'\" t .\" Copyright (C) 1994, 1995, Daniel Quinlan .\" Copyright (C) 2002-2008, 2017, Michael Kerrisk .\" Copyright (C) 2023, Alejandro Colomar .\" .\" SPDX-License-Identifier: GPL-3.0-or-later .\" .TH proc_kpageflags 5 2024-05-02 "Linux man-pages 6.8" .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)