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[PATCH] Cleanup slab headers / API to allow easy addition of new slab allocators
This is a response to an earlier discussion on linux-mm about splitting slab.h components per allocator. Patch is against 2.6.19-git11. See http://marc.theaimsgroup.com/?l=linux-mm&m=116469577431008&w=2 This patch cleans up the slab header definitions. We define the common functions of slob and slab in slab.h and put the extra definitions needed for slab's kmalloc implementations in <linux/slab_def.h>. In order to get a greater set of common functions we add several empty functions to slob.c and also rename slob's kmalloc to __kmalloc. Slob does not need any special definitions since we introduce a fallback case. If there is no need for a slab implementation to provide its own kmalloc mess^H^H^Hacros then we simply fall back to __kmalloc functions. That is sufficient for SLOB. Sort the function in slab.h according to their functionality. First the functions operating on struct kmem_cache * then the kmalloc related functions followed by special debug and fallback definitions. Also redo a lot of comments. Signed-off-by: Christoph Lameter <clameter@sgi.com>? Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter
Linus Torvalds
parent
872225ca77
commit
2e892f43cc
@ -1,7 +1,9 @@
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/*
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* linux/include/linux/slab.h
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* Written by Mark Hemment, 1996.
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* (markhe@nextd.demon.co.uk)
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* Written by Mark Hemment, 1996 (markhe@nextd.demon.co.uk).
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*
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* (C) SGI 2006, Christoph Lameter <clameter@sgi.com>
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* Cleaned up and restructured to ease the addition of alternative
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* implementations of SLAB allocators.
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*/
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#ifndef _LINUX_SLAB_H
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@ -10,64 +12,99 @@
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#ifdef __KERNEL__
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#include <linux/gfp.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
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#include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
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#include <linux/compiler.h>
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/* kmem_cache_t exists for legacy reasons and is not used by code in mm */
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typedef struct kmem_cache kmem_cache_t __deprecated;
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/* flags to pass to kmem_cache_create().
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* The first 3 are only valid when the allocator as been build
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* SLAB_DEBUG_SUPPORT.
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/*
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* Flags to pass to kmem_cache_create().
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* The ones marked DEBUG are only valid if CONFIG_SLAB_DEBUG is set.
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*/
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#define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */
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#define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */
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#define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */
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#define SLAB_POISON 0x00000800UL /* Poison objects */
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#define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */
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#define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */
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#define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */
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#define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */
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#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate
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what is reclaimable later*/
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#define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */
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#define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */
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#define SLAB_DEBUG_FREE 0x00000100UL /* DEBUG: Perform (expensive) checks on free */
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#define SLAB_DEBUG_INITIAL 0x00000200UL /* DEBUG: Call constructor (as verifier) */
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#define SLAB_RED_ZONE 0x00000400UL /* DEBUG: Red zone objs in a cache */
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#define SLAB_POISON 0x00000800UL /* DEBUG: Poison objects */
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#define SLAB_HWCACHE_ALIGN 0x00002000UL /* Align objs on cache lines */
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#define SLAB_CACHE_DMA 0x00004000UL /* Use GFP_DMA memory */
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#define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* Force alignment even if debuggin is active */
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#define SLAB_STORE_USER 0x00010000UL /* DEBUG: Store the last owner for bug hunting */
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#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* Objects are reclaimable */
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#define SLAB_PANIC 0x00040000UL /* Panic if kmem_cache_create() fails */
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#define SLAB_DESTROY_BY_RCU 0x00080000UL /* Defer freeing slabs to RCU */
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#define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
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/* flags passed to a constructor func */
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#define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */
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#define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */
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#define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */
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/* Flags passed to a constructor functions */
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#define SLAB_CTOR_CONSTRUCTOR 0x001UL /* If not set, then deconstructor */
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#define SLAB_CTOR_ATOMIC 0x002UL /* Tell constructor it can't sleep */
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#define SLAB_CTOR_VERIFY 0x004UL /* Tell constructor it's a verify call */
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#ifndef CONFIG_SLOB
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/*
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* struct kmem_cache related prototypes
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*/
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void __init kmem_cache_init(void);
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extern int slab_is_available(void);
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/* prototypes */
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extern void __init kmem_cache_init(void);
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extern struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
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struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
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unsigned long,
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void (*)(void *, struct kmem_cache *, unsigned long),
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void (*)(void *, struct kmem_cache *, unsigned long));
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extern void kmem_cache_destroy(struct kmem_cache *);
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extern int kmem_cache_shrink(struct kmem_cache *);
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extern void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
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extern void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
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extern void kmem_cache_free(struct kmem_cache *, void *);
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extern unsigned int kmem_cache_size(struct kmem_cache *);
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extern const char *kmem_cache_name(struct kmem_cache *);
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void kmem_cache_destroy(struct kmem_cache *);
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int kmem_cache_shrink(struct kmem_cache *);
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void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
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void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
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void kmem_cache_free(struct kmem_cache *, void *);
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unsigned int kmem_cache_size(struct kmem_cache *);
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const char *kmem_cache_name(struct kmem_cache *);
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int kmem_ptr_validate(struct kmem_cache *cachep, void *ptr);
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/* Size description struct for general caches. */
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struct cache_sizes {
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size_t cs_size;
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struct kmem_cache *cs_cachep;
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struct kmem_cache *cs_dmacachep;
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};
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extern struct cache_sizes malloc_sizes[];
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#ifdef CONFIG_NUMA
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extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
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#else
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static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
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gfp_t flags, int node)
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{
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return kmem_cache_alloc(cachep, flags);
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}
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#endif
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extern void *__kmalloc(size_t, gfp_t);
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/*
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* Common kmalloc functions provided by all allocators
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*/
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void *__kmalloc(size_t, gfp_t);
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void *__kzalloc(size_t, gfp_t);
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void kfree(const void *);
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unsigned int ksize(const void *);
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/**
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* kcalloc - allocate memory for an array. The memory is set to zero.
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* @n: number of elements.
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* @size: element size.
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* @flags: the type of memory to allocate.
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*/
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static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
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{
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if (n != 0 && size > ULONG_MAX / n)
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return NULL;
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return __kzalloc(n * size, flags);
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}
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/*
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* Allocator specific definitions. These are mainly used to establish optimized
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* ways to convert kmalloc() calls to kmem_cache_alloc() invocations by selecting
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* the appropriate general cache at compile time.
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*/
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#ifdef CONFIG_SLAB
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#include <linux/slab_def.h>
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#else
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/*
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* Fallback definitions for an allocator not wanting to provide
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* its own optimized kmalloc definitions (like SLOB).
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*/
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#if defined(CONFIG_NUMA) || defined(CONFIG_DEBUG_SLAB)
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#error "SLAB fallback definitions not usable for NUMA or Slab debug"
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#endif
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/**
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* kmalloc - allocate memory
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@ -114,29 +151,22 @@ extern void *__kmalloc(size_t, gfp_t);
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*
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* %__GFP_REPEAT - If allocation fails initially, try once more before failing.
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*/
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static inline void *kmalloc(size_t size, gfp_t flags)
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void *kmalloc(size_t size, gfp_t flags)
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{
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if (__builtin_constant_p(size)) {
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int i = 0;
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#define CACHE(x) \
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if (size <= x) \
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goto found; \
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else \
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i++;
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#include "kmalloc_sizes.h"
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#undef CACHE
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{
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extern void __you_cannot_kmalloc_that_much(void);
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__you_cannot_kmalloc_that_much();
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}
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found:
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return kmem_cache_alloc((flags & GFP_DMA) ?
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malloc_sizes[i].cs_dmacachep :
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malloc_sizes[i].cs_cachep, flags);
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}
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return __kmalloc(size, flags);
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}
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/**
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* kzalloc - allocate memory. The memory is set to zero.
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* @size: how many bytes of memory are required.
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* @flags: the type of memory to allocate (see kmalloc).
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*/
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void *kzalloc(size_t size, gfp_t flags)
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{
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return __kzalloc(size, flags);
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}
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#endif
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/*
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* kmalloc_track_caller is a special version of kmalloc that records the
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* calling function of the routine calling it for slab leak tracking instead
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@ -145,89 +175,16 @@ static inline void *kmalloc(size_t size, gfp_t flags)
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* allocator where we care about the real place the memory allocation
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* request comes from.
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*/
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#ifndef CONFIG_DEBUG_SLAB
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#define kmalloc_track_caller(size, flags) \
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__kmalloc(size, flags)
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#else
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#ifdef CONFIG_DEBUG_SLAB
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extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
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#define kmalloc_track_caller(size, flags) \
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__kmalloc_track_caller(size, flags, __builtin_return_address(0))
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#endif
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extern void *__kzalloc(size_t, gfp_t);
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/**
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* kzalloc - allocate memory. The memory is set to zero.
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* @size: how many bytes of memory are required.
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* @flags: the type of memory to allocate (see kmalloc).
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*/
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static inline void *kzalloc(size_t size, gfp_t flags)
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{
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if (__builtin_constant_p(size)) {
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int i = 0;
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#define CACHE(x) \
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if (size <= x) \
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goto found; \
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else \
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i++;
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#include "kmalloc_sizes.h"
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#undef CACHE
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{
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extern void __you_cannot_kzalloc_that_much(void);
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__you_cannot_kzalloc_that_much();
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}
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found:
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return kmem_cache_zalloc((flags & GFP_DMA) ?
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malloc_sizes[i].cs_dmacachep :
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malloc_sizes[i].cs_cachep, flags);
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}
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return __kzalloc(size, flags);
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}
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/**
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* kcalloc - allocate memory for an array. The memory is set to zero.
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* @n: number of elements.
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* @size: element size.
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* @flags: the type of memory to allocate.
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*/
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static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
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{
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if (n != 0 && size > ULONG_MAX / n)
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return NULL;
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return kzalloc(n * size, flags);
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}
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extern void kfree(const void *);
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extern unsigned int ksize(const void *);
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extern int slab_is_available(void);
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#else
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#define kmalloc_track_caller(size, flags) \
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__kmalloc(size, flags)
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#endif /* DEBUG_SLAB */
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#ifdef CONFIG_NUMA
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extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
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extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
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static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
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{
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if (__builtin_constant_p(size)) {
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int i = 0;
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#define CACHE(x) \
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if (size <= x) \
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goto found; \
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else \
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i++;
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#include "kmalloc_sizes.h"
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#undef CACHE
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{
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extern void __you_cannot_kmalloc_that_much(void);
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__you_cannot_kmalloc_that_much();
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}
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found:
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return kmem_cache_alloc_node((flags & GFP_DMA) ?
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malloc_sizes[i].cs_dmacachep :
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malloc_sizes[i].cs_cachep, flags, node);
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}
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return __kmalloc_node(size, flags, node);
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}
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/*
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* kmalloc_node_track_caller is a special version of kmalloc_node that
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* records the calling function of the routine calling it for slab leak
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@ -236,70 +193,27 @@ static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
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* standard allocator where we care about the real place the memory
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* allocation request comes from.
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*/
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#ifndef CONFIG_DEBUG_SLAB
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#define kmalloc_node_track_caller(size, flags, node) \
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__kmalloc_node(size, flags, node)
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#else
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#ifdef CONFIG_DEBUG_SLAB
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extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, void *);
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#define kmalloc_node_track_caller(size, flags, node) \
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__kmalloc_node_track_caller(size, flags, node, \
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__builtin_return_address(0))
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#else
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#define kmalloc_node_track_caller(size, flags, node) \
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__kmalloc_node(size, flags, node)
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#endif
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#else /* CONFIG_NUMA */
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static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
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gfp_t flags, int node)
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{
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return kmem_cache_alloc(cachep, flags);
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}
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#define kmalloc_node_track_caller(size, flags, node) \
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kmalloc_track_caller(size, flags)
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static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
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{
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return kmalloc(size, flags);
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}
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#define kmalloc_node_track_caller(size, flags, node) \
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kmalloc_track_caller(size, flags)
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#endif
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extern int FASTCALL(kmem_cache_reap(int));
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extern int FASTCALL(kmem_ptr_validate(struct kmem_cache *cachep, void *ptr));
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#else /* CONFIG_SLOB */
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/* SLOB allocator routines */
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void kmem_cache_init(void);
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struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t,
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unsigned long,
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void (*)(void *, struct kmem_cache *, unsigned long),
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void (*)(void *, struct kmem_cache *, unsigned long));
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void kmem_cache_destroy(struct kmem_cache *c);
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void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags);
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void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
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void kmem_cache_free(struct kmem_cache *c, void *b);
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const char *kmem_cache_name(struct kmem_cache *);
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void *kmalloc(size_t size, gfp_t flags);
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void *__kzalloc(size_t size, gfp_t flags);
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void kfree(const void *m);
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unsigned int ksize(const void *m);
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unsigned int kmem_cache_size(struct kmem_cache *c);
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static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
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{
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return __kzalloc(n * size, flags);
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}
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#define kmem_cache_shrink(d) (0)
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#define kmem_cache_reap(a)
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#define kmem_ptr_validate(a, b) (0)
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#define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
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#define kmalloc_node(s, f, n) kmalloc(s, f)
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#define kzalloc(s, f) __kzalloc(s, f)
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#define kmalloc_track_caller kmalloc
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#define kmalloc_node_track_caller kmalloc_node
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#endif /* CONFIG_SLOB */
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#endif /* !CONFIG_NUMA */
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#endif /* __KERNEL__ */
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#endif /* _LINUX_SLAB_H */
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100
include/linux/slab_def.h
Normal file
100
include/linux/slab_def.h
Normal file
@ -0,0 +1,100 @@
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#ifndef _LINUX_SLAB_DEF_H
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#define _LINUX_SLAB_DEF_H
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/*
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* Definitions unique to the original Linux SLAB allocator.
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*
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* What we provide here is a way to optimize the frequent kmalloc
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* calls in the kernel by selecting the appropriate general cache
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* if kmalloc was called with a size that can be established at
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* compile time.
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*/
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#include <linux/init.h>
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#include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
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#include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
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#include <linux/compiler.h>
|
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|
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/* Size description struct for general caches. */
|
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struct cache_sizes {
|
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size_t cs_size;
|
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struct kmem_cache *cs_cachep;
|
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struct kmem_cache *cs_dmacachep;
|
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};
|
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extern struct cache_sizes malloc_sizes[];
|
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|
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static inline void *kmalloc(size_t size, gfp_t flags)
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{
|
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if (__builtin_constant_p(size)) {
|
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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);
|
||||
}
|
||||
|
||||
static inline void *kzalloc(size_t size, gfp_t flags)
|
||||
{
|
||||
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_kzalloc_that_much(void);
|
||||
__you_cannot_kzalloc_that_much();
|
||||
}
|
||||
found:
|
||||
return kmem_cache_zalloc((flags & GFP_DMA) ?
|
||||
malloc_sizes[i].cs_dmacachep :
|
||||
malloc_sizes[i].cs_cachep, flags);
|
||||
}
|
||||
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)) {
|
||||
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_node((flags & GFP_DMA) ?
|
||||
malloc_sizes[i].cs_dmacachep :
|
||||
malloc_sizes[i].cs_cachep, flags, node);
|
||||
}
|
||||
return __kmalloc_node(size, flags, node);
|
||||
}
|
||||
|
||||
#endif /* CONFIG_NUMA */
|
||||
|
||||
#endif /* _LINUX_SLAB_DEF_H */
|
||||
16
mm/slob.c
16
mm/slob.c
@ -157,7 +157,7 @@ static int fastcall find_order(int size)
|
||||
return order;
|
||||
}
|
||||
|
||||
void *kmalloc(size_t size, gfp_t gfp)
|
||||
void *__kmalloc(size_t size, gfp_t gfp)
|
||||
{
|
||||
slob_t *m;
|
||||
bigblock_t *bb;
|
||||
@ -186,8 +186,7 @@ void *kmalloc(size_t size, gfp_t gfp)
|
||||
slob_free(bb, sizeof(bigblock_t));
|
||||
return 0;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(kmalloc);
|
||||
EXPORT_SYMBOL(__kmalloc);
|
||||
|
||||
void kfree(const void *block)
|
||||
{
|
||||
@ -329,6 +328,17 @@ EXPORT_SYMBOL(kmem_cache_name);
|
||||
static struct timer_list slob_timer = TIMER_INITIALIZER(
|
||||
(void (*)(unsigned long))kmem_cache_init, 0, 0);
|
||||
|
||||
int kmem_cache_shrink(struct kmem_cache *d)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(kmem_cache_shrink);
|
||||
|
||||
int kmem_ptr_validate(struct kmem_cache *a, void *b)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
void kmem_cache_init(void)
|
||||
{
|
||||
void *p = slob_alloc(PAGE_SIZE, 0, PAGE_SIZE-1);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user