| From: |
| Frederic Weisbecker <frederic-AT-kernel.org> |
| To: |
| LKML <linux-kernel-AT-vger.kernel.org> |
| Subject: |
| [PATCH 0/6 v3] cpuidle: Handle TIF_NR_POLLING on behalf of polling idle states |
| Date: |
| Thu, 02 Jan 2025 16:01:54 +0100 |
| Message-ID: |
| <20250102150201.21639-1-frederic@kernel.org> |
| Cc: |
| Frederic Weisbecker <frederic-AT-kernel.org>, "Rafael J . Wysocki" <rafael-AT-kernel.org>, Daniel Lezcano <daniel.lezcano-AT-linaro.org>, linux-pm-AT-vger.kernel.org, Thomas Gleixner <tglx-AT-linutronix.de>, Ingo Molnar <mingo-AT-redhat.com>, Borislav Petkov <bp-AT-alien8.de>, Dave Hansen <dave.hansen-AT-linux.intel.com>, Peter Zijlstra <peterz-AT-infradead.org> |
| Archive-link: |
| Article |
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 v2:
_ Handle buggy mwait implementations (thanks Rafael)
Frederic Weisbecker (4):
cpuidle: Remove unnecessary current_clr_polling_and_test() from
haltpoll
x86/cpuidle: Move buggy mwait implementations away from
CPUIDLE_FLAG_MWAIT
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/arm/include/asm/cpuidle.h | 2 ++
arch/arm64/include/asm/cpuidle.h | 3 ++
arch/powerpc/include/asm/cpuidle.h | 4 +++
arch/riscv/include/asm/cpuidle.h | 2 ++
arch/x86/include/asm/cpuidle.h | 12 +++++++
arch/x86/include/asm/mwait.h | 27 +++++++--------
drivers/acpi/processor_idle.c | 5 +++
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 | 8 +++++
include/asm-generic/Kbuild | 1 +
include/asm-generic/cpuidle.h | 10 ++++++
include/linux/cpuidle.h | 1 +
include/linux/sched/idle.h | 7 +++-
kernel/sched/idle.c | 53 +++++++++---------------------
18 files changed, 114 insertions(+), 97 deletions(-)
create mode 100644 arch/x86/include/asm/cpuidle.h
create mode 100644 include/asm-generic/cpuidle.h
--
2.46.0
