الفهرس 
Motivation
Mapping of Real Time and Mixed Criticality Systems to MulticoreOnly 14 pages are availabe for public view
Abstract
In this thesis, we presented a new kernel based solution for overload in
mixed criticality multicore systems. The solution is based on virtual timer,
which is used to control release times and priority points of level-C jobs under
the overload state. This virtual timer does not affect high level tasks.
Moreover, it has no effect on execution time. The virtual timer is used
immediately after detecting an overload state to slow down the releases of
coming level-C tasks for limited time until the system recover from overload.
The system returns back to normal time after having all tasks’ response times
back to normal. We focused on the fast response to overload state. This is
achieved by implementing the overload handling inside the kernel space Despite that KSO inherits the main idea of using virtual timer to
recover from overload from GEL-v, KSO has a completely different
architecture and implementation. Unlike GEL-v, our proposed technique KSO
avoids using any user space invocation as it implements the overload handling
completely inside the kernel space. KSO eliminated many steps in
implementation and removed causes of delays found in GEL-v.
We applied many experiments to test the response time for overload in
KSO. We compared between KSO response time to overload and GEL-v
response time to overload. Our experimental results proved that KSO is faster
in its response to overload. Also we showed that depending on user space has
a bad effect on response to overload in addition to its overhead added to system
tasks.