| xj | b04a402 | 2021-11-25 15:01:52 +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 each NUMA node in the kernel mappings and the following |
| 17 | debugfs files will be created. Once memory is successfully |
| 18 | removed from each node, the following files are created. To |
| 19 | re-add memory to the kernel, echo 0 into this file (it will be |
| 20 | automatically onlined). |
| 21 | |
| 22 | What: /sys/kernel/debug/powerpc/memtrace/<node-id> |
| 23 | Date: Aug 2017 |
| 24 | KernelVersion: 4.14 |
| 25 | Contact: linuxppc-dev@lists.ozlabs.org |
| 26 | Description: This directory contains information about the removed memory |
| 27 | from the specific NUMA node. |
| 28 | |
| 29 | What: /sys/kernel/debug/powerpc/memtrace/<node-id>/size |
| 30 | Date: Aug 2017 |
| 31 | KernelVersion: 4.14 |
| 32 | Contact: linuxppc-dev@lists.ozlabs.org |
| 33 | Description: This contains the size of the memory removed from the node. |
| 34 | |
| 35 | What: /sys/kernel/debug/powerpc/memtrace/<node-id>/start |
| 36 | Date: Aug 2017 |
| 37 | KernelVersion: 4.14 |
| 38 | Contact: linuxppc-dev@lists.ozlabs.org |
| 39 | Description: This contains the start address of the removed memory. |
| 40 | |
| 41 | What: /sys/kernel/debug/powerpc/memtrace/<node-id>/trace |
| 42 | Date: Aug 2017 |
| 43 | KernelVersion: 4.14 |
| 44 | Contact: linuxppc-dev@lists.ozlabs.org |
| 45 | Description: This is where the hardware trace macro will output the trace |
| 46 | it generates. |