3.0 Changelog

Revision as of 03:21, 21 March 2012 by Aclindsa (Talk | contribs)

Changes made between Beta 2.8 and 3.0.

Kernel

Moved from kernel version 2.6.33.9 to 3.0.24, and updated to the 3.0.24-rt42 version of the PREEMPT_RT patch.
Fixed several bugs resulting from changes made between the 2.6.33.9 and 3.0.24 kernels.
Allow processes to exit gracefully, even if inside a real-time segment.
Ported to ARM architecture.
- Made MCS Lock implementation more generic. This will allow for easier porting of ChronOS to additional platforms. While the current 'generic' implementation is optimized for x86_64, it has been done in a way that encourages optimized architecture-specific versions.
Added DEBUG_CHRONOS config option which adds several checks in the kernel which are useful for debugging (including warning when a ChronOS task blocks inside its RT segment, and when it exits prematurely).
Converted all scheduler-managed lists to Linux's 'struct list_head' style lists, and added '#define' constants for referencing them by name.
United the initialization of the /proc/chronos/ entries, so that directory is guaranteed to always be created, and made /proc/chronos/schedulers always available, even if scheduling statistics are not enabled.

Re-wrote entire sched_test_app for better modularity, portability, and expandability.
- Remove dependence on QT
- Add three timing methods: WCET, average-case, and timer-polling.
- Add array-walk and linked list traversal workloads for memory-intensive testing.
- Improve accuracy of slope-generation mechanism.
Ported to ARM (fixed several overflow and type issues)