gistfile1.rb

#!/usr/bin/env ruby

require 'json'

VERBOSE = (ARGV.include? '-v')

rules = JSON::parse(File.read('/etc/oomsaver.json')).collect do |re, score|
  [Regexp.new(re), score]
end

Dir['/proc/[0-9]*'].each do |dir|
  begin
    comm = File.read(File.join(dir, 'comm')).strip
    cmdline = File.read(File.join(dir, 'cmdline')).gsub('\0', ' ').strip
    descr = "#{comm}@#{cmdline}"

    _, score = rules.find {|reg, _| reg === descr}

    if score
      puts "#{descr} matches" if VERBOSE

      adj_path = File.join(dir, 'oom_score_adj')
      old_score = File.read(adj_path).to_i
      unless score == old_score
        File.write adj_path, score
        puts "Adjusted #{descr} (#{File.basename dir}) to #{score}"
      end

    else
      puts "#{descr} doesn't match" if VERBOSE
    end
  rescue
    # PIDs come and go
  end
end