From dfd0db91eec0546bc27ef562638c9fa70e76f0d7 Mon Sep 17 00:00:00 2001
From: Richard Braun <rbraun@sceen.net>
Date: Fri, 19 Apr 2013 20:09:42 +0200
Subject: kern/slab: move internal data to slab_i.h

As it's done for other modules, this separation makes the public interface
easy to identify.
---
 kern/slab.h | 133 ++----------------------------------------------------------
 1 file changed, 3 insertions(+), 130 deletions(-)

(limited to 'kern/slab.h')

diff --git a/kern/slab.h b/kern/slab.h
index 64daa61..9466f2d 100644
--- a/kern/slab.h
+++ b/kern/slab.h
@@ -48,82 +48,14 @@
 #define _KERN_SLAB_H
 
 #include <cache.h>
-#include <kern/lock.h>
-#include <kern/list.h>
 #include <mach/machine/vm_types.h>
 #include <sys/types.h>
 #include <vm/vm_types.h>
 
-#if SLAB_USE_CPU_POOLS
 /*
- * L1 cache line size.
+ * Object cache.
  */
-#define CPU_L1_SIZE (1 << CPU_L1_SHIFT)
-
-/*
- * Per-processor cache of pre-constructed objects.
- *
- * The flags member is a read-only CPU-local copy of the parent cache flags.
- */
-struct kmem_cpu_pool {
-    simple_lock_data_t lock;
-    int flags;
-    int size;
-    int transfer_size;
-    int nr_objs;
-    void **array;
-} __attribute__((aligned(CPU_L1_SIZE)));
-
-/*
- * When a cache is created, its CPU pool type is determined from the buffer
- * size. For small buffer sizes, many objects can be cached in a CPU pool.
- * Conversely, for large buffer sizes, this would incur much overhead, so only
- * a few objects are stored in a CPU pool.
- */
-struct kmem_cpu_pool_type {
-    size_t buf_size;
-    int array_size;
-    size_t array_align;
-    struct kmem_cache *array_cache;
-};
-#endif /* SLAB_USE_CPU_POOLS */
-
-/*
- * Buffer descriptor.
- *
- * For normal caches (i.e. without SLAB_CF_VERIFY), bufctls are located at the
- * end of (but inside) each buffer. If SLAB_CF_VERIFY is set, bufctls are
- * located after each buffer.
- *
- * When an object is allocated to a client, its bufctl isn't used. This memory
- * is instead used for redzoning if cache debugging is in effect.
- */
-union kmem_bufctl {
-    union kmem_bufctl *next;
-    unsigned long redzone;
-};
-
-/*
- * Buffer tag.
- *
- * This structure is only used for SLAB_CF_VERIFY caches. It is located after
- * the bufctl and includes information about the state of the buffer it
- * describes (allocated or not). It should be thought of as a debugging
- * extension of the bufctl.
- */
-struct kmem_buftag {
-    unsigned long state;
-};
-
-/*
- * Page-aligned collection of unconstructed buffers.
- */
-struct kmem_slab {
-    struct list node;
-    unsigned long nr_refs;
-    union kmem_bufctl *first_free;
-    void *addr;
-};
+struct kmem_cache;
 
 /*
  * Type for constructor functions.
@@ -145,66 +77,7 @@ typedef void (*kmem_cache_ctor_t)(void *obj);
 typedef vm_offset_t (*kmem_slab_alloc_fn_t)(vm_size_t);
 typedef void (*kmem_slab_free_fn_t)(vm_offset_t, vm_size_t);
 
-/*
- * Cache name buffer size.  The size is chosen so that struct
- * kmem_cache fits into two cache lines.  The size of a cache line on
- * a typical CPU is 64 bytes.
- */
-#define KMEM_CACHE_NAME_SIZE 24
-
-/*
- * Cache flags.
- *
- * The flags don't change once set and can be tested without locking.
- */
-#define KMEM_CF_NO_CPU_POOL     0x1 /* CPU pool layer disabled */
-#define KMEM_CF_SLAB_EXTERNAL   0x2 /* Slab data is off slab */
-#define KMEM_CF_VERIFY          0x4 /* Debugging facilities enabled */
-#define KMEM_CF_DIRECT          0x8 /* Quick buf-to-slab lookup */
-
-/*
- * Cache of objects.
- *
- * Locking order : cpu_pool -> cache. CPU pools locking is ordered by CPU ID.
- *
- * Currently, SLAB_USE_CPU_POOLS is not defined.  KMEM_CACHE_NAME_SIZE
- * is chosen so that the struct fits into two cache lines.  The first
- * cache line contains all hot fields.
- */
-struct kmem_cache {
-#if SLAB_USE_CPU_POOLS
-    /* CPU pool layer */
-    struct kmem_cpu_pool cpu_pools[NCPUS];
-    struct kmem_cpu_pool_type *cpu_pool_type;
-#endif /* SLAB_USE_CPU_POOLS */
-
-    /* Slab layer */
-    simple_lock_data_t lock;
-    struct list node;   /* Cache list linkage */
-    struct list partial_slabs;
-    struct list free_slabs;
-    int flags;
-    size_t bufctl_dist; /* Distance from buffer to bufctl   */
-    size_t slab_size;
-    unsigned long bufs_per_slab;
-    unsigned long nr_objs;  /* Number of allocated objects */
-    unsigned long nr_free_slabs;
-    kmem_cache_ctor_t ctor;
-    /* All fields below are cold  */
-    size_t obj_size;    /* User-provided size */
-    /* Assuming ! SLAB_USE_CPU_POOLS, here is the cacheline boundary */
-    size_t align;
-    size_t buf_size;    /* Aligned object size  */
-    size_t color;
-    size_t color_max;
-    unsigned long nr_bufs;  /* Total number of buffers */
-    unsigned long nr_slabs;
-    kmem_slab_alloc_fn_t slab_alloc_fn;
-    kmem_slab_free_fn_t slab_free_fn;
-    char name[KMEM_CACHE_NAME_SIZE];
-    size_t buftag_dist; /* Distance from buffer to buftag */
-    size_t redzone_pad; /* Bytes from end of object to redzone word */
-} __cacheline_aligned;
+#include <kern/slab_i.h>
 
 /*
  * Mach-style declarations for struct kmem_cache.
-- 
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