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CloudOpen Japan is a conference celebrating and exploring the open source projects, technologies and companies who make up the cloud. It’s built on a belief that open works: for users, for industry and for technology.

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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.


Fenghua Yu

Linux Kernel Developer, Intel
Fenghua Yu is a Linux kernel developer working in Intel based in Santa Clara, CA. He has been working on various Linux kernel projects including early microcode loading, CPU0 hot plug, xstate context switch, thermal coretemp, performance optimization, EFI, etc. He is maintainer for two kernel components IA64 and x86 coretemp. | | His speaking include: | 1. Shift the Last CPU: CPU0 Hot Plug, LinuxCon/CloudOpen Japan, 2013 | 2. Simics... Read More →

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

Attendees (5)

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