Commit e36a2652 authored by Christoph Lameter's avatar Christoph Lameter Committed by Pekka Enberg
Browse files

slub: Add statistics for the case that the current slab does not match the node 



Slub reloads the per cpu slab if the page does not satisfy the NUMA condition. Track
those reloads since doing so has a performance impact.

Signed-off-by: default avatarChristoph Lameter <cl@linux.com>
Signed-off-by: default avatarPekka Enberg <penberg@kernel.org>
parent fc59c053

include/linux/slub_def.h

+1 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ enum stat_item { 
	ALLOC_FROM_PARTIAL,	/* Cpu slab acquired from partial list */

	ALLOC_SLAB,		/* Cpu slab acquired from page allocator */

	ALLOC_REFILL,		/* Refill cpu slab from slab freelist */

	ALLOC_NODE_MISMATCH,	/* Switching cpu slab */

	FREE_SLAB,		/* Slab freed to the page allocator */

	CPUSLAB_FLUSH,		/* Abandoning of the cpu slab */

	DEACTIVATE_FULL,	/* Cpu slab was full when deactivated */

mm/slub.c

+3 −0
Original line number Diff line number Diff line
@@ -1966,6 +1966,7 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, 
		goto new_slab;



	if (unlikely(!node_match(c, node))) {

		stat(s, ALLOC_NODE_MISMATCH);

		deactivate_slab(s, c);

		goto new_slab;

	}
@@ -4671,6 +4672,7 @@ STAT_ATTR(FREE_REMOVE_PARTIAL, free_remove_partial); 
STAT_ATTR(ALLOC_FROM_PARTIAL, alloc_from_partial);

STAT_ATTR(ALLOC_SLAB, alloc_slab);

STAT_ATTR(ALLOC_REFILL, alloc_refill);

STAT_ATTR(ALLOC_NODE_MISMATCH, alloc_node_mismatch);

STAT_ATTR(FREE_SLAB, free_slab);

STAT_ATTR(CPUSLAB_FLUSH, cpuslab_flush);

STAT_ATTR(DEACTIVATE_FULL, deactivate_full);
@@ -4730,6 +4732,7 @@ static struct attribute *slab_attrs[] = { 
	&alloc_from_partial_attr.attr,

	&alloc_slab_attr.attr,

	&alloc_refill_attr.attr,

	&alloc_node_mismatch_attr.attr,

	&free_slab_attr.attr,

	&cpuslab_flush_attr.attr,

	&deactivate_full_attr.attr,