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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>
This commit is contained in:
Andreea-Cristina Bernat 2014-03-17 18:33:28 +02:00 committed by Paul E. McKenney
parent af952b919b
commit 7941dbdebe
1 changed files with 6 additions and 1 deletions
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7
kernel/rcu/tree.c
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@ -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;
}
}
/*