linux-kernel - Re: [PATCH v4 1/2] smp: Introduce a helper function to check for pending IPIs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <874iqyc5no.ffs@tglx>
Date: Thu, 13 Nov 2025 16:29:31 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Ulf Hansson <ulf.hansson@...aro.org>, "Rafael J . Wysocki"
 <rafael@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>, Marc Zyngier <maz@...nel.org>,
 Maulik Shah <quic_mkshah@...cinc.com>, Sudeep Holla
 <sudeep.holla@....com>, Daniel Lezcano <daniel.lezcano@...aro.org>,
 Vincent Guittot <vincent.guittot@...aro.org>, Ben Horgan
 <ben.horgan@....com>, linux-pm@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Ulf
 Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v4 1/2] smp: Introduce a helper function to check for
 pending IPIs

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@...utronix.de>
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>

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