RE: [patch] Real-Time Preemption, -RT-2.6.12-rc1-V0.7.41-25

RE: [patch] Real-Time Preemption, -RT-2.6.12-rc1-V0.7.41-25

[kus Kusche Klaus]

> i have released the -V0.7.41-25 Real-Time Preemption patch, 
> which can be 
> downloaded from the usual place:

1. Does not compile without RT_DEADLOCK_DETECT:
kernel/rt.c: In function `change_owner':
kernel/rt.c:556: error: structure has no member named `debug'
kernel/rt.c: In function `pi_setprio':
kernel/rt.c:576: error: structure has no member named `debug'
kernel/rt.c: In function `task_blocks_on_lock':
kernel/rt.c:677: error: structure has no member named `debug'
kernel/rt.c:687: error: structure has no member named `debug'
kernel/rt.c: In function `__up_mutex':
kernel/rt.c:1223: error: structure has no member named `debug'

2. My problem (see my LKML mails yesterday) is not yet solved:
The latency tracer shows latencies of at most 40 microseconds,
but my test program at rtprio 99 sometimes did not get any CPU 
for milliseconds...

-- 
Klaus Kusche
Entwicklung Software - Steuerung
Software Development - Control

KEBA AG
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Tel +43 / 732 / 7090-3120
Fax +43 / 732 / 7090-8919
E-Mail: kus@keba.com
www.keba.com

Re: [patch] Real-Time Preemption, -RT-2.6.12-rc1-V0.7.41-25

[Ingo Molnar]

* kus Kusche Klaus <kus@keba.com> wrote:

> > i have released the -V0.7.41-25 Real-Time Preemption patch, 
> > which can be 
> > downloaded from the usual place:
> 
> 1. Does not compile without RT_DEADLOCK_DETECT:
> kernel/rt.c: In function `change_owner':
> kernel/rt.c:556: error: structure has no member named `debug'

ok - i fixed this in -42-01.

> 2. My problem (see my LKML mails yesterday) is not yet solved: The 
> latency tracer shows latencies of at most 40 microseconds, but my test 
> program at rtprio 99 sometimes did not get any CPU for milliseconds...

(please Cc: me on PREEMPT_RT related mails - i might not notice lkml 
mails.) I'll reply to your lkml mail in a separate thread.

	Ingo

[patch] Real-Time Preemption, -RT-2.6.12-rc1-V0.7.41-25

[Ingo Molnar]

i have released the -V0.7.41-25 Real-Time Preemption patch, which can be 
downloaded from the usual place:

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

this release tries to stabilize things some more. In particular i've 
changed 'nocheck' semaphores to not be included in any PI or debugging 
logic. This makes them pretty much stateless and compatible. XFS seems 
to be working much better with this approach, and maybe some of the 
other problematic subsystems (USB/firewire) will improve too.

there's also a latency tracer fix which should cure some of the 
'truncated traces' problems.

i've also included Trond Myklebust's NFS client patch which should 
reduce latencies in that area (on PREEMPT_DESKTOP/VOLUNTARY kernels - 
under PREEMPT_RT the whole NFS code was fully preemptable already).  
It's experimental so be careful if you are using NFS.

to create a -V0.7.41-25 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-V0.7.41-25

	Ingo