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rcu: Add tracing to irq/NMI dyntick-idle transitions

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Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2017-10-04 12:29:01 -07:00
parent 844ccdd7dc
commit bd2b879a1c
2 changed files with 14 additions and 6 deletions
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6
kernel/rcu/tree.c
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@@ -880,12 +880,15 @@ void rcu_nmi_exit(void)
* leave it in non-RCU-idle state.
*/
if (rdtp->dynticks_nmi_nesting != 1) {
trace_rcu_dyntick(TPS("--="), rdtp->dynticks_nmi_nesting,
rdtp->dynticks_nmi_nesting - 2);
WRITE_ONCE(rdtp->dynticks_nmi_nesting, /* No store tearing. */
rdtp->dynticks_nmi_nesting - 2);
return;
}
/* This NMI interrupted an RCU-idle CPU, restore RCU-idleness. */
trace_rcu_dyntick(TPS("Startirq"), rdtp->dynticks_nmi_nesting, 0);
WRITE_ONCE(rdtp->dynticks_nmi_nesting, 0); /* Avoid store tearing. */
rcu_dynticks_eqs_enter();
}
@@ -1057,6 +1060,9 @@ void rcu_nmi_enter(void)
rcu_dynticks_eqs_exit();
incby = 1;
}
trace_rcu_dyntick(incby == 1 ? TPS("Endirq") : TPS("++="),
rdtp->dynticks_nmi_nesting,
rdtp->dynticks_nmi_nesting + incby);
WRITE_ONCE(rdtp->dynticks_nmi_nesting, /* Prevent store tearing. */
rdtp->dynticks_nmi_nesting + incby);
barrier();