[patch] Real-Time Preemption, -VP-2.6.9-rc4-mm1-U2

From: Ingo Molnar
Date: Thu Oct 14 2004 - 18:57:10 EST



i have released the -U2 PREEMPT_REALTIME patch:

http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.9-rc4-mm1-U2

this too is a bugfixes-only release, and it is still experimental code.

Changes since -U1:

- bugfix: fix page_lock_anon_vma() crash reported by Adam Heath and
Lorenzo Allegrucci.

- bugfix: fix selinux atomic-schedule warning messages, reported by
Mark H Johnson.

- bugfix: ip_tables atomic-schedule fix, fixes the messages reported by
Daniel Walker and K.R. Foley.

- bugfix: fix warnings/deadlocks in inet_create(), reported by Mark H
Johnson.

- bugfix: fixed a crash-in-shmfs-during-heavy-swapout bug

- bugfix: enable preemption while doing mmdrop() in the scheduler - it
may schedule.

- debugging feature: when PREEMPT_TIMING is enabled then the code also
keeps a trace/stack of preemption enabler EIPs. (if LATENCY_TRACE is
enabled as well then the parent EIP is recorded as well.) Whenever a
stack trace due to atomicity violations is printed, the preemption
stack is printed as well. This makes it much easier to identify the
place that did the illegal preemption-disabling.

to create a -U2 tree from scratch the patching order is:

http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.8.tar.bz2
+ http://kernel.org/pub/linux/kernel/v2.6/testing/patch-2.6.9-rc4.bz2
+ http://kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.9-rc4/2.6.9-rc4-mm1/2.6.9-rc4-mm1.bz2
+ http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.9-rc4-mm1-U2

Ingo
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