An performance tweak (I guess): perform the cross-CPU cache reclaim
operation outside the global semaphore.  Needs more explanation.


=====================================

--- 2.4.19-pre4/mm/slab.c~aa-170-drain_cpu_caches	Tue Mar 26 23:11:35 2002
+++ 2.4.19-pre4-akpm/mm/slab.c	Tue Mar 26 23:11:35 2002
@@ -916,8 +916,6 @@ static int __kmem_cache_shrink(kmem_cach
 	slab_t *slabp;
 	int ret;
 
-	drain_cpu_caches(cachep);
-
 	spin_lock_irq(&cachep->spinlock);
 
 	/* If the cache is growing, stop shrinking. */
@@ -988,6 +986,8 @@ int kmem_cache_destroy (kmem_cache_t * c
 	list_del(&cachep->next);
 	up(&cache_chain_sem);
 
+	drain_cpu_caches(cachep);
+
 	if (__kmem_cache_shrink(cachep)) {
 		printk(KERN_ERR "kmem_cache_destroy: Can't free all objects %p\n",
 		       cachep);