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authorThomas Gleixner <tglx@linutronix.de>2016-07-04 09:50:35 +0000
committerIngo Molnar <mingo@kernel.org>2016-07-07 10:35:10 +0200
commitff00673292bd42a3688b33de47252a6a3c3f424c (patch)
treeec7d8a8a099031f7f1551e9adf2e75a90461a4c9 /kernel
parent236968383cf5cd48835ff0d8a265e299e220d140 (diff)
timers/nohz: Remove pointless tick_nohz_kick_tick() function
This was a failed attempt to optimize the timer expiry in idle, which was disabled and never revisited. Remove the cruft. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Arjan van de Ven <arjan@infradead.org> Cc: Chris Mason <clm@fb.com> Cc: Eric Dumazet <edumazet@google.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: George Spelvin <linux@sciencehorizons.net> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Len Brown <lenb@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20160704094342.431073782@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/tick-sched.c33
1 files changed, 1 insertions, 32 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 536ada80f6dd..69abc7bfe80f 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -1092,35 +1092,6 @@ static void tick_nohz_switch_to_nohz(void)
tick_nohz_activate(ts, NOHZ_MODE_LOWRES);
}
-/*
- * When NOHZ is enabled and the tick is stopped, we need to kick the
- * tick timer from irq_enter() so that the jiffies update is kept
- * alive during long running softirqs. That's ugly as hell, but
- * correctness is key even if we need to fix the offending softirq in
- * the first place.
- *
- * Note, this is different to tick_nohz_restart. We just kick the
- * timer and do not touch the other magic bits which need to be done
- * when idle is left.
- */
-static void tick_nohz_kick_tick(struct tick_sched *ts, ktime_t now)
-{
-#if 0
- /* Switch back to 2.6.27 behaviour */
- ktime_t delta;
-
- /*
- * Do not touch the tick device, when the next expiry is either
- * already reached or less/equal than the tick period.
- */
- delta = ktime_sub(hrtimer_get_expires(&ts->sched_timer), now);
- if (delta.tv64 <= tick_period.tv64)
- return;
-
- tick_nohz_restart(ts, now);
-#endif
-}
-
static inline void tick_nohz_irq_enter(void)
{
struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);
@@ -1131,10 +1102,8 @@ static inline void tick_nohz_irq_enter(void)
now = ktime_get();
if (ts->idle_active)
tick_nohz_stop_idle(ts, now);
- if (ts->tick_stopped) {
+ if (ts->tick_stopped)
tick_nohz_update_jiffies(now);
- tick_nohz_kick_tick(ts, now);
- }
}
#else