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Commit e2cb96b7 authored by Christoph Lameter's avatar Christoph Lameter Committed by Pekka Enberg
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slub: Disable NUMA remote node defragmentation by default 

Switch remote node defragmentation off by default. The current settings can
cause excessive node local allocations with hackbench:

  SLAB:

    % cat /proc/meminfo
    MemTotal:        7701760 kB
    MemFree:         5940096 kB
    Slab:             123840 kB

  SLUB:

    % cat /proc/meminfo
    MemTotal:        7701376 kB
    MemFree:         4740928 kB
    Slab:            1591680 kB

[Note: this feature is not related to slab defragmentation.]

You can find the original discussion here:

  http://lkml.org/lkml/2008/8/4/308



Reported-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Tested-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: default avatarChristoph Lameter <cl@linux-foundation.org>
Signed-off-by: default avatarPekka Enberg <penberg@cs.helsinki.fi>
parent 30a2f3c6

mm/slub.c

+2 −2
Original line number Diff line number Diff line
@@ -2312,7 +2312,7 @@ static int kmem_cache_open(struct kmem_cache *s, gfp_t gfpflags, 


	s->refcount = 1;

#ifdef CONFIG_NUMA

	s->remote_node_defrag_ratio = 100;

	s->remote_node_defrag_ratio = 1000;

#endif

	if (!init_kmem_cache_nodes(s, gfpflags & ~SLUB_DMA))

		goto error;
@@ -4058,7 +4058,7 @@ static ssize_t remote_node_defrag_ratio_store(struct kmem_cache *s, 
	if (err)

		return err;



	if (ratio < 100)

	if (ratio <= 100)

		s->remote_node_defrag_ratio = ratio * 10;



	return length;