[tip: timers/core] timers: Do not IPI for deferrable timers

tip-bot2 for Anna-Maria Behnsen
2023-12-20T15:59:11Z

The following commit has been merged into the timers/core branch of tip:

Commit-ID: d124c3393e798b1fb142ee728d5c8976d11e722d
Gitweb: https://git.kernel.org/tip/d124c3393e798b1fb142ee728d5c8976d11e722d
Author: Anna-Maria Behnsen <anna-maria@linutronix.de>
AuthorDate: Fri, 01 Dec 2023 10:26:28 +01:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Wed, 20 Dec 2023 16:49:38 +01:00

timers: Do not IPI for deferrable timers

Deferrable timers do not prevent CPU from going idle and are not taken into
account on idle path. Sending an IPI to a remote CPU when a new first
deferrable timer was enqueued will wake up the remote CPU but nothing will
be done regarding the deferrable timers.

Drop IPI completely when a new first deferrable timer was enqueued.

Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20231201092654.34614-7-anna-maria@linutronix.de

---
kernel/time/timer.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index ed8d606..9188205 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -571,18 +571,15 @@ static int calc_wheel_index(unsigned long expires, unsigned long clk,
static void
trigger_dyntick_cpu(struct timer_base *base, struct timer_list *timer)
{
- if (!is_timers_nohz_active())
- return;
-
/*
- * TODO: This wants some optimizing similar to the code below, but we
- * will do that when we switch from push to pull for deferrable timers.
+ * Deferrable timers do not prevent the CPU from entering dynticks and
+ * are not taken into account on the idle/nohz_full path. An IPI when a
+ * new deferrable timer is enqueued will wake up the remote CPU but
+ * nothing will be done with the deferrable timer base. Therefore skip
+ * the remote IPI for deferrable timers completely.
*/
- if (timer->flags & TIMER_DEFERRABLE) {
- if (tick_nohz_full_cpu(base->cpu))
- wake_up_nohz_cpu(base->cpu);
+ if (!is_timers_nohz_active() || timer->flags & TIMER_DEFERRABLE)
return;
- }

/*
* We might have to IPI the remote CPU if the base is idle and the