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Our runnable_weight currently looks like this runnable_weight = shares * runnable_load_avg / load_avg The goal is to scale the runnable weight for the group based on its runnable to load_avg ratio. The problem with this is it biases us towards tasks that never go to sleep. Tasks that go to sleep are going to have their runnable_load_avg decayed pretty hard, which will drastically reduce the runnable weight of groups with interactive tasks. To solve this imbalance we tweak this slightly, so in the ideal case it is still the above, but in the interactive case it is runnable_weight = shares * runnable_weight / load_weight which will make the weight distribution fairer between interactive and non-interactive groups. Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: kernel-team@fb.com Cc: linux-kernel@vger.kernel.org Cc: riel@redhat.com Cc: tj@kernel.org Link: http://lkml.kernel.org/r/1501773219-18774-2-git-send-email-jbacik@fb.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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.