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Rafael J. Wysocki 9d589661f2 cpuidle: governors: menu: Always check timers with tick stopped 
[ Upstream commit 80606f4eb8 ]

After commit 5484e31bbb ("cpuidle: menu: Skip tick_nohz_get_sleep_length()
call in some cases"), if the return value of get_typical_interval()
multiplied by NSEC_PER_USEC is not greater than RESIDENCY_THRESHOLD_NS,
the menu governor will skip computing the time till the closest timer.
If that happens when the tick has been stopped already, the selected
idle state may be too deep due to the subsequent check comparing
predicted_ns with TICK_NSEC and causing its value to be replaced with
the expected time till the closest timer, which is KTIME_MAX in that
case.  That will cause the deepest enabled idle state to be selected,
but the time till the closest timer very well may be shorter than the
target residency of that state, in which case a shallower state should
be used.

Address this by making menu_select() always compute the time till the
closest timer when the tick has been stopped.

Also move the predicted_ns check mentioned above into the branch in
which the time till the closest timer is determined because it only
needs to be done in that case.

Fixes: 5484e31bbb ("cpuidle: menu: Skip tick_nohz_get_sleep_length() call in some cases")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Christian Loehle <christian.loehle@arm.com>
Link: https://patch.msgid.link/5959091.DvuYhMxLoT@rafael.j.wysocki
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-02-26 14:59:00 -08:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.