Do not try to reuse potentially in use memory chucks only for prefetches

We were already doing it for chuncks that do not have the same data
interface, but those that have the same data interface are in the same
situation.

src/datawizard/memalloc.c

@@ -1529,9 +1529,19 @@ static starpu_ssize_t _starpu_allocate_interface(starpu_data_handle_t handle, st
 			}
 			reclaim -= freed;
 
+			if (is_prefetch)
+			{
+				/* It's just prefetch, don't bother existing allocations */
+				/* And don't bother tracing allocation attempts */
+				prefetch_out_of_memory[dst_node] = 1;
+				/* TODO: ideally we should not even try to allocate when we know we have not freed anything */
+				continue;
+			}
+
 			/* Try to reuse an allocated data with the same interface (to avoid spurious free/alloc) */
 			if (_starpu_has_not_important_data && try_to_reuse_not_important_mc(dst_node, handle, replicate, footprint, is_prefetch))
 				break;
+
 			if (try_to_reuse_potentially_in_use_mc(dst_node, handle, replicate, footprint, is_prefetch))
 			{
 				reused = 1;
@@ -1539,15 +1549,6 @@ static starpu_ssize_t _starpu_allocate_interface(starpu_data_handle_t handle, st
 				break;
 			}
 
-			if (is_prefetch)
-			{
-				/* It's just prefetch, don't bother existing allocations */
-				/* And don't bother tracing allocation attempts */
-				prefetch_out_of_memory[dst_node] = 1;
-				/* TODO: ideally we should not even try to allocate when we know we have not freed anything */
-				continue;
-			}
-
 			if (!told_reclaiming)
 			{
 				/* Prevent prefetches and such from happening */