Linux cli command proc_kpageflags

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command proc_kpageflags and provides detailed information about the command proc_kpageflags, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the proc_kpageflags.

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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 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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