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When a task is upmigrating via tickpath, the lower capacity CPU that is running the task will wake up the migration task to carry the migration to the other higher capacity CPU. The migration task dequeue the task from lower capacity CPU and enqueue it on the higher capacity CPU. A rescheduler IPI is sent now to the higher capacity CPU. If the higher capacity CPU was in deep sleep state, it results in more waiting time for the task to be upmigrated. This can be optimized by waking up the higher capacity CPU along with waking the migration task on the lower capacity CPU. Since we reserve the higher capacity CPU, the is_reserved() API can be used to prevent the CPU entering idle again. [clingutla@codeaurora.org: Resolved minor merge conflicts] Change-Id: I7bda9a905a66a9326c1dc74e50fa94eb58e6b705 Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org> Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org> Signed-off-by: Yaroslav Furman <yaro330@gmail.com> Signed-off-by: Richard Raya <rdxzv.dev@gmail.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.