The kmalloc array is created in similar ways in both SLAB
and SLUB. Create a common function and have both allocators
call that function.
V1->V2:
Whitespace cleanup
Reviewed-by: Glauber Costa <glommer@xxxxxxxxxxxxx>
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
Index: linux/mm/slab.c
===================================================================
--- linux.orig/mm/slab.c 2012-10-24 09:52:28.381999753 -0500
+++ linux/mm/slab.c 2012-10-24 09:52:29.694018172 -0500
@@ -1611,30 +1611,6 @@ void __init kmem_cache_init(void)
slab_early_init = 0;
- for (i = 1; i < PAGE_SHIFT + MAX_ORDER; i++) {
- size_t cs_size = kmalloc_size(i);
-
- if (cs_size < KMALLOC_MIN_SIZE)
- continue;
-
- if (!kmalloc_caches[i]) {
- /*
- * For performance, all the general caches are L1 aligned.
- * This should be particularly beneficial on SMP boxes, as it
- * eliminates "false sharing".
- * Note for systems short on memory removing the alignment will
- * allow tighter packing of the smaller caches.
- */
- kmalloc_caches[i] = create_kmalloc_cache("kmalloc",
- cs_size, ARCH_KMALLOC_FLAGS);
- }
-
-#ifdef CONFIG_ZONE_DMA
- kmalloc_dma_caches[i] = create_kmalloc_cache(
- "kmalloc-dma", cs_size,
- SLAB_CACHE_DMA|ARCH_KMALLOC_FLAGS);
-#endif
- }
/* 4) Replace the bootstrap head arrays */
{
struct array_cache *ptr;
@@ -1680,29 +1656,7 @@ void __init kmem_cache_init(void)
}
}
- slab_state = UP;
-
- /* Create the proper names */
- for (i = 1; i < PAGE_SHIFT + MAX_ORDER; i++) {
- char *s;
- struct kmem_cache *c = kmalloc_caches[i];
-
- if (!c)
- continue;
-
- s = kasprintf(GFP_NOWAIT, "kmalloc-%d", kmalloc_size(i));
-
- BUG_ON(!s);
- c->name = s;
-
-#ifdef CONFIG_ZONE_DMA
- c = kmalloc_dma_caches[i];
- BUG_ON(!c);
- s = kasprintf(GFP_NOWAIT, "dma-kmalloc-%d", kmalloc_size(i));
- BUG_ON(!s);
- c->name = s;
-#endif
- }
+ create_kmalloc_caches(ARCH_KMALLOC_FLAGS);
}
void __init kmem_cache_init_late(void)
Index: linux/mm/slab.h
===================================================================
--- linux.orig/mm/slab.h 2012-10-24 09:52:17.621848696 -0500
+++ linux/mm/slab.h 2012-10-24 09:52:29.694018172 -0500
@@ -35,6 +35,12 @@ extern struct kmem_cache *kmem_cache;
unsigned long calculate_alignment(unsigned long flags,
unsigned long align, unsigned long size);
+#ifndef CONFIG_SLOB
+/* Kmalloc array related functions */
+void create_kmalloc_caches(unsigned long);
+#endif
+
+
/* Functions provided by the slab allocators */
extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags);
Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c 2012-10-24 09:52:28.381999753 -0500
+++ linux/mm/slab_common.c 2012-10-24 09:52:29.694018172 -0500
@@ -264,6 +264,60 @@ struct kmem_cache *kmalloc_dma_caches[KM
EXPORT_SYMBOL(kmalloc_dma_caches);
#endif
+/*
+ * Create the kmalloc array. Some of the regular kmalloc arrays
+ * may already have been created because they were needed to
+ * enable allocations for slab creation.
+ */
+void __init create_kmalloc_caches(unsigned long flags)
+{
+ int i;
+
+ /* Caches that are not of the two-to-the-power-of size */
+ if (KMALLOC_MIN_SIZE <= 32 && !kmalloc_caches[1])
+ kmalloc_caches[1] = create_kmalloc_cache(NULL, 96, flags);
+
+ if (KMALLOC_MIN_SIZE <= 64 && !kmalloc_caches[2])
+ kmalloc_caches[2] = create_kmalloc_cache(NULL, 192, flags);
+
+ for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++)
+ if (!kmalloc_caches[i])
+ kmalloc_caches[i] = create_kmalloc_cache(NULL,
+ 1 << i, flags);
+
+ /* Kmalloc array is now usable */
+ slab_state = UP;
+
+ for (i = 0; i <= KMALLOC_SHIFT_HIGH; i++) {
+ struct kmem_cache *s = kmalloc_caches[i];
+ char *n;
+
+ if (s) {
+ n = kasprintf(GFP_NOWAIT, "kmalloc-%d", kmalloc_size(i));
+
+ BUG_ON(!n);
+ s->name = n;
+ }
+ }
+
+#ifdef CONFIG_ZONE_DMA
+ for (i = 0; i <= KMALLOC_SHIFT_HIGH; i++) {
+ struct kmem_cache *s = kmalloc_caches[i];
+
+ if (s) {
+ int size = kmalloc_size(i);
+ char *n = kasprintf(GFP_NOWAIT,
+ "dma-kmalloc-%d", size);
+
+ BUG_ON(!n);
+ kmalloc_dma_caches[i] = create_kmalloc_cache(n,
+ size, SLAB_CACHE_DMA | flags);
+ }
+ }
+#endif
+}
+
+
#endif /* !CONFIG_SLOB */
Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c 2012-10-24 09:52:28.381999753 -0500
+++ linux/mm/slub.c 2012-10-24 09:52:29.694018172 -0500
@@ -3635,7 +3635,6 @@ static __initdata struct kmem_cache boot
void __init kmem_cache_init(void)
{
int i;
- int caches = 2;
if (debug_guardpage_minorder())
slub_max_order = 0;
@@ -3705,64 +3704,16 @@ void __init kmem_cache_init(void)
size_index[size_index_elem(i)] = 8;
}
- /* Caches that are not of the two-to-the-power-of size */
- if (KMALLOC_MIN_SIZE <= 32) {
- kmalloc_caches[1] = create_kmalloc_cache("kmalloc-96", 96, 0);
- caches++;
- }
-
- if (KMALLOC_MIN_SIZE <= 64) {
- kmalloc_caches[2] = create_kmalloc_cache("kmalloc-192", 192, 0);
- caches++;
- }
-
- for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) {
- kmalloc_caches[i] = create_kmalloc_cache("kmalloc", 1 << i, 0);
- caches++;
- }
-
- slab_state = UP;
-
- /* Provide the correct kmalloc names now that the caches are up */
- if (KMALLOC_MIN_SIZE <= 32) {
- kmalloc_caches[1]->name = kstrdup(kmalloc_caches[1]->name, GFP_NOWAIT);
- BUG_ON(!kmalloc_caches[1]->name);
- }
-
- if (KMALLOC_MIN_SIZE <= 64) {
- kmalloc_caches[2]->name = kstrdup(kmalloc_caches[2]->name, GFP_NOWAIT);
- BUG_ON(!kmalloc_caches[2]->name);
- }
-
- for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) {
- char *s = kasprintf(GFP_NOWAIT, "kmalloc-%d", 1 << i);
-
- BUG_ON(!s);
- kmalloc_caches[i]->name = s;
- }
+ create_kmalloc_caches(0);
#ifdef CONFIG_SMP
register_cpu_notifier(&slab_notifier);
#endif
-#ifdef CONFIG_ZONE_DMA
- for (i = 0; i <= KMALLOC_SHIFT_HIGH; i++) {
- struct kmem_cache *s = kmalloc_caches[i];
-
- if (s && s->size) {
- char *name = kasprintf(GFP_NOWAIT,
- "dma-kmalloc-%d", s->object_size);
-
- BUG_ON(!name);
- kmalloc_dma_caches[i] = create_kmalloc_cache(name,
- s->object_size, SLAB_CACHE_DMA);
- }
- }
-#endif
printk(KERN_INFO
- "SLUB: Genslabs=%d, HWalign=%d, Order=%d-%d, MinObjects=%d,"
+ "SLUB: HWalign=%d, Order=%d-%d, MinObjects=%d,"
" CPUs=%d, Nodes=%d\n",
- caches, cache_line_size(),
+ cache_line_size(),
slub_min_order, slub_max_order, slub_min_objects,
nr_cpu_ids, nr_node_ids);
}
--
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