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Commit db210e70 authored by Christoph Lameter's avatar Christoph Lameter Committed by Pekka Enberg
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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: default avatarDavid Rientjes <rientjes@google.com>
Signed-off-by: default avatarChristoph Lameter <cl@linux.com>
Signed-off-by: default avatarPekka Enberg <penberg@kernel.org>
parent a016471a

mm/slub.c

+16 −0
Original line number Diff line number Diff line
@@ -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);