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authorChristoph Lameter <cl@linux.com>2012-07-06 15:25:11 -0500
committerPekka Enberg <penberg@kernel.org>2012-07-09 12:13:35 +0300
commit97d06609158e61f6bdf538c4a6788e2de492236f (patch)
treefa3f57ff3e2d3f4f866d84dd9d634ade43941be8 /mm/slab.h
parent039363f38bfe5f6281e9eae5e0518b11577d9d50 (diff)
downloadlinux-97d06609158e61f6bdf538c4a6788e2de492236f.tar.bz2
mm, sl[aou]b: Common definition for boot state of the slab allocators
All allocators have some sort of support for the bootstrap status. Setup a common definition for the boot states and make all slab allocators use that definition. Reviewed-by: Glauber Costa <glommer@parallels.com> Reviewed-by: Joonsoo Kim <js1304@gmail.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'mm/slab.h')
-rw-r--r--mm/slab.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/mm/slab.h b/mm/slab.h
new file mode 100644
index 000000000000..f9a9815cdc82
--- /dev/null
+++ b/mm/slab.h
@@ -0,0 +1,29 @@
+#ifndef MM_SLAB_H
+#define MM_SLAB_H
+/*
+ * Internal slab definitions
+ */
+
+/*
+ * State of the slab allocator.
+ *
+ * This is used to describe the states of the allocator during bootup.
+ * Allocators use this to gradually bootstrap themselves. Most allocators
+ * have the problem that the structures used for managing slab caches are
+ * allocated from slab caches themselves.
+ */
+enum slab_state {
+ DOWN, /* No slab functionality yet */
+ PARTIAL, /* SLUB: kmem_cache_node available */
+ PARTIAL_ARRAYCACHE, /* SLAB: kmalloc size for arraycache available */
+ PARTIAL_L3, /* SLAB: kmalloc size for l3 struct available */
+ UP, /* Slab caches usable but not all extras yet */
+ FULL /* Everything is working */
+};
+
+extern enum slab_state slab_state;
+
+struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
+ size_t align, unsigned long flags, void (*ctor)(void *));
+
+#endif