# Memory Eviction

SketchSystems.spec

# Memory Eviction

Start*
  swap page -> NoRW
  file page -> NoRW

NoRW
  read -> Read
  write -> ReadWrite
  queue -> Start
  
Read
  write -> ReadWrite
  queue -> NoRW

ReadWrite
  queue -> NoRW

SketchSystems_prototype.js

let dirty = false;
function render(model) {
  let current_state_name = model.active_states[0].name;
  if (current_state_name === "ReadWrite") {
    dirty = true;
  } else if (current_state_name === "Start") {
    dirty = false; 
  }
  let referenced = current_state_name === "Read" ||
      current_state_name === "ReadWrite";
  
  return $("ul",
    $("li", `State: ${current_state_name}`),
    $("li", `Dirty: ${dirty}`),
    $("li", `Referenced: ${referenced}`),
  );
}