Commit 84e554e6 authored by Christoph Lameter's avatar Christoph Lameter Committed by Pekka Enberg
Browse files

SLUB: Make slub statistics use this_cpu_inc 



this_cpu_inc() translates into a single instruction on x86 and does not
need any register. So use it in stat(). We also want to avoid the
calculation of the per cpu kmem_cache_cpu structure pointer. So pass
a kmem_cache pointer instead of a kmem_cache_cpu pointer.

Signed-off-by: default avatarChristoph Lameter <cl@linux-foundation.org>
Signed-off-by: default avatarPekka Enberg <penberg@cs.helsinki.fi>
parent ff12059e

mm/slub.c

+20 −23
Original line number Diff line number Diff line
@@ -217,10 +217,10 @@ static inline void sysfs_slab_remove(struct kmem_cache *s) 


#endif



static inline void stat(struct kmem_cache_cpu *c, enum stat_item si)

static inline void stat(struct kmem_cache *s, enum stat_item si)

{

#ifdef CONFIG_SLUB_STATS

	c->stat[si]++;

	__this_cpu_inc(s->cpu_slab->stat[si]);

#endif

}
@@ -1108,7 +1108,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) 
		if (!page)

			return NULL;



		stat(this_cpu_ptr(s->cpu_slab), ORDER_FALLBACK);

		stat(s, ORDER_FALLBACK);

	}



	if (kmemcheck_enabled
@@ -1406,23 +1406,22 @@ static struct page *get_partial(struct kmem_cache *s, gfp_t flags, int node) 
static void unfreeze_slab(struct kmem_cache *s, struct page *page, int tail)

{

	struct kmem_cache_node *n = get_node(s, page_to_nid(page));

	struct kmem_cache_cpu *c = this_cpu_ptr(s->cpu_slab);



	__ClearPageSlubFrozen(page);

	if (page->inuse) {



		if (page->freelist) {

			add_partial(n, page, tail);

			stat(c, tail ? DEACTIVATE_TO_TAIL : DEACTIVATE_TO_HEAD);

			stat(s, tail ? DEACTIVATE_TO_TAIL : DEACTIVATE_TO_HEAD);

		} else {

			stat(c, DEACTIVATE_FULL);

			stat(s, DEACTIVATE_FULL);

			if (SLABDEBUG && PageSlubDebug(page) &&

						(s->flags & SLAB_STORE_USER))

				add_full(n, page);

		}

		slab_unlock(page);

	} else {

		stat(c, DEACTIVATE_EMPTY);

		stat(s, DEACTIVATE_EMPTY);

		if (n->nr_partial < s->min_partial) {

			/*

			 * Adding an empty slab to the partial slabs in order
@@ -1438,7 +1437,7 @@ static void unfreeze_slab(struct kmem_cache *s, struct page *page, int tail) 
			slab_unlock(page);

		} else {

			slab_unlock(page);

			stat(__this_cpu_ptr(s->cpu_slab), FREE_SLAB);

			stat(s, FREE_SLAB);

			discard_slab(s, page);

		}

	}
@@ -1453,7 +1452,7 @@ static void deactivate_slab(struct kmem_cache *s, struct kmem_cache_cpu *c) 
	int tail = 1;



	if (page->freelist)

		stat(c, DEACTIVATE_REMOTE_FREES);

		stat(s, DEACTIVATE_REMOTE_FREES);

	/*

	 * Merge cpu freelist into slab freelist. Typically we get here

	 * because both freelists are empty. So this is unlikely
@@ -1479,7 +1478,7 @@ static void deactivate_slab(struct kmem_cache *s, struct kmem_cache_cpu *c) 


static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)

{

	stat(c, CPUSLAB_FLUSH);

	stat(s, CPUSLAB_FLUSH);

	slab_lock(c->page);

	deactivate_slab(s, c);

}
@@ -1619,7 +1618,7 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, 
	if (unlikely(!node_match(c, node)))

		goto another_slab;



	stat(c, ALLOC_REFILL);

	stat(s, ALLOC_REFILL);



load_freelist:

	object = c->page->freelist;
@@ -1634,7 +1633,7 @@ load_freelist: 
	c->node = page_to_nid(c->page);

unlock_out:

	slab_unlock(c->page);

	stat(c, ALLOC_SLOWPATH);

	stat(s, ALLOC_SLOWPATH);

	return object;



another_slab:
@@ -1644,7 +1643,7 @@ new_slab: 
	new = get_partial(s, gfpflags, node);

	if (new) {

		c->page = new;

		stat(c, ALLOC_FROM_PARTIAL);

		stat(s, ALLOC_FROM_PARTIAL);

		goto load_freelist;

	}
@@ -1658,7 +1657,7 @@ new_slab: 


	if (new) {

		c = __this_cpu_ptr(s->cpu_slab);

		stat(c, ALLOC_SLAB);

		stat(s, ALLOC_SLAB);

		if (c->page)

			flush_slab(s, c);

		slab_lock(new);
@@ -1713,7 +1712,7 @@ static __always_inline void *slab_alloc(struct kmem_cache *s, 


	else {

		c->freelist = get_freepointer(s, object);

		stat(c, ALLOC_FASTPATH);

		stat(s, ALLOC_FASTPATH);

	}

	local_irq_restore(flags);
@@ -1780,10 +1779,8 @@ static void __slab_free(struct kmem_cache *s, struct page *page, 
{

	void *prior;

	void **object = (void *)x;

	struct kmem_cache_cpu *c;



	c = __this_cpu_ptr(s->cpu_slab);

	stat(c, FREE_SLOWPATH);

	stat(s, FREE_SLOWPATH);

	slab_lock(page);



	if (unlikely(SLABDEBUG && PageSlubDebug(page)))
@@ -1796,7 +1793,7 @@ checks_ok: 
	page->inuse--;



	if (unlikely(PageSlubFrozen(page))) {

		stat(c, FREE_FROZEN);

		stat(s, FREE_FROZEN);

		goto out_unlock;

	}
@@ -1809,7 +1806,7 @@ checks_ok: 
	 */

	if (unlikely(!prior)) {

		add_partial(get_node(s, page_to_nid(page)), page, 1);

		stat(c, FREE_ADD_PARTIAL);

		stat(s, FREE_ADD_PARTIAL);

	}



out_unlock:
@@ -1822,10 +1819,10 @@ slab_empty: 
		 * Slab still on the partial list.

		 */

		remove_partial(s, page);

		stat(c, FREE_REMOVE_PARTIAL);

		stat(s, FREE_REMOVE_PARTIAL);

	}

	slab_unlock(page);

	stat(c, FREE_SLAB);

	stat(s, FREE_SLAB);

	discard_slab(s, page);

	return;
@@ -1863,7 +1860,7 @@ static __always_inline void slab_free(struct kmem_cache *s, 
	if (likely(page == c->page && c->node >= 0)) {

		set_freepointer(s, object, c->freelist);

		c->freelist = object;

		stat(c, FREE_FASTPATH);

		stat(s, FREE_FASTPATH);

	} else

		__slab_free(s, page, x, addr);

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