags);
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void __fastcall slab_free(slab_cache_t *cache, void *obj);
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