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[PATCH] slab: make drain_array more universal by adding more parameters 

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 <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter 2006-03-22 00:09:06 -08:00 committed by Linus Torvalds
parent 35386e3b0f
commit aab2207cf8
1 changed files with 11 additions and 9 deletions
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20
mm/slab.c
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@ -2126,6 +2126,10 @@ static void check_spinlock_acquired_node(struct kmem_cache *cachep, int 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;
@ -2150,9 +2154,7 @@ static void drain_cpu_caches(struct kmem_cache *cachep)
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);
}
@ -3545,12 +3547,11 @@ static void drain_array_locked(struct kmem_cache *cachep,
* necessary.
*/
static 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);
}
}
@ -3571,6 +3572,7 @@ 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. */
@ -3593,11 +3595,11 @@ 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
@ -3608,7 +3610,7 @@ 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;