i have released the 2.6.15-rt17 tree, which can be downloaded from the
usual place:
http://redhat.com/~mingo/realtime-preempt/
lots of changes all across the map. There are several bigger changes:
the biggest change is the new PI code from Esben Nielsen, Thomas
Gleixner and Steven Rostedt. This big rework simplifies and streamlines
the PI code, and fixes a couple of bugs and races:
- only the top priority waiter on a lock is enqueued into the pi_list
of the task which holds the lock. No more pi list walking in the
boost case.
- simpler locking rules
- fast Atomic acquire for the non contended case and atomic release
for non waiter case is fully functional now
- use task_t references instead of thread_info pointers
- BKL handling for semaphore style locks changed so that BKL is
dropped before the scheduler is entered and reaquired in the return
path. This solves a possible deadlock situation in the BKL reacquire
path of the scheduler.
another change is the reworking of the SLAB code: it now closely matches
the upstream SLAB code, and it should now work on NUMA systems too
(untested though).
the tasklet code was reworked too to be PREEMPT_RT friendly: the new PI
code unearthed a fundamental livelock scenario with PREEMPT_RT, and the
fix was to rework the tasklet code to get rid of the 'retrigger
softirqs' approach.
other changes: various hrtimers fixes, latency tracer enhancements - and
more. (Robust-futexes are not expected to work in this release.)
please report any new breakages, and re-report any old breakages as
well.
to build a 2.6.15-rt17 tree, the following patches should be applied:
http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.15.tar.bz2
http://redhat.com/~mingo/realtime-preempt/patch-2.6.15-rt17
Ingo
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