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authorFrederic Weisbecker <fweisbec@gmail.com>2011-11-17 18:48:14 +0100
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-12-11 19:31:57 +0100
commit1268fbc746ea1cd279886a740dcbad4ba5232225 (patch)
treedc0ff36b4114992a3f67479e25132f5e99f36b9e /arch/tile
parentrcu: Add rcutorture CPU-hotplug capability (diff)
downloadlinux-1268fbc746ea1cd279886a740dcbad4ba5232225.tar.xz
linux-1268fbc746ea1cd279886a740dcbad4ba5232225.zip
nohz: Remove tick_nohz_idle_enter_norcu() / tick_nohz_idle_exit_norcu()
Those two APIs were provided to optimize the calls of tick_nohz_idle_enter() and rcu_idle_enter() into a single irq disabled section. This way no interrupt happening in-between would needlessly process any RCU job. Now we are talking about an optimization for which benefits have yet to be measured. Let's start simple and completely decouple idle rcu and dyntick idle logics to simplify. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'arch/tile')
-rw-r--r--arch/tile/kernel/process.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
index 53ac89595ab1..4c1ac6e5347a 100644
--- a/arch/tile/kernel/process.c
+++ b/arch/tile/kernel/process.c
@@ -85,7 +85,8 @@ void cpu_idle(void)
/* endless idle loop with no priority at all */
while (1) {
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
while (!need_resched()) {
if (cpu_is_offline(cpu))
BUG(); /* no HOTPLUG_CPU */
@@ -105,7 +106,8 @@ void cpu_idle(void)
local_irq_enable();
current_thread_info()->status |= TS_POLLING;
}
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();