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+What: /sys/kernel/mm/swap/
+Date: August 2017
+Contact: Linux memory management mailing list <linux-mm@kvack.org>
+Description: Interface for swapping
+
+What: /sys/kernel/mm/swap/vma_ra_enabled
+Date: August 2017
+Contact: Linux memory management mailing list <linux-mm@kvack.org>
+Description: Enable/disable VMA based swap readahead.
+
+ If set to true, the VMA based swap readahead algorithm
+ will be used for swappable anonymous pages mapped in a
+ VMA, and the global swap readahead algorithm will be
+ still used for tmpfs etc. other users. If set to
+ false, the global swap readahead algorithm will be
+ used for all swappable pages.
+
+What: /sys/kernel/mm/swap/vma_ra_max_order
+Date: August 2017
+Contact: Linux memory management mailing list <linux-mm@kvack.org>
+Description: The max readahead size in order for VMA based swap readahead
+
+ VMA based swap readahead algorithm will readahead at
+ most 1 << max_order pages for each readahead. The
+ real readahead size for each readahead will be scaled
+ according to the estimation algorithm.