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Subject[patch 03/10] SLUB: Move kmem_cache_node determination into add_full and add_partial
The kmem_cache_node determination can be moved into add_full()
and add_partial(). This removes some code from the slab_free()
slow path and reduces the register overhead that has to be managed
in the slow path.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
mm/slub.c | 29 +++++++++++++++++------------
1 file changed, 17 insertions(+), 12 deletions(-)
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2007-10-25 19:36:59.000000000 -0700
+++ linux-2.6/mm/slub.c 2007-10-25 19:37:38.000000000 -0700
@@ -800,8 +800,12 @@ static void trace(struct kmem_cache *s,
/*
* Tracking of fully allocated slabs for debugging purposes.
*/
-static void add_full(struct kmem_cache_node *n, struct page *page)
+static void add_full(struct kmem_cache *s, struct page *page)
{
+ struct kmem_cache_node *n = get_node(s, page_to_nid(page));
+
+ if (!SlabDebug(page) || !(s->flags & SLAB_STORE_USER))
+ return;
spin_lock(&n->list_lock);
list_add(&page->lru, &n->full);
spin_unlock(&n->list_lock);
@@ -1025,7 +1029,7 @@ static inline int slab_pad_check(struct
{ return 1; }
static inline int check_object(struct kmem_cache *s, struct page *page,
void *object, int active) { return 1; }
-static inline void add_full(struct kmem_cache_node *n, struct page *page) {}
+static inline void add_full(struct kmem_cache *s, struct page *page) {}
static inline unsigned long kmem_cache_flags(unsigned long objsize,
unsigned long flags, const char *name,
void (*ctor)(struct kmem_cache *, void *))
@@ -1198,9 +1202,11 @@ static __always_inline int slab_trylock(
/*
* Management of partially allocated slabs
*/
-static void add_partial(struct kmem_cache_node *n,
+static void add_partial(struct kmem_cache *s,
struct page *page, int tail)
{
+ struct kmem_cache_node *n = get_node(s, page_to_nid(page));
+
spin_lock(&n->list_lock);
n->nr_partial++;
if (tail)
@@ -1336,19 +1342,18 @@ static struct page *get_partial(struct k
*/
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));
-
ClearSlabFrozen(page);
if (page->inuse) {

if (page->freelist)
- add_partial(n, page, tail);
- else if (SlabDebug(page) && (s->flags & SLAB_STORE_USER))
- add_full(n, page);
+ add_partial(s, page, tail);
+ else
+ add_full(s, page);
slab_unlock(page);

} else {
- if (n->nr_partial < MIN_PARTIAL) {
+ if (get_node(s, page_to_nid(page))->nr_partial
+ < MIN_PARTIAL) {
/*
* Adding an empty slab to the partial slabs in order
* to avoid page allocator overhead. This slab needs
@@ -1357,7 +1362,7 @@ static void unfreeze_slab(struct kmem_ca
* partial list stays small. kmem_cache_shrink can
* reclaim empty slabs from the partial list.
*/
- add_partial(n, page, 1);
+ add_partial(s, page, 1);
slab_unlock(page);
} else {
slab_unlock(page);
@@ -1633,7 +1638,7 @@ checks_ok:
* then add it.
*/
if (unlikely(!prior))
- add_partial(get_node(s, page_to_nid(page)), page, 0);
+ add_partial(s, page, 0);

out_unlock:
slab_unlock(page);
@@ -2041,7 +2046,7 @@ static struct kmem_cache_node *early_kme
#endif
init_kmem_cache_node(n);
atomic_long_inc(&n->nr_slabs);
- add_partial(n, page, 0);
+ add_partial(kmalloc_caches, page, 0);
return n;
}

--
-
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