In section <2. Runtime Cost>, fix wrong index.
Signed-off-by: Nzhenwei.pi <zhenwei.pi@youruncloud.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: dave.hansen@linux.intel.com
Link: https://lkml.kernel.org/r/1516237492-27739-1-git-send-email-zhenwei.pi@youruncloud.com