Messages in this thread | | | Date | Sat, 19 Mar 2005 20:16:58 +0100 | From | Ingo Molnar <> | Subject | [patch] Real-Time Preemption, -RT-2.6.12-rc1-V0.7.41-00 |
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i have released the -V0.7.41-00 Real-Time Preemption patch (merged to 2.6.12-rc1), which can be downloaded from the usual place:
http://redhat.com/~mingo/realtime-preempt/
the biggest change in this patch is the merge of Paul E. McKenney's preemptable RCU code. The new RCU code is active on PREEMPT_RT. While it is still quite experimental at this stage, it allowed the removal of locking cruft (mainly in the networking code), so it could solve some of the longstanding netfilter/networking deadlocks/crashes reported by a number of people. Be careful nevertheless.
there are a couple of minor changes relative to Paul's latest preemptable-RCU code drop:
- made the two variants two #ifdef blocks - this is sufficient for now and we'll see what the best way is in the longer run.
- moved rcu_check_callbacks() from the timer IRQ to ksoftirqd. (the timer IRQ still runs in hardirq context on PREEMPT_RT.)
- changed the irq-flags method to a preempt_disable()-based method, and moved the lock taking outside of the critical sections. (due to locks potentially sleeping on PREEMPT_RT).
to create a -V0.7.41-00 tree from scratch, the patching order is:
http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.11.tar.bz2 http://kernel.org/pub/linux/kernel/v2.6/testing/patch-2.6.12-rc1.bz2 http://redhat.com/~mingo/realtime-preempt/realtime-preempt-2.6.12-rc1-V0.7.41-00
Ingo
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