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

From: Frederic Weisbecker
Date: Fri Dec 06 2024 - 08:06:14 EST


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