[SLUB 1/2] SLUB core
From: Christoph Lameter
Date: Sat Mar 31 2007 - 15:31:55 EST
SLUB Core patch V6
This provides basic SLUB functionality and allows a choice of
slab allocators during kernel configuration. The default is still
slab. SLUB has been tested in various configurations but I think we
can be quite sure that there are still remaining issues.
SLUB is not selectable on platforms that modify the page structs of
slab memory (i386, FRV) but see the next patch for a i386 fix.
Signed-off-by: Christoph Lameter <clameter@xxxxxxx>
Index: linux-2.6.21-rc5-mm3/include/linux/mm_types.h
===================================================================
--- linux-2.6.21-rc5-mm3.orig/include/linux/mm_types.h 2007-03-30 21:50:18.000000000 -0700
+++ linux-2.6.21-rc5-mm3/include/linux/mm_types.h 2007-03-30 21:50:42.000000000 -0700
@@ -19,10 +19,16 @@ struct page {
unsigned long flags; /* Atomic flags, some possibly
* updated asynchronously */
atomic_t _count; /* Usage count, see below. */
- atomic_t _mapcount; /* Count of ptes mapped in mms,
+ union {
+ atomic_t _mapcount; /* Count of ptes mapped in mms,
* to show when page is mapped
* & limit reverse map searches.
*/
+ struct { /* SLUB uses */
+ short unsigned int inuse;
+ short unsigned int offset;
+ };
+ };
union {
struct {
unsigned long private; /* Mapping-private opaque data:
@@ -43,8 +49,15 @@ struct page {
#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
spinlock_t ptl;
#endif
+ struct { /* SLUB uses */
+ struct page *first_page; /* Compound pages */
+ struct kmem_cache *slab; /* Pointer to slab */
+ };
+ };
+ union {
+ pgoff_t index; /* Our offset within mapping. */
+ void *freelist; /* SLUB: pointer to free object */
};
- pgoff_t index; /* Our offset within mapping. */
struct list_head lru; /* Pageout list, eg. active_list
* protected by zone->lru_lock !
*/
Index: linux-2.6.21-rc5-mm3/include/linux/slab.h
===================================================================
--- linux-2.6.21-rc5-mm3.orig/include/linux/slab.h 2007-03-30 21:50:18.000000000 -0700
+++ linux-2.6.21-rc5-mm3/include/linux/slab.h 2007-03-30 21:50:42.000000000 -0700
@@ -32,6 +32,7 @@ typedef struct kmem_cache kmem_cache_t _
#define SLAB_PANIC 0x00040000UL /* Panic if kmem_cache_create() fails */
#define SLAB_DESTROY_BY_RCU 0x00080000UL /* Defer freeing slabs to RCU */
#define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
+#define SLAB_TRACE 0x00200000UL /* Trace allocations and frees */
/* Flags passed to a constructor functions */
#define SLAB_CTOR_CONSTRUCTOR 0x001UL /* If not set, then deconstructor */
@@ -42,7 +43,7 @@ typedef struct kmem_cache kmem_cache_t _
* struct kmem_cache related prototypes
*/
void __init kmem_cache_init(void);
-extern int slab_is_available(void);
+int slab_is_available(void);
struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
unsigned long,
@@ -95,9 +96,14 @@ static inline void *kcalloc(size_t n, si
* the appropriate general cache at compile time.
*/
-#ifdef CONFIG_SLAB
+#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB)
+#ifdef CONFIG_SLUB
+#include <linux/slub_def.h>
+#else
#include <linux/slab_def.h>
+#endif /* !CONFIG_SLUB */
#else
+
/*
* Fallback definitions for an allocator not wanting to provide
* its own optimized kmalloc definitions (like SLOB).
@@ -184,7 +190,7 @@ static inline void *__kmalloc_node(size_
* allocator where we care about the real place the memory allocation
* request comes from.
*/
-#ifdef CONFIG_DEBUG_SLAB
+#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB)
extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
#define kmalloc_track_caller(size, flags) \
__kmalloc_track_caller(size, flags, __builtin_return_address(0))
@@ -202,7 +208,7 @@ extern void *__kmalloc_track_caller(size
* standard allocator where we care about the real place the memory
* allocation request comes from.
*/
-#ifdef CONFIG_DEBUG_SLAB
+#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB)
extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, void *);
#define kmalloc_node_track_caller(size, flags, node) \
__kmalloc_node_track_caller(size, flags, node, \
Index: linux-2.6.21-rc5-mm3/include/linux/slub_def.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.21-rc5-mm3/include/linux/slub_def.h 2007-03-30 22:31:02.000000000 -0700
@@ -0,0 +1,206 @@
+#ifndef _LINUX_SLUB_DEF_H
+#define _LINUX_SLUB_DEF_H
+
+/*
+ * SLUB : A Slab allocator without object queues.
+ *
+ * (C) 2007 SGI, Christoph Lameter <clameter@xxxxxxx>
+ */
+#include <linux/types.h>
+#include <linux/gfp.h>
+#include <linux/workqueue.h>
+#include <linux/kobject.h>
+
+struct kmem_cache_node {
+ spinlock_t list_lock; /* Protect partial list and nr_partial */
+ unsigned long nr_partial;
+ atomic_long_t nr_slabs;
+ struct list_head partial;
+};
+
+/*
+ * Slab cache management.
+ */
+struct kmem_cache {
+ /* Used for retriving partial slabs etc */
+ unsigned long flags;
+ int size; /* The size of an object including meta data */
+ int objsize; /* The size of an object without meta data */
+ int offset; /* Free pointer offset. */
+ atomic_t cpu_slabs; /* != 0 -> flusher scheduled. */
+ int defrag_ratio;
+ unsigned int order;
+
+ /*
+ * Avoid an extra cache line for UP, SMP and for the node local to
+ * struct kmem_cache.
+ */
+ struct kmem_cache_node local_node;
+
+ /* Allocation and freeing of slabs */
+ int objects; /* Number of objects in slab */
+ int refcount; /* Refcount for slab cache destroy */
+ void (*ctor)(void *, struct kmem_cache *, unsigned long);
+ void (*dtor)(void *, struct kmem_cache *, unsigned long);
+ int inuse; /* Offset to metadata */
+ int align; /* Alignment */
+ const char *name; /* Name (only for display!) */
+ struct list_head list; /* List of slab caches */
+ struct kobject kobj; /* For sysfs */
+
+#ifdef CONFIG_SMP
+ struct delayed_work flush;
+ struct mutex flushing;
+#endif
+#ifdef CONFIG_NUMA
+ struct kmem_cache_node *node[MAX_NUMNODES];
+#endif
+ struct page *cpu_slab[NR_CPUS];
+};
+
+/*
+ * Kmalloc subsystem.
+ */
+#define KMALLOC_SHIFT_LOW 3
+
+#ifdef CONFIG_LARGE_ALLOCS
+#define KMALLOC_SHIFT_HIGH 25
+#else
+#if !defined(CONFIG_MMU) || NR_CPUS > 512 || MAX_NUMNODES > 256
+#define KMALLOC_SHIFT_HIGH 20
+#else
+#define KMALLOC_SHIFT_HIGH 18
+#endif
+#endif
+
+/*
+ * We keep the general caches in an array of slab caches that are used for
+ * 2^x bytes of allocations.
+ */
+extern struct kmem_cache kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
+
+/*
+ * Sorry that the following has to be that ugly but some versions of GCC
+ * have trouble with constant propagation and loops.
+ */
+static inline int kmalloc_index(int size)
+{
+ if (size == 0)
+ return 0;
+ if (size > 64 && size <= 96)
+ return 1;
+ if (size > 128 && size <= 192)
+ return 2;
+ if (size <= 8) return 3;
+ if (size <= 16) return 4;
+ if (size <= 32) return 5;
+ if (size <= 64) return 6;
+ if (size <= 128) return 7;
+ if (size <= 256) return 8;
+ if (size <= 512) return 9;
+ if (size <= 1024) return 10;
+ if (size <= 2 * 1024) return 11;
+ if (size <= 4 * 1024) return 12;
+ if (size <= 8 * 1024) return 13;
+ if (size <= 16 * 1024) return 14;
+ if (size <= 32 * 1024) return 15;
+ if (size <= 64 * 1024) return 16;
+ if (size <= 128 * 1024) return 17;
+ if (size <= 256 * 1024) return 18;
+#if KMALLOC_SHIFT_HIGH > 18
+ if (size <= 512 * 1024) return 19;
+ if (size <= 1024 * 1024) return 20;
+#endif
+#if KMALLOC_SHIFT_HIGH > 20
+ if (size <= 2 * 1024 * 1024) return 21;
+ if (size <= 4 * 1024 * 1024) return 22;
+ if (size <= 8 * 1024 * 1024) return 23;
+ if (size <= 16 * 1024 * 1024) return 24;
+ if (size <= 32 * 1024 * 1024) return 25;
+#endif
+ return -1;
+
+/*
+ * What we really wanted to do and cannot do because of compiler issues is:
+ * int i;
+ * for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++)
+ * if (size <= (1 << i))
+ * return i;
+ */
+}
+
+/*
+ * Find the slab cache for a given combination of allocation flags and size.
+ *
+ * This ought to end up with a global pointer to the right cache
+ * in kmalloc_caches.
+ */
+static inline struct kmem_cache *kmalloc_slab(size_t size)
+{
+ int index = kmalloc_index(size);
+
+ if (index == 0)
+ return NULL;
+
+ if (index < 0) {
+ /*
+ * Generate a link failure. Would be great if we could
+ * do something to stop the compile here.
+ */
+ extern void __kmalloc_size_too_large(void);
+ __kmalloc_size_too_large();
+ }
+ return &kmalloc_caches[index];
+}
+
+#ifdef CONFIG_ZONE_DMA
+#define SLUB_DMA __GFP_DMA
+#else
+/* Disable DMA functionality */
+#define SLUB_DMA 0
+#endif
+
+static inline void *kmalloc(size_t size, gfp_t flags)
+{
+ if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) {
+ struct kmem_cache *s = kmalloc_slab(size);
+
+ if (!s)
+ return NULL;
+
+ return kmem_cache_alloc(s, flags);
+ } else
+ return __kmalloc(size, flags);
+}
+
+static inline void *kzalloc(size_t size, gfp_t flags)
+{
+ if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) {
+ struct kmem_cache *s = kmalloc_slab(size);
+
+ if (!s)
+ return NULL;
+
+ return kmem_cache_zalloc(s, flags);
+ } else
+ return __kzalloc(size, flags);
+}
+
+#ifdef CONFIG_NUMA
+extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
+
+static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
+{
+ if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) {
+ struct kmem_cache *s = kmalloc_slab(size);
+
+ if (!s)
+ return NULL;
+
+ return kmem_cache_alloc_node(s, flags, node);
+ } else
+ return __kmalloc_node(size, flags, node);
+}
+#endif
+
+#endif /* _LINUX_SLUB_DEF_H */
Index: linux-2.6.21-rc5-mm3/init/Kconfig
===================================================================
--- linux-2.6.21-rc5-mm3.orig/init/Kconfig 2007-03-30 21:50:19.000000000 -0700
+++ linux-2.6.21-rc5-mm3/init/Kconfig 2007-03-30 21:50:42.000000000 -0700
@@ -496,15 +496,6 @@ config SHMEM
option replaces shmem and tmpfs with the much simpler ramfs code,
which may be appropriate on small systems without swap.
-config SLAB
- default y
- bool "Use full SLAB allocator" if (EMBEDDED && !SMP && !SPARSEMEM)
- help
- Disabling this replaces the advanced SLAB allocator and
- kmalloc support with the drastically simpler SLOB allocator.
- SLOB is more space efficient but does not scale well and is
- more susceptible to fragmentation.
-
config VM_EVENT_COUNTERS
default y
bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
@@ -514,6 +505,46 @@ config VM_EVENT_COUNTERS
on EMBEDDED systems. /proc/vmstat will only show page counts
if VM event counters are disabled.
+choice
+ prompt "Choose SLAB allocator"
+ default SLAB
+ help
+ This option allows to select a slab allocator.
+
+config SLAB
+ bool "SLAB"
+ help
+ The regular slab allocator that is established and known to work
+ well in all environments. It organizes chache hot objects in
+ per cpu and per node queues. SLAB is the default choice for
+ slab allocator.
+
+config SLUB
+ depends on EXPERIMENTAL && !ARCH_USES_SLAB_PAGE_STRUCT
+ bool "SLUB (Unqueued Allocator)"
+ help
+ SLUB is a slab allocator that minimizes cache line usage
+ instead of managing queues of cached objects (SLAB approach).
+ Per cpu caching is realized using slabs of objects instead
+ of queues of objects. SLUB can use memory efficiently
+ way and has enhanced diagnostics.
+
+config SLOB
+#
+# SLOB cannot support SMP because SLAB_DESTROY_BY_RCU does not work
+# properly.
+#
+ depends on EMBEDDED && !SMP && !SPARSEMEM
+ bool "SLOB (Simple Allocator)"
+ help
+ SLOB replaces the SLAB allocator with a drastically simpler
+ allocator. SLOB is more space efficient that SLAB but does not
+ scale well (single lock for all operations) and is more susceptible
+ to fragmentation. SLOB it is a great choice to reduce
+ memory usage and code size for embedded systems.
+
+endchoice
+
endmenu # General setup
config RT_MUTEXES
@@ -529,10 +560,6 @@ config BASE_SMALL
default 0 if BASE_FULL
default 1 if !BASE_FULL
-config SLOB
- default !SLAB
- bool
-
config PAGE_GROUP_BY_MOBILITY
bool "Group pages based on their mobility in the page allocator"
def_bool y
Index: linux-2.6.21-rc5-mm3/mm/Makefile
===================================================================
--- linux-2.6.21-rc5-mm3.orig/mm/Makefile 2007-03-30 21:50:19.000000000 -0700
+++ linux-2.6.21-rc5-mm3/mm/Makefile 2007-03-30 21:50:42.000000000 -0700
@@ -26,6 +26,7 @@ obj-$(CONFIG_TMPFS_POSIX_ACL) += shmem_a
obj-$(CONFIG_TINY_SHMEM) += tiny-shmem.o
obj-$(CONFIG_SLOB) += slob.o
obj-$(CONFIG_SLAB) += slab.o
+obj-$(CONFIG_SLUB) += slub.o
obj-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o
obj-$(CONFIG_FS_XIP) += filemap_xip.o
obj-$(CONFIG_MIGRATION) += migrate.o
Index: linux-2.6.21-rc5-mm3/mm/slub.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.21-rc5-mm3/mm/slub.c 2007-03-30 22:31:02.000000000 -0700
@@ -0,0 +1,2831 @@
+/*
+ * 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@xxxxxxx>
+ */
+
+#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
+ *
+ * SLUB assigns one slab for allocation to each processor.
+ * Allocations only occur from these slabs called cpu slabs.
+ *
+ * If a cpu slab exists then a workqueue thread checks every 10
+ * seconds if the cpu slab is still in use. The cpu slab is pushed back
+ * to the list if inactive [only needed for SMP].
+ *
+ * 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 (but we keep a counter).
+ *
+ * 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 a partial list.
+ *
+ * PageReferenced The per cpu slab was used recently. This is used
+ * to push back per cpu slabs if they are unused
+ * for a longer time period.
+ *
+ * PageError Slab requires special handling due to debug
+ * options set or a single page slab. 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.
+ *
+ * - Support DEBUG_SLAB_LEAK. Trouble is we do not know where the full
+ * slabs are in SLUB.
+ *
+ * - SLAB_DEBUG_INITIAL is not supported but I have never seen a use of
+ * it.
+ *
+ * - Variable sizing of the per node arrays
+ */
+
+/*
+ * Flags from the regular SLAB that SLUB does not support:
+ */
+#define SLUB_UNIMPLEMENTED (SLAB_DEBUG_INITIAL)
+
+#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 sizeof(void *)
+#endif
+
+#ifndef ARCH_SLAB_MINALIGN
+#define ARCH_SLAB_MINALIGN sizeof(void *)
+#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;
+
+int slab_is_available(void) {
+ return slab_state >= UP;
+}
+
+/* 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
+ *******************************************************************/
+
+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];
+
+ if (length > 128)
+ length = 128;
+ 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 */
+};
+
+struct track *get_track(struct kmem_cache *s, void *object, int 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,
+ int 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));
+}
+
+#define set_tracking(__s, __o, __a) set_track(__s, __o, __a, \
+ __builtin_return_address(0))
+
+static void init_tracking(struct kmem_cache *s, void *object)
+{
+ if (s->flags & SLAB_STORE_USER) {
+ set_track(s, object, 0, NULL);
+ set_track(s, object, 1, NULL);
+ }
+}
+
+static void print_track(const char *s, struct track *t)
+{
+#ifdef CONFIG_KALLSYMS
+ char *modname;
+ const char *name;
+ unsigned long offset, size;
+ char namebuf[KSYM_NAME_LEN + 1];
+#endif
+
+ if (!t->addr)
+ return;
+
+#ifdef CONFIG_KALLSYMS
+ name = kallsyms_lookup((unsigned long)t->addr, &size, &offset,
+ &modname, namebuf);
+
+ if (name) {
+ printk(KERN_ERR "%s: %s+%#lx/%#lx", s, name, offset, size);
+ if (modname)
+ printk(" [%s]", modname);
+ } else
+#endif
+ printk(KERN_ERR "%s: 0x%p", s, t->addr);
+ printk(" jiffies since=%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, 0));
+ print_track("Last free ", get_track(s, p, 1));
+ 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 in %s@0x%p Slab 0x%p\n",
+ reason, s->name, object, page);
+ printk(KERN_ERR " offset=%u flags=0x%04lx inuse=%u freelist=0x%p\n",
+ (int)(object - addr), page->flags, page->inuse,
+ page->freelist);
+ if (object > addr + 16)
+ print_section("Bytes b4", object - 16, 16);
+ print_section("Object", object, s->objsize);
+ print_trailer(s, object);
+ 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 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");
+ 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)) {
+ printk(KERN_ERR "SLUB: %s slab 0x%p: Padding fails check\n",
+ s->name, p);
+ print_section("Slab Pad", 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) {
+ if (!check_bytes(endobject,
+ active ? SLUB_RED_ACTIVE : SLUB_RED_INACTIVE,
+ s->inuse - s->objsize)) {
+ object_err(s, page, object,
+ active ? "Redzone Active check fails" :
+ "Redzone Inactive check fails");
+ 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");
+
+ 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");
+ return 0;
+ }
+ if (!check_pad_bytes(s, page, p))
+ return 0;
+ }
+
+ 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. This may cause
+ * another error because the object count
+ * is now wrong.
+ */
+ set_freepointer(s, p, NULL);
+ return 0;
+ }
+ return 1;
+}
+
+static int check_slab(struct kmem_cache *s, struct page *page)
+{
+ if (!PageSlab(page)) {
+ printk(KERN_CRIT "SLUB: %s Not a valid slab page @0x%p "
+ "flags=%lx mapping=0x%p count=%d \n",
+ s->name, page, page->flags, page->mapping,
+ page_count(page));
+ return 0;
+ }
+ if (page->offset * sizeof(void *) != s->offset) {
+ printk(KERN_CRIT "SLUB: %s Corrupted offset %lu in slab @0x%p"
+ " flags=0x%lx mapping=0x%p count=%d\n",
+ s->name,
+ (unsigned long)(page->offset * sizeof(void *)),
+ page,
+ page->flags,
+ page->mapping,
+ page_count(page));
+ return 0;
+ }
+ if (page->inuse > s->objects) {
+ printk(KERN_CRIT "SLUB: %s Inuse %u > max %u in slab "
+ "page @0x%p flags=%lx mapping=0x%p count=%d\n",
+ s->name, page->inuse, s->objects, page, page->flags,
+ page->mapping, page_count(page));
+ return 0;
+ }
+ return slab_pad_check(s, page);
+}
+
+/*
+ * 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 {
+ printk(KERN_ERR "SLUB: %s slab 0x%p "
+ "freepointer 0x%p corrupted.\n",
+ s->name, page, fp);
+ dump_stack();
+ page->freelist = NULL;
+ page->inuse = s->objects;
+ return 0;
+ }
+ break;
+ }
+ object = fp;
+ fp = get_freepointer(s, object);
+ nr++;
+ }
+
+ if (page->inuse != s->objects - nr) {
+ printk(KERN_CRIT "slab %s: page 0x%p wrong object count."
+ " counter is %d but counted were %d\n",
+ s->name, page, page->inuse,
+ s->objects - nr);
+ page->inuse = s->objects - nr;
+ }
+ return 0;
+}
+
+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)) {
+ printk(KERN_ERR "SLAB: %s Object 0x%p@0x%p "
+ "already allocated.\n",
+ s->name, object, page);
+ goto dump;
+ }
+
+ if (!check_valid_pointer(s, page, object)) {
+ object_err(s, page, object, "Freelist Pointer check fails");
+ goto dump;
+ }
+
+ if (!object)
+ return 1;
+
+ if (!check_object(s, page, object, 0))
+ goto bad;
+ init_object(s, object, 1);
+
+ if (s->flags & SLAB_TRACE) {
+ printk("TRACE %s alloc 0x%p inuse=%d fp=0x%p\n",
+ s->name, object, page->inuse,
+ page->freelist);
+ dump_stack();
+ }
+ return 1;
+dump:
+ dump_stack();
+bad:
+ /* Mark slab full */
+ page->inuse = s->objects;
+ page->freelist = NULL;
+ 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)) {
+ printk(KERN_ERR "SLUB: %s slab 0x%p invalid "
+ "object pointer 0x%p\n",
+ s->name, page, object);
+ goto fail;
+ }
+
+ if (on_freelist(s, page, object)) {
+ printk(KERN_CRIT "SLUB: %s slab 0x%p object "
+ "0x%p already free.\n", s->name, page, object);
+ goto fail;
+ }
+
+ if (!check_object(s, page, object, 1))
+ return 0;
+
+ if (unlikely(s != page->slab)) {
+ if (!PageSlab(page))
+ printk(KERN_CRIT "slab_free %s size %d: attempt to"
+ "free object(0x%p) outside of slab.\n",
+ s->name, s->size, object);
+ else
+ if (!page->slab)
+ printk(KERN_CRIT
+ "slab_free : no slab(NULL) for object 0x%p.\n",
+ object);
+ else
+ printk(KERN_CRIT "slab_free %s(%d): object at 0x%p"
+ " belongs to slab %s(%d)\n",
+ s->name, s->size, object,
+ page->slab->name, page->slab->size);
+ goto fail;
+ }
+ if (s->flags & SLAB_TRACE) {
+ printk("TRACE %s free 0x%p inuse=%d fp=0x%p\n",
+ s->name, object, page->inuse,
+ page->freelist);
+ print_section("Object", object, s->objsize);
+ dump_stack();
+ }
+ init_object(s, object, 0);
+ return 1;
+fail:
+ dump_stack();
+ 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 & SLUB_DMA)
+ flags |= GFP_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)) {
+ int mode = SLAB_CTOR_CONSTRUCTOR;
+
+ if (!(s->flags & __GFP_WAIT))
+ mode |= SLAB_CTOR_ATOMIC;
+
+ s->ctor(object, s, mode);
+ }
+}
+
+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;
+
+ if (flags & __GFP_NO_GROW)
+ return NULL;
+
+ 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)
+{
+#ifdef CONFIG_SMP
+ bit_spin_lock(PG_locked, &page->flags);
+#endif
+}
+
+static __always_inline void slab_unlock(struct page *page)
+{
+#ifdef CONFIG_SMP
+ bit_spin_unlock(PG_locked, &page->flags);
+#endif
+}
+
+static __always_inline int slab_trylock(struct page *page)
+{
+ int rc = 1;
+
+#ifdef CONFIG_SMP
+ rc = bit_spin_trylock(PG_locked, &page->flags);
+#endif
+ return rc;
+}
+
+/*
+ * Management of partially allocated slabs
+ */
+static void add_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);
+ n->nr_partial++;
+ list_add_tail(&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 (!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 > 2) {
+ 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)
+{
+ if (page->inuse) {
+ if (page->freelist)
+ add_partial(s, 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);
+ ClearPageReferenced(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);
+}
+
+#ifdef CONFIG_SMP
+/*
+ * Called from IPI to check and flush cpu slabs.
+ */
+static void check_flush_cpu_slab(void *private)
+{
+ struct kmem_cache *s = private;
+ int cpu = smp_processor_id();
+ struct page *page = s->cpu_slab[cpu];
+
+ if (page) {
+ if (!TestClearPageReferenced(page))
+ return;
+ flush_slab(s, page, cpu);
+ }
+ atomic_dec(&s->cpu_slabs);
+}
+
+/*
+ * Called from eventd
+ */
+static void flusher(struct work_struct *w)
+{
+ struct kmem_cache *s = container_of(w, struct kmem_cache, flush.work);
+
+ if (!mutex_trylock(&s->flushing))
+ return;
+
+ atomic_set(&s->cpu_slabs, num_online_cpus());
+ on_each_cpu(check_flush_cpu_slab, s, 1, 1);
+ if (atomic_read(&s->cpu_slabs))
+ schedule_delayed_work(&s->flush, 30 * HZ);
+ mutex_unlock(&s->flushing);
+}
+
+static void flush_all(struct kmem_cache *s)
+{
+ if (atomic_read(&s->cpu_slabs)) {
+ mutex_lock(&s->flushing);
+ cancel_delayed_work(&s->flush);
+ atomic_set(&s->cpu_slabs, 0);
+ on_each_cpu(flush_cpu_slab, s, 1, 1);
+ mutex_unlock(&s->flushing);
+ }
+}
+#else
+static void flush_all(struct kmem_cache *s)
+{
+ 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 __always_inline void *slab_alloc(struct kmem_cache *s,
+ gfp_t gfpflags, int node)
+{
+ 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];
+ SetPageReferenced(page);
+ 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);
+
+#ifdef CONFIG_SMP
+ if (!atomic_read(&s->cpu_slabs) && keventd_up()) {
+ atomic_inc(&s->cpu_slabs);
+ schedule_delayed_work(&s->flush, 30 * HZ);
+ }
+#endif
+ goto redo;
+ }
+
+ page = new_slab(s, gfpflags, node);
+ if (page) {
+ if (s->cpu_slab[cpu]) {
+ /*
+ * Someone else populated the cpu_slab while
+ * we enabled interrupts. 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_tracking(s, object, 0);
+ goto have_object;
+}
+
+void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags)
+{
+ return slab_alloc(s, gfpflags, -1);
+}
+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);
+}
+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 *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(s, page);
+
+out_unlock:
+ slab_unlock(page);
+ local_irq_restore(flags);
+ return;
+
+slab_empty:
+ if (prior)
+ /*
+ * Partially used slab that is 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 checks_ok;
+ goto out_unlock;
+}
+
+void kmem_cache_free(struct kmem_cache *s, void *x)
+{
+ struct page * page;
+
+ page = virt_to_page(x);
+
+ if (unlikely(PageCompound(page)))
+ page = page->first_page;
+
+
+ if (unlikely(PageError(page) && (s->flags & SLAB_STORE_USER)))
+ set_tracking(s, x, 1);
+ slab_free(s, page, x);
+}
+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_page(x);
+
+ if (unlikely(PageCompound(page)))
+ page = page->first_page;
+
+ 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 = 0;
+static int slub_max_order = 4;
+
+/*
+ * 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 = 8;
+
+/*
+ * Merge control. If this is set then no merging of slab caches will occur.
+ */
+static int slub_nomerge = 0;
+
+/*
+ * Debug settings:
+ */
+static int slub_debug = 0;
+
+static char *slub_debug_slabs = NULL;
+
+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;
+}
+
+static unsigned long calculate_alignment(unsigned long flags,
+ unsigned long align)
+{
+ if (flags & SLAB_HWCACHE_ALIGN)
+ return L1_CACHE_BYTES;
+
+ if (flags & SLAB_MUST_HWCACHE_ALIGN)
+ 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)
+{
+ memset(n, 0, sizeof(struct kmem_cache_node));
+ atomic_long_set(&n->nr_slabs, 0);
+ spin_lock_init(&n->list_lock);
+ INIT_LIST_HEAD(&n->partial);
+}
+
+static void free_kmem_cache_nodes(struct kmem_cache *s)
+{
+#ifdef CONFIG_NUMA
+ 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;
+ }
+#endif
+}
+
+static int init_kmem_cache_nodes(struct kmem_cache *s, gfp_t gfpflags)
+{
+#ifdef CONFIG_NUMA
+ 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) {
+ /*
+ * 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.
+ */
+ struct page *page;
+
+ BUG_ON(s->size < sizeof(struct kmem_cache_node));
+ page = new_slab(kmalloc_caches, gfpflags, node);
+
+ BUG_ON(!page);
+ n = page->freelist;
+ page->freelist = get_freepointer(kmalloc_caches, n);
+ page->inuse++;
+ } else
+ 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);
+
+ if (slab_state == DOWN)
+ atomic_long_inc(&n->nr_slabs);
+ }
+#else
+ init_kmem_cache_node(&s->local_node);
+#endif
+ return 1;
+}
+
+int calculate_sizes(struct kmem_cache *s)
+{
+ unsigned long flags = s->flags;
+ unsigned long size = s->objsize;
+ unsigned long align = s->align;
+
+ if ((flags & SLAB_POISON) && !(flags & SLAB_DESTROY_BY_RCU) &&
+ !s->ctor && !s->dtor)
+ flags |= __OBJECT_POISON;
+ else
+ flags &= ~__OBJECT_POISON;
+
+ size = ALIGN(size, sizeof(void *));
+
+ /*
+ * If we redzone then check if we have space through above
+ * alignment. If not then add an additional word, so
+ * that we have a guard value to check for overwrites.
+ */
+ if ((flags & SLAB_RED_ZONE) && size == s->objsize)
+ size += sizeof(void *);
+
+ 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)
+ size += 2 * sizeof(struct track);
+
+ align = calculate_alignment(flags, align);
+
+ size = ALIGN(size, align);
+ s->size = size;
+
+ s->order = calculate_order(size);
+ if (s->order < 0)
+ return 0;
+
+ s->objects = (PAGE_SIZE << s->order) / size;
+ if (!s->objects || s->objects > 65535)
+ return 0;
+ return 1;
+
+}
+
+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;
+
+ BUG_ON(flags & SLUB_UNIMPLEMENTED);
+
+ if (s->size >= 65535 * sizeof(void *))
+ BUG_ON(flags & (SLAB_RED_ZONE | SLAB_POISON |
+ SLAB_STORE_USER | SLAB_DESTROY_BY_RCU));
+ 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
+
+#ifdef CONFIG_SMP
+ mutex_init(&s->flushing);
+ atomic_set(&s->cpu_slabs, 0);
+ INIT_DELAYED_WORK(&s->flush, flusher);
+#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);
+
+ free_list(s, n, &n->partial);
+ if (atomic_long_read(&n->nr_slabs))
+ return 1;
+ }
+ free_kmem_cache_nodes(s);
+ return 0;
+}
+EXPORT_SYMBOL(kmem_cache_close);
+
+/*
+ * 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);
+ if (s->refcount)
+ s->refcount--;
+ else {
+ list_del(&s->list);
+ WARN_ON(kmem_cache_close(s));
+ 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_CRIT "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 (!size)
+ 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 kmem_cache_alloc(s, flags);
+ 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 kmem_cache_alloc_node(s, flags, node);
+ 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_page(x);
+
+ if (unlikely(PageCompound(page)))
+ page = page->first_page;
+
+ s = page->slab;
+
+ if (unlikely(PageError(page) && (s->flags & SLAB_STORE_USER)))
+ set_tracking(s, (void *)x, 1);
+ slab_free(s, page, (void *)x);
+}
+EXPORT_SYMBOL(kfree);
+
+/**
+ * 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_page(p);
+
+ if (unlikely(PageCompound(page)))
+ page = page->first_page;
+
+ 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 V6: General Slabs=%d, HW alignment=%d, "
+ "Processors=%d, Nodes=%d\n",
+ KMALLOC_SHIFT_HIGH, L1_CACHE_BYTES,
+ nr_cpu_ids, nr_node_ids);
+}
+
+/*
+ * Find a mergeable slab cache
+ */
+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 = ALIGN(size, align);
+
+ list_for_each(h, &slab_caches) {
+ struct kmem_cache *s =
+ container_of(h, struct kmem_cache, list);
+
+ if (size > s->size)
+ continue;
+
+ if (s->flags & SLUB_NEVER_MERGE)
+ continue;
+
+ if (s->dtor || s->ctor)
+ 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 = kmem_cache_alloc(s, flags);
+ 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
+
+/***************************************************************
+ * Compatiblility definitions
+ **************************************************************/
+
+int kmem_cache_shrink(struct kmem_cache *s)
+{
+ flush_all(s);
+ return 0;
+}
+EXPORT_SYMBOL(kmem_cache_shrink);
+
+#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
+
+/*
+ * 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);
+ void *object;
+
+ if (!s)
+ return NULL;
+
+ object = kmem_cache_alloc(s, gfpflags);
+
+ if (object && (s->flags & SLAB_STORE_USER))
+ set_track(s, object, 0, caller);
+
+ return object;
+}
+
+void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
+ int node, void *caller)
+{
+ struct kmem_cache *s = get_slab(size, gfpflags);
+ void *object;
+
+ if (!s)
+ return NULL;
+
+ object = kmem_cache_alloc_node(s, gfpflags, node);
+
+ if (object && (s->flags & SLAB_STORE_USER))
+ set_track(s, object, 0, caller);
+
+ return object;
+}
+
+#ifdef CONFIG_SYSFS
+
+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;
+
+ nodes = kmalloc(sizeof(unsigned long) * nr_node_ids, GFP_KERNEL);
+
+ for_each_online_node(node) {
+ struct kmem_cache_node *n = get_node(s, node);
+
+ nodes[node] = 0;
+
+ if (flags & SO_FULL) {
+ if (flags & SO_OBJECTS)
+ x = atomic_read(&n->nr_slabs)
+ * s->objects;
+ else
+ x = atomic_read(&n->nr_slabs);
+ total += x;
+ nodes[node] += x;
+ }
+ 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_CPU)
+ for_each_possible_cpu(cpu) {
+ struct page *page = s->cpu_slab[cpu];
+
+ if (page) {
+ int x = 0;
+ int node = page_to_nid(page);
+
+ if (flags & SO_OBJECTS)
+ x = page->inuse;
+ else
+ x = 1;
+ 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;
+ printk("_trace_store = %s\n", buf);
+ 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_MUST_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);
+
+#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,
+#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);
+
+static int sysfs_slab_add(struct kmem_cache *s)
+{
+ int err;
+
+ if (slab_state < SYSFS)
+ /* Defer until later */
+ return 0;
+
+ kobj_set_kset_s(s, slab_subsys);
+ kobject_set_name(&s->kobj, s->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);
+ 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;
+
+int sysfs_slab_alias(struct kmem_cache *s, const char *name)
+{
+ struct saved_alias *al;
+
+ if (slab_state == SYSFS)
+ return sysfs_create_link(&slab_subsys.kset.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;
+}
+
+int __init slab_sysfs_init(void)
+{
+ int err;
+ struct list_head *h;
+
+ err = subsystem_register(&slab_subsys);
+ if (err) {
+ printk(KERN_ERR "Cannot register slab subsystem.\n");
+ return -ENOSYS;
+ }
+
+ 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);
+ }
+
+ 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);
+ }
+
+ return 0;
+}
+
+__initcall(slab_sysfs_init);
+#endif
Index: linux-2.6.21-rc5-mm3/include/linux/poison.h
===================================================================
--- linux-2.6.21-rc5-mm3.orig/include/linux/poison.h 2007-03-30 21:50:18.000000000 -0700
+++ linux-2.6.21-rc5-mm3/include/linux/poison.h 2007-03-30 21:50:42.000000000 -0700
@@ -18,6 +18,9 @@
#define RED_INACTIVE 0x5A2CF071UL /* when obj is inactive */
#define RED_ACTIVE 0x170FC2A5UL /* when obj is active */
+#define SLUB_RED_INACTIVE 0xbb
+#define SLUB_RED_ACTIVE 0xcc
+
/* ...and for poisoning */
#define POISON_INUSE 0x5a /* for use-uninitialised poisoning */
#define POISON_FREE 0x6b /* for use-after-free poisoning */
Index: linux-2.6.21-rc5-mm3/arch/frv/Kconfig
===================================================================
--- linux-2.6.21-rc5-mm3.orig/arch/frv/Kconfig 2007-03-30 21:50:02.000000000 -0700
+++ linux-2.6.21-rc5-mm3/arch/frv/Kconfig 2007-03-30 21:50:42.000000000 -0700
@@ -53,6 +53,10 @@ config ARCH_HAS_ILOG2_U64
bool
default y
+config ARCH_USES_SLAB_PAGE_STRUCT
+ bool
+ default y
+
mainmenu "Fujitsu FR-V Kernel Configuration"
source "init/Kconfig"
Index: linux-2.6.21-rc5-mm3/arch/i386/Kconfig
===================================================================
--- linux-2.6.21-rc5-mm3.orig/arch/i386/Kconfig 2007-03-30 21:50:02.000000000 -0700
+++ linux-2.6.21-rc5-mm3/arch/i386/Kconfig 2007-03-30 22:30:53.000000000 -0700
@@ -79,6 +79,10 @@ config ARCH_MAY_HAVE_PC_FDC
bool
default y
+config ARCH_USES_SLAB_PAGE_STRUCT
+ bool
+ default y
+
config DMI
bool
default y
-
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