diff options
Diffstat (limited to 'kern/kmem.h')
| -rw-r--r-- | kern/kmem.h | 185 |
1 files changed, 3 insertions, 182 deletions
diff --git a/kern/kmem.h b/kern/kmem.h index da618e45..0e49d492 100644 --- a/kern/kmem.h +++ b/kern/kmem.h @@ -21,135 +21,12 @@ #ifndef _KERN_KMEM_H #define _KERN_KMEM_H -#include <kern/list.h> -#include <kern/mutex.h> -#include <kern/param.h> #include <kern/stddef.h> /* - * Per-processor cache of pre-constructed objects. - * - * The flags member is a read-only CPU-local copy of the parent cache flags. - */ -struct kmem_cpu_pool { - struct mutex lock; - int flags; - int size; - int transfer_size; - int nr_objs; - void **array; -} __aligned(CPU_L1_SIZE); - -/* - * When a cache is created, its CPU pool type is determined from the buffer - * size. For small buffer sizes, many objects can be cached in a CPU pool. - * Conversely, for large buffer sizes, this would incur much overhead, so only - * a few objects are stored in a CPU pool. - */ -struct kmem_cpu_pool_type { - size_t buf_size; - int array_size; - size_t array_align; - struct kmem_cache *array_cache; -}; - -/* - * Buffer descriptor. - * - * For normal caches (i.e. without KMEM_CF_VERIFY), bufctls are located at the - * end of (but inside) each buffer. If KMEM_CF_VERIFY is set, bufctls are - * located after each buffer. - * - * When an object is allocated to a client, its bufctl isn't used. This memory - * is instead used for redzoning if cache debugging is in effect. - */ -union kmem_bufctl { - union kmem_bufctl *next; - unsigned long redzone; -}; - -/* - * Redzone guard word. - */ -#ifdef __LP64__ -#ifdef __BIG_ENDIAN__ -#define KMEM_REDZONE_WORD 0xfeedfacefeedfaceUL -#else /* __BIG_ENDIAN__ */ -#define KMEM_REDZONE_WORD 0xcefaedfecefaedfeUL -#endif /* __BIG_ENDIAN__ */ -#else /* __LP64__ */ -#ifdef __BIG_ENDIAN__ -#define KMEM_REDZONE_WORD 0xfeedfaceUL -#else /* __BIG_ENDIAN__ */ -#define KMEM_REDZONE_WORD 0xcefaedfeUL -#endif /* __BIG_ENDIAN__ */ -#endif /* __LP64__ */ - -/* - * Redzone byte for padding. - */ -#define KMEM_REDZONE_BYTE 0xbb - -/* - * Buffer tag. - * - * This structure is only used for KMEM_CF_VERIFY caches. It is located after - * the bufctl and includes information about the state of the buffer it - * describes (allocated or not). It should be thought of as a debugging - * extension of the bufctl. - */ -struct kmem_buftag { - unsigned long state; -}; - -/* - * Values the buftag state member can take. - */ -#ifdef __LP64__ -#ifdef __BIG_ENDIAN__ -#define KMEM_BUFTAG_ALLOC 0xa110c8eda110c8edUL -#define KMEM_BUFTAG_FREE 0xf4eeb10cf4eeb10cUL -#else /* __BIG_ENDIAN__ */ -#define KMEM_BUFTAG_ALLOC 0xedc810a1edc810a1UL -#define KMEM_BUFTAG_FREE 0x0cb1eef40cb1eef4UL -#endif /* __BIG_ENDIAN__ */ -#else /* __LP64__ */ -#ifdef __BIG_ENDIAN__ -#define KMEM_BUFTAG_ALLOC 0xa110c8edUL -#define KMEM_BUFTAG_FREE 0xf4eeb10cUL -#else /* __BIG_ENDIAN__ */ -#define KMEM_BUFTAG_ALLOC 0xedc810a1UL -#define KMEM_BUFTAG_FREE 0x0cb1eef4UL -#endif /* __BIG_ENDIAN__ */ -#endif /* __LP64__ */ - -/* - * Free and uninitialized patterns. - * - * These values are unconditionnally 64-bit wide since buffers are at least - * 8-byte aligned. + * Object cache. */ -#ifdef __BIG_ENDIAN__ -#define KMEM_FREE_PATTERN 0xdeadbeefdeadbeefULL -#define KMEM_UNINIT_PATTERN 0xbaddcafebaddcafeULL -#else /* __BIG_ENDIAN__ */ -#define KMEM_FREE_PATTERN 0xefbeaddeefbeaddeULL -#define KMEM_UNINIT_PATTERN 0xfecaddbafecaddbaULL -#endif /* __BIG_ENDIAN__ */ - -/* - * Page-aligned collection of unconstructed buffers. - * - * This structure is either allocated from the slab cache, or, when internal - * fragmentation allows it, or if forced by the cache creator, from the slab - * it describes. - */ -struct kmem_slab { - struct list node; - unsigned long nr_refs; - union kmem_bufctl *first_free; - void *addr; -}; +struct kmem_cache; /* * Type for constructor functions. @@ -171,63 +48,7 @@ typedef void (*kmem_cache_ctor_t)(void *); typedef unsigned long (*kmem_slab_alloc_fn_t)(size_t); typedef void (*kmem_slab_free_fn_t)(unsigned long, size_t); -/* - * Cache name buffer size. - */ -#define KMEM_NAME_SIZE 32 - -/* - * Cache flags. - * - * The flags don't change once set and can be tested without locking. - */ -#define KMEM_CF_NO_CPU_POOL 0x1 /* CPU pool layer disabled */ -#define KMEM_CF_SLAB_EXTERNAL 0x2 /* Slab data is off slab */ -#define KMEM_CF_VERIFY 0x4 /* Debugging facilities enabled */ -#define KMEM_CF_DIRECT 0x8 /* Quick buf-to-slab lookup */ - -/* - * Cache of objects. - * - * Locking order : cpu_pool -> cache. CPU pools locking is ordered by CPU ID. - * - * The partial slabs list is sorted by slab references. Slabs with a high - * number of references are placed first on the list to reduce fragmentation. - * Sorting occurs at insertion/removal of buffers in a slab. As the list - * is maintained sorted, and the number of references only changes by one, - * this is a very cheap operation in the average case and the worst (linear) - * case is very unlikely. - */ -struct kmem_cache { - /* CPU pool layer */ - struct kmem_cpu_pool cpu_pools[MAX_CPUS]; - struct kmem_cpu_pool_type *cpu_pool_type; - - /* Slab layer */ - struct mutex lock; - struct list node; /* Cache list linkage */ - struct list partial_slabs; - struct list free_slabs; - int flags; - size_t obj_size; /* User-provided size */ - size_t align; - size_t buf_size; /* Aligned object size */ - size_t bufctl_dist; /* Distance from buffer to bufctl */ - size_t slab_size; - size_t color; - size_t color_max; - unsigned long bufs_per_slab; - unsigned long nr_objs; /* Number of allocated objects */ - unsigned long nr_bufs; /* Total number of buffers */ - unsigned long nr_slabs; - unsigned long nr_free_slabs; - kmem_cache_ctor_t ctor; - kmem_slab_alloc_fn_t slab_alloc_fn; - kmem_slab_free_fn_t slab_free_fn; - char name[KMEM_NAME_SIZE]; - size_t buftag_dist; /* Distance from buffer to buftag */ - size_t redzone_pad; /* Bytes from end of object to redzone word */ -}; +#include <kern/kmem_i.h> /* * Cache creation flags. |