Kmem cache zalloc

http://lxr.free-electrons.com/source/include/linux/slab.h#L628

625 /*
626  * Shortcuts
627  */
628 static inline void *kmem_cache_zalloc(struct kmem_cache *k, gfp_t flags)
629 {
630         return kmem_cache_alloc(k, flags | __GFP_ZERO);  //GFP_ZERO is return zeroed page on success
631 }