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27d84b63b0
When RT Capacity Aware support was added, the logic in select_task_rq_rt was modified to force a search for a fitting CPU if the task currently doesn't run on one. But if the search failed, and the search was only triggered to fulfill the fitness request; we could end up selecting a new CPU unnecessarily. Fix this and re-instate the original behavior by ensuring we bail out in that case. This behavior change only affected asymmetric systems that are using util_clamp to implement capacity aware. None asymmetric systems weren't affected. Bug: 120440300 LINK: https://lore.kernel.org/lkml/20200218041620.GD28029@codeaurora.org/ Reported-by: Pavan Kondeti <pkondeti@codeaurora.org> Signed-off-by: Qais Yousef <qais.yousef@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Fixes:804d402fb6("sched/rt: Make RT capacity-aware") Link: https://lkml.kernel.org/r/20200302132721.8353-3-qais.yousef@arm.com (cherry picked from commitb28bc1e002https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core) Signed-off-by: Qais Yousef <qais.yousef@arm.com> Change-Id: I670ab7f95a3bd8b4790e1cafe89308ead524367e
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.