slab_free        3030 mm/slub.c      	slab_free(s, virt_to_head_page(x), x, NULL, 1, _RET_IP_);
slab_free        3139 mm/slub.c      		slab_free(df.s, df.page, df.freelist, df.tail, df.cnt,_RET_IP_);
slab_free        3975 mm/slub.c      	slab_free(page->slab_cache, page, object, NULL, 1, _RET_IP_);