Messages in this thread | | | Date | Wed, 17 Nov 2004 13:42:34 +0100 | From | Ingo Molnar <> | Subject | [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.28-0 |
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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
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