When servicing mmap() reads from file holes the current DAX code allocates
a page cache page of all zeroes and places the struct page pointer in the
mapping->page_tree radix tree. This has three major drawbacks:
1) It consumes memory unnecessarily. For every 4k page that is read via a
DAX
When servicing mmap() reads from file holes the current DAX code allocates
a page cache page of all zeroes and places the struct page pointer in the
mapping->page_tree radix tree. This has three major drawbacks:
1) It consumes memory unnecessarily. For every 4k page that is read via a
DAX
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