Name
/proc/kpageflags - physical pages frame masksDescription
/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 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)