Hello, Michael. On Thu, Jul 27, 2017 at 12:06:22PM -0500, Michael Bringmann wrote: > > On NUMA systems with dynamic processors, the content of the cpumask > may change over time. As new processors are added via DLPAR operations, > workqueues are created for them. Depending upon the order in which CPUs > are added/removed, we may run into problems with the content of the > cpumask used by the workqueues. This patch deals with situations where > the online cpumask for a node is a proper superset of possible cpumask > for the node. It also deals with edge cases where the order in which > CPUs are removed/added from the online cpumask may leave the set for a > node empty, and require execution by CPUs on another node.
I think we already talked about this before but can you please note that this is a bandaid to workaround an underlying bug. This isn't something which normally happens on NUMA sytems with dynamic processors. This is bandaiding a hole so that the machine at least doesn't crash immediately until we can get the underlying problem fixed properly. Thanks. -- tejun
