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Date:	Mon, 9 Nov 2009 14:43:10 +0530
From:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Herbert Poetzl <herbert@...hfloor.at>,
	Avi Kivity <avi@...hat.com>,
	Chris Friesen <cfriesen@...tel.com>,
	Paul Menage <menage@...gle.com>,
	Mike Waychison <mikew@...gle.com>
Subject: [RFC v3 PATCH 7/7] sched: Hard limits documentation

sched: Hard limits documentation

From: Bharata B Rao <bharata@...ux.vnet.ibm.com>

Documentation for hard limits feature.

Signed-off-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
---
 Documentation/scheduler/sched-cfs-hard-limits.txt |   48 +++++++++++++++++++++
 1 files changed, 48 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/scheduler/sched-cfs-hard-limits.txt

diff --git a/Documentation/scheduler/sched-cfs-hard-limits.txt b/Documentation/scheduler/sched-cfs-hard-limits.txt
new file mode 100644
index 0000000..d6387af
--- /dev/null
+++ b/Documentation/scheduler/sched-cfs-hard-limits.txt
@@ -0,0 +1,48 @@
+CPU HARD LIMITS FOR CFS GROUPS
+==============================
+
+1. Overview
+2. Interface
+3. Examples
+
+1. Overview
+-----------
+
+CFS is a proportional share scheduler which tries to divide the CPU time
+proportionately between tasks or groups of tasks (task group/cgroup) depending
+on the priority/weight of the task or shares assigned to groups of tasks.
+In CFS, a task/task group can get more than its share of CPU if there are
+enough idle CPU cycles available in the system, due to the work conserving
+nature of the scheduler. However in certain scenarios (like pay-per-use),
+it is desirable not to provide extra time to a group even in the presence
+of idle CPU cycles. This is where hard limiting can be of use.
+
+Hard limits for task groups can be set by specifying how much CPU runtime a
+group can consume within a given period. If the group consumes more CPU time
+than the runtime in a given period, it gets throttled. None of the tasks of
+the throttled group gets to run until the runtime of the group gets refreshed
+at the beginning of the next period.
+
+2. Interface
+------------
+
+Hard limit feature adds 2 cgroup files for CFS group scheduler:
+
+cfs_runtime_us: Hard limit for the group in microseconds.
+
+cfs_period_us: Time period in microseconds within which hard limits is
+enforced.
+
+A group gets created with default values for runtime (infinite runtime which
+means hard limits disabled) and period (0.5s). Each group can set its own
+values for runtime and period independent of other groups in the system.
+
+3. Examples
+-----------
+
+# mount -t cgroup -ocpu none /cgroups/
+# cd /cgroups
+# mkdir 1
+# cd 1/
+# echo 250000 > cfs_runtime_us /* set a 250ms runtime or limit */
+# echo 500000 > cfs_period_us /* set a 500ms period */
--
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