cpuset: Define data structures to support scheduling partition
>From a cpuset point of view, a scheduling partition is a group of cpusets with their own set of exclusive CPUs that are not shared by other tasks outside the scheduling partition. In the legacy hierarchy, scheduling partitions are supported indirectly via the right use of the load balancing and the exclusive CPUs flag which is not intuitive and can be hard to use. To fully support the concept of scheduling partitions in the default hierarchy, we need to add some new field into the cpuset structure as well as a new tmpmasks structure that is used to pre-allocate cpumasks at the top level cpuset functions to avoid memory allocation in inner functions as memory allocation failure in those inner functions may cause a cpuset to have inconsistent states. Signed-off-by:Waiman Long <longman@redhat.com> Acked-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:
Tejun Heo <tj@kernel.org>
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