/*
- * linux/mm/slab.h
- * Written by Mark Hemment, 1996.
- * (markhe@nextd.demon.co.uk)
+ * Written by Mark Hemment, 1996 (markhe@nextd.demon.co.uk).
+ *
+ * (C) SGI 2006, Christoph Lameter <clameter@sgi.com>
+ * Cleaned up and restructured to ease the addition of alternative
+ * implementations of SLAB allocators.
*/
#ifndef _LINUX_SLAB_H
#define _LINUX_SLAB_H
-#if defined(__KERNEL__)
+#ifdef __KERNEL__
-typedef struct kmem_cache kmem_cache_t;
+#include <linux/gfp.h>
+#include <linux/types.h>
-#include <linux/config.h> /* kmalloc_sizes.h needs CONFIG_ options */
-#include <linux/gfp.h>
-#include <linux/init.h>
-#include <linux/types.h>
-#include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
-#include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
+typedef struct kmem_cache kmem_cache_t __deprecated;
-/* flags for kmem_cache_alloc() */
-#define SLAB_NOFS GFP_NOFS
-#define SLAB_NOIO GFP_NOIO
-#define SLAB_ATOMIC GFP_ATOMIC
-#define SLAB_USER GFP_USER
-#define SLAB_KERNEL GFP_KERNEL
-#define SLAB_DMA GFP_DMA
-
-#define SLAB_LEVEL_MASK GFP_LEVEL_MASK
-
-#define SLAB_NO_GROW __GFP_NO_GROW /* don't grow a cache */
+/*
+ * Flags to pass to kmem_cache_create().
+ * The ones marked DEBUG are only valid if CONFIG_SLAB_DEBUG is set.
+ */
+#define SLAB_DEBUG_FREE 0x00000100UL /* DEBUG: Perform (expensive) checks on free */
+#define SLAB_DEBUG_INITIAL 0x00000200UL /* DEBUG: Call constructor (as verifier) */
+#define SLAB_RED_ZONE 0x00000400UL /* DEBUG: Red zone objs in a cache */
+#define SLAB_POISON 0x00000800UL /* DEBUG: Poison objects */
+#define SLAB_HWCACHE_ALIGN 0x00002000UL /* Align objs on cache lines */
+#define SLAB_CACHE_DMA 0x00004000UL /* Use GFP_DMA memory */
+#define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* Force alignment even if debuggin is active */
+#define SLAB_STORE_USER 0x00010000UL /* DEBUG: Store the last owner for bug hunting */
+#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* Objects are reclaimable */
+#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 */
+
+/* Flags passed to a constructor functions */
+#define SLAB_CTOR_CONSTRUCTOR 0x001UL /* If not set, then deconstructor */
+#define SLAB_CTOR_ATOMIC 0x002UL /* Tell constructor it can't sleep */
+#define SLAB_CTOR_VERIFY 0x004UL /* Tell constructor it's a verify call */
-/* flags to pass to kmem_cache_create().
- * The first 3 are only valid when the allocator as been build
- * SLAB_DEBUG_SUPPORT.
+/*
+ * struct kmem_cache related prototypes
*/
-#define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */
-#define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */
-#define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */
-#define SLAB_POISON 0x00000800UL /* Poison objects */
-#define SLAB_NO_REAP 0x00001000UL /* never reap from the cache */
-#define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */
-#define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */
-#define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */
-#define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */
-#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate
- what is reclaimable later*/
-#define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */
-#define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */
-
-/* flags passed to a constructor func */
-#define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */
-#define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */
-#define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */
-
-#ifndef CONFIG_SLOB
-
-/* prototypes */
-extern void __init kmem_cache_init(void);
-
-extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long,
- void (*)(void *, kmem_cache_t *, unsigned long),
- void (*)(void *, kmem_cache_t *, unsigned long));
-extern int kmem_cache_destroy(kmem_cache_t *);
-extern int kmem_cache_shrink(kmem_cache_t *);
-extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t);
-extern void kmem_cache_free(kmem_cache_t *, void *);
-extern unsigned int kmem_cache_size(kmem_cache_t *);
-extern const char *kmem_cache_name(kmem_cache_t *);
-extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags);
-
-/* Size description struct for general caches. */
-struct cache_sizes {
- size_t cs_size;
- kmem_cache_t *cs_cachep;
- kmem_cache_t *cs_dmacachep;
-};
-extern struct cache_sizes malloc_sizes[];
-
-#ifndef CONFIG_DEBUG_SLAB
-extern void *__kmalloc(size_t, gfp_t);
-#else
-extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
-#define __kmalloc(size, flags) \
- __kmalloc_track_caller(size, flags, __builtin_return_address(0))
-#endif
+void __init kmem_cache_init(void);
+extern int slab_is_available(void);
+
+struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
+ unsigned long,
+ void (*)(void *, struct kmem_cache *, unsigned long),
+ void (*)(void *, struct kmem_cache *, unsigned long));
+void kmem_cache_destroy(struct kmem_cache *);
+int kmem_cache_shrink(struct kmem_cache *);
+void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
+void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
+void kmem_cache_free(struct kmem_cache *, void *);
+unsigned int kmem_cache_size(struct kmem_cache *);
+const char *kmem_cache_name(struct kmem_cache *);
+int kmem_ptr_validate(struct kmem_cache *cachep, const void *ptr);
-static inline void *kmalloc(size_t size, gfp_t flags)
+#ifdef CONFIG_NUMA
+extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
+#else
+static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
+ gfp_t flags, int node)
{
- if (__builtin_constant_p(size)) {
- int i = 0;
-#define CACHE(x) \
- if (size <= x) \
- goto found; \
- else \
- i++;
-#include "kmalloc_sizes.h"
-#undef CACHE
- {
- extern void __you_cannot_kmalloc_that_much(void);
- __you_cannot_kmalloc_that_much();
- }
-found:
- return kmem_cache_alloc((flags & GFP_DMA) ?
- malloc_sizes[i].cs_dmacachep :
- malloc_sizes[i].cs_cachep, flags);
- }
- return __kmalloc(size, flags);
+ return kmem_cache_alloc(cachep, flags);
}
+#endif
-extern void *kzalloc(size_t, gfp_t);
+/*
+ * Common kmalloc functions provided by all allocators
+ */
+void *__kmalloc(size_t, gfp_t);
+void *__kzalloc(size_t, gfp_t);
+void kfree(const void *);
+unsigned int ksize(const void *);
/**
* kcalloc - allocate memory for an array. The memory is set to zero.
*/
static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
{
- if (n != 0 && size > INT_MAX / n)
+ if (n != 0 && size > ULONG_MAX / n)
return NULL;
- return kzalloc(n * size, flags);
+ return __kzalloc(n * size, flags);
}
-extern void kfree(const void *);
-extern unsigned int ksize(const void *);
+/*
+ * Allocator specific definitions. These are mainly used to establish optimized
+ * ways to convert kmalloc() calls to kmem_cache_alloc() invocations by selecting
+ * the appropriate general cache at compile time.
+ */
-#ifdef CONFIG_NUMA
-extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node);
-extern void *kmalloc_node(size_t size, gfp_t flags, int node);
+#ifdef CONFIG_SLAB
+#include <linux/slab_def.h>
#else
-static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node)
+/*
+ * Fallback definitions for an allocator not wanting to provide
+ * its own optimized kmalloc definitions (like SLOB).
+ */
+
+/**
+ * kmalloc - allocate memory
+ * @size: how many bytes of memory are required.
+ * @flags: the type of memory to allocate.
+ *
+ * kmalloc is the normal method of allocating memory
+ * in the kernel.
+ *
+ * The @flags argument may be one of:
+ *
+ * %GFP_USER - Allocate memory on behalf of user. May sleep.
+ *
+ * %GFP_KERNEL - Allocate normal kernel ram. May sleep.
+ *
+ * %GFP_ATOMIC - Allocation will not sleep.
+ * For example, use this inside interrupt handlers.
+ *
+ * %GFP_HIGHUSER - Allocate pages from high memory.
+ *
+ * %GFP_NOIO - Do not do any I/O at all while trying to get memory.
+ *
+ * %GFP_NOFS - Do not make any fs calls while trying to get memory.
+ *
+ * Also it is possible to set different flags by OR'ing
+ * in one or more of the following additional @flags:
+ *
+ * %__GFP_COLD - Request cache-cold pages instead of
+ * trying to return cache-warm pages.
+ *
+ * %__GFP_DMA - Request memory from the DMA-capable zone.
+ *
+ * %__GFP_HIGH - This allocation has high priority and may use emergency pools.
+ *
+ * %__GFP_HIGHMEM - Allocated memory may be from highmem.
+ *
+ * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
+ * (think twice before using).
+ *
+ * %__GFP_NORETRY - If memory is not immediately available,
+ * then give up at once.
+ *
+ * %__GFP_NOWARN - If allocation fails, don't issue any warnings.
+ *
+ * %__GFP_REPEAT - If allocation fails initially, try once more before failing.
+ */
+static inline void *kmalloc(size_t size, gfp_t flags)
{
- return kmem_cache_alloc(cachep, flags);
+ return __kmalloc(size, flags);
}
-static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
+
+/**
+ * kzalloc - allocate memory. The memory is set to zero.
+ * @size: how many bytes of memory are required.
+ * @flags: the type of memory to allocate (see kmalloc).
+ */
+static inline void *kzalloc(size_t size, gfp_t flags)
{
- return kmalloc(size, flags);
+ return __kzalloc(size, flags);
}
#endif
-extern int FASTCALL(kmem_cache_reap(int));
-extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr));
-
-#else /* CONFIG_SLOB */
-
-/* SLOB allocator routines */
-
-void kmem_cache_init(void);
-struct kmem_cache *kmem_find_general_cachep(size_t, gfp_t gfpflags);
-struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t,
- unsigned long,
- void (*)(void *, struct kmem_cache *, unsigned long),
- void (*)(void *, struct kmem_cache *, unsigned long));
-int kmem_cache_destroy(struct kmem_cache *c);
-void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags);
-void kmem_cache_free(struct kmem_cache *c, void *b);
-const char *kmem_cache_name(struct kmem_cache *);
-void *kmalloc(size_t size, gfp_t flags);
-void *kzalloc(size_t size, gfp_t flags);
-void kfree(const void *m);
-unsigned int ksize(const void *m);
-unsigned int kmem_cache_size(struct kmem_cache *c);
+#ifndef CONFIG_NUMA
+static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
+{
+ return kmalloc(size, flags);
+}
-static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
+static inline void *__kmalloc_node(size_t size, gfp_t flags, int node)
{
- return kzalloc(n * size, flags);
+ return __kmalloc(size, flags);
}
+#endif /* !CONFIG_NUMA */
+
+/*
+ * kmalloc_track_caller is a special version of kmalloc that records the
+ * calling function of the routine calling it for slab leak tracking instead
+ * of just the calling function (confusing, eh?).
+ * It's useful when the call to kmalloc comes from a widely-used standard
+ * allocator where we care about the real place the memory allocation
+ * request comes from.
+ */
+#ifdef CONFIG_DEBUG_SLAB
+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))
+#else
+#define kmalloc_track_caller(size, flags) \
+ __kmalloc(size, flags)
+#endif /* DEBUG_SLAB */
-#define kmem_cache_shrink(d) (0)
-#define kmem_cache_reap(a)
-#define kmem_ptr_validate(a, b) (0)
-#define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
-#define kmalloc_node(s, f, n) kmalloc(s, f)
+#ifdef CONFIG_NUMA
+/*
+ * kmalloc_node_track_caller is a special version of kmalloc_node that
+ * records the calling function of the routine calling it for slab leak
+ * tracking instead of just the calling function (confusing, eh?).
+ * It's useful when the call to kmalloc_node comes from a widely-used
+ * standard allocator where we care about the real place the memory
+ * allocation request comes from.
+ */
+#ifdef CONFIG_DEBUG_SLAB
+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, \
+ __builtin_return_address(0))
+#else
+#define kmalloc_node_track_caller(size, flags, node) \
+ __kmalloc_node(size, flags, node)
+#endif
-#endif /* CONFIG_SLOB */
+#else /* CONFIG_NUMA */
-/* System wide caches */
-extern kmem_cache_t *vm_area_cachep;
-extern kmem_cache_t *names_cachep;
-extern kmem_cache_t *files_cachep;
-extern kmem_cache_t *filp_cachep;
-extern kmem_cache_t *fs_cachep;
-extern kmem_cache_t *signal_cachep;
-extern kmem_cache_t *sighand_cachep;
-extern kmem_cache_t *bio_cachep;
+#define kmalloc_node_track_caller(size, flags, node) \
+ kmalloc_track_caller(size, flags)
-extern atomic_t slab_reclaim_pages;
+#endif /* DEBUG_SLAB */
#endif /* __KERNEL__ */
-
#endif /* _LINUX_SLAB_H */
+
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