Commit-ID: 7941dbdebe2a1fda31aefa033794510f95720a5a Gitweb: http://git.kernel.org/tip/7941dbdebe2a1fda31aefa033794510f95720a5a Author: Andreea-Cristina Bernat <bernat.ada@xxxxxxxxx> AuthorDate: Mon, 17 Mar 2014 18:33:28 +0200 Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> CommitDate: Tue, 29 Apr 2014 08:44:49 -0700 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@xxxxxxxxx> Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> Reviewed-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx> --- kernel/rcu/tree.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index fca911b..c6fd0f1 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -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; + } } /* -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html