static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags)
{
        int batchcount;
        struct kmem_list3 *l3;
        struct array_cache *ac;
        int node;

        node = numa_node_id();

        check_irq_off();
        ac = cpu_cache_get(cachep);
retry:
        batchcount = ac->batchcount;
        if (!ac->touched && batchcount > BATCHREFILL_LIMIT) {
                /*
                 * If there was little recent activity on this cache, then
                 * perform only a partial refill.  Otherwise we could generate
                 * refill bouncing.
                 */
                batchcount = BATCHREFILL_LIMIT;
        }
        l3 = cachep->nodelists[node];

        BUG_ON(ac->avail > 0 || !l3);
        spin_lock(&l3->list_lock);

        /* See if we can refill from the shared array */
        if (l3->shared && transfer_objects(ac, l3->shared, batchcount))
                goto alloc_done;

        while (batchcount > 0) {
                struct list_head *entry;
                struct slab *slabp;
                /* Get slab alloc is to come from. */
                entry = l3->slabs_partial.next;
                if (entry == &l3->slabs_partial) {
                        l3->free_touched = 1;
                        entry = l3->slabs_free.next;
                        if (entry == &l3->slabs_free)
                                goto must_grow;
                }

                slabp = list_entry(entry, struct slab, list);
                check_slabp(cachep, slabp);
                check_spinlock_acquired(cachep);
                while (slabp->inuse < cachep->num && batchcount--) {
                        STATS_INC_ALLOCED(cachep);
                        STATS_INC_ACTIVE(cachep);
                        STATS_SET_HIGH(cachep);

                        ac->entry[ac->avail++] = slab_get_obj(cachep, slabp,
                                                            node);
                }
                check_slabp(cachep, slabp);

                /* move slabp to correct slabp list: */
                list_del(&slabp->list);
                if (slabp->free == BUFCTL_END)
                        list_add(&slabp->list, &l3->slabs_full);
                else
                        list_add(&slabp->list, &l3->slabs_partial);
        }

must_grow:
        l3->free_objects -= ac->avail;
alloc_done:
        spin_unlock(&l3->list_lock);

        if (unlikely(!ac->avail)) {
                int x;
                x = cache_grow(cachep, flags, node);

                /* cache_grow can reenable interrupts, then ac could change. */
                ac = cpu_cache_get(cachep);
                if (!x && ac->avail == 0)       /* no objects in sight? abort */
                        return NULL;

                if (!ac->avail)         /* objects refilled by interrupt? */
                        goto retry;
        }
        ac->touched = 1;
        return ac->entry[--ac->avail];
}