linux-kernel - [PATCH v1 0/5] cpuidle: governors: teo: Wakeup events classification change and some refinements

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Message-ID: <2257365.irdbgypaU6@rafael.j.wysocki>
Date: Wed, 14 Jan 2026 20:42:55 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Christian Loehle <christian.loehle@....com>,
 Doug Smythies <dsmythies@...us.net>
Subject:
 [PATCH v1 0/5] cpuidle: governors: teo: Wakeup events classification change
 and some refinements

Hi All,

This material has been in my local queue for almost a full development cycle,
so time to post it.

The motivation for the changes in this series is mostly theoretical, but I do
see some idle power improvements from patch [4/5], for example, but nothing
specifically worth reporting.

The first patch simply prevents idle states with zero-size bins from being
selected sometimes when teo_select() runs with stopped tick.

Patch [2/5] avoids counting tick wakeups as intercepts unless there are
sufficiently many intercepts within the tick period range to assume that
the tick wakeup may have clobbered a genuine intercept.

Patch [3/5] simply updates a coefficient in one of the inequalities to be
somewhat easier to interpret (this should be a cosmetic change).

Patch [4/5] changes the criteria used for classifying wakeup events as hits
or intercepts to (hopefully) make the classification work better for large
state bins.

Patch [5/5] refines the idle state lookup based on intercepts to first
consider the state with the maximum intercepts metric, so that state is
always taken into consideration.

Please see the individual patch changelogs for details.

Thanks!