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-What: /sys/block/<device>/iosched/target_latency
-Date: March 2012
-contact: Tao Ma <boyu.mt@taobao.com>
-Description:
- The /sys/block/<device>/iosched/target_latency only exists
- when the user sets cfq to /sys/block/<device>/scheduler.
- It contains an estimated latency time for the cfq. cfq will
- use it to calculate the time slice used for every task.