Sorry, forget cc kernel development list. Core parking is a power control feature and it can co-work with NPTM to control system power budget through online/offline some CPUs in the system. These patches implement core parking feature for xen. They consist of 2 parts: dom0 patches and xen hypervisor patches. At dom0 side, patches include [Patch 1/3] intercept native pad (Processor Aggregator Device) logic, providing a native interface for natvie platform and a paravirt template for paravirt platform, so that os can implicitly hook to proper ops accordingly; [Patch 2/3] redirect paravirt template to Xen pv ops; [Patch 3/3] implement Xen pad logic, and when getting pad device notification, it hypercalls to Xen hypervisor for core parking. Due to the characteristic of xen continue_hypercall_on_cpu, dom0 seperately send/get core parking request/result; At Xen hypervisor side, patches include [Patch 1/2] implement hypercall through which dom0 send core parking request, and get core parking result; [Patch 2/2] implement Xen core parking. Different core parking sequence has different power/performance result, due to cpu socket/core/thread topology. This patch provide power-first and performance-first policies, users can choose core parking policy on their own demand, considering power and performance tradeoff. cc Shaohua, core parking feature author at linux kernel side. Thanks, Jinsong-- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/