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authorTao Ma <boyu.mt@taobao.com>2012-04-01 14:33:40 -0700
committerJens Axboe <axboe@kernel.dk>2012-04-01 14:33:40 -0700
commit407ac95e2271a310016ced97f407676e79c53c06 (patch)
treef644750773554011a3cc7cbeebf5f14adf0a79ce /Documentation
parent5bf14c0727a07ded1bd9fa6d77923d7e6dc32833 (diff)
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Documentation: Add sysfs ABI change for cfq's target latency.
Cc: Jens Axboe <axboe@kernel.dk> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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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.
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