[PATCH] slab: reduce fragmentation due to kmem_cache_alloc_node

Attached is a patch that fixes the fragmentation that Badri noticed with
kmem_cache_alloc_node.

kmem_cache_alloc_node tries to allocate memory from a given node. The
current implementation contains two bugs:

- the node aware code was used even for !CONFIG_NUMA systems.  Fix:
  inline function that redefines kmem_cache_alloc_node as kmem_cache_alloc
  for !CONFIG_NUMA.

- the code always allocated a new slab for each new allocation.  This
  caused severe fragmentation.  Fix: walk the slabp lists and search for a
  matching page instead of allocating a new page.

- the patch also adds a new statistics field for node-local allocs.  They
  should be rare - the codepath is quite slow, especially compared to the
  normal kmem_cache_alloc.

Signed-Off-By: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

0 files changed, 0 insertions, 0 deletions