Commit eee05882 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Add grace-period information to RCU CPU stall warnings 



This commit causes the last grace period started and completed to be
printed on RCU CPU stall warning messages in order to aid diagnosis.

Signed-off-by: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent b637a328

kernel/rcutree.c

+5 −3
Original line number Diff line number Diff line
@@ -947,8 +947,9 @@ static void print_other_cpu_stall(struct rcu_state *rsp) 
	raw_spin_unlock_irqrestore(&rnp->lock, flags);



	print_cpu_stall_info_end();

	printk(KERN_CONT "(detected by %d, t=%ld jiffies)\n",

	       smp_processor_id(), (long)(jiffies - rsp->gp_start));

	pr_cont("(detected by %d, t=%ld jiffies, g=%lu, c=%lu)\n",

	       smp_processor_id(), (long)(jiffies - rsp->gp_start),

	       rsp->gpnum, rsp->completed);

	if (ndetected == 0)

		printk(KERN_ERR "INFO: Stall ended before state dump start\n");

	else if (!trigger_all_cpu_backtrace())
@@ -975,7 +976,8 @@ static void print_cpu_stall(struct rcu_state *rsp) 
	print_cpu_stall_info_begin();

	print_cpu_stall_info(rsp, smp_processor_id());

	print_cpu_stall_info_end();

	printk(KERN_CONT " (t=%lu jiffies)\n", jiffies - rsp->gp_start);

	pr_cont(" (t=%lu jiffies g=%lu c=%lu)\n",

		jiffies - rsp->gp_start, rsp->gpnum, rsp->completed);

	if (!trigger_all_cpu_backtrace())

		dump_stack();