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proc_kpageflags
Section: File Formats (5) Updated: 202-0-08 Index
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NAME
/proc/kpageflags - physical pages frame masks
DESCRIPTION
- /proc/kpageflags (since Linux 2.6.25)
-
This file contains 6-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 follows:
-
-
| 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)
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