mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-03-22 07:27:12 +08:00
5ddcc03a07
During the comparative study of cpuidle governors, it is noticed that the menu governor does not select CEDE state in some scenarios even though when the sleep duration of the CPU exceeds the target residency of the CEDE idle state this is because the CPU exits the snooze "polling" state when snooze time limit is reached in the snooze_loop(), which is not a real wake up and it just means that the polling state selection was not adequate. cpuidle governors rely on CPUIDLE_FLAG_POLLING flag to be set for the polling states to handle the condition mentioned above. Hence, set the CPUIDLE_FLAG_POLLING flag for snooze state (polling state) in powerpc arch to make the cpuidle governor work as expected. Reference Commits: - Timeout enabled for snooze state: commit78eaa10f02("cpuidle: powernv/pseries: Auto-promotion of snooze to deeper idle state") - commitdc2251bf98("cpuidle: Eliminate the CPUIDLE_DRIVER_STATE_START symbol") - Fix wakeup stats in governor for polling states commit5f26bdceb9("cpuidle: menu: Fix wakeup statistics updates for polling state") Signed-off-by: Aboorva Devarajan <aboorvad@linux.vnet.ibm.com> Tested-by: Vishal Chourasia <vishalc@linux.vnet.ibm.com> Reviewed-by: Vaidyanathan Srinivasan <svaidy@linux.ibm.com> Reviewed-by: Vishal Chourasia <vishalc@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20221114145611.37669-1-aboorvad@linux.vnet.ibm.com
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 Restructured Text 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.