What: /sys/kernel/debug/powerpc/memtrace
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Date: Aug 2017
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KernelVersion: 4.14
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: This folder contains the relevant debugfs files for the
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hardware trace macro to use. CONFIG_PPC64_HARDWARE_TRACING
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must be set.
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What: /sys/kernel/debug/powerpc/memtrace/enable
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Date: Aug 2017
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KernelVersion: 4.14
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: Write an integer containing the size in bytes of the memory
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you want removed from each NUMA node to this file - it must be
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aligned to the memblock size. This amount of RAM will be removed
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from each NUMA node in the kernel mappings and the following
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debugfs files will be created. Once memory is successfully
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removed from each node, the following files are created. To
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re-add memory to the kernel, echo 0 into this file (it will be
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automatically onlined).
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What: /sys/kernel/debug/powerpc/memtrace/<node-id>
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Date: Aug 2017
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KernelVersion: 4.14
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: This directory contains information about the removed memory
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from the specific NUMA node.
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What: /sys/kernel/debug/powerpc/memtrace/<node-id>/size
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Date: Aug 2017
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KernelVersion: 4.14
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: This contains the size of the memory removed from the node.
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What: /sys/kernel/debug/powerpc/memtrace/<node-id>/start
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Date: Aug 2017
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KernelVersion: 4.14
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: This contains the start address of the removed memory.
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What: /sys/kernel/debug/powerpc/memtrace/<node-id>/trace
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Date: Aug 2017
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KernelVersion: 4.14
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: This is where the hardware trace macro will output the trace
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it generates.
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