class Process::Metrics::Memory::Linux

def self.capture(pid, **options)
	usage = Memory.zero
	
	begin
		File.foreach("/proc/#{pid}/smaps_rollup") do |line|
			if /(?<name>.*?):\s+(?<value>\d+) kB/ =~ line
				if key = SMAP[name]
					usage[key] += value.to_i
				end
			end
		end
		
		usage.map_count += File.readlines("/proc/#{pid}/maps").size
	rescue Errno::ENOENT => error
		# Ignore.
	end
	
	return usage
end