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- Remove hash functionality from slab in favor of direct lookups
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
parent
1c3832576d
commit
a1502d76ae
@ -403,11 +403,14 @@ kmem_alloc_tryhard(size_t size, size_t *alloc_size, int kmflags)
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/*
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* Slab allocation interfaces
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*/
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#undef KMC_NOTOUCH /* XXX: Unsupported */
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#define KMC_NODEBUG 0x00000000 /* Default behavior */
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#define KMC_NOMAGAZINE /* XXX: Unsupported */
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#define KMC_NOHASH /* XXX: Unsupported */
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#define KMC_QCACHE /* XXX: Unsupported */
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#define KMC_NOTOUCH 0x00000001
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#define KMC_NODEBUG 0x00000002 /* Default behavior */
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#define KMC_NOMAGAZINE 0x00000004 /* XXX: No disable support available */
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#define KMC_NOHASH 0x00000008 /* XXX: No hash available */
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#define KMC_QCACHE 0x00000010 /* XXX: Unsupported */
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#define KMC_KMEM 0x00000100 /* Use kmem cache */
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#define KMC_VMEM 0x00000200 /* Use vmem cache */
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#define KMC_OFFSLAB 0x00000400 /* Objects not on slab */
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#define KMC_REAP_CHUNK 256
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#define KMC_DEFAULT_SEEKS DEFAULT_SEEKS
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@ -462,11 +465,6 @@ extern struct rw_semaphore spl_kmem_cache_sem;
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#define SKS_MAGIC 0x22222222
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#define SKC_MAGIC 0x2c2c2c2c
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#define SPL_KMEM_CACHE_HASH_BITS 12
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#define SPL_KMEM_CACHE_HASH_ELTS (1 << SPL_KMEM_CACHE_HASH_BITS)
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#define SPL_KMEM_CACHE_HASH_SIZE (sizeof(struct hlist_head) * \
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SPL_KMEM_CACHE_HASH_ELTS)
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#define SPL_KMEM_CACHE_DELAY 5
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#define SPL_KMEM_CACHE_OBJ_PER_SLAB 32
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@ -488,7 +486,6 @@ typedef struct spl_kmem_obj {
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void *sko_addr; /* Buffer address */
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struct spl_kmem_slab *sko_slab; /* Owned by slab */
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struct list_head sko_list; /* Free object list linkage */
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struct hlist_node sko_hlist; /* Used object hash linkage */
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} spl_kmem_obj_t;
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typedef struct spl_kmem_slab {
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@ -515,14 +512,9 @@ typedef struct spl_kmem_cache {
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void *skc_vmp; /* Unused */
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uint32_t skc_flags; /* Flags */
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uint32_t skc_obj_size; /* Object size */
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uint32_t skc_chunk_size; /* sizeof(*obj) + alignment */
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uint32_t skc_slab_size; /* slab size */
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uint32_t skc_max_chunks; /* max chunks per slab */
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uint32_t skc_slab_objs; /* Objects per slab */
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uint32_t skc_slab_size; /* Slab size */
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uint32_t skc_delay; /* slab reclaim interval */
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uint32_t skc_hash_bits; /* Hash table bits */
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uint32_t skc_hash_size; /* Hash table size */
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uint32_t skc_hash_elts; /* Hash table elements */
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struct hlist_head *skc_hash; /* Hash table address */
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struct list_head skc_list; /* List of caches linkage */
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struct list_head skc_complete_list;/* Completely alloc'ed */
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struct list_head skc_partial_list; /* Partially alloc'ed */
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@ -536,8 +528,6 @@ typedef struct spl_kmem_cache {
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uint64_t skc_obj_total; /* Obj total current */
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uint64_t skc_obj_alloc; /* Obj alloc current */
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uint64_t skc_obj_max; /* Obj max historic */
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uint64_t skc_hash_depth; /* Lazy hash depth */
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uint64_t skc_hash_count; /* Hash entries current */
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} spl_kmem_cache_t;
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extern spl_kmem_cache_t *
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@ -561,6 +551,8 @@ void spl_kmem_fini(void);
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#define kmem_cache_free(skc, obj) spl_kmem_cache_free(skc, obj)
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#define kmem_cache_reap_now(skc) spl_kmem_cache_reap_now(skc)
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#define kmem_reap() spl_kmem_reap()
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#define kmem_virt(ptr) (((ptr) >= (void *)VMALLOC_START) && \
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((ptr) < (void *)VMALLOC_END))
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#ifdef HAVE_KMEM_CACHE_CREATE_DTOR
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#define __kmem_cache_create(name, size, align, flags, ctor, dtor) \
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@ -114,10 +114,6 @@ EXPORT_SYMBOL(kmem_set_warning);
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* shrink them via spl_slab_reclaim() when they are wasting lots
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* of space. Currently this process is driven by the reapers.
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*
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* XXX: Implement a resizable used object hash. Currently the hash
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* is statically sized for thousands of objects but it should
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* grow based on observed worst case slab depth.
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*
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* XXX: Improve the partial slab list by carefully maintaining a
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* strict ordering of fullest to emptiest slabs based on
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* the slab reference count. This gaurentees the when freeing
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@ -134,20 +130,8 @@ EXPORT_SYMBOL(kmem_set_warning);
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* XXX: Proper hardware cache alignment would be good too.
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*/
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/* Ensure the __kmem_cache_create/__kmem_cache_destroy macros are
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* removed here to prevent a recursive substitution, we want to call
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* the native linux version.
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*/
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#undef kmem_cache_t
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#undef kmem_cache_create
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#undef kmem_cache_destroy
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#undef kmem_cache_alloc
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#undef kmem_cache_free
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struct list_head spl_kmem_cache_list; /* List of caches */
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struct rw_semaphore spl_kmem_cache_sem; /* Cache list lock */
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static kmem_cache_t *spl_slab_cache; /* Cache for slab structs */
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static kmem_cache_t *spl_obj_cache; /* Cache for obj structs */
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static int spl_cache_flush(spl_kmem_cache_t *skc,
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spl_kmem_magazine_t *skm, int flush);
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@ -163,180 +147,119 @@ static struct shrinker spl_kmem_cache_shrinker = {
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};
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#endif
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static void
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spl_slab_init(spl_kmem_cache_t *skc, spl_kmem_slab_t *sks)
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static void *
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kv_alloc(spl_kmem_cache_t *skc, int size, int flags)
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{
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void *ptr;
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if (skc->skc_flags & KMC_KMEM) {
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if (size > (2 * PAGE_SIZE)) {
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ptr = (void *)__get_free_pages(flags, get_order(size));
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} else
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ptr = kmem_alloc(size, flags);
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} else {
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ptr = vmem_alloc(size, flags);
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}
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return ptr;
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}
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static void
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kv_free(spl_kmem_cache_t *skc, void *ptr, int size)
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{
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if (skc->skc_flags & KMC_KMEM) {
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if (size > (2 * PAGE_SIZE))
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free_pages((unsigned long)ptr, get_order(size));
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else
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kmem_free(ptr, size);
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} else {
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vmem_free(ptr, size);
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}
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}
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static spl_kmem_slab_t *
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spl_slab_alloc(spl_kmem_cache_t *skc, int flags)
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{
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spl_kmem_slab_t *sks;
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spl_kmem_obj_t *sko, *n;
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void *base, *obj;
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int i, size, rc = 0;
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/* It's important that we pack the spl_kmem_obj_t structure
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* and the actual objects in to one large address space
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* to minimize the number of calls to the allocator. It
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* is far better to do a few large allocations and then
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* subdivide it ourselves. Now which allocator we use
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* requires balancling a few trade offs.
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*
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* For small objects we use kmem_alloc() because as long
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* as you are only requesting a small number of pages
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* (ideally just one) its cheap. However, when you start
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* requesting multiple pages kmem_alloc() get increasingly
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* expensive since it requires contigeous pages. For this
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* reason we shift to vmem_alloc() for slabs of large
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* objects which removes the need for contigeous pages.
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* We do not use vmem_alloc() in all cases because there
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* is significant locking overhead in __get_vm_area_node().
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* This function takes a single global lock when aquiring
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* an available virtual address range which serialize all
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* vmem_alloc()'s for all slab caches. Using slightly
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* different allocation functions for small and large
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* objects should give us the best of both worlds.
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*
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* sks struct: sizeof(spl_kmem_slab_t)
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* obj data: skc->skc_obj_size
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* obj struct: sizeof(spl_kmem_obj_t)
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* <N obj data + obj structs>
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*
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* XXX: It would probably be a good idea to more carefully
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* align these data structures in memory.
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*/
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base = kv_alloc(skc, skc->skc_slab_size, flags);
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if (base == NULL)
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RETURN(NULL);
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sks = (spl_kmem_slab_t *)base;
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sks->sks_magic = SKS_MAGIC;
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sks->sks_objs = SPL_KMEM_CACHE_OBJ_PER_SLAB;
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sks->sks_objs = skc->skc_slab_objs;
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sks->sks_age = jiffies;
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sks->sks_cache = skc;
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INIT_LIST_HEAD(&sks->sks_list);
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INIT_LIST_HEAD(&sks->sks_free_list);
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sks->sks_ref = 0;
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}
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static int
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spl_slab_alloc_kmem(spl_kmem_cache_t *skc, spl_kmem_slab_t *sks, int flags)
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{
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spl_kmem_obj_t *sko, *n;
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int i, rc = 0;
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/* This is based on the linux slab cache for now simply because
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* it means I get slab coloring, hardware cache alignment, etc
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* for free. There's no reason we can't do this ourselves. And
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* we probably should at in the future. For now I'll just
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* leverage the existing linux slab here. */
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for (i = 0; i < sks->sks_objs; i++) {
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sko = kmem_cache_alloc(spl_obj_cache, flags);
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if (sko == NULL) {
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rc = -ENOMEM;
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break;
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}
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sko->sko_addr = kmem_alloc(skc->skc_obj_size, flags);
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if (sko->sko_addr == NULL) {
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kmem_cache_free(spl_obj_cache, sko);
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rc = -ENOMEM;
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break;
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}
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sko->sko_magic = SKO_MAGIC;
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sko->sko_slab = sks;
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INIT_LIST_HEAD(&sko->sko_list);
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INIT_HLIST_NODE(&sko->sko_hlist);
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list_add(&sko->sko_list, &sks->sks_free_list);
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}
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/* Unable to fully construct slab, unwind everything */
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if (rc) {
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list_for_each_entry_safe(sko, n, &sks->sks_free_list, sko_list) {
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ASSERT(sko->sko_magic == SKO_MAGIC);
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kmem_free(sko->sko_addr, skc->skc_obj_size);
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list_del(&sko->sko_list);
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kmem_cache_free(spl_obj_cache, sko);
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}
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}
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RETURN(rc);
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}
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static spl_kmem_slab_t *
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spl_slab_alloc_vmem(spl_kmem_cache_t *skc, int flags)
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{
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spl_kmem_slab_t *sks;
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spl_kmem_obj_t *sko, *sko_base;
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void *slab, *obj, *obj_base;
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int i, size;
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/* For large vmem_alloc'ed buffers it's important that we pack the
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* spl_kmem_obj_t structure and the actual objects in to one large
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* virtual address zone to minimize the number of calls to
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* vmalloc(). Mapping the virtual address in done under a single
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* global lock which walks a list of all virtual zones. So doing
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* lots of allocations simply results in lock contention and a
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* longer list of mapped addresses. It is far better to do a
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* few large allocations and then subdivide it ourselves. The
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* large vmem_alloc'ed space is divied as follows:
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*
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* 1 slab struct: sizeof(spl_kmem_slab_t)
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* N obj structs: sizeof(spl_kmem_obj_t) * skc->skc_objs
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* N objects: skc->skc_obj_size * skc->skc_objs
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*
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* XXX: It would probably be a good idea to more carefully
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* align the starts of these objects in memory.
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*/
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size = sizeof(spl_kmem_slab_t) + SPL_KMEM_CACHE_OBJ_PER_SLAB *
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(skc->skc_obj_size + sizeof(spl_kmem_obj_t));
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slab = vmem_alloc(size, flags);
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if (slab == NULL)
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RETURN(NULL);
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sks = (spl_kmem_slab_t *)slab;
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spl_slab_init(skc, sks);
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sko_base = (spl_kmem_obj_t *)(slab + sizeof(spl_kmem_slab_t));
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obj_base = (void *)sko_base + sizeof(spl_kmem_obj_t) * sks->sks_objs;
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size = sizeof(spl_kmem_obj_t) + skc->skc_obj_size;
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for (i = 0; i < sks->sks_objs; i++) {
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sko = &sko_base[i];
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obj = obj_base + skc->skc_obj_size * i;
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if (skc->skc_flags & KMC_OFFSLAB) {
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obj = kv_alloc(skc, size, flags);
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if (!obj)
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GOTO(out, rc = -ENOMEM);
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} else {
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obj = base + sizeof(spl_kmem_slab_t) + i * size;
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}
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sko = obj + skc->skc_obj_size;
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sko->sko_addr = obj;
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sko->sko_magic = SKO_MAGIC;
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sko->sko_slab = sks;
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INIT_LIST_HEAD(&sko->sko_list);
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INIT_HLIST_NODE(&sko->sko_hlist);
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list_add_tail(&sko->sko_list, &sks->sks_free_list);
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}
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RETURN(sks);
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}
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static spl_kmem_slab_t *
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spl_slab_alloc(spl_kmem_cache_t *skc, int flags) {
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spl_kmem_slab_t *sks;
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spl_kmem_obj_t *sko;
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int rc;
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ENTRY;
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/* Objects less than a page can use kmem_alloc() and avoid
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* the locking overhead in __get_vm_area_node() when locking
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* for a free address. For objects over a page we use
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* vmem_alloc() because it is usually worth paying this
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* overhead to avoid the need to find contigeous pages.
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* This should give us the best of both worlds. */
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if (skc->skc_obj_size <= PAGE_SIZE) {
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sks = kmem_cache_alloc(spl_slab_cache, flags);
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if (sks == NULL)
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GOTO(out, sks = NULL);
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spl_slab_init(skc, sks);
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rc = spl_slab_alloc_kmem(skc, sks, flags);
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if (rc) {
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kmem_cache_free(spl_slab_cache, sks);
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GOTO(out, sks = NULL);
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}
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} else {
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sks = spl_slab_alloc_vmem(skc, flags);
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if (sks == NULL)
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GOTO(out, sks = NULL);
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}
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ASSERT(sks);
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list_for_each_entry(sko, &sks->sks_free_list, sko_list)
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if (skc->skc_ctor)
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skc->skc_ctor(sko->sko_addr, skc->skc_private, flags);
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out:
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RETURN(sks);
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}
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if (rc) {
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if (skc->skc_flags & KMC_OFFSLAB)
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list_for_each_entry_safe(sko,n,&sks->sks_free_list,sko_list)
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kv_free(skc, sko->sko_addr, size);
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static void
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spl_slab_free_kmem(spl_kmem_cache_t *skc, spl_kmem_slab_t *sks)
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{
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spl_kmem_obj_t *sko, *n;
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ASSERT(skc->skc_magic == SKC_MAGIC);
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ASSERT(sks->sks_magic == SKS_MAGIC);
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list_for_each_entry_safe(sko, n, &sks->sks_free_list, sko_list) {
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ASSERT(sko->sko_magic == SKO_MAGIC);
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kmem_free(sko->sko_addr, skc->skc_obj_size);
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list_del(&sko->sko_list);
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kmem_cache_free(spl_obj_cache, sko);
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kv_free(skc, base, skc->skc_slab_size);
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sks = NULL;
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}
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kmem_cache_free(spl_slab_cache, sks);
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}
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static void
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spl_slab_free_vmem(spl_kmem_cache_t *skc, spl_kmem_slab_t *sks)
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{
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ASSERT(skc->skc_magic == SKC_MAGIC);
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ASSERT(sks->sks_magic == SKS_MAGIC);
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vmem_free(sks, SPL_KMEM_CACHE_OBJ_PER_SLAB *
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(skc->skc_obj_size + sizeof(spl_kmem_obj_t)));
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RETURN(sks);
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}
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/* Removes slab from complete or partial list, so it must
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@ -346,6 +269,7 @@ static void
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spl_slab_free(spl_kmem_slab_t *sks) {
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spl_kmem_cache_t *skc;
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spl_kmem_obj_t *sko, *n;
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int size;
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ENTRY;
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ASSERT(sks->sks_magic == SKS_MAGIC);
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@ -358,17 +282,20 @@ spl_slab_free(spl_kmem_slab_t *sks) {
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skc->skc_obj_total -= sks->sks_objs;
|
||||
skc->skc_slab_total--;
|
||||
list_del(&sks->sks_list);
|
||||
size = sizeof(spl_kmem_obj_t) + skc->skc_obj_size;
|
||||
|
||||
/* Run destructors slab is being released */
|
||||
list_for_each_entry_safe(sko, n, &sks->sks_free_list, sko_list)
|
||||
list_for_each_entry_safe(sko, n, &sks->sks_free_list, sko_list) {
|
||||
ASSERT(sko->sko_magic == SKO_MAGIC);
|
||||
|
||||
if (skc->skc_dtor)
|
||||
skc->skc_dtor(sko->sko_addr, skc->skc_private);
|
||||
|
||||
if (skc->skc_obj_size <= PAGE_SIZE)
|
||||
spl_slab_free_kmem(skc, sks);
|
||||
else
|
||||
spl_slab_free_vmem(skc, sks);
|
||||
if (skc->skc_flags & KMC_OFFSLAB)
|
||||
kv_free(skc, sko->sko_addr, size);
|
||||
}
|
||||
|
||||
kv_free(skc, sks, skc->skc_slab_size);
|
||||
EXIT;
|
||||
}
|
||||
|
||||
@ -449,6 +376,7 @@ spl_magazine_alloc(spl_kmem_cache_t *skc, int node)
|
||||
skm->skm_avail = 0;
|
||||
skm->skm_size = skc->skc_mag_size;
|
||||
skm->skm_refill = skc->skc_mag_refill;
|
||||
if (!(skc->skc_flags & KMC_NOTOUCH))
|
||||
skm->skm_age = jiffies;
|
||||
}
|
||||
|
||||
@ -511,9 +439,14 @@ spl_kmem_cache_create(char *name, size_t size, size_t align,
|
||||
void *priv, void *vmp, int flags)
|
||||
{
|
||||
spl_kmem_cache_t *skc;
|
||||
int i, rc, kmem_flags = KM_SLEEP;
|
||||
uint32_t slab_max, slab_size, slab_objs;
|
||||
int rc, kmem_flags = KM_SLEEP;
|
||||
ENTRY;
|
||||
|
||||
ASSERTF(!(flags & KMC_NOMAGAZINE), "Bad KMC_NOMAGAZINE (%x)\n", flags);
|
||||
ASSERTF(!(flags & KMC_NOHASH), "Bad KMC_NOHASH (%x)\n", flags);
|
||||
ASSERTF(!(flags & KMC_QCACHE), "Bad KMC_QCACHE (%x)\n", flags);
|
||||
|
||||
/* We may be called when there is a non-zero preempt_count or
|
||||
* interrupts are disabled is which case we must not sleep.
|
||||
*/
|
||||
@ -541,25 +474,8 @@ spl_kmem_cache_create(char *name, size_t size, size_t align,
|
||||
skc->skc_vmp = vmp;
|
||||
skc->skc_flags = flags;
|
||||
skc->skc_obj_size = size;
|
||||
skc->skc_chunk_size = 0; /* XXX: Needed only when implementing */
|
||||
skc->skc_slab_size = 0; /* small slab object optimizations */
|
||||
skc->skc_max_chunks = 0; /* which are yet supported. */
|
||||
skc->skc_delay = SPL_KMEM_CACHE_DELAY;
|
||||
|
||||
skc->skc_hash_bits = SPL_KMEM_CACHE_HASH_BITS;
|
||||
skc->skc_hash_size = SPL_KMEM_CACHE_HASH_SIZE;
|
||||
skc->skc_hash_elts = SPL_KMEM_CACHE_HASH_ELTS;
|
||||
skc->skc_hash = (struct hlist_head *)
|
||||
vmem_alloc(skc->skc_hash_size, kmem_flags);
|
||||
if (skc->skc_hash == NULL) {
|
||||
kmem_free(skc->skc_name, skc->skc_name_size);
|
||||
kmem_free(skc, sizeof(*skc));
|
||||
RETURN(NULL);
|
||||
}
|
||||
|
||||
for (i = 0; i < skc->skc_hash_elts; i++)
|
||||
INIT_HLIST_HEAD(&skc->skc_hash[i]);
|
||||
|
||||
INIT_LIST_HEAD(&skc->skc_list);
|
||||
INIT_LIST_HEAD(&skc->skc_complete_list);
|
||||
INIT_LIST_HEAD(&skc->skc_partial_list);
|
||||
@ -573,12 +489,37 @@ spl_kmem_cache_create(char *name, size_t size, size_t align,
|
||||
skc->skc_obj_total = 0;
|
||||
skc->skc_obj_alloc = 0;
|
||||
skc->skc_obj_max = 0;
|
||||
skc->skc_hash_depth = 0;
|
||||
skc->skc_hash_count = 0;
|
||||
|
||||
/* If none passed select a cache type based on object size */
|
||||
if (!(skc->skc_flags & (KMC_KMEM | KMC_VMEM))) {
|
||||
if (skc->skc_obj_size < (PAGE_SIZE / 8)) {
|
||||
skc->skc_flags |= KMC_KMEM;
|
||||
} else {
|
||||
skc->skc_flags |= KMC_VMEM;
|
||||
}
|
||||
}
|
||||
|
||||
/* Size slabs properly so ensure they are not too large */
|
||||
slab_max = ((uint64_t)1 << (MAX_ORDER - 1)) * PAGE_SIZE;
|
||||
if (skc->skc_flags & KMC_OFFSLAB) {
|
||||
skc->skc_slab_objs = SPL_KMEM_CACHE_OBJ_PER_SLAB;
|
||||
skc->skc_slab_size = sizeof(spl_kmem_slab_t);
|
||||
ASSERT(skc->skc_obj_size < slab_max);
|
||||
} else {
|
||||
slab_objs = SPL_KMEM_CACHE_OBJ_PER_SLAB + 1;
|
||||
|
||||
do {
|
||||
slab_objs--;
|
||||
slab_size = sizeof(spl_kmem_slab_t) + slab_objs *
|
||||
(skc->skc_obj_size+sizeof(spl_kmem_obj_t));
|
||||
} while (slab_size > slab_max);
|
||||
|
||||
skc->skc_slab_objs = slab_objs;
|
||||
skc->skc_slab_size = slab_size;
|
||||
}
|
||||
|
||||
rc = spl_magazine_create(skc);
|
||||
if (rc) {
|
||||
vmem_free(skc->skc_hash, skc->skc_hash_size);
|
||||
kmem_free(skc->skc_name, skc->skc_name_size);
|
||||
kmem_free(skc, sizeof(*skc));
|
||||
RETURN(NULL);
|
||||
@ -592,9 +533,6 @@ spl_kmem_cache_create(char *name, size_t size, size_t align,
|
||||
}
|
||||
EXPORT_SYMBOL(spl_kmem_cache_create);
|
||||
|
||||
/* The caller must ensure there are no racing calls to
|
||||
* spl_kmem_cache_alloc() for this spl_kmem_cache_t.
|
||||
*/
|
||||
void
|
||||
spl_kmem_cache_destroy(spl_kmem_cache_t *skc)
|
||||
{
|
||||
@ -613,13 +551,15 @@ spl_kmem_cache_destroy(spl_kmem_cache_t *skc)
|
||||
/* Validate there are no objects in use and free all the
|
||||
* spl_kmem_slab_t, spl_kmem_obj_t, and object buffers. */
|
||||
ASSERT(list_empty(&skc->skc_complete_list));
|
||||
ASSERTF(skc->skc_hash_count == 0, "skc->skc_hash_count=%d\n",
|
||||
skc->skc_hash_count);
|
||||
ASSERT(skc->skc_slab_alloc == 0);
|
||||
ASSERT(skc->skc_obj_alloc == 0);
|
||||
|
||||
list_for_each_entry_safe(sks, m, &skc->skc_partial_list, sks_list)
|
||||
spl_slab_free(sks);
|
||||
|
||||
vmem_free(skc->skc_hash, skc->skc_hash_size);
|
||||
ASSERT(skc->skc_slab_total == 0);
|
||||
ASSERT(skc->skc_obj_total == 0);
|
||||
|
||||
kmem_free(skc->skc_name, skc->skc_name_size);
|
||||
spin_unlock(&skc->skc_lock);
|
||||
|
||||
@ -629,64 +569,25 @@ spl_kmem_cache_destroy(spl_kmem_cache_t *skc)
|
||||
}
|
||||
EXPORT_SYMBOL(spl_kmem_cache_destroy);
|
||||
|
||||
/* The kernel provided hash_ptr() function behaves exceptionally badly
|
||||
* when all the addresses are page aligned which is likely the case
|
||||
* here. To avoid this issue shift off the low order non-random bits.
|
||||
*/
|
||||
static unsigned long
|
||||
spl_hash_ptr(void *ptr, unsigned int bits)
|
||||
{
|
||||
return hash_long((unsigned long)ptr >> PAGE_SHIFT, bits);
|
||||
}
|
||||
|
||||
static spl_kmem_obj_t *
|
||||
spl_hash_obj(spl_kmem_cache_t *skc, void *obj)
|
||||
{
|
||||
struct hlist_node *node;
|
||||
spl_kmem_obj_t *sko = NULL;
|
||||
unsigned long key = spl_hash_ptr(obj, skc->skc_hash_bits);
|
||||
int i = 0;
|
||||
|
||||
ASSERT(skc->skc_magic == SKC_MAGIC);
|
||||
ASSERT(spin_is_locked(&skc->skc_lock));
|
||||
|
||||
hlist_for_each_entry(sko, node, &skc->skc_hash[key], sko_hlist) {
|
||||
|
||||
if (unlikely((++i) > skc->skc_hash_depth))
|
||||
skc->skc_hash_depth = i;
|
||||
|
||||
if (sko->sko_addr == obj) {
|
||||
ASSERT(sko->sko_magic == SKO_MAGIC);
|
||||
RETURN(sko);
|
||||
}
|
||||
}
|
||||
|
||||
RETURN(NULL);
|
||||
}
|
||||
|
||||
static void *
|
||||
spl_cache_obj(spl_kmem_cache_t *skc, spl_kmem_slab_t *sks)
|
||||
{
|
||||
spl_kmem_obj_t *sko;
|
||||
unsigned long key;
|
||||
|
||||
ASSERT(skc->skc_magic == SKC_MAGIC);
|
||||
ASSERT(sks->sks_magic == SKS_MAGIC);
|
||||
ASSERT(spin_is_locked(&skc->skc_lock));
|
||||
|
||||
sko = list_entry((&sks->sks_free_list)->next,spl_kmem_obj_t,sko_list);
|
||||
sko = list_entry(sks->sks_free_list.next, spl_kmem_obj_t, sko_list);
|
||||
ASSERT(sko->sko_magic == SKO_MAGIC);
|
||||
ASSERT(sko->sko_addr != NULL);
|
||||
|
||||
/* Remove from sks_free_list and add to used hash */
|
||||
/* Remove from sks_free_list */
|
||||
list_del_init(&sko->sko_list);
|
||||
key = spl_hash_ptr(sko->sko_addr, skc->skc_hash_bits);
|
||||
hlist_add_head(&sko->sko_hlist, &skc->skc_hash[key]);
|
||||
|
||||
sks->sks_age = jiffies;
|
||||
sks->sks_ref++;
|
||||
skc->skc_obj_alloc++;
|
||||
skc->skc_hash_count++;
|
||||
|
||||
/* Track max obj usage statistics */
|
||||
if (skc->skc_obj_alloc > skc->skc_obj_max)
|
||||
@ -818,22 +719,17 @@ spl_cache_shrink(spl_kmem_cache_t *skc, void *obj)
|
||||
ASSERT(skc->skc_magic == SKC_MAGIC);
|
||||
ASSERT(spin_is_locked(&skc->skc_lock));
|
||||
|
||||
sko = spl_hash_obj(skc, obj);
|
||||
ASSERTF(sko, "Obj %p missing from in-use hash (%d/%d) for cache %s\n",
|
||||
obj, skc->skc_hash_depth, skc->skc_hash_count, skc->skc_name);
|
||||
sko = obj + skc->skc_obj_size;
|
||||
ASSERT(sko->sko_magic == SKO_MAGIC);
|
||||
|
||||
sks = sko->sko_slab;
|
||||
ASSERTF(sks, "Obj %p/%p linked to invalid slab for cache %s\n",
|
||||
obj, sko, skc->skc_name);
|
||||
|
||||
ASSERT(sks->sks_magic == SKS_MAGIC);
|
||||
ASSERT(sks->sks_cache == skc);
|
||||
hlist_del_init(&sko->sko_hlist);
|
||||
list_add(&sko->sko_list, &sks->sks_free_list);
|
||||
|
||||
sks->sks_age = jiffies;
|
||||
sks->sks_ref--;
|
||||
skc->skc_obj_alloc--;
|
||||
skc->skc_hash_count--;
|
||||
|
||||
/* Move slab to skc_partial_list when no longer full. Slabs
|
||||
* are added to the head to keep the partial list is quasi-full
|
||||
@ -906,6 +802,7 @@ restart:
|
||||
if (likely(skm->skm_avail)) {
|
||||
/* Object available in CPU cache, use it */
|
||||
obj = skm->skm_objs[--skm->skm_avail];
|
||||
if (!(skc->skc_flags & KMC_NOTOUCH))
|
||||
skm->skm_age = jiffies;
|
||||
} else {
|
||||
/* Per-CPU cache empty, directly allocate from
|
||||
@ -1012,71 +909,6 @@ spl_kmem_reap(void)
|
||||
}
|
||||
EXPORT_SYMBOL(spl_kmem_reap);
|
||||
|
||||
int
|
||||
spl_kmem_init(void)
|
||||
{
|
||||
int rc = 0;
|
||||
ENTRY;
|
||||
|
||||
init_rwsem(&spl_kmem_cache_sem);
|
||||
INIT_LIST_HEAD(&spl_kmem_cache_list);
|
||||
|
||||
spl_slab_cache = NULL;
|
||||
spl_obj_cache = NULL;
|
||||
|
||||
spl_slab_cache = __kmem_cache_create("spl_slab_cache",
|
||||
sizeof(spl_kmem_slab_t),
|
||||
0, 0, NULL, NULL);
|
||||
if (spl_slab_cache == NULL)
|
||||
GOTO(out_cache, rc = -ENOMEM);
|
||||
|
||||
spl_obj_cache = __kmem_cache_create("spl_obj_cache",
|
||||
sizeof(spl_kmem_obj_t),
|
||||
0, 0, NULL, NULL);
|
||||
if (spl_obj_cache == NULL)
|
||||
GOTO(out_cache, rc = -ENOMEM);
|
||||
|
||||
#ifdef HAVE_SET_SHRINKER
|
||||
spl_kmem_cache_shrinker = set_shrinker(KMC_DEFAULT_SEEKS,
|
||||
spl_kmem_cache_generic_shrinker);
|
||||
if (spl_kmem_cache_shrinker == NULL)
|
||||
GOTO(out_cache, rc = -ENOMEM);
|
||||
#else
|
||||
register_shrinker(&spl_kmem_cache_shrinker);
|
||||
#endif
|
||||
|
||||
#ifdef DEBUG_KMEM
|
||||
atomic64_set(&kmem_alloc_used, 0);
|
||||
atomic64_set(&vmem_alloc_used, 0);
|
||||
|
||||
#ifdef DEBUG_KMEM_TRACKING
|
||||
{ int i;
|
||||
spin_lock_init(&kmem_lock);
|
||||
INIT_LIST_HEAD(&kmem_list);
|
||||
|
||||
for (i = 0; i < KMEM_TABLE_SIZE; i++)
|
||||
INIT_HLIST_HEAD(&kmem_table[i]);
|
||||
|
||||
spin_lock_init(&vmem_lock);
|
||||
INIT_LIST_HEAD(&vmem_list);
|
||||
|
||||
for (i = 0; i < VMEM_TABLE_SIZE; i++)
|
||||
INIT_HLIST_HEAD(&vmem_table[i]);
|
||||
}
|
||||
#endif
|
||||
#endif
|
||||
RETURN(rc);
|
||||
|
||||
out_cache:
|
||||
if (spl_obj_cache)
|
||||
(void)kmem_cache_destroy(spl_obj_cache);
|
||||
|
||||
if (spl_slab_cache)
|
||||
(void)kmem_cache_destroy(spl_slab_cache);
|
||||
|
||||
RETURN(rc);
|
||||
}
|
||||
|
||||
#if defined(DEBUG_KMEM) && defined(DEBUG_KMEM_TRACKING)
|
||||
static char *
|
||||
spl_sprintf_addr(kmem_debug_t *kd, char *str, int len, int min)
|
||||
@ -1119,12 +951,28 @@ spl_sprintf_addr(kmem_debug_t *kd, char *str, int len, int min)
|
||||
return str;
|
||||
}
|
||||
|
||||
static int
|
||||
spl_kmem_init_tracking(struct list_head *list, spinlock_t *lock, int size)
|
||||
{
|
||||
int i;
|
||||
ENTRY;
|
||||
|
||||
spin_lock_init(lock);
|
||||
INIT_LIST_HEAD(list);
|
||||
|
||||
for (i = 0; i < size; i++)
|
||||
INIT_HLIST_HEAD(&kmem_table[i]);
|
||||
|
||||
RETURN(0);
|
||||
}
|
||||
|
||||
static void
|
||||
spl_kmem_fini_tracking(struct list_head *list, spinlock_t *lock)
|
||||
{
|
||||
unsigned long flags;
|
||||
kmem_debug_t *kd;
|
||||
char str[17];
|
||||
ENTRY;
|
||||
|
||||
spin_lock_irqsave(lock, flags);
|
||||
if (!list_empty(list))
|
||||
@ -1138,11 +986,42 @@ spl_kmem_fini_tracking(struct list_head *list, spinlock_t *lock)
|
||||
kd->kd_func, kd->kd_line);
|
||||
|
||||
spin_unlock_irqrestore(lock, flags);
|
||||
EXIT;
|
||||
}
|
||||
#else /* DEBUG_KMEM && DEBUG_KMEM_TRACKING */
|
||||
#define spl_kmem_init_tracking(list, lock, size)
|
||||
#define spl_kmem_fini_tracking(list, lock)
|
||||
#endif /* DEBUG_KMEM && DEBUG_KMEM_TRACKING */
|
||||
|
||||
int
|
||||
spl_kmem_init(void)
|
||||
{
|
||||
int rc = 0;
|
||||
ENTRY;
|
||||
|
||||
init_rwsem(&spl_kmem_cache_sem);
|
||||
INIT_LIST_HEAD(&spl_kmem_cache_list);
|
||||
|
||||
#ifdef HAVE_SET_SHRINKER
|
||||
spl_kmem_cache_shrinker = set_shrinker(KMC_DEFAULT_SEEKS,
|
||||
spl_kmem_cache_generic_shrinker);
|
||||
if (spl_kmem_cache_shrinker == NULL)
|
||||
GOTO(out, rc = -ENOMEM);
|
||||
#else
|
||||
register_shrinker(&spl_kmem_cache_shrinker);
|
||||
#endif
|
||||
|
||||
#ifdef DEBUG_KMEM
|
||||
atomic64_set(&kmem_alloc_used, 0);
|
||||
atomic64_set(&vmem_alloc_used, 0);
|
||||
|
||||
spl_kmem_init_tracking(&kmem_list, &kmem_lock, KMEM_TABLE_SIZE);
|
||||
spl_kmem_init_tracking(&vmem_list, &vmem_lock, VMEM_TABLE_SIZE);
|
||||
#endif
|
||||
out:
|
||||
RETURN(rc);
|
||||
}
|
||||
|
||||
void
|
||||
spl_kmem_fini(void)
|
||||
{
|
||||
@ -1171,8 +1050,5 @@ spl_kmem_fini(void)
|
||||
unregister_shrinker(&spl_kmem_cache_shrinker);
|
||||
#endif
|
||||
|
||||
(void)kmem_cache_destroy(spl_obj_cache);
|
||||
(void)kmem_cache_destroy(spl_slab_cache);
|
||||
|
||||
EXIT;
|
||||
}
|
||||
|
||||
@ -577,14 +577,10 @@ slab_seq_show(struct seq_file *f, void *p)
|
||||
|
||||
spin_lock(&skc->skc_lock);
|
||||
seq_printf(f, "%-36s ", skc->skc_name);
|
||||
seq_printf(f, "%u %u %u - %u %u %u - "
|
||||
"%lu %lu %lu - %lu %lu %lu - %lu %lu %lu - %lu %lu\n",
|
||||
seq_printf(f, "%u %u %u - %lu %lu %lu - %lu %lu %lu - %lu %lu %lu\n",
|
||||
(unsigned)skc->skc_obj_size,
|
||||
(unsigned)skc->skc_chunk_size,
|
||||
(unsigned)skc->skc_slab_objs,
|
||||
(unsigned)skc->skc_slab_size,
|
||||
(unsigned)skc->skc_hash_bits,
|
||||
(unsigned)skc->skc_hash_size,
|
||||
(unsigned)skc->skc_hash_elts,
|
||||
(long unsigned)skc->skc_slab_fail,
|
||||
(long unsigned)skc->skc_slab_create,
|
||||
(long unsigned)skc->skc_slab_destroy,
|
||||
@ -593,9 +589,7 @@ slab_seq_show(struct seq_file *f, void *p)
|
||||
(long unsigned)skc->skc_slab_max,
|
||||
(long unsigned)skc->skc_obj_total,
|
||||
(long unsigned)skc->skc_obj_alloc,
|
||||
(long unsigned)skc->skc_obj_max,
|
||||
(long unsigned)skc->skc_hash_depth,
|
||||
(long unsigned)skc->skc_hash_count);
|
||||
(long unsigned)skc->skc_obj_max);
|
||||
|
||||
spin_unlock(&skc->skc_lock);
|
||||
|
||||
|
||||
@ -371,18 +371,40 @@ out_free:
|
||||
return rc;
|
||||
}
|
||||
|
||||
/* Validate small object cache behavior for dynamic/kmem/vmem caches */
|
||||
static int
|
||||
splat_kmem_test5(struct file *file, void *arg)
|
||||
{
|
||||
return splat_kmem_cache_size_test(file, arg, SPLAT_KMEM_TEST5_NAME,
|
||||
sizeof(kmem_cache_data_t) * 1, 0);
|
||||
char *name = SPLAT_KMEM_TEST5_NAME;
|
||||
int rc;
|
||||
|
||||
rc = splat_kmem_cache_size_test(file, arg, name, 128, 0);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
rc = splat_kmem_cache_size_test(file, arg, name, 128, KMC_KMEM);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
return splat_kmem_cache_size_test(file, arg, name, 128, KMC_VMEM);
|
||||
}
|
||||
|
||||
/* Validate large object cache behavior for dynamic/kmem/vmem caches */
|
||||
static int
|
||||
splat_kmem_test6(struct file *file, void *arg)
|
||||
{
|
||||
return splat_kmem_cache_size_test(file, arg, SPLAT_KMEM_TEST6_NAME,
|
||||
sizeof(kmem_cache_data_t) * 1024, 0);
|
||||
char *name = SPLAT_KMEM_TEST6_NAME;
|
||||
int rc;
|
||||
|
||||
rc = splat_kmem_cache_size_test(file, arg, name, 128 * 1024, 0);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
rc = splat_kmem_cache_size_test(file, arg, name, 128 * 1024, KMC_KMEM);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
return splat_kmem_cache_size_test(file, arg, name, 128 * 1028, KMC_VMEM);
|
||||
}
|
||||
|
||||
static void
|
||||
@ -533,11 +555,12 @@ splat_kmem_test8_thread(void *arg)
|
||||
vmem_free(objs, count * sizeof(void *));
|
||||
out:
|
||||
spin_lock(&kcp->kcp_lock);
|
||||
kcp->kcp_threads--;
|
||||
if (!kcp->kcp_rc)
|
||||
kcp->kcp_rc = rc;
|
||||
|
||||
if (--kcp->kcp_threads == 0)
|
||||
wake_up(&kcp->kcp_waitq);
|
||||
|
||||
spin_unlock(&kcp->kcp_lock);
|
||||
|
||||
thread_exit();
|
||||
@ -573,7 +596,7 @@ splat_kmem_test8_sc(struct file *file, void *arg, int size, int count)
|
||||
splat_vprint(file, SPLAT_KMEM_TEST8_NAME, "%-22s %s", "name",
|
||||
"time (sec)\tslabs \tobjs \thash\n");
|
||||
splat_vprint(file, SPLAT_KMEM_TEST8_NAME, "%-22s %s", "",
|
||||
" \ttot/max/calc\ttot/max/calc\tsize/depth\n");
|
||||
" \ttot/max/calc\ttot/max/calc\n");
|
||||
|
||||
for (i = 1; i <= count; i *= 2) {
|
||||
kcp.kcp_size = size;
|
||||
@ -611,7 +634,7 @@ splat_kmem_test8_sc(struct file *file, void *arg, int size, int count)
|
||||
delta = timespec_sub(stop, start);
|
||||
|
||||
splat_vprint(file, SPLAT_KMEM_TEST8_NAME, "%-22s %2ld.%09ld\t"
|
||||
"%lu/%lu/%lu\t%lu/%lu/%lu\t%lu/%lu\n",
|
||||
"%lu/%lu/%lu\t%lu/%lu/%lu\n",
|
||||
kcp.kcp_cache->skc_name,
|
||||
delta.tv_sec, delta.tv_nsec,
|
||||
(unsigned long)kcp.kcp_cache->skc_slab_total,
|
||||
@ -620,9 +643,7 @@ splat_kmem_test8_sc(struct file *file, void *arg, int size, int count)
|
||||
SPL_KMEM_CACHE_OBJ_PER_SLAB),
|
||||
(unsigned long)kcp.kcp_cache->skc_obj_total,
|
||||
(unsigned long)kcp.kcp_cache->skc_obj_max,
|
||||
(unsigned long)(kcp.kcp_alloc * threads),
|
||||
(unsigned long)kcp.kcp_cache->skc_hash_size,
|
||||
(unsigned long)kcp.kcp_cache->skc_hash_depth);
|
||||
(unsigned long)(kcp.kcp_alloc * threads));
|
||||
|
||||
kmem_cache_destroy(kcp.kcp_cache);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user