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