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authorFrederic Weisbecker <fweisbec@gmail.com>2012-10-15 16:17:16 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2012-10-15 18:51:08 +0200
commit94a571402012e0dfaa23bbbdd64d033f48477d86 (patch)
tree84118deba518eedd0aae50155f214712ac594813 /kernel
parent9e8f559b08cbc1cfcbf093840a2a760a946cb90f (diff)
downloadlwn-94a571402012e0dfaa23bbbdd64d033f48477d86.tar.gz
lwn-94a571402012e0dfaa23bbbdd64d033f48477d86.zip
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/tick-sched.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 68a873af09a8..766d4c47a4a4 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -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)
{
+#ifdef CONFIG_NO_HZ
/*
* When we are idle and the tick is stopped, we have to touch
* 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))
ts->idle_jiffies++;
}
+#endif
update_process_times(user_mode(regs));
profile_tick(CPU_PROFILING);
}