Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1564317

[PATCH] sched: Documentation: sched-rt-group: fix example error

Show all headers | View raw

I feel that the example given in the document to show the possibility
of task starvation of configurable period is wrong.

The example says group A and B both have 50% bandwidth, and a while (1)
loop in A will run for the full period of B and can starve B's tasks.

So I think the runtime of group A should be 50000us, then the period and
runtime of group B should be 50000us and 25000us.

Signed-off-by: Zhou Chengming <zhouchengming1@huawei.com>
---
 Documentation/scheduler/sched-rt-group.txt |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/Documentation/scheduler/sched-rt-group.txt b/Documentation/scheduler/sched-rt-group.txt
index a03f0d9..d8fce3e 100644
--- a/Documentation/scheduler/sched-rt-group.txt
+++ b/Documentation/scheduler/sched-rt-group.txt
@@ -158,11 +158,11 @@ as its prone to starvation without deadline scheduling.
 Consider two sibling groups A and B; both have 50% bandwidth, but A's
 period is twice the length of B's.
 
-* group A: period=100000us, runtime=10000us
-	- this runs for 0.01s once every 0.1s
+* group A: period=100000us, runtime=50000us
+	- this runs for 0.05s once every 0.1s
 
-* group B: period= 50000us, runtime=10000us
-	- this runs for 0.01s twice every 0.1s (or once every 0.05 sec).
+* group B: period= 50000us, runtime=25000us
+	- this runs for 0.025s twice every 0.1s (or once every 0.05 sec).
 
 This means that currently a while (1) loop in A will run for the full period of
 B and can starve B's tasks (assuming they are of lower priority) for a whole
-- 
1.7.7

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH] sched: Documentation: sched-rt-group: fix example error Zhou Chengming <zhouchengming1@huawei.com> - 2017-01-22 08:30 +0100
  [tip:sched/core] sched/Documentation/sched-rt-group: Fix incorrect  example tip-bot for Zhou Chengming <tipbot@zytor.com> - 2017-01-22 11:20 +0100

csiph-web