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x86_64: prepare idle loop for dynamic ticks

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Add tick_nohz_{stop,restart}_sched_tick to idle loop in prepartion for turning
on dynticks.  These are just noops until NO_HZ is enabled.

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
This commit is contained in:
Chris Wright 2007-10-12 23:04:07 +02:00 committed by Thomas Gleixner
parent c4d58cbd15
commit 0229068334
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kernel/process_64.c
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@ -38,6 +38,7 @@
#include <linux/notifier.h> #include <linux/notifier.h>
#include <linux/kprobes.h> #include <linux/kprobes.h>
#include <linux/kdebug.h> #include <linux/kdebug.h>
#include <linux/tick.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
#include <asm/pgtable.h> #include <asm/pgtable.h>
@ -208,6 +209,8 @@ void cpu_idle (void)
if (__get_cpu_var(cpu_idle_state)) if (__get_cpu_var(cpu_idle_state))
__get_cpu_var(cpu_idle_state) = 0; __get_cpu_var(cpu_idle_state) = 0;
tick_nohz_stop_sched_tick();
rmb(); rmb();
idle = pm_idle; idle = pm_idle;
if (!idle) if (!idle)
@ -228,6 +231,7 @@ void cpu_idle (void)
__exit_idle(); __exit_idle();
} }
tick_nohz_restart_sched_tick();
preempt_enable_no_resched(); preempt_enable_no_resched();
schedule(); schedule();
preempt_disable(); preempt_disable();