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This patch provide Xen physical cpus online/offline sys interface. User can use it for their own purpose, like power saving: by offlining some cpus when light workload it save power greatly. Its basic workflow is, user online/offline cpu via sys interface, then hypercall xen to implement, after done xen inject virq back to dom0, and then dom0 sync cpu status. Signed-off-by: Jiang, Yunhong <yunhong.jiang@intel.com> Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
21 lines
670 B
Plaintext
21 lines
670 B
Plaintext
What: /sys/devices/system/xen_cpu/
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Date: May 2012
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Contact: Liu, Jinsong <jinsong.liu@intel.com>
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Description:
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A collection of global/individual Xen physical cpu attributes
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Individual physical cpu attributes are contained in
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subdirectories named by the Xen's logical cpu number, e.g.:
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/sys/devices/system/xen_cpu/xen_cpu#/
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What: /sys/devices/system/xen_cpu/xen_cpu#/online
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Date: May 2012
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Contact: Liu, Jinsong <jinsong.liu@intel.com>
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Description:
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Interface to online/offline Xen physical cpus
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When running under Xen platform, it provide user interface
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to online/offline physical cpus, except cpu0 due to several
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logic restrictions and assumptions.
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