/usr/lib/ruby/vendor_ruby/ohai/plugins/linux/memory.rb is in ohai 6.14.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Author:: Adam Jacob (<adam@opscode.com>)
# Copyright:: Copyright (c) 2008 Opscode, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
provides "memory"
memory Mash.new
memory[:swap] = Mash.new
File.open("/proc/meminfo").each do |line|
case line
when /^MemTotal:\s+(\d+) (.+)$/
memory[:total] = "#{$1}#{$2}"
when /^MemFree:\s+(\d+) (.+)$/
memory[:free] = "#{$1}#{$2}"
when /^Buffers:\s+(\d+) (.+)$/
memory[:buffers] = "#{$1}#{$2}"
when /^Cached:\s+(\d+) (.+)$/
memory[:cached] = "#{$1}#{$2}"
when /^Active:\s+(\d+) (.+)$/
memory[:active] = "#{$1}#{$2}"
when /^Inactive:\s+(\d+) (.+)$/
memory[:inactive] = "#{$1}#{$2}"
when /^HighTotal:\s+(\d+) (.+)$/
memory[:high_total] = "#{$1}#{$2}"
when /^HighFree:\s+(\d+) (.+)$/
memory[:high_free] = "#{$1}#{$2}"
when /^LowTotal:\s+(\d+) (.+)$/
memory[:low_total] = "#{$1}#{$2}"
when /^LowFree:\s+(\d+) (.+)$/
memory[:low_free] = "#{$1}#{$2}"
when /^Dirty:\s+(\d+) (.+)$/
memory[:dirty] = "#{$1}#{$2}"
when /^Writeback:\s+(\d+) (.+)$/
memory[:writeback] = "#{$1}#{$2}"
when /^AnonPages:\s+(\d+) (.+)$/
memory[:anon_pages] = "#{$1}#{$2}"
when /^Mapped:\s+(\d+) (.+)$/
memory[:mapped] = "#{$1}#{$2}"
when /^Slab:\s+(\d+) (.+)$/
memory[:slab] = "#{$1}#{$2}"
when /^SReclaimable:\s+(\d+) (.+)$/
memory[:slab_reclaimable] = "#{$1}#{$2}"
when /^SUnreclaim:\s+(\d+) (.+)$/
memory[:slab_unreclaim] = "#{$1}#{$2}"
when /^PageTables:\s+(\d+) (.+)$/
memory[:page_tables] = "#{$1}#{$2}"
when /^NFS_Unstable:\s+(\d+) (.+)$/
memory[:nfs_unstable] = "#{$1}#{$2}"
when /^Bounce:\s+(\d+) (.+)$/
memory[:bounce] = "#{$1}#{$2}"
when /^CommitLimit:\s+(\d+) (.+)$/
memory[:commit_limit] = "#{$1}#{$2}"
when /^Committed_AS:\s+(\d+) (.+)$/
memory[:committed_as] = "#{$1}#{$2}"
when /^VmallocTotal:\s+(\d+) (.+)$/
memory[:vmalloc_total] = "#{$1}#{$2}"
when /^VmallocUsed:\s+(\d+) (.+)$/
memory[:vmalloc_used] = "#{$1}#{$2}"
when /^VmallocChunk:\s+(\d+) (.+)$/
memory[:vmalloc_chunk] = "#{$1}#{$2}"
when /^SwapCached:\s+(\d+) (.+)$/
memory[:swap][:cached] = "#{$1}#{$2}"
when /^SwapTotal:\s+(\d+) (.+)$/
memory[:swap][:total] = "#{$1}#{$2}"
when /^SwapFree:\s+(\d+) (.+)$/
memory[:swap][:free] = "#{$1}#{$2}"
end
end
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