[PATCH] tick-management: dyntick / highres functionality

With Ingo Molnar <mingo@elte.hu>

Add functions to provide dynamic ticks and high resolution timers.  The code
which keeps track of jiffies and handles the long idle periods is shared
between tick based and high resolution timer based dynticks.  The dyntick
functionality can be disabled on the kernel commandline.  Provide also the
infrastructure to support high resolution timers.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/kernel/timer.c b/kernel/timer.c
index 7d522bdf8265..f058e6cfd50c 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -34,7 +34,7 @@
 #include <linux/cpu.h>
 #include <linux/syscalls.h>
 #include <linux/delay.h>
-#include <linux/clockchips.h>
+#include <linux/tick.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -874,6 +874,8 @@ static void change_clocksource(void)
         clock->xtime_nsec = 0;
         clocksource_calculate_interval(clock, NTP_INTERVAL_LENGTH);
 
+        tick_clock_notify();
+
         printk(KERN_INFO "Time: %s clocksource has been installed.\n",
                clock->name);
 }
@@ -937,7 +939,6 @@ void __init timekeeping_init(void)
         write_sequnlock_irqrestore(&xtime_lock, flags);
 }
 
-
 /* flag for if timekeeping is suspended */
 static int timekeeping_suspended;
 /* time in seconds when suspend began */