On 07/06/2012 01:13 PM, Toshi Kani wrote:
For step 2) and 4), I am wondering if they are relevant to CPU hotplug these days. In ACPI namespace, a processor object represents a logical processor (or a core when hyper-threading is disabled). A physical processor (i.e. a socket) usually has multiple cores, and memory controller and bus interface are part of the socket functionality. Hence, I think step 2) and 4) belong to socket-level hot-removal operation, which can be implemented as container hot-remove when a socket is represented with a container object.
What does it mean to eject just a core in that case? If there are seven other cores in the physical processor and you get a request to eject one core, what would you expect kernel to do - simply move all processes and interrupts off of that core, take it out of scheduling consideration and simply idle the core? If yes, how is that any different from simply offlining a core? If you are ejecting individual cores at a time, do you keep track of how many you have ejected and then eject the entire physical CPU along with memory and IOH associated with the socket when the last core is ejected? -- Khalid ==================================================================== Khalid Aziz Unix Systems Lab (970)898-9214 Hewlett-Packard khalid.aziz@xxxxxx Fort Collins, CO -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
