On Wed, 2011-04-20 at 11:19 +0900, KOSAKI Motohiro wrote: > > + memcpy(tmp_comm, tsk->comm_buf, TASK_COMM_LEN); > > + tsk->comm = tmp; > > /* > > - * Threads may access current->comm without holding > > - * the task lock, so write the string carefully. > > - * Readers without a lock may see incomplete new > > - * names but are safe from non-terminating string reads. > > + * Make sure no one is still looking at tsk->comm_buf > > */ > > - memset(tsk->comm, 0, TASK_COMM_LEN); > > - wmb(); > > - strlcpy(tsk->comm, buf, sizeof(tsk->comm)); > > + synchronize_rcu(); > > The doc says, > > /** > * synchronize_rcu - wait until a grace period has elapsed. Yeah, yeah... see "completely untested". :) I'll see if dropping the locks or something else equally hackish can help. -- Dave -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>