projects / thirdparty / man-pages.git / blame
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|---|---|---|
| 5d6be8b1 | 1 | '\" t |
| 68a405e7 AC |
2 | .\" Copyright (C) 1994, 1995, Daniel Quinlan <quinlan@yggdrasil.com> |
| 3 | .\" Copyright (C) 2002-2008, 2017, Michael Kerrisk <mtk.manpages@gmail.com> | |
| 4 | .\" Copyright (C) 2023, Alejandro Colomar <alx@kernel.org> | |
| 5 | .\" | |
| 6 | .\" SPDX-License-Identifier: GPL-3.0-or-later | |
| 7 | .\" | |
| 8 | .TH proc_pid_smaps 5 (date) "Linux man-pages (unreleased)" | |
| 9 | .SH NAME | |
| 10 | /proc/pid/smaps \- XXX: What does 's' in "smaps" stand for? | |
| 11 | .SH DESCRIPTION | |
| 12 | .TP | |
| 13 | .IR /proc/ pid /smaps " (since Linux 2.6.14)" | |
| 14 | This file shows memory consumption for each of the process's mappings. | |
| 15 | (The | |
| 16 | .BR pmap (1) | |
| 17 | command displays similar information, | |
| 18 | in a form that may be easier for parsing.) | |
| 19 | For each mapping there is a series of lines such as the following: | |
| 20 | .IP | |
| 21 | .in +4n | |
| 22 | .EX | |
| 23 | 00400000\-0048a000 r\-xp 00000000 fd:03 960637 /bin/bash | |
| 24 | Size: 552 kB | |
| 25 | Rss: 460 kB | |
| 26 | Pss: 100 kB | |
| 27 | Shared_Clean: 452 kB | |
| 28 | Shared_Dirty: 0 kB | |
| 29 | Private_Clean: 8 kB | |
| 30 | Private_Dirty: 0 kB | |
| 31 | Referenced: 460 kB | |
| 32 | Anonymous: 0 kB | |
| 33 | AnonHugePages: 0 kB | |
| 34 | ShmemHugePages: 0 kB | |
| 35 | ShmemPmdMapped: 0 kB | |
| 36 | Swap: 0 kB | |
| 37 | KernelPageSize: 4 kB | |
| 38 | MMUPageSize: 4 kB | |
| 39 | Locked: 0 kB | |
| 40 | ProtectionKey: 0 | |
| 41 | VmFlags: rd ex mr mw me dw | |
| 42 | .EE | |
| 43 | .in | |
| 44 | .IP | |
| 45 | The first of these lines shows the same information as is displayed | |
| 46 | for the mapping in | |
| 47 | .IR /proc/ pid /maps . | |
| 48 | The following lines show the size of the mapping, | |
| 49 | the amount of the mapping that is currently resident in RAM ("Rss"), | |
| 50 | the process's proportional share of this mapping ("Pss"), | |
| 51 | the number of clean and dirty shared pages in the mapping, | |
| 52 | and the number of clean and dirty private pages in the mapping. | |
| 53 | "Referenced" indicates the amount of memory currently marked as | |
| 54 | referenced or accessed. | |
| 55 | "Anonymous" shows the amount of memory | |
| 56 | that does not belong to any file. | |
| 57 | "Swap" shows how much | |
| 58 | would-be-anonymous memory is also used, but out on swap. | |
| 59 | .IP | |
| 60 | The "KernelPageSize" line (available since Linux 2.6.29) | |
| 61 | is the page size used by the kernel to back the virtual memory area. | |
| 62 | This matches the size used by the MMU in the majority of cases. | |
| 63 | However, one counter-example occurs on PPC64 kernels | |
| 64 | whereby a kernel using 64 kB as a base page size may still use 4 kB | |
| 65 | pages for the MMU on older processors. | |
| 66 | To distinguish the two attributes, the "MMUPageSize" line | |
| 67 | (also available since Linux 2.6.29) | |
| 68 | reports the page size used by the MMU. | |
| 69 | .IP | |
| 70 | The "Locked" indicates whether the mapping is locked in memory | |
| 71 | or not. | |
| 72 | .IP | |
| 73 | The "ProtectionKey" line (available since Linux 4.9, on x86 only) | |
| 74 | contains the memory protection key (see | |
| 75 | .BR pkeys (7)) | |
| 76 | associated with the virtual memory area. | |
| 77 | This entry is present only if the kernel was built with the | |
| 78 | .B CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS | |
| 79 | configuration option (since Linux 4.6). | |
| 80 | .IP | |
| 81 | The "VmFlags" line (available since Linux 3.8) | |
| 82 | represents the kernel flags associated with the virtual memory area, | |
| 83 | encoded using the following two-letter codes: | |
| 84 | .RS | |
| 85 | .IP | |
| 86 | .TS | |
| 87 | l l l. | |
| 88 | rd - readable | |
| 89 | wr - writable | |
| 90 | ex - executable | |
| 91 | sh - shared | |
| 92 | mr - may read | |
| 93 | mw - may write | |
| 94 | me - may execute | |
| 95 | ms - may share | |
| 96 | gd - stack segment grows down | |
| 97 | pf - pure PFN range | |
| 98 | dw - disabled write to the mapped file | |
| 99 | lo - pages are locked in memory | |
| 100 | io - memory mapped I/O area | |
| 101 | sr - sequential read advise provided | |
| 102 | rr - random read advise provided | |
| 103 | dc - do not copy area on fork | |
| 104 | de - do not expand area on remapping | |
| 105 | ac - area is accountable | |
| 106 | nr - swap space is not reserved for the area | |
| 107 | ht - area uses huge tlb pages | |
| 108 | sf - perform synchronous page faults (since Linux 4.15) | |
| 109 | nl - non-linear mapping (removed in Linux 4.0) | |
| 110 | ar - architecture specific flag | |
| 111 | wf - wipe on fork (since Linux 4.14) | |
| 112 | dd - do not include area into core dump | |
| 113 | sd - soft-dirty flag (since Linux 3.13) | |
| 114 | mm - mixed map area | |
| 115 | hg - huge page advise flag | |
| 116 | nh - no-huge page advise flag | |
| 117 | mg - mergeable advise flag | |
| 118 | um - userfaultfd missing pages tracking (since Linux 4.3) | |
| 119 | uw - userfaultfd wprotect pages tracking (since Linux 4.3) | |
| 120 | .TE | |
| 121 | .RE | |
| 122 | .IP | |
| 123 | The | |
| 124 | .IR /proc/ pid /smaps | |
| 125 | file is present only if the | |
| 126 | .B CONFIG_PROC_PAGE_MONITOR | |
| 127 | kernel configuration option is enabled. | |
| 128 | .SH SEE ALSO | |
| 129 | .BR proc (5) |