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Subject[PATCH v2] sched/Documentation: Add RT_RUNTIME_SHARE documentation
Date
RT_RUNTIME_SHARE is an important strategy for rt bandwidth, and
we should document this sched feature.

Signed-off-by: Zhang Qiao <zhangqiao22@huawei.com>
Improvements-suggested-by: Bagas Sanjaya <bagasdotme@gmail.com>
---
Documentation/scheduler/sched-rt-group.rst | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/Documentation/scheduler/sched-rt-group.rst b/Documentation/scheduler/sched-rt-group.rst
index d685609ed3d7..eea2fc6f068f 100644
--- a/Documentation/scheduler/sched-rt-group.rst
+++ b/Documentation/scheduler/sched-rt-group.rst
@@ -12,6 +12,7 @@ Real-Time group scheduling
2.1 System-wide settings
2.2 Default behaviour
2.3 Basis for grouping tasks
+ 2.4 RT_RUNTIME_SHARE sched feature
3. Future plans


@@ -146,6 +147,17 @@ For now, this can be simplified to just the following (but see Future plans):

\Sum_{i} runtime_{i} <= global_runtime

+2.4 RT_RUNTIME_SHARE sched feature
+----------------------------------
+
+RT_RUNTIME_SHARE allows a cpu to borrow rt-runtime from other cpus if it runs
+out of its own rt-runtime.
+
+With this feature enabled, a rt-task may hit 100% cpu usage and can stall other
+per-cpu tasks like kworkers, as a result, which leads into system hang.
+
+Thus, it is advised to disable this feature by default to avoid aforementioned
+issue unless you know what you're doing.

3. Future plans
===============
--
2.18.0.huawei.25

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