>> Start Bug Report << Bug ID: 211287 https://bugzilla.kernel.org/show_bug.cgi?id=211287 Summary: Softdirty bit does not work with hugetlb When a memory region is mapped with huge pages, the softdirty bit is set only right after the huge pages is mapped. After the memory mapping, if the softdirty bit is cleared and the memory is written again, the softdirty bit is not set when reading from the process's pagemap. >> End Bug Report << I am not surprised with this reported bug. The page fault code diverges pretty quickly for hugetlb pages. I have not looked closely at the details of soft dirty, and do not immediately see where in the fault path for normal pages it gets reset. But, I only took a quick glance. I can work on adding support for hugetlb. Can you provide some details about your use case? -- Mike Kravetz
