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'\" t
.\" Copyright (C) 1994, 1995, Daniel Quinlan <quinlan@yggdrasil.com>
.\" Copyright (C) 2002-2008, 2017, Michael Kerrisk <mtk.manpages@gmail.com>
.\" Copyright (C) 2023, Alejandro Colomar <alx@kernel.org>
.\"
.\" SPDX-License-Identifier: GPL-3.0-or-later
.\"
.TH proc_kpageflags 5 (date) "Linux man-pages (unreleased)"
.SH NAME
/proc/kpageflags \- physical pages frame masks
.SH DESCRIPTION
.TP
.IR /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
.IR /proc/ pid /pagemap ).
The bits are as follows:
.RS
.IP
.TS
r l l l.
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)
.\" KPF_BALLOON: commit 09316c09dde33aae14f34489d9e3d243ec0d5938
24 - KPF_ZERO_PAGE (since Linux 4.0)
.\" KPF_ZERO_PAGE: commit 56873f43abdcd574b25105867a990f067747b2f4
25 - KPF_IDLE (since Linux 4.3)
.\" KPF_IDLE: commit f074a8f49eb87cde95ac9d040ad5e7ea4f029738
26 - KPF_PGTABLE (since Linux 4.18)
.\" KPF_PGTABLE: commit 1d40a5ea01d53251c23c7be541d3f4a656cfc537
.TE
.RE
.IP
For further details on the meanings of these bits,
see the kernel source file
.IR Documentation/admin\-guide/mm/pagemap.rst .
Before Linux 2.6.29,
.\" commit ad3bdefe877afb47480418fdb05ecd42842de65e
.\" commit e07a4b9217d1e97d2f3a62b6b070efdc61212110
.BR KPF_WRITEBACK ,
.BR KPF_RECLAIM ,
.BR KPF_BUDDY ,
and
.B KPF_LOCKED
did not report correctly.
.IP
The
.I /proc/kpageflags
file is present only if the
.B CONFIG_PROC_PAGE_MONITOR
kernel configuration option is enabled.
.SH SEE ALSO
.BR proc (5)
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