---
user/glossary/index.rst | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/user/glossary/index.rst b/user/glossary/index.rst
index 5648b39..082483d 100644
--- a/user/glossary/index.rst
+++ b/user/glossary/index.rst
@@ -16,6 +16,22 @@ Glossary
APA
Arbitrary Processor Affinity
+
+ Weak APA: Invariant for this model states that for any backlogged
task(task not
+ yet assigned a processor), all the processors in its affinity mask are
+ occupied by higher-priority tasks. That is, there is no candidate
+ task for preemption scheduled on any of the processors(in a backlogged
+ task's affinity mask) on which the backlogged task may execute. Linux's
+ push-pull scheduling is an example of weak-APA scheduling.
+
+ Strong APA: In this model, on the arrival of a task, every task reachable
+ from the newly arrived task is checked to see if an existing task can
+ be shifted(or deallocated its processor) and newly arrived task can take
+ its place if the newly arrived task has a higher priority. Similar
analysis is
+ done when a task finishes its execution.
+
+ Learn more at: https://people.mpi-sws.org/~bbb/papers/talks/rtss14f.pdf
+
API
Application Programming Interface
@@ -145,4 +161,4 @@ Glossary
Waf build system. For more information see http://www.waf.io/
YAFFS2
- `Yet Another Flash File System version 2
<https://git.rtems.org/sebh/rtems-yaffs2.git>`_
+ `Yet Another Flash File System version 2
<https://git.rtems.org/sebh/rtems-yaffs2.git>
--
2.17.1
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