mbox series

[0/5] tick/broadcast: Allow per-cpu timers to be used instead of broadcast

Message ID 20210520184705.10845-1-will@kernel.org (mailing list archive)
Headers show
Series tick/broadcast: Allow per-cpu timers to be used instead of broadcast | expand

Message

Will Deacon May 20, 2021, 6:47 p.m. UTC 
Hi all,

This patch series adds support for hardware where the per-cpu tick timer
cannot wake up from deep idle states (i.e. CLOCK_EVT_FEAT_C3STOP is set)
yet there is a secondary per-cpu timer which is generally less preferable
(i.e. slow to access) yet capable of delivering the wakeup.

The meat and potatoes are in patches 3 and 4, but since I've not hacked
on this part of the kernel before I would appreciate feedback on any of
the changes I'm proposing.

Cheers,

Will

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Lorenzo Colitti <lorenzo@google.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: kernel-team@android.com

--->8

Will Deacon (5):
  tick/broadcast: Drop unneeded CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
    guard
  tick/broadcast: Split __tick_broadcast_oneshot_control() into a helper
  tick/broadcast: Prefer per-cpu oneshot wakeup timers to broadcast
  tick/broadcast: Program wakeup timer when entering idle if required
  timer_list: Print name of per-cpu wakeup device

 kernel/time/tick-broadcast.c | 135 ++++++++++++++++++++++++++++++-----
 kernel/time/tick-common.c    |   2 +-
 kernel/time/tick-internal.h  |   5 +-
 kernel/time/timer_list.c     |  11 ++-
 4 files changed, 133 insertions(+), 20 deletions(-)