Commit 7941dbde authored Mar 17, 2014 by Andreea-Cristina Bernat Committed by Paul E. McKenney Apr 29, 2014

rcu: Add event tracing to dyntick_save_progress_counter().

This patch adds event tracing to dyntick_save_progress_counter() in the case
where it returns 1. I used the tracepoint string "dti" because this function
returns 1 in case the CPU is in dynticks idle mode.

Signed-off-by: Andreea-Cristina Bernat <bernat.ada@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

parent af952b91

kernel/rcu/tree.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -772,7 +772,12 @@ static int dyntick_save_progress_counter(struct rcu_data *rdp,
		{
		rdp->dynticks_snap = atomic_add_return(0, &rdp->dynticks->dynticks);
		rcu_sysidle_check_cpu(rdp, isidle, maxj);
		return (rdp->dynticks_snap & 0x1) == 0;
		if ((rdp->dynticks_snap & 0x1) == 0) {
		trace_rcu_fqs(rdp->rsp->name, rdp->gpnum, rdp->cpu, TPS("dti"));
		return 1;
		} else {
		return 0;
		}
		}

		/*