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

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Message-Id: <20210520184705.10845-1-will@kernel.org>
Date:   Thu, 20 May 2021 19:47:00 +0100
From:   Will Deacon <will@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Lorenzo Colitti <lorenzo@...gle.com>,
        John Stultz <john.stultz@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>, kernel-team@...roid.com
Subject: [PATCH 0/5] tick/broadcast: Allow per-cpu timers to be used instead of broadcast

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@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Marc Zyngier <maz@...nel.org>
Cc: Lorenzo Colitti <lorenzo@...gle.com>
Cc: John Stultz <john.stultz@...aro.org>
Cc: Stephen Boyd <sboyd@...nel.org>
Cc: kernel-team@...roid.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(-)

-- 
2.31.1.818.g46aad6cb9e-goog