/usr/share/perl5/Sys/Statistics/Linux/MemStats.pm is in libsys-statistics-linux-perl 0.66-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 | =head1 NAME
Sys::Statistics::Linux::MemStats - Collect linux memory information.
=head1 SYNOPSIS
use Sys::Statistics::Linux::MemStats;
my $lxs = Sys::Statistics::Linux::MemStats->new;
my $stat = $lxs->get;
=head1 DESCRIPTION
Sys::Statistics::Linux::MemStats gathers memory statistics from the virtual F</proc> filesystem (procfs).
For more information read the documentation of the front-end module L<Sys::Statistics::Linux>.
=head1 MEMORY INFORMATIONS
Generated by F</proc/meminfo>.
memused - Total size of used memory in kilobytes.
memfree - Total size of free memory in kilobytes.
memusedper - Total size of used memory in percent.
memtotal - Total size of memory in kilobytes.
buffers - Total size of buffers used from memory in kilobytes.
cached - Total size of cached memory in kilobytes.
realfree - Total size of memory is real free (memfree + buffers + cached).
realfreeper - Total size of memory is real free in percent of total memory.
swapused - Total size of swap space is used is kilobytes.
swapfree - Total size of swap space is free in kilobytes.
swapusedper - Total size of swap space is used in percent.
swaptotal - Total size of swap space in kilobytes.
swapcached - Memory that once was swapped out, is swapped back in but still also is in the swapfile.
active - Memory that has been used more recently and usually not reclaimed unless absolutely necessary.
inactive - Memory which has been less recently used and is more eligible to be reclaimed for other purposes.
On earlier kernels (2.4) Inact_dirty + Inact_laundry + Inact_clean.
The following statistics are only available by kernels from 2.6.
slab - Total size of memory in kilobytes that used by kernel for data structure allocations.
dirty - Total size of memory pages in kilobytes that waits to be written back to disk.
mapped - Total size of memory in kilbytes that is mapped by devices or libraries with mmap.
writeback - Total size of memory that was written back to disk.
committed_as - The amount of memory presently allocated on the system.
The following statistic is only available by kernels from 2.6.9.
commitlimit - Total amount of memory currently available to be allocated on the system.
=head1 METHODS
=head2 new()
Call C<new()> to create a new object.
my $lxs = Sys::Statistics::Linux::MemStats->new;
It's possible to set the path to the proc filesystem.
Sys::Statistics::Linux::MemStats->new(
files => {
# This is the default
path => '/proc',
meminfo => 'meminfo',
}
);
=head2 get()
Call C<get()> to get the statistics. C<get()> returns the statistics as a hash reference.
my $stat = $lxs->get;
=head1 EXPORTS
No exports.
=head1 SEE ALSO
B<proc(5)>
=head1 REPORTING BUGS
Please report all bugs to <jschulz.cpan(at)bloonix.de>.
=head1 AUTHOR
Jonny Schulz <jschulz.cpan(at)bloonix.de>.
=head1 COPYRIGHT
Copyright (c) 2006, 2007 by Jonny Schulz. All rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
=cut
package Sys::Statistics::Linux::MemStats;
use strict;
use warnings;
use Carp qw(croak);
our $VERSION = '0.16';
sub new {
my $class = shift;
my $opts = ref($_[0]) ? shift : {@_};
my %self = (
files => {
path => '/proc',
meminfo => 'meminfo',
}
);
foreach my $file (keys %{ $opts->{files} }) {
$self{files}{$file} = $opts->{files}->{$file};
}
return bless \%self, $class;
}
sub get {
my $self = shift;
my $class = ref($self);
my $file = $self->{files};
my %meminfo = ();
my $filename = $file->{path} ? "$file->{path}/$file->{meminfo}" : $file->{meminfo};
open my $fh, '<', $filename or croak "$class: unable to open $filename ($!)";
# MemTotal: 1035648 kB
# MemFree: 15220 kB
# Buffers: 4280 kB
# Cached: 47664 kB
# SwapCached: 473988 kB
# Active: 661992 kB
# Inactive: 314312 kB
# HighTotal: 130884 kB
# HighFree: 264 kB
# LowTotal: 904764 kB
# LowFree: 14956 kB
# SwapTotal: 1951856 kB
# SwapFree: 1164864 kB
# Dirty: 520 kB
# Writeback: 0 kB
# AnonPages: 908892 kB
# Mapped: 34308 kB
# Slab: 19284 kB
# SReclaimable: 7532 kB
# SUnreclaim: 11752 kB
# PageTables: 3056 kB
# NFS_Unstable: 0 kB
# Bounce: 0 kB
# CommitLimit: 2469680 kB
# Committed_AS: 1699568 kB
# VmallocTotal: 114680 kB
# VmallocUsed: 12284 kB
# VmallocChunk: 100992 kB
# kernel <= 2.4
# Inact_dirty: 138632 kB
# Inact_laundry: 35520 kB
# Inact_clean: 7544 kB
while (my $line = <$fh>) {
if ($line =~ /^((?:Mem|Swap)(?:Total|Free)|Buffers|Cached|SwapCached|Active|Inactive|
Dirty|Writeback|Mapped|Slab|Commit(?:Limit|ted_AS)):\s*(\d+)/x) {
my ($n, $v) = ($1, $2);
$n =~ tr/A-Z/a-z/;
$meminfo{$n} = $v;
} elsif ($line =~ /^Inact_(?:dirty|laundry|clean):\s*(\d+)/) {
$meminfo{inactive} += $1;
}
}
close($fh);
$meminfo{memused} = sprintf('%u', $meminfo{memtotal} - $meminfo{memfree});
$meminfo{memusedper} = sprintf('%.2f', 100 * $meminfo{memused} / $meminfo{memtotal});
$meminfo{swapused} = sprintf('%u', $meminfo{swaptotal} - $meminfo{swapfree});
$meminfo{realfree} = sprintf('%u', $meminfo{memfree} + $meminfo{buffers} + $meminfo{cached});
$meminfo{realfreeper} = sprintf('%.2f', 100 * $meminfo{realfree} / $meminfo{memtotal});
# maybe there is no swap space on the machine
if (!$meminfo{swaptotal}) {
$meminfo{swapusedper} = '0.00';
} else {
$meminfo{swapusedper} = sprintf('%.2f', 100 * $meminfo{swapused} / $meminfo{swaptotal});
}
return \%meminfo;
}
1;
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