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rcu: Awaken grace-period kthread when stalled

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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>
This commit is contained in:
Paul E. McKenney 2015-12-31 08:48:36 -08:00
parent 274529ba9b
commit 86057b80ae
1 changed files with 3 additions and 1 deletions
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4
kernel/rcu/tree.c
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@ -1224,8 +1224,10 @@ static void rcu_check_gp_kthread_starvation(struct rcu_state *rsp)
rsp->gp_flags, rsp->gp_flags,
gp_state_getname(rsp->gp_state), rsp->gp_state, gp_state_getname(rsp->gp_state), rsp->gp_state,
rsp->gp_kthread ? rsp->gp_kthread->state : ~0); rsp->gp_kthread ? rsp->gp_kthread->state : ~0);
if (rsp->gp_kthread) if (rsp->gp_kthread) {
sched_show_task(rsp->gp_kthread); sched_show_task(rsp->gp_kthread);
wake_up_process(rsp->gp_kthread);
}
} }
} }