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Commit bf1304e9 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Paul E. McKenney
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rcu: Dump only the current CPU's buffers for idle-entry/exit warnings 



Problems in RCU idle entry and exit are almost always confined to the
offending CPU.  This commit therefore switches ftrace_dump() from
DUMP_ALL to DUMP_ORIG.

Signed-off-by: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Tested-by: default avatarPascal Chapperon <pascal.chapperon@wanadoo.fr>
parent cba6d0d6

kernel/rcutree.c

+2 −2
Original line number Diff line number Diff line
@@ -358,7 +358,7 @@ static void rcu_idle_enter_common(struct rcu_dynticks *rdtp, long long oldval) 
		struct task_struct *idle = idle_task(smp_processor_id());



		trace_rcu_dyntick("Error on entry: not idle task", oldval, 0);

		ftrace_dump(DUMP_ALL);

		ftrace_dump(DUMP_ORIG);

		WARN_ONCE(1, "Current pid: %d comm: %s / Idle pid: %d comm: %s",

			  current->pid, current->comm,

			  idle->pid, idle->comm); /* must be idle task! */
@@ -468,7 +468,7 @@ static void rcu_idle_exit_common(struct rcu_dynticks *rdtp, long long oldval) 


		trace_rcu_dyntick("Error on exit: not idle task",

				  oldval, rdtp->dynticks_nesting);

		ftrace_dump(DUMP_ALL);

		ftrace_dump(DUMP_ORIG);

		WARN_ONCE(1, "Current pid: %d comm: %s / Idle pid: %d comm: %s",

			  current->pid, current->comm,

			  idle->pid, idle->comm); /* must be idle task! */