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| author | Rashmica Gupta <rashmica.g@gmail.com> | 2017-06-01 08:34:40 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-08-28 15:09:43 +0300 |
| commit | 1f84c2624a2d75c9f69214ed83f11dd30a8ae83d (patch) | |
| tree | e3cb0f8311004a7ca633697e4bd90aa35a4cba4d /Documentation/ABI/testing/ppc-memtrace | |
| parent | 9d5171a8f248b1b0e69329bf141e17645c0324a0 (diff) | |
| download | linux-1f84c2624a2d75c9f69214ed83f11dd30a8ae83d.tar.xz | |
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: Rashmica Gupta <rashmica.g@gmail.com>
[mpe: Update dates and kernel versions, mention size is in bytes]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'Documentation/ABI/testing/ppc-memtrace')
| -rw-r--r-- | Documentation/ABI/testing/ppc-memtrace | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/ppc-memtrace b/Documentation/ABI/testing/ppc-memtrace new file mode 100644 index 000000000000..2e8b93741270 --- /dev/null +++ b/Documentation/ABI/testing/ppc-memtrace @@ -0,0 +1,45 @@ +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. |