On Tue, 2006-02-21 at 16:55 +0100, Ingo Molnar wrote:
> 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
http://people.redhat.com/mingo/realtime-preempt/patch-2.6.16-rt17 ???
-tim
>
> Ingo
> -
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