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authorChristoph Lameter <cl@linux.com>2010-08-26 09:41:19 -0500
committerPekka Enberg <penberg@kernel.org>2010-10-02 10:24:29 +0300
commitdb210e70e5f191710a3b1d09f653b44885d397ea (patch)
tree3d1472be3dfd80107090a73bf70710cdb5df21f1 /mm/slub.c
parenta016471a16b5c4d4ec8f5221575e603a3d11e5e9 (diff)
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Slub: UP bandaid
Since the percpu allocator does not provide early allocation in UP mode (only in SMP configurations) use __get_free_page() to improvise a compound page allocation that can be later freed via kfree(). Compound pages will be released when the cpu caches are resized. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/mm/slub.c b/mm/slub.c
index 4c5a76f..05674aa 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2103,8 +2103,24 @@ init_kmem_cache_node(struct kmem_cache_node *n, struct kmem_cache *s)
static inline int alloc_kmem_cache_cpus(struct kmem_cache *s)
{
+#ifdef CONFIG_SMP
+ /*
+ * Will use reserve that does not require slab operation during
+ * early boot.
+ */
BUILD_BUG_ON(PERCPU_DYNAMIC_EARLY_SIZE <
SLUB_PAGE_SHIFT * sizeof(struct kmem_cache_cpu));
+#else
+ /*
+ * Special hack for UP mode. allocpercpu() falls back to kmalloc
+ * operations. So we cannot use that before the slab allocator is up
+ * Simply get the smallest possible compound page. The page will be
+ * released via kfree() when the cpu caches are resized later.
+ */
+ if (slab_state < UP)
+ s->cpu_slab = (__percpu void *)kmalloc_large(PAGE_SIZE << 1, GFP_NOWAIT);
+ else
+#endif
s->cpu_slab = alloc_percpu(struct kmem_cache_cpu);
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