From: Tao Ma <boyu.mt@taobao.com>
Date: Sun, 1 Apr 2012 21:33:40 +0000 (-0700)
Subject: Documentation: Add sysfs ABI change for cfq's target latency.
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=407ac95e2271a310016ced97f407676e79c53c06;p=linux-beck.git

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>
---

diff --git a/Documentation/ABI/testing/sysfs-cfq-target-latency b/Documentation/ABI/testing/sysfs-cfq-target-latency
new file mode 100644
index 000000000000..df0f7828c5e3
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-cfq-target-latency
@@ -0,0 +1,8 @@
+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.