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Subject[patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.28-0

i have released the -V0.7.28-0 Real-Time Preemption patch, which can be
downloaded from the usual place:

http://redhat.com/~mingo/realtime-preempt/

this is a fixes & latency-reduction release.

Changes since a -V0.7.27-3:

- made the UP-ioapic code a bit more conservative again - maybe some of
the lockups are related?

- removed the BKL from the sound code in a cleaner way and
removed the quite fragile 'negative ->lock_depth' code. Much less
intrusive than i originally thought, and much cleaner as well.

- more fixes to the wakeup-timing logic, 4 false positives fixed in
total, mostly related to new-task-wakeup not accurately starting the
tracer.

- fixed the mmx-memcpy related latency reported by Florian Schmidt and
others. Also turned off the MMX/SSE ops in the RAID code, which
can introduce similar latencies.

- kgdb fix from Bill Huey

- knfsd shutdown with-BKL-held fix

- highmem compilation fix

- profiling related crash fix

- implemented 'direct-path' rescheduling to further reduce scheduling
latency: the kernel will now in most cases go from try_to_wakeup()
into the scheduler directly without re-enabling interrupts ever again
(and thus not giving irq handlers a window to increase latency). This
is also the final fix for irq nesting and irq-stack recursion.

- turn off sync wakeups on PREEMPT_RT -> they are latency generators

to create a -V0.7.28-0 tree from scratch, the patching order is:

http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.9.tar.bz2
http://kernel.org/pub/linux/kernel/v2.6/testing/patch-2.6.10-rc2.bz2
http://kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.10-rc2/2.6.10-rc2-mm1/2.6.10-rc2-mm1.bz2
http://redhat.com/~mingo/realtime-preempt/realtime-preempt-2.6.10-rc2-mm1-V0.7.28-0

Ingo
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