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22 Currently, it consists of the only read-write file,
26 bitmap is represented by an array of 8-byte integers, and the page at PFN #i is
27 mapped to bit #i%64 of array element #i/64, byte order is native. When a bit is
34 the page by writing to the file. A value written to the file is OR-ed with the
43 ``/proc/kpageflags`` in order to correctly count idle huge pages.
46 -EINVAL if you are not starting the read/write on an 8-byte boundary, or
48 this file beyond max PFN will return -ENXIO.
50 That said, in order to estimate the amount of pages that are not used by a
66 The page-types tool in the tools/mm directory can be used to assist in this.
71 See Documentation/admin-guide/mm/pagemap.rst for more information about
79 The kernel internally keeps track of accesses to user memory pages in order to
86  - a userspace process reads or writes a page using a system call (e.g. read(2)
89  - a page that is used for storing filesystem buffers is read or written,
93  - a page is accessed by a device driver using get_user_pages()
117 result noticeably. In order not to stall scanning of the idle page bitmap,