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- Remove hash functionality from slab in favor of direct lookups

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based of the spl_kmem_obj_t tacked on the end of each object.
  This actually isn't so back because we are now allocing large
  chunks for the slab and partitioning it ourselves.  So there's
  not a ton of wasted space.  We may suffer a performance hit
  however due to alignment issues.

- Remove remaining depenancies on the linux slab implementation.
  We're standing on our own now for better or worse.

- Rework slabs to be either kmem or vmem based.  If neither
  KMC_VMEM of KMC_KMEM are specified we make a decent guess
  about what will work best for their based on the object 
  size.  Additionally we provide a kmem_virt() function caller
  can use to see if they have a virtual or physical address.

- Minor fixups in the test suite.



git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@141 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
This commit is contained in:
behlendo
2008-07-01 03:28:54 +00:00
parent 1c3832576d
commit a1502d76ae
4 changed files with 241 additions and 358 deletions
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include/sys/kmem.h
+12 -20
View File
@@ -403,11 +403,14 @@ kmem_alloc_tryhard(size_t size, size_t *alloc_size, int kmflags)
/*
* Slab allocation interfaces
*/
#undef KMC_NOTOUCH /* XXX: Unsupported */
#define KMC_NODEBUG 0x00000000 /* Default behavior */
#define KMC_NOMAGAZINE /* XXX: Unsupported */
#define KMC_NOHASH /* XXX: Unsupported */
#define KMC_QCACHE /* XXX: Unsupported */
#define KMC_NOTOUCH 0x00000001
#define KMC_NODEBUG 0x00000002 /* Default behavior */
#define KMC_NOMAGAZINE 0x00000004 /* XXX: No disable support available */
#define KMC_NOHASH 0x00000008 /* XXX: No hash available */
#define KMC_QCACHE 0x00000010 /* XXX: Unsupported */
#define KMC_KMEM 0x00000100 /* Use kmem cache */
#define KMC_VMEM 0x00000200 /* Use vmem cache */
#define KMC_OFFSLAB 0x00000400 /* Objects not on slab */
#define KMC_REAP_CHUNK 256
#define KMC_DEFAULT_SEEKS DEFAULT_SEEKS
@@ -462,11 +465,6 @@ extern struct rw_semaphore spl_kmem_cache_sem;
#define SKS_MAGIC 0x22222222
#define SKC_MAGIC 0x2c2c2c2c
#define SPL_KMEM_CACHE_HASH_BITS 12
#define SPL_KMEM_CACHE_HASH_ELTS (1 << SPL_KMEM_CACHE_HASH_BITS)
#define SPL_KMEM_CACHE_HASH_SIZE (sizeof(struct hlist_head) * \
SPL_KMEM_CACHE_HASH_ELTS)
#define SPL_KMEM_CACHE_DELAY 5
#define SPL_KMEM_CACHE_OBJ_PER_SLAB 32
@@ -488,7 +486,6 @@ typedef struct spl_kmem_obj {
void *sko_addr; /* Buffer address */
struct spl_kmem_slab *sko_slab; /* Owned by slab */
struct list_head sko_list; /* Free object list linkage */
struct hlist_node sko_hlist; /* Used object hash linkage */
} spl_kmem_obj_t;
typedef struct spl_kmem_slab {
@@ -515,14 +512,9 @@ typedef struct spl_kmem_cache {
void *skc_vmp; /* Unused */
uint32_t skc_flags; /* Flags */
uint32_t skc_obj_size; /* Object size */
uint32_t skc_chunk_size; /* sizeof(*obj) + alignment */
uint32_t skc_slab_size; /* slab size */
uint32_t skc_max_chunks; /* max chunks per slab */
uint32_t skc_slab_objs; /* Objects per slab */
uint32_t skc_slab_size; /* Slab size */
uint32_t skc_delay; /* slab reclaim interval */
uint32_t skc_hash_bits; /* Hash table bits */
uint32_t skc_hash_size; /* Hash table size */
uint32_t skc_hash_elts; /* Hash table elements */
struct hlist_head *skc_hash; /* Hash table address */
struct list_head skc_list; /* List of caches linkage */
struct list_head skc_complete_list;/* Completely alloc'ed */
struct list_head skc_partial_list; /* Partially alloc'ed */
@@ -536,8 +528,6 @@ typedef struct spl_kmem_cache {
uint64_t skc_obj_total; /* Obj total current */
uint64_t skc_obj_alloc; /* Obj alloc current */
uint64_t skc_obj_max; /* Obj max historic */
uint64_t skc_hash_depth; /* Lazy hash depth */
uint64_t skc_hash_count; /* Hash entries current */
} spl_kmem_cache_t;
extern spl_kmem_cache_t *
@@ -561,6 +551,8 @@ void spl_kmem_fini(void);
#define kmem_cache_free(skc, obj) spl_kmem_cache_free(skc, obj)
#define kmem_cache_reap_now(skc) spl_kmem_cache_reap_now(skc)
#define kmem_reap() spl_kmem_reap()
#define kmem_virt(ptr) (((ptr) >= (void *)VMALLOC_START) && \
((ptr) < (void *)VMALLOC_END))
#ifdef HAVE_KMEM_CACHE_CREATE_DTOR
#define __kmem_cache_create(name, size, align, flags, ctor, dtor) \