rcu: Awaken grace-period kthread when stalled



Recent kernels can fail to awaken the grace-period kthread for
quiescent-state forcing.  This commit is a crude hack that does
a wakeup any time a stall is detected.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

parent 274529ba

kernel/rcu/tree.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -1224,8 +1224,10 @@ static void rcu_check_gp_kthread_starvation(struct rcu_state *rsp)
		rsp->gp_flags,
		gp_state_getname(rsp->gp_state), rsp->gp_state,
		rsp->gp_kthread ? rsp->gp_kthread->state : ~0);
		if (rsp->gp_kthread)
		if (rsp->gp_kthread) {
		sched_show_task(rsp->gp_kthread);
		wake_up_process(rsp->gp_kthread);
		}
		}
		}