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authorFrederic Weisbecker <fweisbec@gmail.com>2013-04-20 17:43:13 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2013-04-22 20:29:09 +0200
commit67826eae8c16dbf00c262be6ec15021bb42f69c4 (patch)
treecbfc0c729a86e1d3e9fbcdfc0a085bd5b740c128 /kernel/softirq.c
parent99e5ada9407cc19d7c4c05ce2165f20dc46fc093 (diff)
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>
Diffstat (limited to 'kernel/softirq.c')
-rw-r--r--kernel/softirq.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c
index de15813f2a6..8b1446d4a4d 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -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();
}