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