This implements SLUB specific kmem_cache_free_bulk(). SLUB allocator
now both have bulk alloc and free implemented.
Play nice and reenable local IRQs while calling slowpath.
Signed-off-by: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
---
mm/slub.c | 32 +++++++++++++++++++++++++++++++-
1 file changed, 31 insertions(+), 1 deletion(-)
diff --git a/mm/slub.c b/mm/slub.c
index 98d0e6f73ec1..cc4f870677bb 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2752,7 +2752,37 @@ EXPORT_SYMBOL(kmem_cache_free);
void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p)
{
- __kmem_cache_free_bulk(s, size, p);
+ struct kmem_cache_cpu *c;
+ struct page *page;
+ int i;
+
+ local_irq_disable();
+ c = this_cpu_ptr(s->cpu_slab);
+
+ for (i = 0; i < size; i++) {
+ void *object = p[i];
+
+ if (unlikely(!object))
+ continue; // HOW ABOUT BUG_ON()???
+
+ page = virt_to_head_page(object);
+ BUG_ON(s != page->slab_cache); /* Check if valid slab page */
+
+ if (c->page == page) {
+ /* Fastpath: local CPU free */
+ set_freepointer(s, object, c->freelist);
+ c->freelist = object;
+ } else {
+ c->tid = next_tid(c->tid);
+ local_irq_enable();
+ /* Slowpath: overhead locked cmpxchg_double_slab */
+ __slab_free(s, page, object, _RET_IP_);
+ local_irq_disable();
+ c = this_cpu_ptr(s->cpu_slab);
+ }
+ }
+ c->tid = next_tid(c->tid);
+ local_irq_enable();
}
EXPORT_SYMBOL(kmem_cache_free_bulk);
--
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