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authorThomas Gleixner <tglx@linutronix.de>2016-07-04 11:50:36 +0200
committerIngo Molnar <mingo@kernel.org>2016-07-07 10:35:11 +0200
commita683f390b93f4d1292f849fc48d28e322046120f (patch)
treede6367ae59e62bad9135eeff3b35512158e335e5 /kernel/time/tick-internal.h
parenttimers/nohz: Remove pointless tick_nohz_kick_tick() function (diff)
downloadlinux-a683f390b93f4d1292f849fc48d28e322046120f.tar.xz
linux-a683f390b93f4d1292f849fc48d28e322046120f.zip
timers: Forward the wheel clock whenever possible
The wheel clock is stale when a CPU goes into a long idle sleep. This has the side effect that timers which are queued end up in the outer wheel levels. That results in coarser granularity. To solve this, we keep track of the idle state and forward the wheel clock whenever possible. 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/20160704094342.512039360@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/time/tick-internal.h')
-rw-r--r--kernel/time/tick-internal.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h
index 966a5a6fdd0a..f738251000fe 100644
--- a/kernel/time/tick-internal.h
+++ b/kernel/time/tick-internal.h
@@ -164,3 +164,4 @@ static inline void timers_update_migration(bool update_nohz) { }
DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem);
+void timer_clear_idle(void);