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What:		/sys/kernel/mm/cma/
Date:		Feb 2021
Contact:	Minchan Kim <minchan@kernel.org>
Description:
		/sys/kernel/mm/cma/ contains a subdirectory for each CMA
		heap name (also sometimes called CMA areas).

		Each CMA heap subdirectory (that is, each
		/sys/kernel/mm/cma/<cma-heap-name> directory) contains the
		following items:

			alloc_pages_success
			alloc_pages_fail

What:		/sys/kernel/mm/cma/<cma-heap-name>/alloc_pages_success
Date:		Feb 2021
Contact:	Minchan Kim <minchan@kernel.org>
Description:
		the number of pages CMA API succeeded to allocate

What:		/sys/kernel/mm/cma/<cma-heap-name>/alloc_pages_fail
Date:		Feb 2021
Contact:	Minchan Kim <minchan@kernel.org>
Description:
		the number of pages CMA API failed to allocate