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Thursday, May 30 • 4:20pm - 5:10pm
Shift the Last CPU: CPU0 Hot Plug - Fenghua Yu, Intel

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CPU0 or BSP (Bootstrap Processor) has been the last processor that cannot be hot plugged on x86. We implement CPU0 online/offline and remove this obstacle to CPU hotplug. RAS needs the feature. If socket0 needs to be hot plugged for any reason (any thread on socket0 is bad, shared cache issue, uncore issue, etc), CPU0 is required to be offline to keep the system run. The implementation removes all road blocks which prevent kernel from removing BSP, fixes up various issues e.g. irq, wakes up BSP through NMI, handles S3/S4 etc. The code is in kernel 3.7 now.

Targeted audience are kernel developers, RAS developers, and BIOS/platform designers. The skillful speaker will discuss how this long time issue is solved in kernel and how to utilize this feature in new RAS BIOS and platform designs. Ability of hot plugging all CPUs opens doors to new ways of power management and ucocode loading too.

avatar for Fenghua Yu

Fenghua Yu

Linux Kernel Developer, Intel
Fenghua Yu is a Linux kernel developer in Intel. He has been working on Linux kernel development for over ten years. His projects cover various areas include platform QoS, EFI, kernel optimization, power management, context switch, security, etc. He lives in the San Francisco bay area.

Thursday May 30, 2013 4:20pm - 5:10pm

Attendees (5)