Documentation: Add sysfs ABI change for cfq's target latency.
[linux-2.6.git] / Documentation / ABI / testing / sysfs-cfq-target-latency
1 What:           /sys/block/<device>/iosched/target_latency
2 Date:           March 2012
3 contact:        Tao Ma <boyu.mt@taobao.com>
4 Description:
5                 The /sys/block/<device>/iosched/target_latency only exists
6                 when the user sets cfq to /sys/block/<device>/scheduler.
7                 It contains an estimated latency time for the cfq. cfq will
8                 use it to calculate the time slice used for every task.