linux.git/Documentation/scheduler, branch v4.11

sched/Documentation/sched-rt-group: Fix incorrect example

2017-01-22T09:34:17+00:00

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 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: corbet@lwn.net
Cc: iamyooon@gmail.com
Cc: linux-doc@vger.kernel.org
Cc: lizefan@huawei.com
Link: http://lkml.kernel.org/r/1485069755-44287-1-git-send-email-zhouchengming1@huawei.com
Signed-off-by: Ingo Molnar

sched/deadline: Show leftover runtime and abs deadline in /proc/*/sched

2017-01-14T10:30:00+00:00

This patch allows for reading the current (leftover) runtime and
absolute deadline of a SCHED_DEADLINE task through /proc/*/sched
(entries dl.runtime and dl.deadline), while debugging/testing.

Signed-off-by: Tommaso Cucinotta 
Signed-off-by: Peter Zijlstra (Intel) 
Reviewed-by: Juri Lelli 
Reviewed-by: Luca Abeni 
Acked-by: Daniel Bistrot de Oliveira 
Cc: Juri Lelli 
Cc: Linus Torvalds 
Cc: Mike Galbraith 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Link: http://lkml.kernel.org/r/1477473437-10346-2-git-send-email-tommaso.cucinotta@sssup.it
Signed-off-by: Ingo Molnar

docs/completion.txt: drop dangling reference to completions-design.txt

2016-11-16T23:27:50+00:00

Per the original author, the proposed document was never deemed
necessary, and the important bits got merged into completion.txt. Let's
just stop confusing readers by pointing at a nonexistent doc.

Signed-off-by: Brian Norris 
Signed-off-by: Jonathan Corbet

sched/deadline: Document behavior of sched_yield()

2016-09-10T09:17:41+00:00

This is a documentation only patch, explaining the
behavior of sched_yield() when a SCHED_DEADLINE
task calls it (give up remaining runtime and be
throttled until next period begins).

Signed-off-by: Tommaso Cucinotta 
Signed-off-by: Peter Zijlstra (Intel) 
Reviewed-by: Juri Lelli 
Reviewed-by: Luca Abeni 
Reviewed-by: Daniel Bristot de Oliveira 
Cc: Juri Lelli 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-dl@retis.sssup.it
Link: http://lkml.kernel.org/r/1473443117-11794-2-git-send-email-tommaso.cucinotta@sssup.it
Signed-off-by: Ingo Molnar

Documenation: update cgroup's document path

2016-08-03T21:43:58+00:00

cgroup's document path is changed to "cgroup-v1". update it.

Signed-off-by: seokhoon.yoon 
Signed-off-by: Jonathan Corbet

sched/dl/Documentation: Split Section 3

2015-05-19T06:39:21+00:00

Introduce 4 subsections to make Section 3 more readable.

Signed-off-by: Luca Abeni 
Signed-off-by: Peter Zijlstra (Intel) 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: henrik@austad.us
Cc: juri.lelli@gmail.com
Cc: raistlin@linux.it
Link: http://lkml.kernel.org/r/1431954032-16473-10-git-send-email-luca.abeni@unitn.it
Signed-off-by: Ingo Molnar

sched/dl/Documentation: Clarify the relationship between tasks' deadlines and absolute scheduling deadlines

2015-05-19T06:39:21+00:00

Clarify what is the relationship between tasks' parameters and scheduling
parameters, explaining how to set the scheduling parameters so that all the
absolute deadlines of a task are respected.

Signed-off-by: Luca Abeni 
Signed-off-by: Peter Zijlstra (Intel) 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: henrik@austad.us
Cc: juri.lelli@gmail.com
Cc: raistlin@linux.it
Link: http://lkml.kernel.org/r/1431954032-16473-9-git-send-email-luca.abeni@unitn.it
Signed-off-by: Ingo Molnar

sched/dl/Documentation: Add some references

2015-05-19T06:39:21+00:00

Add a description of the Dhall's effect, some discussion about
schedulability tests for global EDF, and references to real-time
literature.

Signed-off-by: Luca Abeni 
Signed-off-by: Peter Zijlstra (Intel) 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: henrik@austad.us
Cc: juri.lelli@gmail.com
Cc: raistlin@linux.it
Link: http://lkml.kernel.org/r/1431954032-16473-8-git-send-email-luca.abeni@unitn.it
Signed-off-by: Ingo Molnar

sched/dl/Documentation: Add some notes on EDF schedulability

2015-05-19T06:39:20+00:00

Add a short discussion about sufficient and necessary schedulability tests,
and add a simple example showing that if D_i != P_i then density based tests
are only sufficient.

Also add some references to scientific papers on schedulability tests for
EDF that are both necessary and sufficient, and on their computational
complexity.

Signed-off-by: Luca Abeni 
Signed-off-by: Peter Zijlstra (Intel) 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: henrik@austad.us
Cc: juri.lelli@gmail.com
Cc: raistlin@linux.it
Link: http://lkml.kernel.org/r/1431954032-16473-7-git-send-email-luca.abeni@unitn.it
Signed-off-by: Ingo Molnar

sched/dl/Documentation: Clarify indexing notation

2015-05-19T06:39:20+00:00

The "_i" index is used in this document to to denote a particular task,
so "sum_i", "max_i" and "min_i" might be confusing.

Signed-off-by: Luca Abeni 
Signed-off-by: Peter Zijlstra (Intel) 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: henrik@austad.us
Cc: juri.lelli@gmail.com
Cc: raistlin@linux.it
Link: http://lkml.kernel.org/r/1431954032-16473-6-git-send-email-luca.abeni@unitn.it
Signed-off-by: Ingo Molnar