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Commit 1f84c262 authored by Rashmica Gupta's avatar Rashmica Gupta Committed by Michael Ellerman
Browse files

Add documentation for the powerpc memtrace debugfs files 



CONFIG_PPC_MEMTRACE must be set to use this feature. This can only be
used on powernv platforms.

Signed-off-by: default avatarRashmica Gupta <rashmica.g@gmail.com>
[mpe: Update dates and kernel versions, mention size is in bytes]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 9d5171a8

Documentation/ABI/testing/ppc-memtrace

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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.