理解CPU steal time

http://melody-dc.com/2015/11/21/%E7%90%86%E8%A7%A3CPU-steal-time/

http://www.cnblogs.com/yjf512/p/3383915.html

http://blog.scoutapp.com/articles/2013/07/25/understanding-cpu-steal-time-when-should-you-be-worried