1What:		/sys/kernel/debug/powerpc/memtrace
2Date:		Aug 2017
3KernelVersion:	4.14
4Contact:	[email protected]
5Description:	This folder contains the relevant debugfs files for the
6		hardware trace macro to use. CONFIG_PPC64_HARDWARE_TRACING
7		must be set.
8
9What:		/sys/kernel/debug/powerpc/memtrace/enable
10Date:		Aug 2017
11KernelVersion:	4.14
12Contact:	[email protected]
13Description:	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
22What:		/sys/kernel/debug/powerpc/memtrace/<node-id>
23Date:		Aug 2017
24KernelVersion:	4.14
25Contact:	[email protected]
26Description:	This directory contains information about the removed memory
27		from the specific NUMA node.
28
29What:		/sys/kernel/debug/powerpc/memtrace/<node-id>/size
30Date:		Aug 2017
31KernelVersion:	4.14
32Contact:	[email protected]
33Description:	This contains the size of the memory removed from the node.
34
35What:		/sys/kernel/debug/powerpc/memtrace/<node-id>/start
36Date:		Aug 2017
37KernelVersion:	4.14
38Contact:	[email protected]
39Description:	This contains the start address of the removed memory.
40
41What:		/sys/kernel/debug/powerpc/memtrace/<node-id>/trace
42Date:		Aug 2017
43KernelVersion:	4.14
44Contact:	[email protected]
45Description:	This is where the hardware trace macro will output the trace
46		it generates.
47