From: Ulf Hansson <ulf.hansson@linaro.org>
To: "Rafael J . Wysocki" <rafael@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>
Cc: Mark Rutland <mark.rutland@arm.com>,
Marc Zyngier <maz@kernel.org>,
Maulik Shah <quic_mkshah@quicinc.com>,
Sudeep Holla <sudeep.holla@arm.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
Ben Horgan <ben.horgan@arm.com>,
linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Ulf Hansson <ulf.hansson@linaro.org>
Subject: [PATCH v3 0/2] pmdomain: Improve idle state selection for CPUs
Date: Fri, 31 Oct 2025 12:00:56 +0100 [thread overview]
Message-ID: <20251031110106.62394-1-ulf.hansson@linaro.org> (raw)
Platforms using the genpd governor for CPUs are relying on it to find the most
optimal idle state for a group of CPUs. Although, observations tells us that
there are some significant improvement that can be made around this.
These improvement are based upon allowing us to take pending IPIs into account
for the group of CPUs that the genpd governor is in control of. If there is
pending IPI for any of these CPUs, we should not request an idle state that
affects the group, but rather pick a shallower state that affects only the CPU.
More details are available in the commit messages for each patch.
Kind regards
Ulf Hansson
Ulf Hansson (2):
smp: Introduce a helper function to check for pending IPIs
pmdomain: Extend the genpd governor for CPUs to account for IPIs
drivers/pmdomain/governor.c | 20 +++++++++++++-------
include/linux/smp.h | 5 +++++
kernel/smp.c | 24 ++++++++++++++++++++++++
3 files changed, 42 insertions(+), 7 deletions(-)
--
2.43.0
next reply other threads:[~2025-10-31 11:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-31 11:00 Ulf Hansson [this message]
2025-10-31 11:00 ` [PATCH v3 1/2] smp: Introduce a helper function to check for pending IPIs Ulf Hansson
2025-11-01 19:59 ` Thomas Gleixner
2025-10-31 11:00 ` [PATCH v3 2/2] pmdomain: Extend the genpd governor for CPUs to account for IPIs Ulf Hansson
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