Commit 67826eae authored Apr 20, 2013 by Frederic Weisbecker

nohz: Disable the tick when irq resume in full dynticks CPU

Eventually try to disable tick on irq exit, now that the
fundamental infrastructure is in place.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Gilad Ben Yossef <gilad@benyossef.com>
Cc: Hakan Akkan <hakanakkan@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>

parent 99e5ada9

kernel/softirq.c

+14 −5

Original line number	Diff line number	Diff line
		@@ -337,6 +337,19 @@ static inline void invoke_softirq(void)
		}
		}

		static inline void tick_irq_exit(void)
		{
		#ifdef CONFIG_NO_HZ_COMMON
		int cpu = smp_processor_id();

		/* Make sure that timer wheel updates are propagated */
		if ((idle_cpu(cpu) && !need_resched()) \|\| tick_nohz_full_cpu(cpu)) {
		if (!in_interrupt())
		tick_nohz_irq_exit();
		}
		#endif
		}

		/*
		* Exit an interrupt context. Process softirqs if needed and possible:
		*/
		@@ -348,11 +361,7 @@ void irq_exit(void)
		if (!in_interrupt() && local_softirq_pending())
		invoke_softirq();

		#ifdef CONFIG_NO_HZ_COMMON
		/* Make sure that timer wheel updates are propagated */
		if (idle_cpu(smp_processor_id()) && !in_interrupt() && !need_resched())
		tick_nohz_irq_exit();
		#endif
		tick_irq_exit();
		rcu_irq_exit();
		sched_preempt_enable_no_resched();
		}