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tick: Conditionally build nohz specific code in tick handler 

This optimize a bit the high res tick sched handler.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
This commit is contained in:
Frederic Weisbecker 2012-10-15 16:17:16 +02:00
parent 9e8f559b08
commit 94a5714020
1 changed files with 2 additions and 0 deletions
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2
kernel/time/tick-sched.c
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@ -122,6 +122,7 @@ static void tick_sched_do_timer(ktime_t now)
static void tick_sched_handle(struct tick_sched *ts, struct pt_regs *regs) static void tick_sched_handle(struct tick_sched *ts, struct pt_regs *regs)
{ {
#ifdef CONFIG_NO_HZ
/* /*
* When we are idle and the tick is stopped, we have to touch * When we are idle and the tick is stopped, we have to touch
* the watchdog as we might not schedule for a really long * the watchdog as we might not schedule for a really long
@ -135,6 +136,7 @@ static void tick_sched_handle(struct tick_sched *ts, struct pt_regs *regs)
if (is_idle_task(current)) if (is_idle_task(current))
ts->idle_jiffies++; ts->idle_jiffies++;
} }
#endif
update_process_times(user_mode(regs)); update_process_times(user_mode(regs));
profile_tick(CPU_PROFILING); profile_tick(CPU_PROFILING);
} }