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It is not necessary to send rescheduling IPI when target cpu is not idle for non-preempt kernel, because the target cpu will pick all the tasks on the run-queue before enter idle. Test this patch on RK3568-NVR, make cpu load to 100% with command: taskset 01 yes > /dev/null & taskset 02 yes > /dev/null & taskset 04 yes > /dev/null & taskset 08 yes > /dev/null & So that the cpu will not enter idle. without the patch, 32 channel video@25fps: [root@RK356X:/]# cat /proc/interrupts | grep IPI0; sleep 10; cat /proc/interrupts | grep IPI0 IPI0: 74204 58815 99596 81177 Rescheduling interrupts IPI0: 79503 76143 106149 87676 Rescheduling interrupts with the patch, 32 channel video@25fps: [root@RK356X:/]# cat /proc/interrupts | grep IPI0; sleep 10; cat /proc/interrupts | grep IPI0 IPI0: 28814 59314 60173 56759 Rescheduling interrupts IPI0: 28814 59314 60173 56759 Rescheduling interrupts Change-Id: I0d45a3d999696503124e693e7d6e145df719174a Signed-off-by: Liang Chen <cl@rock-chips.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.
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.