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rcu: Make RCU_CPU_STALL_INFO include number of fqs attempts

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One way that an RCU CPU stall warning can happen is if the grace-period
kthread is not allowed to execute.  One proxy for this kthread's
forward progress is the number of force-quiescent-state (fqs) scans.
This commit therefore adds the number of fqs scans to the RCU CPU stall
warning printouts when CONFIG_RCU_CPU_STALL_INFO=y.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2014-12-08 09:57:48 -08:00
parent e9408e4f27
commit fc908ed33e
3 changed files with 5 additions and 1 deletions
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kernel/rcu/tree.c
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@@ -1043,6 +1043,7 @@ static void record_gp_stall_check_time(struct rcu_state *rsp)
j1 = rcu_jiffies_till_stall_check();
ACCESS_ONCE(rsp->jiffies_stall) = j + j1;
rsp->jiffies_resched = j + j1 / 2;
rsp->n_force_qs_gpstart = ACCESS_ONCE(rsp->n_force_qs);
}
/*