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From: Thomas Gleixner <tglx@linutronix.de>
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To: Ulf Hansson <ulf.hansson@linaro.org>, "Rafael J . Wysocki"
 <rafael@kernel.org>
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: Re: [PATCH v4 1/2] smp: Introduce a helper function to check for
 pending IPIs
In-Reply-To: <20251105095415.17269-2-ulf.hansson@linaro.org>
References: <20251105095415.17269-1-ulf.hansson@linaro.org>
 <20251105095415.17269-2-ulf.hansson@linaro.org>
Date: Thu, 13 Nov 2025 16:29:31 +0100
Message-ID: <874iqyc5no.ffs@tglx>
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On Wed, Nov 05 2025 at 10:54, Ulf Hansson wrote:
> When governors used during cpuidle try to find the most optimal idle state
> for a CPU or a group of CPUs, they are known to quite often fail. One
> reason for this is, that they are not taking into account whether there has
> been an IPI scheduled for any of the CPUs that are affected by the selected
> idle state.
>
> To enable pending IPIs to be taken into account for cpuidle decisions,
> introduce a new helper function, cpus_peek_for_pending_ipi().
>
> Suggested-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>