linux-kernel - [PATCH 0/5] cpuidle: Handle TIF_NR_POLLING on behalf of polling idle states v2

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Message-ID: <20241206130408.18690-1-frederic@kernel.org>
Date: Fri,  6 Dec 2024 14:04:03 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-pm@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 0/5] cpuidle: Handle TIF_NR_POLLING on behalf of polling idle states v2

The TIF_NR_POLLING handling against TIF_NEED_RESCHED polling/monitoring
idle states (mwait and also software polling) is a bit messy, with quite
some wasted cycles spent on useless atomic operations. This tries to
consolidate this state handling from the cpuidle core.

Changes since v1:

* Drop two x86 applied patches
* s/CPUIDLE_FLAG_POLLING_HARD/CPUIDLE_FLAG_MWAIT (Rafael)
* Fix confusion between polling and monitoring on comments (Rafael)
* Remove call_cpuidle_s2idle() (Rafael)

Frederic Weisbecker (3):
  cpuidle: Remove unnecessary current_clr_polling_and_test() from
    haltpoll
  cpuidle: Remove call_cpuidle_s2idle()
  cpuidle: Handle TIF_NR_POLLING on behalf of software polling idle
    states

Peter Zijlstra (2):
  cpuidle: Introduce CPUIDLE_FLAG_MWAIT
  cpuidle: Handle TIF_NR_POLLING on behalf of CPUIDLE_FLAG_MWAIT states

 arch/x86/include/asm/mwait.h       |  3 +-
 drivers/acpi/processor_idle.c      |  3 ++
 drivers/cpuidle/cpuidle-haltpoll.c |  3 --
 drivers/cpuidle/cpuidle-powernv.c  | 10 ------
 drivers/cpuidle/cpuidle-pseries.c  | 11 -------
 drivers/cpuidle/cpuidle.c          | 22 ++++++++++++-
 drivers/cpuidle/poll_state.c       | 30 +++++++----------
 drivers/idle/intel_idle.c          |  5 ++-
 include/linux/cpuidle.h            |  1 +
 include/linux/sched/idle.h         |  7 +++-
 kernel/sched/idle.c                | 53 +++++++++---------------------
 11 files changed, 63 insertions(+), 85 deletions(-)

-- 
2.46.0