18c2ecf20Sopenharmony_ciWhat:		/sys/block/<device>/iosched/target_latency
28c2ecf20Sopenharmony_ciDate:		March 2012
38c2ecf20Sopenharmony_cicontact:	Tao Ma <boyu.mt@taobao.com>
48c2ecf20Sopenharmony_ciDescription:
58c2ecf20Sopenharmony_ci		The /sys/block/<device>/iosched/target_latency only exists
68c2ecf20Sopenharmony_ci		when the user sets cfq to /sys/block/<device>/scheduler.
78c2ecf20Sopenharmony_ci		It contains an estimated latency time for the cfq. cfq will
88c2ecf20Sopenharmony_ci		use it to calculate the time slice used for every task.
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