Class: Tweek::Section

Inherits:
Array
  • Object
show all
Defined in:
lib/tweek/section.rb

Overview

A section is an array of lines, each line is an Entry The section line itself is stored in a separate Entry object

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(twf, entry) ⇒ Section

Returns a new instance of Section.



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# File 'lib/tweek/section.rb', line 8

def initialize twf, entry
  @twf = twf
  @section_entry = entry
end

Instance Attribute Details

#section_entry ⇒ Object (readonly)

Returns the value of attribute section_entry.



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# File 'lib/tweek/section.rb', line 6

def section_entry
  @section_entry
end

#twf ⇒ Object (readonly)

Returns the value of attribute twf.



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# File 'lib/tweek/section.rb', line 6

def twf
  @twf
end

Class Method Details

.initial(twf) ⇒ Object

Return an initial section used to hold anything (such as comments) prior to the first real section



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# File 'lib/tweek/section.rb', line 15

def self.initial twf
  Tweek::Section.new(twf, Tweek::Entry.new(self, :section, :section_type => :initial) )
end

Instance Method Details

#each_entry(&block) ⇒ Object

Helper method to easily iterate through each actionable entry in the section.



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# File 'lib/tweek/section.rb', line 21

def each_entry &block
  self.each do |entry|
    case entry.type
    when :literal
      @twf.generate entry
    when :parameter
      begin
        if entry.condfail
          @twf.generate entry
        else
          yield entry if block_given?
        end
      rescue Exception => e
        @twf.error e.message, entry.lineno
        STDERR.puts "#{e.message}\n#{e.backtrace.join("\n")}" if ENV['DEBUG_TWEEK']
      end
    else
      raise "Unknown entry type: #{entry.type}"
    end
  end
end

#handle_irqs(netdev, entry) ⇒ Object 



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# File 'lib/tweek/section.rb', line 222

def handle_irqs netdev, entry
  irqs = Tweek.irqs(netdev)

  if irqs.empty?
    @twf.warn "#{netdev} IRQ check skipped: none found", entry.lineno
    entry.actual = 'null'
    return
  end

  ncores = Tweek.ncores
  mismatches = 0
  expected_rps = []
  expected_rss = []
  irqs.each_with_index do |irq, ix|
    case entry.value
    when 'null','none','ignore'
      next

    when 'aws'
      case ncores
      when 8..64
        expected_rps << ("00000000," * 3) + "0000ff00"
        expected_rss << ("00000000," * 3) + sprintf("%08x", 1<<ix)
      when 1..8
        expected_rps << "0000"
        expected_rss << sprintf("%04x", 1<<ix)
      else
        @twf.warn "#{netdev} IRQ strategy '#{entry.value}' can't handle #{ncores} cores", entry.lineno
        return
      end

    when 'pin'
      case ncores
      when 1..8 # not a lot of choice
        expected_rps << "0000"
        expected_rss << "0001"

      when 8..32 # RPS on cores 10-15 and 18-31, RSS tied to 0-7
        case ix
        when 0..7
          expected_rps << ("00000000," * 3) + "fffefe00"
          expected_rss << ("00000000," * 3) + sprintf("%08x", 1<<(ix+1))
        else
          @twf.warn "#{netdev} IRQ strategy '#{entry.value}' can't handle IRQ#{ix}", entry.lineno
          return
        end

      when 32..64 # Split the work across the two nodes
        case ix
        when 0..3 # alloc on node 0 (cpus 0-3)
          expected_rps << ("00000000," * 2) + "0000ffff," + "0000ffe0"
          expected_rss << ("00000000," * 3) + sprintf("%08x", 1<<(ix+1))
        when 4..7 # alloc on node 1 (
          expected_rps << ("00000000," * 2) + "ffff0000," + "ffe00000"
          expected_rss << ("00000000," * 3) + sprintf("%08x", 1<<(ix + 9))
        else
          @twf.warn "#{netdev} IRQ strategy '#{entry.value}' can't handle IRQ#{ix}", entry.lineno
          return
        end

      else
        @twf.error "Can't handle #{ncores} cores in IRQ strategy '#{entry.value}'", entry.lineno
        return
      end

    else
      @twf.error "Unrecognized #{netdev} IRQ strategy '#{entry.value}'", entry.lineno
      return
    end
  end
  rss = [] # sadly map.with_index doesn't work in 1.8.7, no other compatible way
  irqs.each_with_index do |irq, ix|
    rss << Tweek::Entry.new(self, :parameter, :param => "#{netdev}_irq_#{irq}_rss",
                            :actual => Tweek.net_rss(irq),
                            :value => expected_rss[ix])
  end
  rps = []
  irqs.each_with_index do |irq, ix|
    rps << Tweek::Entry.new(self, :parameter, :param => "#{netdev}_irq_rx-#{ix}_rps",
                            :actual => Tweek.net_rps(netdev, ix),
                            :value => expected_rps[ix])
  end
  mismatches = rss.reduce(0){|sum, r| sum += 1 if r.mismatch}
  mismatches += rps.reduce(0){|sum, r| sum += 1 if r.mismatch}
  entry.actual = 'explicit' if mismatches > 0
  @twf.generate entry
  (rss+rps).each {|e| @twf.generate e}
  return
end

#process ⇒ Object 



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# File 'lib/tweek/section.rb', line 43

def process

  return if self.empty?

  case section_entry.section_type

  when :initial
    self.each do |entry|
      case entry.type
      when :literal
        @twf.generate entry
      else
        @twf.warn "Parameter line ignored outside section", entry.lineno
      end
    end

  when :BLKDEV # BLOCK DEVICE PARAMETERS
    @twf.warn "Set/Reset is not currently implemented for #{section_entry.section_type} section" if [:set, :reset].include? @twf.mflag
    Dir.chdir('/dev')
    devices = Dir.glob(section_entry.list.split(' ').map{|dev| dev.gsub(/^\/dev\//,'')})
    @twf.warn("Block device check skipped: no devices found", section_entry.lineno) if devices.empty?
    devices.each do |blk|
      section_entry.list_element = blk
      @twf.generate section_entry
      each_entry do |entry|
        entry.actual = Tweek.blk_param(blk, entry.param)
        if entry.param == 'scheduler'
          entry.actual = entry.actual.slice(/\[(.*?)\]/,1) unless entry.actual == 'none'
        end
        @twf.generate entry
      end
    end

  when :KERNEL # KERNEL PARAMETERS
    @twf.warn "Set/Reset is not currently implemented for #{section_entry.section_type} section" if [:set, :reset].include? @twf.mflag
    @twf.generate section_entry
    each_entry do |entry|
      actual = /\b(#{entry.param})(=\S+)?\b/.match(Tweek.bootline)
      case
      when (entry.value == 'true' and actual)
        entry.actual = actual[2].nil? ? 'true' : actual[2][1..-1]
      when (entry.value == 'true' and actual.nil?)
        entry.actual = 'false'
      when (entry.value == 'false' and actual)
        entry.actual = 'true'
      when (entry.value == 'false' and actual.nil?)
        entry.actual = 'false'
      else
       entry.actual = actual.nil? ? 'false' : actual[2][1..-1]
      end
      @twf.generate entry
    end

  when :CLOCKSOURCE
    @twf.warn "Set/Reset is not currently implemented for #{section_entry.section_type} section" if [:set, :reset].include? @twf.mflag
    @twf.generate section_entry
    each_entry do |entry|
      entry.actual = Tweek.clocksource(entry.param)
      @twf.generate entry
    end

  when :SYSCTL # SYSCTL SETTINGS
    @twf.generate section_entry
    each_entry do |entry|
      file = entry.param.gsub(/\./,'/')
      entry.actual = Tweek.sysctl(file)
      case @twf.mflag
      when :set
        entry.value = Tweek.set_sysctl(file, entry.value)
        entry.mode = :set
      when :reset
        if entry.was
          if entry.actual == entry.value
            entry.value = Tweek.set_sysctl(file, entry.was)
            entry.mode = :reset
          else
            @twf.warn "Current value of #{entry.param.bold} does not match, cannot reset", entry.lineno
          end
        else
          @twf.warn "Previous value of #{entry.param.bold} not found, cannot reset", entry.lineno
        end
      end
      @twf.generate entry
    end

  when :NET  # NETWORK DEVICES
    @twf.warn "Set/Reset is not currently implemented for #{section_entry.section_type} section" if [:set, :reset].include? @twf.mflag
    devices = section_entry.list.split(' ').map{|dev| dev.gsub(/^\/dev\//,'')}
    @twf.warn("Network device check skipped: no devices found", section_entry.lineno) if devices.empty?

    devices.each do |netdev|
      unless Tweek.net_dev_exist? netdev
        @twf.warn("NET device #{netdev} not found", section_entry.lineno)
        next
      end
      section_entry.list_element = netdev
      @twf.generate section_entry
      each_entry do |entry|

 case entry.param
 when 'driver'
          entry.actual = Tweek.net_driver(netdev)
          @twf.generate entry

 when 'irqs'
          balpid = Tweek.balance_pid
          if entry.value == 'balance'
            entry.actual = balpid.zero? ? 'IRQ balance daemon not running' : 'balance'
          else
            if balpid.zero?
              handle_irqs(netdev, entry)
            else
              entry.actual = 'IRQ balance daemon running'
              @twf.generate entry
            end
          end

 else # treat the parameter as a name
          entry.actual = Tweek.net_param(netdev, entry.param)
          @twf.generate entry
        end

      end
    end

  when :EXT4 # EXT4 filesystems info via `dumpe2fs -h /dev/#{device}`
    @twf.warn "Set/Reset is not currently implemented for #{section_entry.section_type} section" if [:set, :reset].include? @twf.mflag
    mounted = Tweek.mounted
    mounts = Dir.glob(section_entry.list.split(' '))
    @twf.warn("EXT4 check skipped: no mountpoints found", section_entry.lineno) if mounts.empty?
    mounts.each do |mount|
      unless this = mounted.select{|m| (mount == m[0] or mount == m[1]) and m[2] == 'ext4'}.first
        @twf.warn "EXT4 path #{mount} is not mounted or is not mounted as ext4", section_entry.lineno
        next
      end
      section_entry.list_element = mount
      @twf.generate section_entry
      device = this[0].gsub('/dev/','')
      optstring = File.open("/proc/fs/ext4/#{device}/options",&:read)
      options = Hash[optstring.scan(/([^=\s]+)=([^=\s,]+)/)] # options a=b
      optstring.split(/\n/).reject{|o| o.index('=')}.each{|o| options[o] = 'true'}
      each_entry do |entry|
        entry.actual = options[entry.param] || "<not found>"
        @twf.generate entry
      end
    end

  when :XFS # XFS filesystems info  via `xfs_info`
    @twf.warn "Set/Reset is not currently implemented for #{section_entry.section_type} section" if [:set, :reset].include? @twf.mflag
    # Dynamically via: /proc/fs/xfs/... ?
    mounts = section_entry.list.split(' ')
    @twf.warn("XFS device check skipped: no mountpoints found", section_entry.lineno) if mounts.empty?
    mounts.each do |mount|
      xfsinfo = Tweek.xfsinfo(mount)
      unless xfsinfo
        @twf.warn "No XFS filesystem at #{mount}", section_entry.lineno
        next
      end
      section_entry.list_element = mount
      @twf.generate section_entry
      data = Hash[xfsinfo.slice!(/^meta-data.*(?=^naming)/m).scan(/([^=\s]+)=([^=\s,]+)/)]
      naming = Hash[xfsinfo.slice!(/^naming.*(?=^log)/m).scan(/([^=\s]+)=([^=\s,]+)/)]
      log = Hash[xfsinfo.slice!(/^log.*(?=^realtime)/m).scan(/([^=\s]+)=([^=\s,]+)/)]
      realtime = Hash[xfsinfo.slice!(/^realtime.*$/m).scan(/([^=\s]+)=([^=\s,]+)/)]
      xfsparms = { 'data' => data, 'naming' => naming, 'log' => log, 'realtime' => realtime }

      each_entry do |entry|
        parameter = entry.param.split('.',2)
        entry.actual = xfsparms[parameter[0]][parameter[1]] rescue "<invalid name>"
        @twf.generate entry
      end
    end

  else
    @twf.error "Unknown type #{section_entry.section_type}", section_entry.lineno
  end

end