slub: Fallback to minimal order during slab page allocation

[linux-2.6-omap-h63xx.git] / include / linux / slub_def.h

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index a849c472b84508d31937eeea88623be6625ac904..71e43a12ebbbc62521498155d6bace9b2b0e0585 100644 (file)
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -29,6 +29,7 @@ enum stat_item {
        DEACTIVATE_TO_HEAD,     /* Cpu slab was moved to the head of partials */
        DEACTIVATE_TO_TAIL,     /* Cpu slab was moved to the tail of partials */
        DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */
+       ORDER_FALLBACK,         /* Number of times fallback was necessary */
        NR_SLUB_STAT_ITEMS };
 
 struct kmem_cache_cpu {
@@ -45,13 +46,23 @@ struct kmem_cache_cpu {
 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;
 #ifdef CONFIG_SLUB_DEBUG
+       atomic_long_t nr_slabs;
+       atomic_long_t total_objects;
        struct list_head full;
 #endif
 };
 
+/*
+ * Word size structure that can be atomically updated or read and that
+ * contains both the order and the number of objects that a slab of the
+ * given order would contain.
+ */
+struct kmem_cache_order_objects {
+       unsigned long x;
+};
+
 /*
  * Slab cache management.
  */
@@ -61,7 +72,7 @@ struct kmem_cache {
        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. */
-       int order;
+       struct kmem_cache_order_objects oo;
 
        /*
         * Avoid an extra cache line for UP, SMP and for the node local to
@@ -70,7 +81,9 @@ struct kmem_cache {
        struct kmem_cache_node local_node;
 
        /* Allocation and freeing of slabs */
-       int objects;            /* Number of objects in slab */
+       struct kmem_cache_order_objects max;
+       struct kmem_cache_order_objects min;
+       gfp_t allocflags;       /* gfp flags to use on each alloc */
        int refcount;           /* Refcount for slab cache destroy */
        void (*ctor)(struct kmem_cache *, void *);
        int inuse;              /* Offset to metadata */
@@ -110,7 +123,7 @@ struct kmem_cache {
  * 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[PAGE_SHIFT];
+extern struct kmem_cache kmalloc_caches[PAGE_SHIFT + 1];
 
 /*
  * Sorry that the following has to be that ugly but some versions of GCC
@@ -137,11 +150,11 @@ static __always_inline int kmalloc_index(size_t size)
        if (size <=        512) return 9;
        if (size <=       1024) return 10;
        if (size <=   2 * 1024) return 11;
+       if (size <=   4 * 1024) return 12;
 /*
  * The following is only needed to support architectures with a larger page
  * size than 4k.
  */
-       if (size <=   4 * 1024) return 12;
        if (size <=   8 * 1024) return 13;
        if (size <=  16 * 1024) return 14;
        if (size <=  32 * 1024) return 15;
@@ -196,7 +209,7 @@ static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
 static __always_inline void *kmalloc(size_t size, gfp_t flags)
 {
        if (__builtin_constant_p(size)) {
-               if (size > PAGE_SIZE / 2)
+               if (size > PAGE_SIZE)
                        return kmalloc_large(size, flags);
 
                if (!(flags & SLUB_DMA)) {
@@ -218,7 +231,7 @@ void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
 static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
 {
        if (__builtin_constant_p(size) &&
-               size <= PAGE_SIZE / 2 && !(flags & SLUB_DMA)) {
+               size <= PAGE_SIZE && !(flags & SLUB_DMA)) {
                        struct kmem_cache *s = kmalloc_slab(size);
 
                if (!s)