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Commit f6e7def7 authored by Christoph Lameter's avatar Christoph Lameter Committed by Pekka Enberg
Browse files

slub: Use page variable instead of c->page. 



Store the value of c->page to avoid additional fetches
from per cpu data.

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 c17dda40

mm/slub.c

+10 −7
Original line number Diff line number Diff line
@@ -2208,6 +2208,7 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, 
			  unsigned long addr, struct kmem_cache_cpu *c)

{

	void *freelist;

	struct page *page;

	unsigned long flags;



	local_irq_save(flags);
@@ -2220,13 +2221,14 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, 
	c = this_cpu_ptr(s->cpu_slab);

#endif



	if (!c->page)

	page = c->page;

	if (!page)

		goto new_slab;

redo:



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

		stat(s, ALLOC_NODE_MISMATCH);

		deactivate_slab(s, c->page, c->freelist);

		deactivate_slab(s, page, c->freelist);

		c->page = NULL;

		c->freelist = NULL;

		goto new_slab;
@@ -2239,7 +2241,7 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, 


	stat(s, ALLOC_SLOWPATH);



	freelist = get_freelist(s, c->page);

	freelist = get_freelist(s, page);



	if (!freelist) {

		c->page = NULL;
@@ -2264,8 +2266,8 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, 
new_slab:



	if (c->partial) {

		c->page = c->partial;

		c->partial = c->page->next;

		page = c->page = c->partial;

		c->partial = page->next;

		stat(s, CPU_PARTIAL_ALLOC);

		c->freelist = NULL;

		goto redo;
@@ -2281,14 +2283,15 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, 
		return NULL;

	}



	page = c->page;

	if (likely(!kmem_cache_debug(s)))

		goto load_freelist;



	/* Only entered in the debug case */

	if (!alloc_debug_processing(s, c->page, freelist, addr))

	if (!alloc_debug_processing(s, page, freelist, addr))

		goto new_slab;	/* Slab failed checks. Next slab needed */



	deactivate_slab(s, c->page, get_freepointer(s, freelist));

	deactivate_slab(s, page, get_freepointer(s, freelist));

	c->page = NULL;

	c->freelist = NULL;

	local_irq_restore(flags);