We are pleased to announce the next update to our new preempt-rt series.

  - forward to 2.6.31.12

  - large number of RCU assumption fixes vs. cred and tasklist_lock

  - Priority Inheritance POSIX compliance fix

  - workaround for Priority Protection POSIX compliance problem

  - misc. fixlets here and there

It took quite a while to get this update out for various reasons:

  - mainline merge of the locking infrastructure changes which are a     further milestone on the way to full rt integration. That merge     will shave off a large portion of the rt patch (don't worry, we     have enough new and exiting stuff in the pipeline to keep the     patch size large enough)

 - fixing RCU assumptions in mainline and backport to 31-rt

 - lots of brain twisting around the POSIX scheduling policy    compliance problems which got reported vs. Priority    Inheritance/Protection

 - an extended christmas break and the resulting email backlog

 - our new housemate: http://tglx.de/~tglx/housemate.png

Further plans:

 - a last big feature for 31-rt is pending, which is worth a separate    release: Nick Piggins VFS scalability patches. I'm still running    tests on that, so no promise.

 - I'm going to switch 31-rt into maintaince mode (with or without    the VFS patches) and concentrate on getting .33-rcX-rt out. Yes,    there will be no .32-rt. The reason is simply that the locking    changes which got merged into .33 are making my life easier and    are the base to sort out more ready for the mainline stuff.

Download locations:

  http://rt.et.redhat.com/download/ (temporary out of sync)   http://www.kernel.org/pub/linux/kernel/projects/rt/

Git release branch:   git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git rt/2.6.31

Git development branch:   git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git rt/head

Gitweb:  
http://git.kernel.org/?p=linux/kernel/git/tip/linux-2.6-tip.git;a=shortlog;h=rt/2.6.31

Information on the RT patch can be found at:

  http://rt.wiki.kernel.org/index.php/Main_Page

to build the 2.6.31.12-rt20 tree, the following patches should be applied:

  http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.31.12.tar.bz2   http://www.kernel.org/pub/linux/kernel/projects/rt/patch-2.6.31.12-rt20.bz2

Enjoy !

     tglx