2016. 7. 26. 14:17 devel/개념
__GFP_COMP - compound page
https://lwn.net/Articles/619514/
A compound page is simply a grouping of two or more physically contiguous pages into a unit that can, in many ways, be treated as a single, larger page. They are most commonly used to create huge pages, used within hugetlbfs or thetransparent huge pages subsystem
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