And a parameter to drain_array to control the freeing of all objects
and then use drain_array() to replace instances of drain_array_locked
with drain_array. Doing so will avoid taking locks in those locations
if the arrays are empty.
Signed-off-by: Christoph Lameter <[email protected]>
Index: linux-2.6.16-rc5-mm2/mm/slab.c
===================================================================
--- linux-2.6.16-rc5-mm2.orig/mm/slab.c 2006-03-03 16:14:49.000000000 -0800
+++ linux-2.6.16-rc5-mm2/mm/slab.c 2006-03-03 16:21:48.000000000 -0800
@@ -2128,6 +2128,10 @@ static void check_spinlock_acquired_node
static void drain_array_locked(struct kmem_cache *cachep,
struct array_cache *ac, int force, int node);
+static void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3,
+ struct array_cache *ac,
+ int force, int node);
+
static void do_drain(void *arg)
{
struct kmem_cache *cachep = arg;
@@ -2152,9 +2156,7 @@ static void drain_cpu_caches(struct kmem
for_each_online_node(node) {
l3 = cachep->nodelists[node];
if (l3) {
- spin_lock_irq(&l3->list_lock);
- drain_array_locked(cachep, l3->shared, 1, node);
- spin_unlock_irq(&l3->list_lock);
+ drain_array(cachep, l3, l3->shared, 1, node);
if (l3->alien)
drain_alien_cache(cachep, l3->alien);
}
@@ -3578,12 +3579,11 @@ static void drain_array_locked(struct km
* necessary.
*/
void drain_array(struct kmem_cache *searchp, struct kmem_list3 *l3,
- struct array_cache *ac)
+ struct array_cache *ac, int force, int node)
{
if (ac && ac->avail) {
spin_lock_irq(&l3->list_lock);
- drain_array_locked(searchp, ac, 0,
- numa_node_id());
+ drain_array_locked(searchp, ac, force, node);
spin_unlock_irq(&l3->list_lock);
}
}
@@ -3604,6 +3604,7 @@ static void cache_reap(void *unused)
{
struct list_head *walk;
struct kmem_list3 *l3;
+ int node = numa_node_id();
if (!mutex_trylock(&cache_chain_mutex)) {
/* Give up. Setup the next iteration. */
@@ -3626,11 +3627,11 @@ static void cache_reap(void *unused)
* have established with reasonable certainty that
* we can do some work if the lock was obtained.
*/
- l3 = searchp->nodelists[numa_node_id()];
+ l3 = searchp->nodelists[node];
reap_alien(searchp, l3);
- drain_array(searchp, l3, cpu_cache_get(searchp));
+ drain_array(searchp, l3, cpu_cache_get(searchp), 0, node);
/*
* These are racy checks but it does not matter
@@ -3641,7 +3642,7 @@ static void cache_reap(void *unused)
l3->next_reap = jiffies + REAPTIMEOUT_LIST3;
- drain_array(searchp, l3, l3->shared);
+ drain_array(searchp, l3, l3->shared, 0, node);
if (l3->free_touched) {
l3->free_touched = 0;
-
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