proc_kpageflags

proc_kpageflags(5) File Formats Manual proc_kpageflags(5)

NAME

   /proc/kpageflags - physical pages frame masks

DESCRIPTION

   /proc/kpageflags (since Linux 2.6.25)
          This  file  contains 64-bit masks corresponding to each physical page frame; it is indexed by page frame number (see the discussion of /proc/pid/pagemap).  The bits are as fol
          lows:

                  0   -   KPF_LOCKED
                  1   -   KPF_ERROR
                  2   -   KPF_REFERENCED
                  3   -   KPF_UPTODATE
                  4   -   KPF_DIRTY
                  5   -   KPF_LRU
                  6   -   KPF_ACTIVE
                  7   -   KPF_SLAB
                  8   -   KPF_WRITEBACK
                  9   -   KPF_RECLAIM
                 10   -   KPF_BUDDY
                 11   -   KPF_MMAP            (since Linux 2.6.31)
                 12   -   KPF_ANON            (since Linux 2.6.31)
                 13   -   KPF_SWAPCACHE       (since Linux 2.6.31)
                 14   -   KPF_SWAPBACKED      (since Linux 2.6.31)
                 15   -   KPF_COMPOUND_HEAD   (since Linux 2.6.31)
                 16   -   KPF_COMPOUND_TAIL   (since Linux 2.6.31)
                 17   -   KPF_HUGE            (since Linux 2.6.31)
                 18   -   KPF_UNEVICTABLE     (since Linux 2.6.31)
                 19   -   KPF_HWPOISON        (since Linux 2.6.31)
                 20   -   KPF_NOPAGE          (since Linux 2.6.31)
                 21   -   KPF_KSM             (since Linux 2.6.32)
                 22   -   KPF_THP             (since Linux 3.4)
                 23   -   KPF_BALLOON         (since Linux 3.18)
                 24   -   KPF_ZERO_PAGE       (since Linux 4.0)
                 25   -   KPF_IDLE            (since Linux 4.3)
                 26   -   KPF_PGTABLE         (since Linux 4.18)

          For further details on the meanings of these bits, see the kernel source  file  Documentation/admin-guide/mm/pagemap.rst.   Before  Linux  2.6.29,  KPF_WRITEBACK,  KPF_RECLAIM,
          KPF_BUDDY, and KPF_LOCKED did not report correctly.

          The /proc/kpageflags file is present only if the CONFIG_PROC_PAGE_MONITOR kernel configuration option is enabled.

SEE ALSO

   proc(5)

Linux man-pages 6.9.1 2024-05-02 proc_kpageflags(5)