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77d1dfda0e
When disabling cpuset.sched_load_balance we expect to be able to online CPUs without generating sched_domains. However this is currently completely broken. What happens is that we generate the sched_domains and then destroy them. This is because of the spurious 'default' domain build in cpuset_update_active_cpus(). That builds a single machine wide domain and then schedules a work to build the 'real' domains. The work then finds there are _no_ domains and destroys the lot again. Furthermore, if there actually were cpusets, building the machine wide domain is actively wrong, because it would allow tasks to 'escape' their cpuset. Also I don't think its needed, the scheduler really should respect the active mask. Reported-by: Ofer Levi(SW) <oferle@mellanox.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Tejun Heo <tj@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vineet.Gupta1@synopsys.com <Vineet.Gupta1@synopsys.com> Cc: rusty@rustcorp.com.au <rusty@rustcorp.com.au> Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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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.