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: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
diff --git a/mm/slub.c b/mm/slub.c
index 30d2dde..bddae72 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -217,10 +217,10 @@
#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 @@
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 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 @@
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 @@
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 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 @@
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 @@
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 = 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 @@
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 @@
else {
c->freelist = get_freepointer(s, object);
- stat(c, ALLOC_FASTPATH);
+ stat(s, ALLOC_FASTPATH);
}
local_irq_restore(flags);
@@ -1780,10 +1779,8 @@
{
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 @@
page->inuse--;
if (unlikely(PageSlubFrozen(page))) {
- stat(c, FREE_FROZEN);
+ stat(s, FREE_FROZEN);
goto out_unlock;
}
@@ -1809,7 +1806,7 @@
*/
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 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 @@
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);