NOTE:
These directories/files appear after physical memory hotplug phase.
-If CONFIG_NUMA is enabled the
-/sys/devices/system/memory/memoryXXX memory section
-directories can also be accessed via symbolic links located in
-the /sys/devices/system/node/node* directories. For example:
+If CONFIG_NUMA is enabled the memoryXXX/ directories can also be accessed
+via symbolic links located in the /sys/devices/system/node/node* directories.
+
+For example:
/sys/devices/system/node/node0/memory9 -> ../../memory/memory9
+A backlink will also be created:
+/sys/devices/system/memory/memory9/node0 -> ../../node/node0
+
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4. Physical memory hot-add phase
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