| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | What: /sys/kernel/debug/powerpc/memtrace |
| 2 | Date: Aug 2017 |
| 3 | KernelVersion: 4.14 |
| 4 | Contact: linuxppc-dev@lists.ozlabs.org |
| 5 | Description: This folder contains the relevant debugfs files for the |
| 6 | hardware trace macro to use. CONFIG_PPC64_HARDWARE_TRACING |
| 7 | must be set. |
| 8 | |
| 9 | What: /sys/kernel/debug/powerpc/memtrace/enable |
| 10 | Date: Aug 2017 |
| 11 | KernelVersion: 4.14 |
| 12 | Contact: linuxppc-dev@lists.ozlabs.org |
| 13 | Description: Write an integer containing the size in bytes of the memory |
| 14 | you want removed from each NUMA node to this file - it must be |
| 15 | aligned to the memblock size. This amount of RAM will be removed |
| 16 | from the kernel mappings and the following debugfs files will be |
| 17 | created. This can only be successfully done once per boot. Once |
| 18 | memory is successfully removed from each node, the following |
| 19 | files are created. |
| 20 | |
| 21 | What: /sys/kernel/debug/powerpc/memtrace/<node-id> |
| 22 | Date: Aug 2017 |
| 23 | KernelVersion: 4.14 |
| 24 | Contact: linuxppc-dev@lists.ozlabs.org |
| 25 | Description: This directory contains information about the removed memory |
| 26 | from the specific NUMA node. |
| 27 | |
| 28 | What: /sys/kernel/debug/powerpc/memtrace/<node-id>/size |
| 29 | Date: Aug 2017 |
| 30 | KernelVersion: 4.14 |
| 31 | Contact: linuxppc-dev@lists.ozlabs.org |
| 32 | Description: This contains the size of the memory removed from the node. |
| 33 | |
| 34 | What: /sys/kernel/debug/powerpc/memtrace/<node-id>/start |
| 35 | Date: Aug 2017 |
| 36 | KernelVersion: 4.14 |
| 37 | Contact: linuxppc-dev@lists.ozlabs.org |
| 38 | Description: This contains the start address of the removed memory. |
| 39 | |
| 40 | What: /sys/kernel/debug/powerpc/memtrace/<node-id>/trace |
| 41 | Date: Aug 2017 |
| 42 | KernelVersion: 4.14 |
| 43 | Contact: linuxppc-dev@lists.ozlabs.org |
| 44 | Description: This is where the hardware trace macro will output the trace |
| 45 | it generates. |