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

Message ID 20241206130408.18690-1-frederic@kernel.org
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Series cpuidle: Handle TIF_NR_POLLING on behalf of polling idle states v2 | expand

Message

Frederic Weisbecker Dec. 6, 2024, 1:04 p.m. UTC 
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(-)