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#!/usr/bin/perl
#
# $NetBSD: netbsd_memory.pl,v 1.2 2014/01/16 21:10:00 tron Exp $
#
# Copyright (c) 2014 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Matthias Scheler.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
use warnings;
use strict;
use POSIX;
# Use vmstat(1) to get memory usage information. "vmstat -s" produces
# output lines like these:
#
# 2034763 pages managed
# 28953 pages free
#
# This function creates a hash using the description as a key to the value.
sub get_vm_stats()
{
my %vm_stats;
my $vmstat_fh;
if (!open($vmstat_fh, '-|', '/usr/bin/vmstat -s')) {
die('Cannot start vmstat.');
}
while (my $line = <$vmstat_fh>) {
$line =~ s/^\s+//;
$line =~ s/\s+$//;
my @words = split(/\s+/, $line, 2);
if (scalar(@words) < 2) {
next;
}
my ($value, $descr) = @words;
$vm_stats{$descr} = $value;
}
close($vmstat_fh);
return %vm_stats;
}
if (scalar(@ARGV) < 1) {
die('Please provide a field name');
}
my $page_size = POSIX::sysconf(&POSIX::_SC_PAGESIZE);
my %vm_stats = get_vm_stats();
# Calculate metrics using the stats reported by vmstat(1).
# Cacti only uses "MemFree" and "SwapFree" at the moment.
my $value = 0;
if ($ARGV[0] =~ 'MemTotal') {
$value = $vm_stats{'pages managed'};
} elsif ($ARGV[0] =~ 'MemFree') {
$value = $vm_stats{'pages free'};
} elsif ($ARGV[0] =~ 'Buffers') {
$value = $vm_stats{'cached file pages'};
} elsif ($ARGV[0] =~ 'Cached') {
$value = $vm_stats{'anonymous pages'} +
$vm_stats{'cached file pages'} +
$vm_stats{'cached executable pages'};
} elsif ($ARGV[0] =~ 'SwapTotal') {
$value = $vm_stats{'swap pages'};
} elsif ($ARGV[0] =~ 'SwapFree') {
$value = $vm_stats{'swap pages'} -
$vm_stats{'swap pages in use'};
}
print $value * ($page_size / 1024);
exit(0);
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