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-rw-r--r--include/linux/mm_types.h17
-rw-r--r--include/linux/poison.h3
-rw-r--r--include/linux/slab.h14
-rw-r--r--include/linux/slub_def.h201
4 files changed, 229 insertions, 6 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index c3852fd4a1c..e30687bad07 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -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 !
*/
diff --git a/include/linux/poison.h b/include/linux/poison.h
index 89580b76495..95f518b1768 100644
--- a/include/linux/poison.h
+++ b/include/linux/poison.h
@@ -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 */
diff --git a/include/linux/slab.h b/include/linux/slab.h
index f9ed9346bfd..67425c277e1 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -32,6 +32,7 @@ typedef struct kmem_cache kmem_cache_t __deprecated;
#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 __deprecated;
* 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, size_t size, gfp_t flags)
* 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_t size, gfp_t flags, int node)
* 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_t, gfp_t, void*);
* 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, \
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
new file mode 100644
index 00000000000..30b154ce728
--- /dev/null
+++ b/include/linux/slub_def.h
@@ -0,0 +1,201 @@
+#ifndef _LINUX_SLUB_DEF_H
+#define _LINUX_SLUB_DEF_H
+
+/*
+ * SLUB : A Slab allocator without object queues.
+ *
+ * (C) 2007 SGI, Christoph Lameter <clameter@sgi.com>
+ */
+#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. */
+ 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_NUMA
+ int defrag_ratio;
+ 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 */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-21 22:30:53 +0000