26c88f9301
Add some documentation about ... /sys/devices/system/cpu/dscr_default /sys/devices/system/cpu/cpuN/dscr ... to Documentation/ABI/stable. Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
25 lines
979 B
Text
25 lines
979 B
Text
What: /sys/devices/system/cpu/dscr_default
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Date: 13-May-2014
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KernelVersion: v3.15.0
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Contact:
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Description: Writes are equivalent to writing to
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/sys/devices/system/cpu/cpuN/dscr on all CPUs.
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Reads return the last written value or 0.
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This value is not a global default: it is a way to set
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all per-CPU defaults at the same time.
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Values: 64 bit unsigned integer (bit field)
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What: /sys/devices/system/cpu/cpu[0-9]+/dscr
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Date: 13-May-2014
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KernelVersion: v3.15.0
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Contact:
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Description: Default value for the Data Stream Control Register (DSCR) on
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a CPU.
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This default value is used when the kernel is executing and
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for any process that has not set the DSCR itself.
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If a process ever sets the DSCR (via direct access to the
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SPR) that value will be persisted for that process and used
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on any CPU where it executes (overriding the value described
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here).
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If set by a process it will be inherited by child processes.
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Values: 64 bit unsigned integer (bit field)
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