Separate out the submitted_mutex which is taken on each task termination

src/core/workers.h

@@ -397,6 +397,9 @@ struct _starpu_machine_config
 	/** Memory node for MPI, if only one */
 	int mpi_nodeid;
 
+	/* Separate out previous variables from per-worker data. */
+	char padding1[STARPU_CACHELINE_SIZE];
+
 	/** Basic workers : each of this worker is running its own driver and
 	 * can be combined with other basic workers. */
 	struct _starpu_worker workers[STARPU_NMAXWORKERS];
@@ -405,6 +408,11 @@ struct _starpu_machine_config
 	 * that can run parallel tasks together. */
 	struct _starpu_combined_worker combined_workers[STARPU_NMAX_COMBINEDWORKERS];
 
+	starpu_pthread_mutex_t submitted_mutex;
+
+	/* Separate out previous mutex from the rest of the data. */
+	char padding2[STARPU_CACHELINE_SIZE];
+
 	/** Translation table from bindid to worker IDs */
 	struct
 	{
@@ -440,8 +448,6 @@ struct _starpu_machine_config
 
 	/** When >0, StarPU should stop performance counters collection. */
 	int perf_counter_pause_depth;
-
-	starpu_pthread_mutex_t submitted_mutex;
 };
 
 extern int _starpu_worker_parallel_blocks;