Merge branch 'linux-2.6'

1 files changed, 3520 insertions, 0 deletions

diff --git a/mm/slub.c b/mm/slub.c
new file mode 100644
index 000000000000..5db3da5a60bf
--- /dev/null
+++ b/mm/slub.c
@@ -0,0 +1,3520 @@
+/*
+ * SLUB: A slab allocator that limits cache line use instead of queuing
+ * objects in per cpu and per node lists.
+ *
+ * The allocator synchronizes using per slab locks and only
+ * uses a centralized lock to manage a pool of partial slabs.
+ *
+ * (C) 2007 SGI, Christoph Lameter <clameter@sgi.com>
+ */
+
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/bit_spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/bitops.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+#include <linux/cpu.h>
+#include <linux/cpuset.h>
+#include <linux/mempolicy.h>
+#include <linux/ctype.h>
+#include <linux/kallsyms.h>
+
+/*
+ * Lock order:
+ *   1. slab_lock(page)
+ *   2. slab->list_lock
+ *
+ *   The slab_lock protects operations on the object of a particular
+ *   slab and its metadata in the page struct. If the slab lock
+ *   has been taken then no allocations nor frees can be performed
+ *   on the objects in the slab nor can the slab be added or removed
+ *   from the partial or full lists since this would mean modifying
+ *   the page_struct of the slab.
+ *
+ *   The list_lock protects the partial and full list on each node and
+ *   the partial slab counter. If taken then no new slabs may be added or
+ *   removed from the lists nor make the number of partial slabs be modified.
+ *   (Note that the total number of slabs is an atomic value that may be
+ *   modified without taking the list lock).
+ *
+ *   The list_lock is a centralized lock and thus we avoid taking it as
+ *   much as possible. As long as SLUB does not have to handle partial
+ *   slabs, operations can continue without any centralized lock. F.e.
+ *   allocating a long series of objects that fill up slabs does not require
+ *   the list lock.
+ *
+ *   The lock order is sometimes inverted when we are trying to get a slab
+ *   off a list. We take the list_lock and then look for a page on the list
+ *   to use. While we do that objects in the slabs may be freed. We can
+ *   only operate on the slab if we have also taken the slab_lock. So we use
+ *   a slab_trylock() on the slab. If trylock was successful then no frees
+ *   can occur anymore and we can use the slab for allocations etc. If the
+ *   slab_trylock() does not succeed then frees are in progress in the slab and
+ *   we must stay away from it for a while since we may cause a bouncing
+ *   cacheline if we try to acquire the lock. So go onto the next slab.
+ *   If all pages are busy then we may allocate a new slab instead of reusing
+ *   a partial slab. A new slab has noone operating on it and thus there is
+ *   no danger of cacheline contention.
+ *
+ *   Interrupts are disabled during allocation and deallocation in order to
+ *   make the slab allocator safe to use in the context of an irq. In addition
+ *   interrupts are disabled to ensure that the processor does not change
+ *   while handling per_cpu slabs, due to kernel preemption.
+ *
+ * SLUB assigns one slab for allocation to each processor.
+ * Allocations only occur from these slabs called cpu slabs.
+ *
+ * Slabs with free elements are kept on a partial list.
+ * There is no list for full slabs. If an object in a full slab is
+ * freed then the slab will show up again on the partial lists.
+ * Otherwise there is no need to track full slabs unless we have to
+ * track full slabs for debugging purposes.
+ *
+ * Slabs are freed when they become empty. Teardown and setup is
+ * minimal so we rely on the page allocators per cpu caches for
+ * fast frees and allocs.
+ *
+ * Overloading of page flags that are otherwise used for LRU management.
+ *
+ * PageActive 		The slab is used as a cpu cache. Allocations
+ * 			may be performed from the slab. The slab is not
+ * 			on any slab list and cannot be moved onto one.
+ *
+ * PageError		Slab requires special handling due to debug
+ * 			options set. This moves	slab handling out of
+ * 			the fast path.
+ */
+
+/*
+ * Issues still to be resolved:
+ *
+ * - The per cpu array is updated for each new slab and and is a remote
+ *   cacheline for most nodes. This could become a bouncing cacheline given
+ *   enough frequent updates. There are 16 pointers in a cacheline.so at
+ *   max 16 cpus could compete. Likely okay.
+ *
+ * - Support PAGE_ALLOC_DEBUG. Should be easy to do.
+ *
+ * - Variable sizing of the per node arrays
+ */
+
+/* Enable to test recovery from slab corruption on boot */
+#undef SLUB_RESILIENCY_TEST
+
+#if PAGE_SHIFT <= 12
+
+/*
+ * Small page size. Make sure that we do not fragment memory
+ */
+#define DEFAULT_MAX_ORDER 1
+#define DEFAULT_MIN_OBJECTS 4
+
+#else
+
+/*
+ * Large page machines are customarily able to handle larger
+ * page orders.
+ */
+#define DEFAULT_MAX_ORDER 2
+#define DEFAULT_MIN_OBJECTS 8
+
+#endif
+
+/*
+ * Mininum number of partial slabs. These will be left on the partial
+ * lists even if they are empty. kmem_cache_shrink may reclaim them.
+ */
+#define MIN_PARTIAL 2
+
+/*
+ * Maximum number of desirable partial slabs.
+ * The existence of more partial slabs makes kmem_cache_shrink
+ * sort the partial list by the number of objects in the.
+ */
+#define MAX_PARTIAL 10
+
+#define DEBUG_DEFAULT_FLAGS (SLAB_DEBUG_FREE | SLAB_RED_ZONE | \
+				SLAB_POISON | SLAB_STORE_USER)
+/*
+ * Set of flags that will prevent slab merging
+ */
+#define SLUB_NEVER_MERGE (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
+		SLAB_TRACE | SLAB_DESTROY_BY_RCU)
+
+#define SLUB_MERGE_SAME (SLAB_DEBUG_FREE | SLAB_RECLAIM_ACCOUNT | \
+		SLAB_CACHE_DMA)
+
+#ifndef ARCH_KMALLOC_MINALIGN
+#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)
+#endif
+
+#ifndef ARCH_SLAB_MINALIGN
+#define ARCH_SLAB_MINALIGN __alignof__(unsigned long long)
+#endif
+
+/* Internal SLUB flags */
+#define __OBJECT_POISON 0x80000000	/* Poison object */
+
+static int kmem_size = sizeof(struct kmem_cache);
+
+#ifdef CONFIG_SMP
+static struct notifier_block slab_notifier;
+#endif
+
+static enum {
+	DOWN,		/* No slab functionality available */
+	PARTIAL,	/* kmem_cache_open() works but kmalloc does not */
+	UP,		/* Everything works */
+	SYSFS		/* Sysfs up */
+} slab_state = DOWN;
+
+/* A list of all slab caches on the system */
+static DECLARE_RWSEM(slub_lock);
+LIST_HEAD(slab_caches);
+
+#ifdef CONFIG_SYSFS
+static int sysfs_slab_add(struct kmem_cache *);
+static int sysfs_slab_alias(struct kmem_cache *, const char *);
+static void sysfs_slab_remove(struct kmem_cache *);
+#else
+static int sysfs_slab_add(struct kmem_cache *s) { return 0; }
+static int sysfs_slab_alias(struct kmem_cache *s, const char *p) { return 0; }
+static void sysfs_slab_remove(struct kmem_cache *s) {}
+#endif
+
+/********************************************************************
+ * 			Core slab cache functions
+ *******************************************************************/
+
+int slab_is_available(void)
+{
+	return slab_state >= UP;
+}
+
+static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node)
+{
+#ifdef CONFIG_NUMA
+	return s->node[node];
+#else
+	return &s->local_node;
+#endif
+}
+
+/*
+ * Object debugging
+ */
+static void print_section(char *text, u8 *addr, unsigned int length)
+{
+	int i, offset;
+	int newline = 1;
+	char ascii[17];
+
+	ascii[16] = 0;
+
+	for (i = 0; i < length; i++) {
+		if (newline) {
+			printk(KERN_ERR "%10s 0x%p: ", text, addr + i);
+			newline = 0;
+		}
+		printk(" %02x", addr[i]);
+		offset = i % 16;
+		ascii[offset] = isgraph(addr[i]) ? addr[i] : '.';
+		if (offset == 15) {
+			printk(" %s\n",ascii);
+			newline = 1;
+		}
+	}
+	if (!newline) {
+		i %= 16;
+		while (i < 16) {
+			printk("   ");
+			ascii[i] = ' ';
+			i++;
+		}
+		printk(" %s\n", ascii);
+	}
+}
+
+/*
+ * Slow version of get and set free pointer.
+ *
+ * This requires touching the cache lines of kmem_cache.
+ * The offset can also be obtained from the page. In that
+ * case it is in the cacheline that we already need to touch.
+ */
+static void *get_freepointer(struct kmem_cache *s, void *object)
+{
+	return *(void **)(object + s->offset);
+}
+
+static void set_freepointer(struct kmem_cache *s, void *object, void *fp)
+{
+	*(void **)(object + s->offset) = fp;
+}
+
+/*
+ * Tracking user of a slab.
+ */
+struct track {
+	void *addr;		/* Called from address */
+	int cpu;		/* Was running on cpu */
+	int pid;		/* Pid context */
+	unsigned long when;	/* When did the operation occur */
+};
+
+enum track_item { TRACK_ALLOC, TRACK_FREE };
+
+static struct track *get_track(struct kmem_cache *s, void *object,
+	enum track_item alloc)
+{
+	struct track *p;
+
+	if (s->offset)
+		p = object + s->offset + sizeof(void *);
+	else
+		p = object + s->inuse;
+
+	return p + alloc;
+}
+
+static void set_track(struct kmem_cache *s, void *object,
+				enum track_item alloc, void *addr)
+{
+	struct track *p;
+
+	if (s->offset)
+		p = object + s->offset + sizeof(void *);
+	else
+		p = object + s->inuse;
+
+	p += alloc;
+	if (addr) {
+		p->addr = addr;
+		p->cpu = smp_processor_id();
+		p->pid = current ? current->pid : -1;
+		p->when = jiffies;
+	} else
+		memset(p, 0, sizeof(struct track));
+}
+
+static void init_tracking(struct kmem_cache *s, void *object)
+{
+	if (s->flags & SLAB_STORE_USER) {
+		set_track(s, object, TRACK_FREE, NULL);
+		set_track(s, object, TRACK_ALLOC, NULL);
+	}
+}
+
+static void print_track(const char *s, struct track *t)
+{
+	if (!t->addr)
+		return;
+
+	printk(KERN_ERR "%s: ", s);
+	__print_symbol("%s", (unsigned long)t->addr);
+	printk(" jiffies_ago=%lu cpu=%u pid=%d\n", jiffies - t->when, t->cpu, t->pid);
+}
+
+static void print_trailer(struct kmem_cache *s, u8 *p)
+{
+	unsigned int off;	/* Offset of last byte */
+
+	if (s->flags & SLAB_RED_ZONE)
+		print_section("Redzone", p + s->objsize,
+			s->inuse - s->objsize);
+
+	printk(KERN_ERR "FreePointer 0x%p -> 0x%p\n",
+			p + s->offset,
+			get_freepointer(s, p));
+
+	if (s->offset)
+		off = s->offset + sizeof(void *);
+	else
+		off = s->inuse;
+
+	if (s->flags & SLAB_STORE_USER) {
+		print_track("Last alloc", get_track(s, p, TRACK_ALLOC));
+		print_track("Last free ", get_track(s, p, TRACK_FREE));
+		off += 2 * sizeof(struct track);
+	}
+
+	if (off != s->size)
+		/* Beginning of the filler is the free pointer */
+		print_section("Filler", p + off, s->size - off);
+}
+
+static void object_err(struct kmem_cache *s, struct page *page,
+			u8 *object, char *reason)
+{
+	u8 *addr = page_address(page);
+
+	printk(KERN_ERR "*** SLUB %s: %s@0x%p slab 0x%p\n",
+			s->name, reason, object, page);
+	printk(KERN_ERR "    offset=%tu flags=0x%04lx inuse=%u freelist=0x%p\n",
+		object - addr, page->flags, page->inuse, page->freelist);
+	if (object > addr + 16)
+		print_section("Bytes b4", object - 16, 16);
+	print_section("Object", object, min(s->objsize, 128));
+	print_trailer(s, object);
+	dump_stack();
+}
+
+static void slab_err(struct kmem_cache *s, struct page *page, char *reason, ...)
+{
+	va_list args;
+	char buf[100];
+
+	va_start(args, reason);
+	vsnprintf(buf, sizeof(buf), reason, args);
+	va_end(args);
+	printk(KERN_ERR "*** SLUB %s: %s in slab @0x%p\n", s->name, buf,
+		page);
+	dump_stack();
+}
+
+static void init_object(struct kmem_cache *s, void *object, int active)
+{
+	u8 *p = object;
+
+	if (s->flags & __OBJECT_POISON) {
+		memset(p, POISON_FREE, s->objsize - 1);
+		p[s->objsize -1] = POISON_END;
+	}
+
+	if (s->flags & SLAB_RED_ZONE)
+		memset(p + s->objsize,
+			active ? SLUB_RED_ACTIVE : SLUB_RED_INACTIVE,
+			s->inuse - s->objsize);
+}
+
+static int check_bytes(u8 *start, unsigned int value, unsigned int bytes)
+{
+	while (bytes) {
+		if (*start != (u8)value)
+			return 0;
+		start++;
+		bytes--;
+	}
+	return 1;
+}
+
+
+static int check_valid_pointer(struct kmem_cache *s, struct page *page,
+					 void *object)
+{
+	void *base;
+
+	if (!object)
+		return 1;
+
+	base = page_address(page);
+	if (object < base || object >= base + s->objects * s->size ||
+		(object - base) % s->size) {
+		return 0;
+	}
+
+	return 1;
+}
+
+/*
+ * Object layout:
+ *
+ * object address
+ * 	Bytes of the object to be managed.
+ * 	If the freepointer may overlay the object then the free
+ * 	pointer is the first word of the object.
+ * 	Poisoning uses 0x6b (POISON_FREE) and the last byte is
+ * 	0xa5 (POISON_END)
+ *
+ * object + s->objsize
+ * 	Padding to reach word boundary. This is also used for Redzoning.
+ * 	Padding is extended to word size if Redzoning is enabled
+ * 	and objsize == inuse.
+ * 	We fill with 0xbb (RED_INACTIVE) for inactive objects and with
+ * 	0xcc (RED_ACTIVE) for objects in use.
+ *
+ * object + s->inuse
+ * 	A. Free pointer (if we cannot overwrite object on free)
+ * 	B. Tracking data for SLAB_STORE_USER
+ * 	C. Padding to reach required alignment boundary
+ * 		Padding is done using 0x5a (POISON_INUSE)
+ *
+ * object + s->size
+ *
+ * If slabcaches are merged then the objsize and inuse boundaries are to
+ * be ignored. And therefore no slab options that rely on these boundaries
+ * may be used with merged slabcaches.
+ */
+
+static void restore_bytes(struct kmem_cache *s, char *message, u8 data,
+						void *from, void *to)
+{
+	printk(KERN_ERR "@@@ SLUB %s: Restoring %s (0x%x) from 0x%p-0x%p\n",
+		s->name, message, data, from, to - 1);
+	memset(from, data, to - from);
+}
+
+static int check_pad_bytes(struct kmem_cache *s, struct page *page, u8 *p)
+{
+	unsigned long off = s->inuse;	/* The end of info */
+
+	if (s->offset)
+		/* Freepointer is placed after the object. */
+		off += sizeof(void *);
+
+	if (s->flags & SLAB_STORE_USER)
+		/* We also have user information there */
+		off += 2 * sizeof(struct track);
+
+	if (s->size == off)
+		return 1;
+
+	if (check_bytes(p + off, POISON_INUSE, s->size - off))
+		return 1;
+
+	object_err(s, page, p, "Object padding check fails");
+
+	/*
+	 * Restore padding
+	 */
+	restore_bytes(s, "object padding", POISON_INUSE, p + off, p + s->size);
+	return 0;
+}
+
+static int slab_pad_check(struct kmem_cache *s, struct page *page)
+{
+	u8 *p;
+	int length, remainder;
+
+	if (!(s->flags & SLAB_POISON))
+		return 1;
+
+	p = page_address(page);
+	length = s->objects * s->size;
+	remainder = (PAGE_SIZE << s->order) - length;
+	if (!remainder)
+		return 1;
+
+	if (!check_bytes(p + length, POISON_INUSE, remainder)) {
+		slab_err(s, page, "Padding check failed");
+		restore_bytes(s, "slab padding", POISON_INUSE, p + length,
+			p + length + remainder);
+		return 0;
+	}
+	return 1;
+}
+
+static int check_object(struct kmem_cache *s, struct page *page,
+					void *object, int active)
+{
+	u8 *p = object;
+	u8 *endobject = object + s->objsize;
+
+	if (s->flags & SLAB_RED_ZONE) {
+		unsigned int red =
+			active ? SLUB_RED_ACTIVE : SLUB_RED_INACTIVE;
+
+		if (!check_bytes(endobject, red, s->inuse - s->objsize)) {
+			object_err(s, page, object,
+			active ? "Redzone Active" : "Redzone Inactive");
+			restore_bytes(s, "redzone", red,
+				endobject, object + s->inuse);
+			return 0;
+		}
+	} else {
+		if ((s->flags & SLAB_POISON) && s->objsize < s->inuse &&
+			!check_bytes(endobject, POISON_INUSE,
+					s->inuse - s->objsize)) {
+		object_err(s, page, p, "Alignment padding check fails");
+		/*
+		 * Fix it so that there will not be another report.
+		 *
+		 * Hmmm... We may be corrupting an object that now expects
+		 * to be longer than allowed.
+		 */
+		restore_bytes(s, "alignment padding", POISON_INUSE,
+			endobject, object + s->inuse);
+		}
+	}
+
+	if (s->flags & SLAB_POISON) {
+		if (!active && (s->flags & __OBJECT_POISON) &&
+			(!check_bytes(p, POISON_FREE, s->objsize - 1) ||
+				p[s->objsize - 1] != POISON_END)) {
+
+			object_err(s, page, p, "Poison check failed");
+			restore_bytes(s, "Poison", POISON_FREE,
+						p, p + s->objsize -1);
+			restore_bytes(s, "Poison", POISON_END,
+					p + s->objsize - 1, p + s->objsize);
+			return 0;
+		}
+		/*
+		 * check_pad_bytes cleans up on its own.
+		 */
+		check_pad_bytes(s, page, p);
+	}
+
+	if (!s->offset && active)
+		/*
+		 * Object and freepointer overlap. Cannot check
+		 * freepointer while object is allocated.
+		 */
+		return 1;
+
+	/* Check free pointer validity */
+	if (!check_valid_pointer(s, page, get_freepointer(s, p))) {
+		object_err(s, page, p, "Freepointer corrupt");
+		/*
+		 * No choice but to zap it and thus loose the remainder
+		 * of the free objects in this slab. May cause
+		 * another error because the object count maybe
+		 * wrong now.
+		 */
+		set_freepointer(s, p, NULL);
+		return 0;
+	}
+	return 1;
+}
+
+static int check_slab(struct kmem_cache *s, struct page *page)
+{
+	VM_BUG_ON(!irqs_disabled());
+
+	if (!PageSlab(page)) {
+		slab_err(s, page, "Not a valid slab page flags=%lx "
+			"mapping=0x%p count=%d", page->flags, page->mapping,
+			page_count(page));
+		return 0;
+	}
+	if (page->offset * sizeof(void *) != s->offset) {
+		slab_err(s, page, "Corrupted offset %lu flags=0x%lx "
+			"mapping=0x%p count=%d",
+			(unsigned long)(page->offset * sizeof(void *)),
+			page->flags,
+			page->mapping,
+			page_count(page));
+		return 0;
+	}
+	if (page->inuse > s->objects) {
+		slab_err(s, page, "inuse %u > max %u @0x%p flags=%lx "
+			"mapping=0x%p count=%d",
+			s->name, page->inuse, s->objects, page->flags,
+			page->mapping, page_count(page));
+		return 0;
+	}
+	/* Slab_pad_check fixes things up after itself */
+	slab_pad_check(s, page);
+	return 1;
+}
+
+/*
+ * Determine if a certain object on a page is on the freelist and
+ * therefore free. Must hold the slab lock for cpu slabs to
+ * guarantee that the chains are consistent.
+ */
+static int on_freelist(struct kmem_cache *s, struct page *page, void *search)
+{
+	int nr = 0;
+	void *fp = page->freelist;
+	void *object = NULL;
+
+	while (fp && nr <= s->objects) {
+		if (fp == search)
+			return 1;
+		if (!check_valid_pointer(s, page, fp)) {
+			if (object) {
+				object_err(s, page, object,
+					"Freechain corrupt");
+				set_freepointer(s, object, NULL);
+				break;
+			} else {
+				slab_err(s, page, "Freepointer 0x%p corrupt",
+									fp);
+				page->freelist = NULL;
+				page->inuse = s->objects;
+				printk(KERN_ERR "@@@ SLUB %s: Freelist "
+					"cleared. Slab 0x%p\n",
+					s->name, page);
+				return 0;
+			}
+			break;
+		}
+		object = fp;
+		fp = get_freepointer(s, object);
+		nr++;
+	}
+
+	if (page->inuse != s->objects - nr) {
+		slab_err(s, page, "Wrong object count. Counter is %d but "
+			"counted were %d", s, page, page->inuse,
+							s->objects - nr);
+		page->inuse = s->objects - nr;
+		printk(KERN_ERR "@@@ SLUB %s: Object count adjusted. "
+			"Slab @0x%p\n", s->name, page);
+	}
+	return search == NULL;
+}
+
+/*
+ * Tracking of fully allocated slabs for debugging
+ */
+static void add_full(struct kmem_cache_node *n, struct page *page)
+{
+	spin_lock(&n->list_lock);
+	list_add(&page->lru, &n->full);
+	spin_unlock(&n->list_lock);
+}
+
+static void remove_full(struct kmem_cache *s, struct page *page)
+{
+	struct kmem_cache_node *n;
+
+	if (!(s->flags & SLAB_STORE_USER))
+		return;
+
+	n = get_node(s, page_to_nid(page));
+
+	spin_lock(&n->list_lock);
+	list_del(&page->lru);
+	spin_unlock(&n->list_lock);
+}
+
+static int alloc_object_checks(struct kmem_cache *s, struct page *page,
+							void *object)
+{
+	if (!check_slab(s, page))
+		goto bad;
+
+	if (object && !on_freelist(s, page, object)) {
+		slab_err(s, page, "Object 0x%p already allocated", object);
+		goto bad;
+	}
+
+	if (!check_valid_pointer(s, page, object)) {
+		object_err(s, page, object, "Freelist Pointer check fails");
+		goto bad;
+	}
+
+	if (!object)
+		return 1;
+
+	if (!check_object(s, page, object, 0))
+		goto bad;
+
+	return 1;
+bad:
+	if (PageSlab(page)) {
+		/*
+		 * If this is a slab page then lets do the best we can
+		 * to avoid issues in the future. Marking all objects
+		 * as used avoids touching the remainder.
+		 */
+		printk(KERN_ERR "@@@ SLUB: %s slab 0x%p. Marking all objects used.\n",
+			s->name, page);
+		page->inuse = s->objects;
+		page->freelist = NULL;
+		/* Fix up fields that may be corrupted */
+		page->offset = s->offset / sizeof(void *);
+	}
+	return 0;
+}
+
+static int free_object_checks(struct kmem_cache *s, struct page *page,
+							void *object)
+{
+	if (!check_slab(s, page))
+		goto fail;
+
+	if (!check_valid_pointer(s, page, object)) {
+		slab_err(s, page, "Invalid object pointer 0x%p", object);
+		goto fail;
+	}
+
+	if (on_freelist(s, page, object)) {
+		slab_err(s, page, "Object 0x%p already free", object);
+		goto fail;
+	}
+
+	if (!check_object(s, page, object, 1))
+		return 0;
+
+	if (unlikely(s != page->slab)) {
+		if (!PageSlab(page))
+			slab_err(s, page, "Attempt to free object(0x%p) "
+				"outside of slab", object);
+		else
+		if (!page->slab) {
+			printk(KERN_ERR
+				"SLUB <none>: no slab for object 0x%p.\n",
+						object);
+			dump_stack();
+		}
+		else
+			slab_err(s, page, "object at 0x%p belongs "
+				"to slab %s", object, page->slab->name);
+		goto fail;
+	}
+	return 1;
+fail:
+	printk(KERN_ERR "@@@ SLUB: %s slab 0x%p object at 0x%p not freed.\n",
+		s->name, page, object);
+	return 0;
+}
+
+/*
+ * Slab allocation and freeing
+ */
+static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
+{
+	struct page * page;
+	int pages = 1 << s->order;
+
+	if (s->order)
+		flags |= __GFP_COMP;
+
+	if (s->flags & SLAB_CACHE_DMA)
+		flags |= SLUB_DMA;
+
+	if (node == -1)
+		page = alloc_pages(flags, s->order);
+	else
+		page = alloc_pages_node(node, flags, s->order);
+
+	if (!page)
+		return NULL;
+
+	mod_zone_page_state(page_zone(page),
+		(s->flags & SLAB_RECLAIM_ACCOUNT) ?
+		NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
+		pages);
+
+	return page;
+}
+
+static void setup_object(struct kmem_cache *s, struct page *page,
+				void *object)
+{
+	if (PageError(page)) {
+		init_object(s, object, 0);
+		init_tracking(s, object);
+	}
+
+	if (unlikely(s->ctor))
+		s->ctor(object, s, SLAB_CTOR_CONSTRUCTOR);
+}
+
+static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
+{
+	struct page *page;
+	struct kmem_cache_node *n;
+	void *start;
+	void *end;
+	void *last;
+	void *p;
+
+	BUG_ON(flags & ~(GFP_DMA | GFP_LEVEL_MASK));
+
+	if (flags & __GFP_WAIT)
+		local_irq_enable();
+
+	page = allocate_slab(s, flags & GFP_LEVEL_MASK, node);
+	if (!page)
+		goto out;
+
+	n = get_node(s, page_to_nid(page));
+	if (n)
+		atomic_long_inc(&n->nr_slabs);
+	page->offset = s->offset / sizeof(void *);
+	page->slab = s;
+	page->flags |= 1 << PG_slab;
+	if (s->flags & (SLAB_DEBUG_FREE | SLAB_RED_ZONE | SLAB_POISON |
+			SLAB_STORE_USER | SLAB_TRACE))
+		page->flags |= 1 << PG_error;
+
+	start = page_address(page);
+	end = start + s->objects * s->size;
+
+	if (unlikely(s->flags & SLAB_POISON))
+		memset(start, POISON_INUSE, PAGE_SIZE << s->order);
+
+	last = start;
+	for (p = start + s->size; p < end; p += s->size) {
+		setup_object(s, page, last);
+		set_freepointer(s, last, p);
+		last = p;
+	}
+	setup_object(s, page, last);
+	set_freepointer(s, last, NULL);
+
+	page->freelist = start;
+	page->inuse = 0;
+out:
+	if (flags & __GFP_WAIT)
+		local_irq_disable();
+	return page;
+}
+
+static void __free_slab(struct kmem_cache *s, struct page *page)
+{
+	int pages = 1 << s->order;
+
+	if (unlikely(PageError(page) || s->dtor)) {
+		void *start = page_address(page);
+		void *end = start + (pages << PAGE_SHIFT);
+		void *p;
+
+		slab_pad_check(s, page);
+		for (p = start; p <= end - s->size; p += s->size) {
+			if (s->dtor)
+				s->dtor(p, s, 0);
+			check_object(s, page, p, 0);
+		}
+	}
+
+	mod_zone_page_state(page_zone(page),
+		(s->flags & SLAB_RECLAIM_ACCOUNT) ?
+		NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
+		- pages);
+
+	page->mapping = NULL;
+	__free_pages(page, s->order);
+}
+
+static void rcu_free_slab(struct rcu_head *h)
+{
+	struct page *page;
+
+	page = container_of((struct list_head *)h, struct page, lru);
+	__free_slab(page->slab, page);
+}
+
+static void free_slab(struct kmem_cache *s, struct page *page)
+{
+	if (unlikely(s->flags & SLAB_DESTROY_BY_RCU)) {
+		/*
+		 * RCU free overloads the RCU head over the LRU
+		 */
+		struct rcu_head *head = (void *)&page->lru;
+
+		call_rcu(head, rcu_free_slab);
+	} else
+		__free_slab(s, page);
+}
+
+static void discard_slab(struct kmem_cache *s, struct page *page)
+{
+	struct kmem_cache_node *n = get_node(s, page_to_nid(page));
+
+	atomic_long_dec(&n->nr_slabs);
+	reset_page_mapcount(page);
+	page->flags &= ~(1 << PG_slab | 1 << PG_error);
+	free_slab(s, page);
+}
+
+/*
+ * Per slab locking using the pagelock
+ */
+static __always_inline void slab_lock(struct page *page)
+{
+	bit_spin_lock(PG_locked, &page->flags);
+}
+
+static __always_inline void slab_unlock(struct page *page)
+{
+	bit_spin_unlock(PG_locked, &page->flags);
+}
+
+static __always_inline int slab_trylock(struct page *page)
+{
+	int rc = 1;
+
+	rc = bit_spin_trylock(PG_locked, &page->flags);
+	return rc;
+}
+
+/*
+ * Management of partially allocated slabs
+ */
+static void add_partial_tail(struct kmem_cache_node *n, struct page *page)
+{
+	spin_lock(&n->list_lock);
+	n->nr_partial++;
+	list_add_tail(&page->lru, &n->partial);
+	spin_unlock(&n->list_lock);
+}
+
+static void add_partial(struct kmem_cache_node *n, struct page *page)
+{
+	spin_lock(&n->list_lock);
+	n->nr_partial++;
+	list_add(&page->lru, &n->partial);
+	spin_unlock(&n->list_lock);
+}
+
+static void remove_partial(struct kmem_cache *s,
+						struct page *page)
+{
+	struct kmem_cache_node *n = get_node(s, page_to_nid(page));
+
+	spin_lock(&n->list_lock);
+	list_del(&page->lru);
+	n->nr_partial--;
+	spin_unlock(&n->list_lock);
+}
+
+/*
+ * Lock page and remove it from the partial list
+ *
+ * Must hold list_lock
+ */
+static int lock_and_del_slab(struct kmem_cache_node *n, struct page *page)
+{
+	if (slab_trylock(page)) {
+		list_del(&page->lru);
+		n->nr_partial--;
+		return 1;
+	}
+	return 0;
+}
+
+/*
+ * Try to get a partial slab from a specific node
+ */
+static struct page *get_partial_node(struct kmem_cache_node *n)
+{
+	struct page *page;
+
+	/*
+	 * Racy check. If we mistakenly see no partial slabs then we
+	 * just allocate an empty slab. If we mistakenly try to get a
+	 * partial slab then get_partials() will return NULL.
+	 */
+	if (!n || !n->nr_partial)
+		return NULL;
+
+	spin_lock(&n->list_lock);
+	list_for_each_entry(page, &n->partial, lru)
+		if (lock_and_del_slab(n, page))
+			goto out;
+	page = NULL;
+out:
+	spin_unlock(&n->list_lock);
+	return page;
+}
+
+/*
+ * Get a page from somewhere. Search in increasing NUMA
+ * distances.
+ */
+static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags)
+{
+#ifdef CONFIG_NUMA
+	struct zonelist *zonelist;
+	struct zone **z;
+	struct page *page;
+
+	/*
+	 * The defrag ratio allows to configure the tradeoffs between
+	 * inter node defragmentation and node local allocations.
+	 * A lower defrag_ratio increases the tendency to do local
+	 * allocations instead of scanning throught the partial
+	 * lists on other nodes.
+	 *
+	 * If defrag_ratio is set to 0 then kmalloc() always
+	 * returns node local objects. If its higher then kmalloc()
+	 * may return off node objects in order to avoid fragmentation.
+	 *
+	 * A higher ratio means slabs may be taken from other nodes
+	 * thus reducing the number of partial slabs on those nodes.
+	 *
+	 * If /sys/slab/xx/defrag_ratio is set to 100 (which makes
+	 * defrag_ratio = 1000) then every (well almost) allocation
+	 * will first attempt to defrag slab caches on other nodes. This
+	 * means scanning over all nodes to look for partial slabs which
+	 * may be a bit expensive to do on every slab allocation.
+	 */
+	if (!s->defrag_ratio || get_cycles() % 1024 > s->defrag_ratio)
+		return NULL;
+
+	zonelist = &NODE_DATA(slab_node(current->mempolicy))
+					->node_zonelists[gfp_zone(flags)];
+	for (z = zonelist->zones; *z; z++) {
+		struct kmem_cache_node *n;
+
+		n = get_node(s, zone_to_nid(*z));
+
+		if (n && cpuset_zone_allowed_hardwall(*z, flags) &&
+				n->nr_partial > MIN_PARTIAL) {
+			page = get_partial_node(n);
+			if (page)
+				return page;
+		}
+	}
+#endif
+	return NULL;
+}
+
+/*
+ * Get a partial page, lock it and return it.
+ */
+static struct page *get_partial(struct kmem_cache *s, gfp_t flags, int node)
+{
+	struct page *page;
+	int searchnode = (node == -1) ? numa_node_id() : node;
+
+	page = get_partial_node(get_node(s, searchnode));
+	if (page || (flags & __GFP_THISNODE))
+		return page;
+
+	return get_any_partial(s, flags);
+}
+
+/*
+ * Move a page back to the lists.
+ *
+ * Must be called with the slab lock held.
+ *
+ * On exit the slab lock will have been dropped.
+ */
+static void putback_slab(struct kmem_cache *s, struct page *page)
+{
+	struct kmem_cache_node *n = get_node(s, page_to_nid(page));
+
+	if (page->inuse) {
+
+		if (page->freelist)
+			add_partial(n, page);
+		else if (PageError(page) && (s->flags & SLAB_STORE_USER))
+			add_full(n, page);
+		slab_unlock(page);
+
+	} else {
+		if (n->nr_partial < MIN_PARTIAL) {
+			/*
+			 * Adding an empty page to the partial slabs in order
+			 * to avoid page allocator overhead. This page needs to
+			 * come after all the others that are not fully empty
+			 * in order to make sure that we do maximum
+			 * defragmentation.
+			 */
+			add_partial_tail(n, page);
+			slab_unlock(page);
+		} else {
+			slab_unlock(page);
+			discard_slab(s, page);
+		}
+	}
+}
+
+/*
+ * Remove the cpu slab
+ */
+static void deactivate_slab(struct kmem_cache *s, struct page *page, int cpu)
+{
+	s->cpu_slab[cpu] = NULL;
+	ClearPageActive(page);
+
+	putback_slab(s, page);
+}
+
+static void flush_slab(struct kmem_cache *s, struct page *page, int cpu)
+{
+	slab_lock(page);
+	deactivate_slab(s, page, cpu);
+}
+
+/*
+ * Flush cpu slab.
+ * Called from IPI handler with interrupts disabled.
+ */
+static void __flush_cpu_slab(struct kmem_cache *s, int cpu)
+{
+	struct page *page = s->cpu_slab[cpu];
+
+	if (likely(page))
+		flush_slab(s, page, cpu);
+}
+
+static void flush_cpu_slab(void *d)
+{
+	struct kmem_cache *s = d;
+	int cpu = smp_processor_id();
+
+	__flush_cpu_slab(s, cpu);
+}
+
+static void flush_all(struct kmem_cache *s)
+{
+#ifdef CONFIG_SMP
+	on_each_cpu(flush_cpu_slab, s, 1, 1);
+#else
+	unsigned long flags;
+
+	local_irq_save(flags);
+	flush_cpu_slab(s);
+	local_irq_restore(flags);
+#endif
+}
+
+/*
+ * slab_alloc is optimized to only modify two cachelines on the fast path
+ * (aside from the stack):
+ *
+ * 1. The page struct
+ * 2. The first cacheline of the object to be allocated.
+ *
+ * The only cache lines that are read (apart from code) is the
+ * per cpu array in the kmem_cache struct.
+ *
+ * Fastpath is not possible if we need to get a new slab or have
+ * debugging enabled (which means all slabs are marked with PageError)
+ */
+static void *slab_alloc(struct kmem_cache *s,
+				gfp_t gfpflags, int node, void *addr)
+{
+	struct page *page;
+	void **object;
+	unsigned long flags;
+	int cpu;
+
+	local_irq_save(flags);
+	cpu = smp_processor_id();
+	page = s->cpu_slab[cpu];
+	if (!page)
+		goto new_slab;
+
+	slab_lock(page);
+	if (unlikely(node != -1 && page_to_nid(page) != node))
+		goto another_slab;
+redo:
+	object = page->freelist;
+	if (unlikely(!object))
+		goto another_slab;
+	if (unlikely(PageError(page)))
+		goto debug;
+
+have_object:
+	page->inuse++;
+	page->freelist = object[page->offset];
+	slab_unlock(page);
+	local_irq_restore(flags);
+	return object;
+
+another_slab:
+	deactivate_slab(s, page, cpu);
+
+new_slab:
+	page = get_partial(s, gfpflags, node);
+	if (likely(page)) {
+have_slab:
+		s->cpu_slab[cpu] = page;
+		SetPageActive(page);
+		goto redo;
+	}
+
+	page = new_slab(s, gfpflags, node);
+	if (page) {
+		cpu = smp_processor_id();
+		if (s->cpu_slab[cpu]) {
+			/*
+			 * Someone else populated the cpu_slab while we enabled
+			 * interrupts, or we have got scheduled on another cpu.
+			 * The page may not be on the requested node.
+			 */
+			if (node == -1 ||
+				page_to_nid(s->cpu_slab[cpu]) == node) {
+				/*
+				 * Current cpuslab is acceptable and we
+				 * want the current one since its cache hot
+				 */
+				discard_slab(s, page);
+				page = s->cpu_slab[cpu];
+				slab_lock(page);
+				goto redo;
+			}
+			/* Dump the current slab */
+			flush_slab(s, s->cpu_slab[cpu], cpu);
+		}
+		slab_lock(page);
+		goto have_slab;
+	}
+	local_irq_restore(flags);
+	return NULL;
+debug:
+	if (!alloc_object_checks(s, page, object))
+		goto another_slab;
+	if (s->flags & SLAB_STORE_USER)
+		set_track(s, object, TRACK_ALLOC, addr);
+	if (s->flags & SLAB_TRACE) {
+		printk(KERN_INFO "TRACE %s alloc 0x%p inuse=%d fp=0x%p\n",
+			s->name, object, page->inuse,
+			page->freelist);
+		dump_stack();
+	}
+	init_object(s, object, 1);
+	goto have_object;
+}
+
+void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags)
+{
+	return slab_alloc(s, gfpflags, -1, __builtin_return_address(0));
+}
+EXPORT_SYMBOL(kmem_cache_alloc);
+
+#ifdef CONFIG_NUMA
+void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node)
+{
+	return slab_alloc(s, gfpflags, node, __builtin_return_address(0));
+}
+EXPORT_SYMBOL(kmem_cache_alloc_node);
+#endif
+
+/*
+ * The fastpath only writes the cacheline of the page struct and the first
+ * cacheline of the object.
+ *
+ * No special cachelines need to be read
+ */
+static void slab_free(struct kmem_cache *s, struct page *page,
+					void *x, void *addr)
+{
+	void *prior;
+	void **object = (void *)x;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	slab_lock(page);
+
+	if (unlikely(PageError(page)))
+		goto debug;
+checks_ok:
+	prior = object[page->offset] = page->freelist;
+	page->freelist = object;
+	page->inuse--;
+
+	if (unlikely(PageActive(page)))
+		/*
+		 * Cpu slabs are never on partial lists and are
+		 * never freed.
+		 */
+		goto out_unlock;
+
+	if (unlikely(!page->inuse))
+		goto slab_empty;
+
+	/*
+	 * Objects left in the slab. If it
+	 * was not on the partial list before
+	 * then add it.
+	 */
+	if (unlikely(!prior))
+		add_partial(get_node(s, page_to_nid(page)), page);
+
+out_unlock:
+	slab_unlock(page);
+	local_irq_restore(flags);
+	return;
+
+slab_empty:
+	if (prior)
+		/*
+		 * Slab on the partial list.
+		 */
+		remove_partial(s, page);
+
+	slab_unlock(page);
+	discard_slab(s, page);
+	local_irq_restore(flags);
+	return;
+
+debug:
+	if (!free_object_checks(s, page, x))
+		goto out_unlock;
+	if (!PageActive(page) && !page->freelist)
+		remove_full(s, page);
+	if (s->flags & SLAB_STORE_USER)
+		set_track(s, x, TRACK_FREE, addr);
+	if (s->flags & SLAB_TRACE) {
+		printk(KERN_INFO "TRACE %s free 0x%p inuse=%d fp=0x%p\n",
+			s->name, object, page->inuse,
+			page->freelist);
+		print_section("Object", (void *)object, s->objsize);
+		dump_stack();
+	}
+	init_object(s, object, 0);
+	goto checks_ok;
+}
+
+void kmem_cache_free(struct kmem_cache *s, void *x)
+{
+	struct page *page;
+
+	page = virt_to_head_page(x);
+
+	slab_free(s, page, x, __builtin_return_address(0));
+}
+EXPORT_SYMBOL(kmem_cache_free);
+
+/* Figure out on which slab object the object resides */
+static struct page *get_object_page(const void *x)
+{
+	struct page *page = virt_to_head_page(x);
+
+	if (!PageSlab(page))
+		return NULL;
+
+	return page;
+}
+
+/*
+ * kmem_cache_open produces objects aligned at "size" and the first object
+ * is placed at offset 0 in the slab (We have no metainformation on the
+ * slab, all slabs are in essence "off slab").
+ *
+ * In order to get the desired alignment one just needs to align the
+ * size.
+ *
+ * Notice that the allocation order determines the sizes of the per cpu
+ * caches. Each processor has always one slab available for allocations.
+ * Increasing the allocation order reduces the number of times that slabs
+ * must be moved on and off the partial lists and therefore may influence
+ * locking overhead.
+ *
+ * The offset is used to relocate the free list link in each object. It is
+ * therefore possible to move the free list link behind the object. This
+ * is necessary for RCU to work properly and also useful for debugging.
+ */
+
+/*
+ * Mininum / Maximum order of slab pages. This influences locking overhead
+ * and slab fragmentation. A higher order reduces the number of partial slabs
+ * and increases the number of allocations possible without having to
+ * take the list_lock.
+ */
+static int slub_min_order;
+static int slub_max_order = DEFAULT_MAX_ORDER;
+
+/*
+ * Minimum number of objects per slab. This is necessary in order to
+ * reduce locking overhead. Similar to the queue size in SLAB.
+ */
+static int slub_min_objects = DEFAULT_MIN_OBJECTS;
+
+/*
+ * Merge control. If this is set then no merging of slab caches will occur.
+ */
+static int slub_nomerge;
+
+/*
+ * Debug settings:
+ */
+static int slub_debug;
+
+static char *slub_debug_slabs;
+
+/*
+ * Calculate the order of allocation given an slab object size.
+ *
+ * The order of allocation has significant impact on other elements
+ * of the system. Generally order 0 allocations should be preferred
+ * since they do not cause fragmentation in the page allocator. Larger
+ * objects may have problems with order 0 because there may be too much
+ * space left unused in a slab. We go to a higher order if more than 1/8th
+ * of the slab would be wasted.
+ *
+ * In order to reach satisfactory performance we must ensure that
+ * a minimum number of objects is in one slab. Otherwise we may
+ * generate too much activity on the partial lists. This is less a
+ * concern for large slabs though. slub_max_order specifies the order
+ * where we begin to stop considering the number of objects in a slab.
+ *
+ * Higher order allocations also allow the placement of more objects
+ * in a slab and thereby reduce object handling overhead. If the user
+ * has requested a higher mininum order then we start with that one
+ * instead of zero.
+ */
+static int calculate_order(int size)
+{
+	int order;
+	int rem;
+
+	for (order = max(slub_min_order, fls(size - 1) - PAGE_SHIFT);
+			order < MAX_ORDER; order++) {
+		unsigned long slab_size = PAGE_SIZE << order;
+
+		if (slub_max_order > order &&
+				slab_size < slub_min_objects * size)
+			continue;
+
+		if (slab_size < size)
+			continue;
+
+		rem = slab_size % size;
+
+		if (rem <= (PAGE_SIZE << order) / 8)
+			break;
+
+	}
+	if (order >= MAX_ORDER)
+		return -E2BIG;
+	return order;
+}
+
+/*
+ * Function to figure out which alignment to use from the
+ * various ways of specifying it.
+ */
+static unsigned long calculate_alignment(unsigned long flags,
+		unsigned long align, unsigned long size)
+{
+	/*
+	 * If the user wants hardware cache aligned objects then
+	 * follow that suggestion if the object is sufficiently
+	 * large.
+	 *
+	 * The hardware cache alignment cannot override the
+	 * specified alignment though. If that is greater
+	 * then use it.
+	 */
+	if ((flags & SLAB_HWCACHE_ALIGN) &&
+			size > L1_CACHE_BYTES / 2)
+		return max_t(unsigned long, align, L1_CACHE_BYTES);
+
+	if (align < ARCH_SLAB_MINALIGN)
+		return ARCH_SLAB_MINALIGN;
+
+	return ALIGN(align, sizeof(void *));
+}
+
+static void init_kmem_cache_node(struct kmem_cache_node *n)
+{
+	n->nr_partial = 0;
+	atomic_long_set(&n->nr_slabs, 0);
+	spin_lock_init(&n->list_lock);
+	INIT_LIST_HEAD(&n->partial);
+	INIT_LIST_HEAD(&n->full);
+}
+
+#ifdef CONFIG_NUMA
+/*
+ * No kmalloc_node yet so do it by hand. We know that this is the first
+ * slab on the node for this slabcache. There are no concurrent accesses
+ * possible.
+ *
+ * Note that this function only works on the kmalloc_node_cache
+ * when allocating for the kmalloc_node_cache.
+ */
+static struct kmem_cache_node * __init early_kmem_cache_node_alloc(gfp_t gfpflags,
+								int node)
+{
+	struct page *page;
+	struct kmem_cache_node *n;
+
+	BUG_ON(kmalloc_caches->size < sizeof(struct kmem_cache_node));
+
+	page = new_slab(kmalloc_caches, gfpflags | GFP_THISNODE, node);
+	/* new_slab() disables interupts */
+	local_irq_enable();
+
+	BUG_ON(!page);
+	n = page->freelist;
+	BUG_ON(!n);
+	page->freelist = get_freepointer(kmalloc_caches, n);
+	page->inuse++;
+	kmalloc_caches->node[node] = n;
+	init_object(kmalloc_caches, n, 1);
+	init_kmem_cache_node(n);
+	atomic_long_inc(&n->nr_slabs);
+	add_partial(n, page);
+	return n;
+}
+
+static void free_kmem_cache_nodes(struct kmem_cache *s)
+{
+	int node;
+
+	for_each_online_node(node) {
+		struct kmem_cache_node *n = s->node[node];
+		if (n && n != &s->local_node)
+			kmem_cache_free(kmalloc_caches, n);
+		s->node[node] = NULL;
+	}
+}
+
+static int init_kmem_cache_nodes(struct kmem_cache *s, gfp_t gfpflags)
+{
+	int node;
+	int local_node;
+
+	if (slab_state >= UP)
+		local_node = page_to_nid(virt_to_page(s));
+	else
+		local_node = 0;
+
+	for_each_online_node(node) {
+		struct kmem_cache_node *n;
+
+		if (local_node == node)
+			n = &s->local_node;
+		else {
+			if (slab_state == DOWN) {
+				n = early_kmem_cache_node_alloc(gfpflags,
+								node);
+				continue;
+			}
+			n = kmem_cache_alloc_node(kmalloc_caches,
+							gfpflags, node);
+
+			if (!n) {
+				free_kmem_cache_nodes(s);
+				return 0;
+			}
+
+		}
+		s->node[node] = n;
+		init_kmem_cache_node(n);
+	}
+	return 1;
+}
+#else
+static void free_kmem_cache_nodes(struct kmem_cache *s)
+{
+}
+
+static int init_kmem_cache_nodes(struct kmem_cache *s, gfp_t gfpflags)
+{
+	init_kmem_cache_node(&s->local_node);
+	return 1;
+}
+#endif
+
+/*
+ * calculate_sizes() determines the order and the distribution of data within
+ * a slab object.
+ */
+static int calculate_sizes(struct kmem_cache *s)
+{
+	unsigned long flags = s->flags;
+	unsigned long size = s->objsize;
+	unsigned long align = s->align;
+
+	/*
+	 * Determine if we can poison the object itself. If the user of
+	 * the slab may touch the object after free or before allocation
+	 * then we should never poison the object itself.
+	 */
+	if ((flags & SLAB_POISON) && !(flags & SLAB_DESTROY_BY_RCU) &&
+			!s->ctor && !s->dtor)
+		s->flags |= __OBJECT_POISON;
+	else
+		s->flags &= ~__OBJECT_POISON;
+
+	/*
+	 * Round up object size to the next word boundary. We can only
+	 * place the free pointer at word boundaries and this determines
+	 * the possible location of the free pointer.
+	 */
+	size = ALIGN(size, sizeof(void *));
+
+	/*
+	 * If we are redzoning then check if there is some space between the
+	 * end of the object and the free pointer. If not then add an
+	 * additional word, so that we can establish a redzone between
+	 * the object and the freepointer to be able to check for overwrites.
+	 */
+	if ((flags & SLAB_RED_ZONE) && size == s->objsize)
+		size += sizeof(void *);
+
+	/*
+	 * With that we have determined how much of the slab is in actual
+	 * use by the object. This is the potential offset to the free
+	 * pointer.
+	 */
+	s->inuse = size;
+
+	if (((flags & (SLAB_DESTROY_BY_RCU | SLAB_POISON)) ||
+		s->ctor || s->dtor)) {
+		/*
+		 * Relocate free pointer after the object if it is not
+		 * permitted to overwrite the first word of the object on
+		 * kmem_cache_free.
+		 *
+		 * This is the case if we do RCU, have a constructor or
+		 * destructor or are poisoning the objects.
+		 */
+		s->offset = size;
+		size += sizeof(void *);
+	}
+
+	if (flags & SLAB_STORE_USER)
+		/*
+		 * Need to store information about allocs and frees after
+		 * the object.
+		 */
+		size += 2 * sizeof(struct track);
+
+	if (flags & DEBUG_DEFAULT_FLAGS)
+		/*
+		 * Add some empty padding so that we can catch
+		 * overwrites from earlier objects rather than let
+		 * tracking information or the free pointer be
+		 * corrupted if an user writes before the start
+		 * of the object.
+		 */
+		size += sizeof(void *);
+	/*
+	 * Determine the alignment based on various parameters that the
+	 * user specified (this is unecessarily complex due to the attempt
+	 * to be compatible with SLAB. Should be cleaned up some day).
+	 */
+	align = calculate_alignment(flags, align, s->objsize);
+
+	/*
+	 * SLUB stores one object immediately after another beginning from
+	 * offset 0. In order to align the objects we have to simply size
+	 * each object to conform to the alignment.
+	 */
+	size = ALIGN(size, align);
+	s->size = size;
+
+	s->order = calculate_order(size);
+	if (s->order < 0)
+		return 0;
+
+	/*
+	 * Determine the number of objects per slab
+	 */
+	s->objects = (PAGE_SIZE << s->order) / size;
+
+	/*
+	 * Verify that the number of objects is within permitted limits.
+	 * The page->inuse field is only 16 bit wide! So we cannot have
+	 * more than 64k objects per slab.
+	 */
+	if (!s->objects || s->objects > 65535)
+		return 0;
+	return 1;
+
+}
+
+static int __init finish_bootstrap(void)
+{
+	struct list_head *h;
+	int err;
+
+	slab_state = SYSFS;
+
+	list_for_each(h, &slab_caches) {
+		struct kmem_cache *s =
+			container_of(h, struct kmem_cache, list);
+
+		err = sysfs_slab_add(s);
+		BUG_ON(err);
+	}
+	return 0;
+}
+
+static int kmem_cache_open(struct kmem_cache *s, gfp_t gfpflags,
+		const char *name, size_t size,
+		size_t align, unsigned long flags,
+		void (*ctor)(void *, struct kmem_cache *, unsigned long),
+		void (*dtor)(void *, struct kmem_cache *, unsigned long))
+{
+	memset(s, 0, kmem_size);
+	s->name = name;
+	s->ctor = ctor;
+	s->dtor = dtor;
+	s->objsize = size;
+	s->flags = flags;
+	s->align = align;
+
+	/*
+	 * The page->offset field is only 16 bit wide. This is an offset
+	 * in units of words from the beginning of an object. If the slab
+	 * size is bigger then we cannot move the free pointer behind the
+	 * object anymore.
+	 *
+	 * On 32 bit platforms the limit is 256k. On 64bit platforms
+	 * the limit is 512k.
+	 *
+	 * Debugging or ctor/dtors may create a need to move the free
+	 * pointer. Fail if this happens.
+	 */
+	if (s->size >= 65535 * sizeof(void *)) {
+		BUG_ON(flags & (SLAB_RED_ZONE | SLAB_POISON |
+				SLAB_STORE_USER | SLAB_DESTROY_BY_RCU));
+		BUG_ON(ctor || dtor);
+	}
+	else
+		/*
+		 * Enable debugging if selected on the kernel commandline.
+		 */
+		if (slub_debug && (!slub_debug_slabs ||
+		    strncmp(slub_debug_slabs, name,
+		    	strlen(slub_debug_slabs)) == 0))
+				s->flags |= slub_debug;
+
+	if (!calculate_sizes(s))
+		goto error;
+
+	s->refcount = 1;
+#ifdef CONFIG_NUMA
+	s->defrag_ratio = 100;
+#endif
+
+	if (init_kmem_cache_nodes(s, gfpflags & ~SLUB_DMA))
+		return 1;
+error:
+	if (flags & SLAB_PANIC)
+		panic("Cannot create slab %s size=%lu realsize=%u "
+			"order=%u offset=%u flags=%lx\n",
+			s->name, (unsigned long)size, s->size, s->order,
+			s->offset, flags);
+	return 0;
+}
+EXPORT_SYMBOL(kmem_cache_open);
+
+/*
+ * Check if a given pointer is valid
+ */
+int kmem_ptr_validate(struct kmem_cache *s, const void *object)
+{
+	struct page * page;
+	void *addr;
+
+	page = get_object_page(object);
+
+	if (!page || s != page->slab)
+		/* No slab or wrong slab */
+		return 0;
+
+	addr = page_address(page);
+	if (object < addr || object >= addr + s->objects * s->size)
+		/* Out of bounds */
+		return 0;
+
+	if ((object - addr) % s->size)
+		/* Improperly aligned */
+		return 0;
+
+	/*
+	 * We could also check if the object is on the slabs freelist.
+	 * But this would be too expensive and it seems that the main
+	 * purpose of kmem_ptr_valid is to check if the object belongs
+	 * to a certain slab.
+	 */
+	return 1;
+}
+EXPORT_SYMBOL(kmem_ptr_validate);
+
+/*
+ * Determine the size of a slab object
+ */
+unsigned int kmem_cache_size(struct kmem_cache *s)
+{
+	return s->objsize;
+}
+EXPORT_SYMBOL(kmem_cache_size);
+
+const char *kmem_cache_name(struct kmem_cache *s)
+{
+	return s->name;
+}
+EXPORT_SYMBOL(kmem_cache_name);
+
+/*
+ * Attempt to free all slabs on a node
+ */
+static int free_list(struct kmem_cache *s, struct kmem_cache_node *n,
+			struct list_head *list)
+{
+	int slabs_inuse = 0;
+	unsigned long flags;
+	struct page *page, *h;
+
+	spin_lock_irqsave(&n->list_lock, flags);
+	list_for_each_entry_safe(page, h, list, lru)
+		if (!page->inuse) {
+			list_del(&page->lru);
+			discard_slab(s, page);
+		} else
+			slabs_inuse++;
+	spin_unlock_irqrestore(&n->list_lock, flags);
+	return slabs_inuse;
+}
+
+/*
+ * Release all resources used by slab cache
+ */
+static int kmem_cache_close(struct kmem_cache *s)
+{
+	int node;
+
+	flush_all(s);
+
+	/* Attempt to free all objects */
+	for_each_online_node(node) {
+		struct kmem_cache_node *n = get_node(s, node);
+
+		n->nr_partial -= free_list(s, n, &n->partial);
+		if (atomic_long_read(&n->nr_slabs))
+			return 1;
+	}
+	free_kmem_cache_nodes(s);
+	return 0;
+}
+
+/*
+ * Close a cache and release the kmem_cache structure
+ * (must be used for caches created using kmem_cache_create)
+ */
+void kmem_cache_destroy(struct kmem_cache *s)
+{
+	down_write(&slub_lock);
+	s->refcount--;
+	if (!s->refcount) {
+		list_del(&s->list);
+		if (kmem_cache_close(s))
+			WARN_ON(1);
+		sysfs_slab_remove(s);
+		kfree(s);
+	}
+	up_write(&slub_lock);
+}
+EXPORT_SYMBOL(kmem_cache_destroy);
+
+/********************************************************************
+ *		Kmalloc subsystem
+ *******************************************************************/
+
+struct kmem_cache kmalloc_caches[KMALLOC_SHIFT_HIGH + 1] __cacheline_aligned;
+EXPORT_SYMBOL(kmalloc_caches);
+
+#ifdef CONFIG_ZONE_DMA
+static struct kmem_cache *kmalloc_caches_dma[KMALLOC_SHIFT_HIGH + 1];
+#endif
+
+static int __init setup_slub_min_order(char *str)
+{
+	get_option (&str, &slub_min_order);
+
+	return 1;
+}
+
+__setup("slub_min_order=", setup_slub_min_order);
+
+static int __init setup_slub_max_order(char *str)
+{
+	get_option (&str, &slub_max_order);
+
+	return 1;
+}
+
+__setup("slub_max_order=", setup_slub_max_order);
+
+static int __init setup_slub_min_objects(char *str)
+{
+	get_option (&str, &slub_min_objects);
+
+	return 1;
+}
+
+__setup("slub_min_objects=", setup_slub_min_objects);
+
+static int __init setup_slub_nomerge(char *str)
+{
+	slub_nomerge = 1;
+	return 1;
+}
+
+__setup("slub_nomerge", setup_slub_nomerge);
+
+static int __init setup_slub_debug(char *str)
+{
+	if (!str || *str != '=')
+		slub_debug = DEBUG_DEFAULT_FLAGS;
+	else {
+		str++;
+		if (*str == 0 || *str == ',')
+			slub_debug = DEBUG_DEFAULT_FLAGS;
+		else
+		for( ;*str && *str != ','; str++)
+			switch (*str) {
+			case 'f' : case 'F' :
+				slub_debug |= SLAB_DEBUG_FREE;
+				break;
+			case 'z' : case 'Z' :
+				slub_debug |= SLAB_RED_ZONE;
+				break;
+			case 'p' : case 'P' :
+				slub_debug |= SLAB_POISON;
+				break;
+			case 'u' : case 'U' :
+				slub_debug |= SLAB_STORE_USER;
+				break;
+			case 't' : case 'T' :
+				slub_debug |= SLAB_TRACE;
+				break;
+			default:
+				printk(KERN_ERR "slub_debug option '%c' "
+					"unknown. skipped\n",*str);
+			}
+	}
+
+	if (*str == ',')
+		slub_debug_slabs = str + 1;
+	return 1;
+}
+
+__setup("slub_debug", setup_slub_debug);
+
+static struct kmem_cache *create_kmalloc_cache(struct kmem_cache *s,
+		const char *name, int size, gfp_t gfp_flags)
+{
+	unsigned int flags = 0;
+
+	if (gfp_flags & SLUB_DMA)
+		flags = SLAB_CACHE_DMA;
+
+	down_write(&slub_lock);
+	if (!kmem_cache_open(s, gfp_flags, name, size, ARCH_KMALLOC_MINALIGN,
+			flags, NULL, NULL))
+		goto panic;
+
+	list_add(&s->list, &slab_caches);
+	up_write(&slub_lock);
+	if (sysfs_slab_add(s))
+		goto panic;
+	return s;
+
+panic:
+	panic("Creation of kmalloc slab %s size=%d failed.\n", name, size);
+}
+
+static struct kmem_cache *get_slab(size_t size, gfp_t flags)
+{
+	int index = kmalloc_index(size);
+
+	if (!index)
+		return NULL;
+
+	/* Allocation too large? */
+	BUG_ON(index < 0);
+
+#ifdef CONFIG_ZONE_DMA
+	if ((flags & SLUB_DMA)) {
+		struct kmem_cache *s;
+		struct kmem_cache *x;
+		char *text;
+		size_t realsize;
+
+		s = kmalloc_caches_dma[index];
+		if (s)
+			return s;
+
+		/* Dynamically create dma cache */
+		x = kmalloc(kmem_size, flags & ~SLUB_DMA);
+		if (!x)
+			panic("Unable to allocate memory for dma cache\n");
+
+		if (index <= KMALLOC_SHIFT_HIGH)
+			realsize = 1 << index;
+		else {
+			if (index == 1)
+				realsize = 96;
+			else
+				realsize = 192;
+		}
+
+		text = kasprintf(flags & ~SLUB_DMA, "kmalloc_dma-%d",
+				(unsigned int)realsize);
+		s = create_kmalloc_cache(x, text, realsize, flags);
+		kmalloc_caches_dma[index] = s;
+		return s;
+	}
+#endif
+	return &kmalloc_caches[index];
+}
+
+void *__kmalloc(size_t size, gfp_t flags)
+{
+	struct kmem_cache *s = get_slab(size, flags);
+
+	if (s)
+		return slab_alloc(s, flags, -1, __builtin_return_address(0));
+	return NULL;
+}
+EXPORT_SYMBOL(__kmalloc);
+
+#ifdef CONFIG_NUMA
+void *__kmalloc_node(size_t size, gfp_t flags, int node)
+{
+	struct kmem_cache *s = get_slab(size, flags);
+
+	if (s)
+		return slab_alloc(s, flags, node, __builtin_return_address(0));
+	return NULL;
+}
+EXPORT_SYMBOL(__kmalloc_node);
+#endif
+
+size_t ksize(const void *object)
+{
+	struct page *page = get_object_page(object);
+	struct kmem_cache *s;
+
+	BUG_ON(!page);
+	s = page->slab;
+	BUG_ON(!s);
+
+	/*
+	 * Debugging requires use of the padding between object
+	 * and whatever may come after it.
+	 */
+	if (s->flags & (SLAB_RED_ZONE | SLAB_POISON))
+		return s->objsize;
+
+	/*
+	 * If we have the need to store the freelist pointer
+	 * back there or track user information then we can
+	 * only use the space before that information.
+	 */
+	if (s->flags & (SLAB_DESTROY_BY_RCU | SLAB_STORE_USER))
+		return s->inuse;
+
+	/*
+	 * Else we can use all the padding etc for the allocation
+	 */
+	return s->size;
+}
+EXPORT_SYMBOL(ksize);
+
+void kfree(const void *x)
+{
+	struct kmem_cache *s;
+	struct page *page;
+
+	if (!x)
+		return;
+
+	page = virt_to_head_page(x);
+	s = page->slab;
+
+	slab_free(s, page, (void *)x, __builtin_return_address(0));
+}
+EXPORT_SYMBOL(kfree);
+
+/*
+ *  kmem_cache_shrink removes empty slabs from the partial lists
+ *  and then sorts the partially allocated slabs by the number
+ *  of items in use. The slabs with the most items in use
+ *  come first. New allocations will remove these from the
+ *  partial list because they are full. The slabs with the
+ *  least items are placed last. If it happens that the objects
+ *  are freed then the page can be returned to the page allocator.
+ */
+int kmem_cache_shrink(struct kmem_cache *s)
+{
+	int node;
+	int i;
+	struct kmem_cache_node *n;
+	struct page *page;
+	struct page *t;
+	struct list_head *slabs_by_inuse =
+		kmalloc(sizeof(struct list_head) * s->objects, GFP_KERNEL);
+	unsigned long flags;
+
+	if (!slabs_by_inuse)
+		return -ENOMEM;
+
+	flush_all(s);
+	for_each_online_node(node) {
+		n = get_node(s, node);
+
+		if (!n->nr_partial)
+			continue;
+
+		for (i = 0; i < s->objects; i++)
+			INIT_LIST_HEAD(slabs_by_inuse + i);
+
+		spin_lock_irqsave(&n->list_lock, flags);
+
+		/*
+		 * Build lists indexed by the items in use in
+		 * each slab or free slabs if empty.
+		 *
+		 * Note that concurrent frees may occur while
+		 * we hold the list_lock. page->inuse here is
+		 * the upper limit.
+		 */
+		list_for_each_entry_safe(page, t, &n->partial, lru) {
+			if (!page->inuse && slab_trylock(page)) {
+				/*
+				 * Must hold slab lock here because slab_free
+				 * may have freed the last object and be
+				 * waiting to release the slab.
+				 */
+				list_del(&page->lru);
+				n->nr_partial--;
+				slab_unlock(page);
+				discard_slab(s, page);
+			} else {
+				if (n->nr_partial > MAX_PARTIAL)
+					list_move(&page->lru,
+					slabs_by_inuse + page->inuse);
+			}
+		}
+
+		if (n->nr_partial <= MAX_PARTIAL)
+			goto out;
+
+		/*
+		 * Rebuild the partial list with the slabs filled up
+		 * most first and the least used slabs at the end.
+		 */
+		for (i = s->objects - 1; i >= 0; i--)
+			list_splice(slabs_by_inuse + i, n->partial.prev);
+
+	out:
+		spin_unlock_irqrestore(&n->list_lock, flags);
+	}
+
+	kfree(slabs_by_inuse);
+	return 0;
+}
+EXPORT_SYMBOL(kmem_cache_shrink);
+
+/**
+ * krealloc - reallocate memory. The contents will remain unchanged.
+ *
+ * @p: object to reallocate memory for.
+ * @new_size: how many bytes of memory are required.
+ * @flags: the type of memory to allocate.
+ *
+ * The contents of the object pointed to are preserved up to the
+ * lesser of the new and old sizes.  If @p is %NULL, krealloc()
+ * behaves exactly like kmalloc().  If @size is 0 and @p is not a
+ * %NULL pointer, the object pointed to is freed.
+ */
+void *krealloc(const void *p, size_t new_size, gfp_t flags)
+{
+	struct kmem_cache *new_cache;
+	void *ret;
+	struct page *page;
+
+	if (unlikely(!p))
+		return kmalloc(new_size, flags);
+
+	if (unlikely(!new_size)) {
+		kfree(p);
+		return NULL;
+	}
+
+	page = virt_to_head_page(p);
+
+	new_cache = get_slab(new_size, flags);
+
+	/*
+ 	 * If new size fits in the current cache, bail out.
+ 	 */
+	if (likely(page->slab == new_cache))
+		return (void *)p;
+
+	ret = kmalloc(new_size, flags);
+	if (ret) {
+		memcpy(ret, p, min(new_size, ksize(p)));
+		kfree(p);
+	}
+	return ret;
+}
+EXPORT_SYMBOL(krealloc);
+
+/********************************************************************
+ *			Basic setup of slabs
+ *******************************************************************/
+
+void __init kmem_cache_init(void)
+{
+	int i;
+
+#ifdef CONFIG_NUMA
+	/*
+	 * Must first have the slab cache available for the allocations of the
+	 * struct kmalloc_cache_node's. There is special bootstrap code in
+	 * kmem_cache_open for slab_state == DOWN.
+	 */
+	create_kmalloc_cache(&kmalloc_caches[0], "kmem_cache_node",
+		sizeof(struct kmem_cache_node), GFP_KERNEL);
+#endif
+
+	/* Able to allocate the per node structures */
+	slab_state = PARTIAL;
+
+	/* Caches that are not of the two-to-the-power-of size */
+	create_kmalloc_cache(&kmalloc_caches[1],
+				"kmalloc-96", 96, GFP_KERNEL);
+	create_kmalloc_cache(&kmalloc_caches[2],
+				"kmalloc-192", 192, GFP_KERNEL);
+
+	for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++)
+		create_kmalloc_cache(&kmalloc_caches[i],
+			"kmalloc", 1 << i, GFP_KERNEL);
+
+	slab_state = UP;
+
+	/* Provide the correct kmalloc names now that the caches are up */
+	for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++)
+		kmalloc_caches[i]. name =
+			kasprintf(GFP_KERNEL, "kmalloc-%d", 1 << i);
+
+#ifdef CONFIG_SMP
+	register_cpu_notifier(&slab_notifier);
+#endif
+
+	if (nr_cpu_ids)	/* Remove when nr_cpu_ids is fixed upstream ! */
+		kmem_size = offsetof(struct kmem_cache, cpu_slab)
+			 + nr_cpu_ids * sizeof(struct page *);
+
+	printk(KERN_INFO "SLUB: Genslabs=%d, HWalign=%d, Order=%d-%d, MinObjects=%d,"
+		" Processors=%d, Nodes=%d\n",
+		KMALLOC_SHIFT_HIGH, L1_CACHE_BYTES,
+		slub_min_order, slub_max_order, slub_min_objects,
+		nr_cpu_ids, nr_node_ids);
+}
+
+/*
+ * Find a mergeable slab cache
+ */
+static int slab_unmergeable(struct kmem_cache *s)
+{
+	if (slub_nomerge || (s->flags & SLUB_NEVER_MERGE))
+		return 1;
+
+	if (s->ctor || s->dtor)
+		return 1;
+
+	return 0;
+}
+
+static struct kmem_cache *find_mergeable(size_t size,
+		size_t align, unsigned long flags,
+		void (*ctor)(void *, struct kmem_cache *, unsigned long),
+		void (*dtor)(void *, struct kmem_cache *, unsigned long))
+{
+	struct list_head *h;
+
+	if (slub_nomerge || (flags & SLUB_NEVER_MERGE))
+		return NULL;
+
+	if (ctor || dtor)
+		return NULL;
+
+	size = ALIGN(size, sizeof(void *));
+	align = calculate_alignment(flags, align, size);
+	size = ALIGN(size, align);
+
+	list_for_each(h, &slab_caches) {
+		struct kmem_cache *s =
+			container_of(h, struct kmem_cache, list);
+
+		if (slab_unmergeable(s))
+			continue;
+
+		if (size > s->size)
+			continue;
+
+		if (((flags | slub_debug) & SLUB_MERGE_SAME) !=
+			(s->flags & SLUB_MERGE_SAME))
+				continue;
+		/*
+		 * Check if alignment is compatible.
+		 * Courtesy of Adrian Drzewiecki
+		 */
+		if ((s->size & ~(align -1)) != s->size)
+			continue;
+
+		if (s->size - size >= sizeof(void *))
+			continue;
+
+		return s;
+	}
+	return NULL;
+}
+
+struct kmem_cache *kmem_cache_create(const char *name, size_t size,
+		size_t align, unsigned long flags,
+		void (*ctor)(void *, struct kmem_cache *, unsigned long),
+		void (*dtor)(void *, struct kmem_cache *, unsigned long))
+{
+	struct kmem_cache *s;
+
+	down_write(&slub_lock);
+	s = find_mergeable(size, align, flags, dtor, ctor);
+	if (s) {
+		s->refcount++;
+		/*
+		 * Adjust the object sizes so that we clear
+		 * the complete object on kzalloc.
+		 */
+		s->objsize = max(s->objsize, (int)size);
+		s->inuse = max_t(int, s->inuse, ALIGN(size, sizeof(void *)));
+		if (sysfs_slab_alias(s, name))
+			goto err;
+	} else {
+		s = kmalloc(kmem_size, GFP_KERNEL);
+		if (s && kmem_cache_open(s, GFP_KERNEL, name,
+				size, align, flags, ctor, dtor)) {
+			if (sysfs_slab_add(s)) {
+				kfree(s);
+				goto err;
+			}
+			list_add(&s->list, &slab_caches);
+		} else
+			kfree(s);
+	}
+	up_write(&slub_lock);
+	return s;
+
+err:
+	up_write(&slub_lock);
+	if (flags & SLAB_PANIC)
+		panic("Cannot create slabcache %s\n", name);
+	else
+		s = NULL;
+	return s;
+}
+EXPORT_SYMBOL(kmem_cache_create);
+
+void *kmem_cache_zalloc(struct kmem_cache *s, gfp_t flags)
+{
+	void *x;
+
+	x = slab_alloc(s, flags, -1, __builtin_return_address(0));
+	if (x)
+		memset(x, 0, s->objsize);
+	return x;
+}
+EXPORT_SYMBOL(kmem_cache_zalloc);
+
+#ifdef CONFIG_SMP
+static void for_all_slabs(void (*func)(struct kmem_cache *, int), int cpu)
+{
+	struct list_head *h;
+
+	down_read(&slub_lock);
+	list_for_each(h, &slab_caches) {
+		struct kmem_cache *s =
+			container_of(h, struct kmem_cache, list);
+
+		func(s, cpu);
+	}
+	up_read(&slub_lock);
+}
+
+/*
+ * Use the cpu notifier to insure that the slab are flushed
+ * when necessary.
+ */
+static int __cpuinit slab_cpuup_callback(struct notifier_block *nfb,
+		unsigned long action, void *hcpu)
+{
+	long cpu = (long)hcpu;
+
+	switch (action) {
+	case CPU_UP_CANCELED:
+	case CPU_DEAD:
+		for_all_slabs(__flush_cpu_slab, cpu);
+		break;
+	default:
+		break;
+	}
+	return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata slab_notifier =
+	{ &slab_cpuup_callback, NULL, 0 };
+
+#endif
+
+#ifdef CONFIG_NUMA
+
+/*****************************************************************
+ * Generic reaper used to support the page allocator
+ * (the cpu slabs are reaped by a per slab workqueue).
+ *
+ * Maybe move this to the page allocator?
+ ****************************************************************/
+
+static DEFINE_PER_CPU(unsigned long, reap_node);
+
+static void init_reap_node(int cpu)
+{
+	int node;
+
+	node = next_node(cpu_to_node(cpu), node_online_map);
+	if (node == MAX_NUMNODES)
+		node = first_node(node_online_map);
+
+	__get_cpu_var(reap_node) = node;
+}
+
+static void next_reap_node(void)
+{
+	int node = __get_cpu_var(reap_node);
+
+	/*
+	 * Also drain per cpu pages on remote zones
+	 */
+	if (node != numa_node_id())
+		drain_node_pages(node);
+
+	node = next_node(node, node_online_map);
+	if (unlikely(node >= MAX_NUMNODES))
+		node = first_node(node_online_map);
+	__get_cpu_var(reap_node) = node;
+}
+#else
+#define init_reap_node(cpu) do { } while (0)
+#define next_reap_node(void) do { } while (0)
+#endif
+
+#define REAPTIMEOUT_CPUC	(2*HZ)
+
+#ifdef CONFIG_SMP
+static DEFINE_PER_CPU(struct delayed_work, reap_work);
+
+static void cache_reap(struct work_struct *unused)
+{
+	next_reap_node();
+	refresh_cpu_vm_stats(smp_processor_id());
+	schedule_delayed_work(&__get_cpu_var(reap_work),
+				      REAPTIMEOUT_CPUC);
+}
+
+static void __devinit start_cpu_timer(int cpu)
+{
+	struct delayed_work *reap_work = &per_cpu(reap_work, cpu);
+
+	/*
+	 * When this gets called from do_initcalls via cpucache_init(),
+	 * init_workqueues() has already run, so keventd will be setup
+	 * at that time.
+	 */
+	if (keventd_up() && reap_work->work.func == NULL) {
+		init_reap_node(cpu);
+		INIT_DELAYED_WORK(reap_work, cache_reap);
+		schedule_delayed_work_on(cpu, reap_work, HZ + 3 * cpu);
+	}
+}
+
+static int __init cpucache_init(void)
+{
+	int cpu;
+
+	/*
+	 * Register the timers that drain pcp pages and update vm statistics
+	 */
+	for_each_online_cpu(cpu)
+		start_cpu_timer(cpu);
+	return 0;
+}
+__initcall(cpucache_init);
+#endif
+
+#ifdef SLUB_RESILIENCY_TEST
+static unsigned long validate_slab_cache(struct kmem_cache *s);
+
+static void resiliency_test(void)
+{
+	u8 *p;
+
+	printk(KERN_ERR "SLUB resiliency testing\n");
+	printk(KERN_ERR "-----------------------\n");
+	printk(KERN_ERR "A. Corruption after allocation\n");
+
+	p = kzalloc(16, GFP_KERNEL);
+	p[16] = 0x12;
+	printk(KERN_ERR "\n1. kmalloc-16: Clobber Redzone/next pointer"
+			" 0x12->0x%p\n\n", p + 16);
+
+	validate_slab_cache(kmalloc_caches + 4);
+
+	/* Hmmm... The next two are dangerous */
+	p = kzalloc(32, GFP_KERNEL);
+	p[32 + sizeof(void *)] = 0x34;
+	printk(KERN_ERR "\n2. kmalloc-32: Clobber next pointer/next slab"
+		 	" 0x34 -> -0x%p\n", p);
+	printk(KERN_ERR "If allocated object is overwritten then not detectable\n\n");
+
+	validate_slab_cache(kmalloc_caches + 5);
+	p = kzalloc(64, GFP_KERNEL);
+	p += 64 + (get_cycles() & 0xff) * sizeof(void *);
+	*p = 0x56;
+	printk(KERN_ERR "\n3. kmalloc-64: corrupting random byte 0x56->0x%p\n",
+									p);
+	printk(KERN_ERR "If allocated object is overwritten then not detectable\n\n");
+	validate_slab_cache(kmalloc_caches + 6);
+
+	printk(KERN_ERR "\nB. Corruption after free\n");
+	p = kzalloc(128, GFP_KERNEL);
+	kfree(p);
+	*p = 0x78;
+	printk(KERN_ERR "1. kmalloc-128: Clobber first word 0x78->0x%p\n\n", p);
+	validate_slab_cache(kmalloc_caches + 7);
+
+	p = kzalloc(256, GFP_KERNEL);
+	kfree(p);
+	p[50] = 0x9a;
+	printk(KERN_ERR "\n2. kmalloc-256: Clobber 50th byte 0x9a->0x%p\n\n", p);
+	validate_slab_cache(kmalloc_caches + 8);
+
+	p = kzalloc(512, GFP_KERNEL);
+	kfree(p);
+	p[512] = 0xab;
+	printk(KERN_ERR "\n3. kmalloc-512: Clobber redzone 0xab->0x%p\n\n", p);
+	validate_slab_cache(kmalloc_caches + 9);
+}
+#else
+static void resiliency_test(void) {};
+#endif
+
+/*
+ * These are not as efficient as kmalloc for the non debug case.
+ * We do not have the page struct available so we have to touch one
+ * cacheline in struct kmem_cache to check slab flags.
+ */
+void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, void *caller)
+{
+	struct kmem_cache *s = get_slab(size, gfpflags);
+
+	if (!s)
+		return NULL;
+
+	return slab_alloc(s, gfpflags, -1, caller);
+}
+
+void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
+					int node, void *caller)
+{
+	struct kmem_cache *s = get_slab(size, gfpflags);
+
+	if (!s)
+		return NULL;
+
+	return slab_alloc(s, gfpflags, node, caller);
+}
+
+#ifdef CONFIG_SYSFS
+
+static int validate_slab(struct kmem_cache *s, struct page *page)
+{
+	void *p;
+	void *addr = page_address(page);
+	unsigned long map[BITS_TO_LONGS(s->objects)];
+
+	if (!check_slab(s, page) ||
+			!on_freelist(s, page, NULL))
+		return 0;
+
+	/* Now we know that a valid freelist exists */
+	bitmap_zero(map, s->objects);
+
+	for(p = page->freelist; p; p = get_freepointer(s, p)) {
+		set_bit((p - addr) / s->size, map);
+		if (!check_object(s, page, p, 0))
+			return 0;
+	}
+
+	for(p = addr; p < addr + s->objects * s->size; p += s->size)
+		if (!test_bit((p - addr) / s->size, map))
+			if (!check_object(s, page, p, 1))
+				return 0;
+	return 1;
+}
+
+static void validate_slab_slab(struct kmem_cache *s, struct page *page)
+{
+	if (slab_trylock(page)) {
+		validate_slab(s, page);
+		slab_unlock(page);
+	} else
+		printk(KERN_INFO "SLUB %s: Skipped busy slab 0x%p\n",
+			s->name, page);
+
+	if (s->flags & DEBUG_DEFAULT_FLAGS) {
+		if (!PageError(page))
+			printk(KERN_ERR "SLUB %s: PageError not set "
+				"on slab 0x%p\n", s->name, page);
+	} else {
+		if (PageError(page))
+			printk(KERN_ERR "SLUB %s: PageError set on "
+				"slab 0x%p\n", s->name, page);
+	}
+}
+
+static int validate_slab_node(struct kmem_cache *s, struct kmem_cache_node *n)
+{
+	unsigned long count = 0;
+	struct page *page;
+	unsigned long flags;
+
+	spin_lock_irqsave(&n->list_lock, flags);
+
+	list_for_each_entry(page, &n->partial, lru) {
+		validate_slab_slab(s, page);
+		count++;
+	}
+	if (count != n->nr_partial)
+		printk(KERN_ERR "SLUB %s: %ld partial slabs counted but "
+			"counter=%ld\n", s->name, count, n->nr_partial);
+
+	if (!(s->flags & SLAB_STORE_USER))
+		goto out;
+
+	list_for_each_entry(page, &n->full, lru) {
+		validate_slab_slab(s, page);
+		count++;
+	}
+	if (count != atomic_long_read(&n->nr_slabs))
+		printk(KERN_ERR "SLUB: %s %ld slabs counted but "
+			"counter=%ld\n", s->name, count,
+			atomic_long_read(&n->nr_slabs));
+
+out:
+	spin_unlock_irqrestore(&n->list_lock, flags);
+	return count;
+}
+
+static unsigned long validate_slab_cache(struct kmem_cache *s)
+{
+	int node;
+	unsigned long count = 0;
+
+	flush_all(s);
+	for_each_online_node(node) {
+		struct kmem_cache_node *n = get_node(s, node);
+
+		count += validate_slab_node(s, n);
+	}
+	return count;
+}
+
+/*
+ * Generate lists of locations where slabcache objects are allocated
+ * and freed.
+ */
+
+struct location {
+	unsigned long count;
+	void *addr;
+};
+
+struct loc_track {
+	unsigned long max;
+	unsigned long count;
+	struct location *loc;
+};
+
+static void free_loc_track(struct loc_track *t)
+{
+	if (t->max)
+		free_pages((unsigned long)t->loc,
+			get_order(sizeof(struct location) * t->max));
+}
+
+static int alloc_loc_track(struct loc_track *t, unsigned long max)
+{
+	struct location *l;
+	int order;
+
+	if (!max)
+		max = PAGE_SIZE / sizeof(struct location);
+
+	order = get_order(sizeof(struct location) * max);
+
+	l = (void *)__get_free_pages(GFP_KERNEL, order);
+
+	if (!l)
+		return 0;
+
+	if (t->count) {
+		memcpy(l, t->loc, sizeof(struct location) * t->count);
+		free_loc_track(t);
+	}
+	t->max = max;
+	t->loc = l;
+	return 1;
+}
+
+static int add_location(struct loc_track *t, struct kmem_cache *s,
+						void *addr)
+{
+	long start, end, pos;
+	struct location *l;
+	void *caddr;
+
+	start = -1;
+	end = t->count;
+
+	for ( ; ; ) {
+		pos = start + (end - start + 1) / 2;
+
+		/*
+		 * There is nothing at "end". If we end up there
+		 * we need to add something to before end.
+		 */
+		if (pos == end)
+			break;
+
+		caddr = t->loc[pos].addr;
+		if (addr == caddr) {
+			t->loc[pos].count++;
+			return 1;
+		}
+
+		if (addr < caddr)
+			end = pos;
+		else
+			start = pos;
+	}
+
+	/*
+	 * Not found. Insert new tracking element
+	 */
+	if (t->count >= t->max && !alloc_loc_track(t, 2 * t->max))
+		return 0;
+
+	l = t->loc + pos;
+	if (pos < t->count)
+		memmove(l + 1, l,
+			(t->count - pos) * sizeof(struct location));
+	t->count++;
+	l->count = 1;
+	l->addr = addr;
+	return 1;
+}
+
+static void process_slab(struct loc_track *t, struct kmem_cache *s,
+		struct page *page, enum track_item alloc)
+{
+	void *addr = page_address(page);
+	unsigned long map[BITS_TO_LONGS(s->objects)];
+	void *p;
+
+	bitmap_zero(map, s->objects);
+	for (p = page->freelist; p; p = get_freepointer(s, p))
+		set_bit((p - addr) / s->size, map);
+
+	for (p = addr; p < addr + s->objects * s->size; p += s->size)
+		if (!test_bit((p - addr) / s->size, map)) {
+			void *addr = get_track(s, p, alloc)->addr;
+
+			add_location(t, s, addr);
+		}
+}
+
+static int list_locations(struct kmem_cache *s, char *buf,
+					enum track_item alloc)
+{
+	int n = 0;
+	unsigned long i;
+	struct loc_track t;
+	int node;
+
+	t.count = 0;
+	t.max = 0;
+
+	/* Push back cpu slabs */
+	flush_all(s);
+
+	for_each_online_node(node) {
+		struct kmem_cache_node *n = get_node(s, node);
+		unsigned long flags;
+		struct page *page;
+
+		if (!atomic_read(&n->nr_slabs))
+			continue;
+
+		spin_lock_irqsave(&n->list_lock, flags);
+		list_for_each_entry(page, &n->partial, lru)
+			process_slab(&t, s, page, alloc);
+		list_for_each_entry(page, &n->full, lru)
+			process_slab(&t, s, page, alloc);
+		spin_unlock_irqrestore(&n->list_lock, flags);
+	}
+
+	for (i = 0; i < t.count; i++) {
+		void *addr = t.loc[i].addr;
+
+		if (n > PAGE_SIZE - 100)
+			break;
+		n += sprintf(buf + n, "%7ld ", t.loc[i].count);
+		if (addr)
+			n += sprint_symbol(buf + n, (unsigned long)t.loc[i].addr);
+		else
+			n += sprintf(buf + n, "<not-available>");
+		n += sprintf(buf + n, "\n");
+	}
+
+	free_loc_track(&t);
+	if (!t.count)
+		n += sprintf(buf, "No data\n");
+	return n;
+}
+
+static unsigned long count_partial(struct kmem_cache_node *n)
+{
+	unsigned long flags;
+	unsigned long x = 0;
+	struct page *page;
+
+	spin_lock_irqsave(&n->list_lock, flags);
+	list_for_each_entry(page, &n->partial, lru)
+		x += page->inuse;
+	spin_unlock_irqrestore(&n->list_lock, flags);
+	return x;
+}
+
+enum slab_stat_type {
+	SL_FULL,
+	SL_PARTIAL,
+	SL_CPU,
+	SL_OBJECTS
+};
+
+#define SO_FULL		(1 << SL_FULL)
+#define SO_PARTIAL	(1 << SL_PARTIAL)
+#define SO_CPU		(1 << SL_CPU)
+#define SO_OBJECTS	(1 << SL_OBJECTS)
+
+static unsigned long slab_objects(struct kmem_cache *s,
+			char *buf, unsigned long flags)
+{
+	unsigned long total = 0;
+	int cpu;
+	int node;
+	int x;
+	unsigned long *nodes;
+	unsigned long *per_cpu;
+
+	nodes = kzalloc(2 * sizeof(unsigned long) * nr_node_ids, GFP_KERNEL);
+	per_cpu = nodes + nr_node_ids;
+
+	for_each_possible_cpu(cpu) {
+		struct page *page = s->cpu_slab[cpu];
+		int node;
+
+		if (page) {
+			node = page_to_nid(page);
+			if (flags & SO_CPU) {
+				int x = 0;
+
+				if (flags & SO_OBJECTS)
+					x = page->inuse;
+				else
+					x = 1;
+				total += x;
+				nodes[node] += x;
+			}
+			per_cpu[node]++;
+		}
+	}
+
+	for_each_online_node(node) {
+		struct kmem_cache_node *n = get_node(s, node);
+
+		if (flags & SO_PARTIAL) {
+			if (flags & SO_OBJECTS)
+				x = count_partial(n);
+			else
+				x = n->nr_partial;
+			total += x;
+			nodes[node] += x;
+		}
+
+		if (flags & SO_FULL) {
+			int full_slabs = atomic_read(&n->nr_slabs)
+					- per_cpu[node]
+					- n->nr_partial;
+
+			if (flags & SO_OBJECTS)
+				x = full_slabs * s->objects;
+			else
+				x = full_slabs;
+			total += x;
+			nodes[node] += x;
+		}
+	}
+
+	x = sprintf(buf, "%lu", total);
+#ifdef CONFIG_NUMA
+	for_each_online_node(node)
+		if (nodes[node])
+			x += sprintf(buf + x, " N%d=%lu",
+					node, nodes[node]);
+#endif
+	kfree(nodes);
+	return x + sprintf(buf + x, "\n");
+}
+
+static int any_slab_objects(struct kmem_cache *s)
+{
+	int node;
+	int cpu;
+
+	for_each_possible_cpu(cpu)
+		if (s->cpu_slab[cpu])
+			return 1;
+
+	for_each_node(node) {
+		struct kmem_cache_node *n = get_node(s, node);
+
+		if (n->nr_partial || atomic_read(&n->nr_slabs))
+			return 1;
+	}
+	return 0;
+}
+
+#define to_slab_attr(n) container_of(n, struct slab_attribute, attr)
+#define to_slab(n) container_of(n, struct kmem_cache, kobj);
+
+struct slab_attribute {
+	struct attribute attr;
+	ssize_t (*show)(struct kmem_cache *s, char *buf);
+	ssize_t (*store)(struct kmem_cache *s, const char *x, size_t count);
+};
+
+#define SLAB_ATTR_RO(_name) \
+	static struct slab_attribute _name##_attr = __ATTR_RO(_name)
+
+#define SLAB_ATTR(_name) \
+	static struct slab_attribute _name##_attr =  \
+	__ATTR(_name, 0644, _name##_show, _name##_store)
+
+static ssize_t slab_size_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", s->size);
+}
+SLAB_ATTR_RO(slab_size);
+
+static ssize_t align_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", s->align);
+}
+SLAB_ATTR_RO(align);
+
+static ssize_t object_size_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", s->objsize);
+}
+SLAB_ATTR_RO(object_size);
+
+static ssize_t objs_per_slab_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", s->objects);
+}
+SLAB_ATTR_RO(objs_per_slab);
+
+static ssize_t order_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", s->order);
+}
+SLAB_ATTR_RO(order);
+
+static ssize_t ctor_show(struct kmem_cache *s, char *buf)
+{
+	if (s->ctor) {
+		int n = sprint_symbol(buf, (unsigned long)s->ctor);
+
+		return n + sprintf(buf + n, "\n");
+	}
+	return 0;
+}
+SLAB_ATTR_RO(ctor);
+
+static ssize_t dtor_show(struct kmem_cache *s, char *buf)
+{
+	if (s->dtor) {
+		int n = sprint_symbol(buf, (unsigned long)s->dtor);
+
+		return n + sprintf(buf + n, "\n");
+	}
+	return 0;
+}
+SLAB_ATTR_RO(dtor);
+
+static ssize_t aliases_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", s->refcount - 1);
+}
+SLAB_ATTR_RO(aliases);
+
+static ssize_t slabs_show(struct kmem_cache *s, char *buf)
+{
+	return slab_objects(s, buf, SO_FULL|SO_PARTIAL|SO_CPU);
+}
+SLAB_ATTR_RO(slabs);
+
+static ssize_t partial_show(struct kmem_cache *s, char *buf)
+{
+	return slab_objects(s, buf, SO_PARTIAL);
+}
+SLAB_ATTR_RO(partial);
+
+static ssize_t cpu_slabs_show(struct kmem_cache *s, char *buf)
+{
+	return slab_objects(s, buf, SO_CPU);
+}
+SLAB_ATTR_RO(cpu_slabs);
+
+static ssize_t objects_show(struct kmem_cache *s, char *buf)
+{
+	return slab_objects(s, buf, SO_FULL|SO_PARTIAL|SO_CPU|SO_OBJECTS);
+}
+SLAB_ATTR_RO(objects);
+
+static ssize_t sanity_checks_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", !!(s->flags & SLAB_DEBUG_FREE));
+}
+
+static ssize_t sanity_checks_store(struct kmem_cache *s,
+				const char *buf, size_t length)
+{
+	s->flags &= ~SLAB_DEBUG_FREE;
+	if (buf[0] == '1')
+		s->flags |= SLAB_DEBUG_FREE;
+	return length;
+}
+SLAB_ATTR(sanity_checks);
+
+static ssize_t trace_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", !!(s->flags & SLAB_TRACE));
+}
+
+static ssize_t trace_store(struct kmem_cache *s, const char *buf,
+							size_t length)
+{
+	s->flags &= ~SLAB_TRACE;
+	if (buf[0] == '1')
+		s->flags |= SLAB_TRACE;
+	return length;
+}
+SLAB_ATTR(trace);
+
+static ssize_t reclaim_account_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", !!(s->flags & SLAB_RECLAIM_ACCOUNT));
+}
+
+static ssize_t reclaim_account_store(struct kmem_cache *s,
+				const char *buf, size_t length)
+{
+	s->flags &= ~SLAB_RECLAIM_ACCOUNT;
+	if (buf[0] == '1')
+		s->flags |= SLAB_RECLAIM_ACCOUNT;
+	return length;
+}
+SLAB_ATTR(reclaim_account);
+
+static ssize_t hwcache_align_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", !!(s->flags & SLAB_HWCACHE_ALIGN));
+}
+SLAB_ATTR_RO(hwcache_align);
+
+#ifdef CONFIG_ZONE_DMA
+static ssize_t cache_dma_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", !!(s->flags & SLAB_CACHE_DMA));
+}
+SLAB_ATTR_RO(cache_dma);
+#endif
+
+static ssize_t destroy_by_rcu_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", !!(s->flags & SLAB_DESTROY_BY_RCU));
+}
+SLAB_ATTR_RO(destroy_by_rcu);
+
+static ssize_t red_zone_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", !!(s->flags & SLAB_RED_ZONE));
+}
+
+static ssize_t red_zone_store(struct kmem_cache *s,
+				const char *buf, size_t length)
+{
+	if (any_slab_objects(s))
+		return -EBUSY;
+
+	s->flags &= ~SLAB_RED_ZONE;
+	if (buf[0] == '1')
+		s->flags |= SLAB_RED_ZONE;
+	calculate_sizes(s);
+	return length;
+}
+SLAB_ATTR(red_zone);
+
+static ssize_t poison_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", !!(s->flags & SLAB_POISON));
+}
+
+static ssize_t poison_store(struct kmem_cache *s,
+				const char *buf, size_t length)
+{
+	if (any_slab_objects(s))
+		return -EBUSY;
+
+	s->flags &= ~SLAB_POISON;
+	if (buf[0] == '1')
+		s->flags |= SLAB_POISON;
+	calculate_sizes(s);
+	return length;
+}
+SLAB_ATTR(poison);
+
+static ssize_t store_user_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", !!(s->flags & SLAB_STORE_USER));
+}
+
+static ssize_t store_user_store(struct kmem_cache *s,
+				const char *buf, size_t length)
+{
+	if (any_slab_objects(s))
+		return -EBUSY;
+
+	s->flags &= ~SLAB_STORE_USER;
+	if (buf[0] == '1')
+		s->flags |= SLAB_STORE_USER;
+	calculate_sizes(s);
+	return length;
+}
+SLAB_ATTR(store_user);
+
+static ssize_t validate_show(struct kmem_cache *s, char *buf)
+{
+	return 0;
+}
+
+static ssize_t validate_store(struct kmem_cache *s,
+			const char *buf, size_t length)
+{
+	if (buf[0] == '1')
+		validate_slab_cache(s);
+	else
+		return -EINVAL;
+	return length;
+}
+SLAB_ATTR(validate);
+
+static ssize_t shrink_show(struct kmem_cache *s, char *buf)
+{
+	return 0;
+}
+
+static ssize_t shrink_store(struct kmem_cache *s,
+			const char *buf, size_t length)
+{
+	if (buf[0] == '1') {
+		int rc = kmem_cache_shrink(s);
+
+		if (rc)
+			return rc;
+	} else
+		return -EINVAL;
+	return length;
+}
+SLAB_ATTR(shrink);
+
+static ssize_t alloc_calls_show(struct kmem_cache *s, char *buf)
+{
+	if (!(s->flags & SLAB_STORE_USER))
+		return -ENOSYS;
+	return list_locations(s, buf, TRACK_ALLOC);
+}
+SLAB_ATTR_RO(alloc_calls);
+
+static ssize_t free_calls_show(struct kmem_cache *s, char *buf)
+{
+	if (!(s->flags & SLAB_STORE_USER))
+		return -ENOSYS;
+	return list_locations(s, buf, TRACK_FREE);
+}
+SLAB_ATTR_RO(free_calls);
+
+#ifdef CONFIG_NUMA
+static ssize_t defrag_ratio_show(struct kmem_cache *s, char *buf)
+{
+	return sprintf(buf, "%d\n", s->defrag_ratio / 10);
+}
+
+static ssize_t defrag_ratio_store(struct kmem_cache *s,
+				const char *buf, size_t length)
+{
+	int n = simple_strtoul(buf, NULL, 10);
+
+	if (n < 100)
+		s->defrag_ratio = n * 10;
+	return length;
+}
+SLAB_ATTR(defrag_ratio);
+#endif
+
+static struct attribute * slab_attrs[] = {
+	&slab_size_attr.attr,
+	&object_size_attr.attr,
+	&objs_per_slab_attr.attr,
+	&order_attr.attr,
+	&objects_attr.attr,
+	&slabs_attr.attr,
+	&partial_attr.attr,
+	&cpu_slabs_attr.attr,
+	&ctor_attr.attr,
+	&dtor_attr.attr,
+	&aliases_attr.attr,
+	&align_attr.attr,
+	&sanity_checks_attr.attr,
+	&trace_attr.attr,
+	&hwcache_align_attr.attr,
+	&reclaim_account_attr.attr,
+	&destroy_by_rcu_attr.attr,
+	&red_zone_attr.attr,
+	&poison_attr.attr,
+	&store_user_attr.attr,
+	&validate_attr.attr,
+	&shrink_attr.attr,
+	&alloc_calls_attr.attr,
+	&free_calls_attr.attr,
+#ifdef CONFIG_ZONE_DMA
+	&cache_dma_attr.attr,
+#endif
+#ifdef CONFIG_NUMA
+	&defrag_ratio_attr.attr,
+#endif
+	NULL
+};
+
+static struct attribute_group slab_attr_group = {
+	.attrs = slab_attrs,
+};
+
+static ssize_t slab_attr_show(struct kobject *kobj,
+				struct attribute *attr,
+				char *buf)
+{
+	struct slab_attribute *attribute;
+	struct kmem_cache *s;
+	int err;
+
+	attribute = to_slab_attr(attr);
+	s = to_slab(kobj);
+
+	if (!attribute->show)
+		return -EIO;
+
+	err = attribute->show(s, buf);
+
+	return err;
+}
+
+static ssize_t slab_attr_store(struct kobject *kobj,
+				struct attribute *attr,
+				const char *buf, size_t len)
+{
+	struct slab_attribute *attribute;
+	struct kmem_cache *s;
+	int err;
+
+	attribute = to_slab_attr(attr);
+	s = to_slab(kobj);
+
+	if (!attribute->store)
+		return -EIO;
+
+	err = attribute->store(s, buf, len);
+
+	return err;
+}
+
+static struct sysfs_ops slab_sysfs_ops = {
+	.show = slab_attr_show,
+	.store = slab_attr_store,
+};
+
+static struct kobj_type slab_ktype = {
+	.sysfs_ops = &slab_sysfs_ops,
+};
+
+static int uevent_filter(struct kset *kset, struct kobject *kobj)
+{
+	struct kobj_type *ktype = get_ktype(kobj);
+
+	if (ktype == &slab_ktype)
+		return 1;
+	return 0;
+}
+
+static struct kset_uevent_ops slab_uevent_ops = {
+	.filter = uevent_filter,
+};
+
+decl_subsys(slab, &slab_ktype, &slab_uevent_ops);
+
+#define ID_STR_LENGTH 64
+
+/* Create a unique string id for a slab cache:
+ * format
+ * :[flags-]size:[memory address of kmemcache]
+ */
+static char *create_unique_id(struct kmem_cache *s)
+{
+	char *name = kmalloc(ID_STR_LENGTH, GFP_KERNEL);
+	char *p = name;
+
+	BUG_ON(!name);
+
+	*p++ = ':';
+	/*
+	 * First flags affecting slabcache operations. We will only
+	 * get here for aliasable slabs so we do not need to support
+	 * too many flags. The flags here must cover all flags that
+	 * are matched during merging to guarantee that the id is
+	 * unique.
+	 */
+	if (s->flags & SLAB_CACHE_DMA)
+		*p++ = 'd';
+	if (s->flags & SLAB_RECLAIM_ACCOUNT)
+		*p++ = 'a';
+	if (s->flags & SLAB_DEBUG_FREE)
+		*p++ = 'F';
+	if (p != name + 1)
+		*p++ = '-';
+	p += sprintf(p, "%07d", s->size);
+	BUG_ON(p > name + ID_STR_LENGTH - 1);
+	return name;
+}
+
+static int sysfs_slab_add(struct kmem_cache *s)
+{
+	int err;
+	const char *name;
+	int unmergeable;
+
+	if (slab_state < SYSFS)
+		/* Defer until later */
+		return 0;
+
+	unmergeable = slab_unmergeable(s);
+	if (unmergeable) {
+		/*
+		 * Slabcache can never be merged so we can use the name proper.
+		 * This is typically the case for debug situations. In that
+		 * case we can catch duplicate names easily.
+		 */
+		sysfs_remove_link(&slab_subsys.kobj, s->name);
+		name = s->name;
+	} else {
+		/*
+		 * Create a unique name for the slab as a target
+		 * for the symlinks.
+		 */
+		name = create_unique_id(s);
+	}
+
+	kobj_set_kset_s(s, slab_subsys);
+	kobject_set_name(&s->kobj, name);
+	kobject_init(&s->kobj);
+	err = kobject_add(&s->kobj);
+	if (err)
+		return err;
+
+	err = sysfs_create_group(&s->kobj, &slab_attr_group);
+	if (err)
+		return err;
+	kobject_uevent(&s->kobj, KOBJ_ADD);
+	if (!unmergeable) {
+		/* Setup first alias */
+		sysfs_slab_alias(s, s->name);
+		kfree(name);
+	}
+	return 0;
+}
+
+static void sysfs_slab_remove(struct kmem_cache *s)
+{
+	kobject_uevent(&s->kobj, KOBJ_REMOVE);
+	kobject_del(&s->kobj);
+}
+
+/*
+ * Need to buffer aliases during bootup until sysfs becomes
+ * available lest we loose that information.
+ */
+struct saved_alias {
+	struct kmem_cache *s;
+	const char *name;
+	struct saved_alias *next;
+};
+
+struct saved_alias *alias_list;
+
+static int sysfs_slab_alias(struct kmem_cache *s, const char *name)
+{
+	struct saved_alias *al;
+
+	if (slab_state == SYSFS) {
+		/*
+		 * If we have a leftover link then remove it.
+		 */
+		sysfs_remove_link(&slab_subsys.kobj, name);
+		return sysfs_create_link(&slab_subsys.kobj,
+						&s->kobj, name);
+	}
+
+	al = kmalloc(sizeof(struct saved_alias), GFP_KERNEL);
+	if (!al)
+		return -ENOMEM;
+
+	al->s = s;
+	al->name = name;
+	al->next = alias_list;
+	alias_list = al;
+	return 0;
+}
+
+static int __init slab_sysfs_init(void)
+{
+	int err;
+
+	err = subsystem_register(&slab_subsys);
+	if (err) {
+		printk(KERN_ERR "Cannot register slab subsystem.\n");
+		return -ENOSYS;
+	}
+
+	finish_bootstrap();
+
+	while (alias_list) {
+		struct saved_alias *al = alias_list;
+
+		alias_list = alias_list->next;
+		err = sysfs_slab_alias(al->s, al->name);
+		BUG_ON(err);
+		kfree(al);
+	}
+
+	resiliency_test();
+	return 0;
+}
+
+__initcall(slab_sysfs_init);
+#else
+__initcall(finish_bootstrap);
+#endif