Class: OsCtld::CGroup::ContainerParams

Inherits:
Params
  • Object
show all
Defined in:
lib/osctld/cgroup/container_params.rb

Instance Attribute Summary

Attributes inherited from Params

#owner, #params

Instance Method Summary collapse

Methods inherited from Params

#apply_params, #apply_params_and_retry, #detect, #dump, #dup, #each, #each_usable, #each_version, #find_cpu_limit, #find_memory_limit, #find_swap_limit, #import, #initialize, load, #replace, #reset, #reset_value, #unset, #usable_params

Methods included from Lockable

#exclusively, included, #inclusively, #init_lock, #lock, #unlock

Constructor Details

This class inherits a constructor from OsCtld::CGroup::Params

Instance Method Details

#apply(keep_going: false) ⇒ Object 



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# File 'lib/osctld/cgroup/container_params.rb', line 12

def apply(keep_going: false, &)
  super
  return unless owner.running?

  apply_container_params_and_retry(usable_params, keep_going:, &)
end

#apply_container_params(param_list, keep_going: false) ⇒ Object (protected) 



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# File 'lib/osctld/cgroup/container_params.rb', line 92

def apply_container_params(param_list, keep_going: false)
  failed = []

  param_list.each do |p|
    path = File.join(
      yield(p.subsystem),
      'user-owned',
      "lxc.payload.#{owner.id}",
      p.name
    )

    begin
      failed << p unless CGroup.set_param(path, p.value)
    rescue CGroupFileNotFound
      next
    end
  end

  failed
end

#apply_container_params_and_retry(param_list, keep_going: false) ⇒ Object (protected) 



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# File 'lib/osctld/cgroup/container_params.rb', line 113

def apply_container_params_and_retry(param_list, keep_going: false, &)
  failed = apply_container_params(
    param_list,
    keep_going:,
    &
  ).select { |p| p.name.start_with?('memory.') }

  return unless failed.any?

  apply_container_params(failed, keep_going:, &)
end

#set(*args, **kwargs) ⇒ Object 



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# File 'lib/osctld/cgroup/container_params.rb', line 5

def set(*args, **kwargs)
  owner.exclusively do
    super
    owner.lxc_config.configure_cgparams
  end
end

#temporarily_expand_memory(percent: 50) ⇒ Object

Temporarily expand container memory by given percentage



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# File 'lib/osctld/cgroup/container_params.rb', line 20

def temporarily_expand_memory(percent: 50)
  return unless owner.running?

  if CGroup.v1?
    temporarily_expand_memory_v1(percent:)
  else
    temporarily_expand_memory_v2(percent:)
  end
end

#temporarily_expand_memory_v1(percent:) ⇒ Object (protected) 



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# File 'lib/osctld/cgroup/container_params.rb', line 32

def temporarily_expand_memory_v1(percent:)
  # Determine new memory limits
  mem_limit = each_usable.detect { |p| p.name == 'memory.limit_in_bytes' }
  memsw_limit = each_usable.detect { |p| p.name == 'memory.memsw.limit_in_bytes' }

  tmp_params = [mem_limit, memsw_limit].map do |p|
    next if p.nil?

    cur_limit = p.value.last.to_i
    new_limit = (cur_limit + (cur_limit / 100.0 * percent)).round

    CGroup::Param.new(1, 'memory', p.name, [new_limit], false)
  end

  tmp_params.compact!

  return if tmp_params.empty?

  # Apply new memory limits
  return unless owner.running?

  # First apply them on ct.<id>
  apply_params_and_retry(tmp_params, keep_going: true) do |subsystem|
    owner.abs_apply_cgroup_path(subsystem)
  end

  # Then apply them on lxc.payload
  apply_container_params_and_retry(tmp_params, keep_going: true) do |subsystem|
    owner.abs_apply_cgroup_path(subsystem)
  end

  nil
end

#temporarily_expand_memory_v2(percent:) ⇒ Object (protected) 



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# File 'lib/osctld/cgroup/container_params.rb', line 66

def temporarily_expand_memory_v2(percent:)
  # Determine new memory limit
  memory_max = each_usable.detect { |p| p.name == 'memory.max' }
  return if memory_max.nil?

  cur_limit = memory_max.value.last.to_i
  new_limit = (cur_limit + (cur_limit / 100.0 * percent)).round

  new_param = CGroup::Param.new(2, 'memory', 'memory.max', [new_limit], false)

  # Apply new memory limits
  return unless owner.running?

  # First apply them on ct.<id>
  apply_params_and_retry([new_param], keep_going: true) do |subsystem|
    owner.abs_apply_cgroup_path(subsystem)
  end

  # Then apply them on lxc.payload
  apply_container_params_and_retry([new_param], keep_going: true) do |subsystem|
    owner.abs_apply_cgroup_path(subsystem)
  end

  nil
end