| 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) (((unsigned int) 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 */ |
| 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; |
| |
| 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 |
| |
| /** @} |
| */ |