Re: 2.6.13-rt1

[Steven Rostedt <rostedt@goodmis.org>]

On Tue, 2005-08-30 at 15:34 -0700, Daniel Walker wrote:
> Have you tried turning on 
> "Non-preemptible critical section latency timing" or "Latency tracing"

I just turned on the following:

  CONFIG_CRITICAL_PREEMPT_TIMING
  CONFIG_CRITICAL_IRQSOFF_TIMING
  CONFIG_LATENCY_TRACE

recompiled and booted.  No problem here.

> 
> I don't know if it's related to the PI changes, but I'm getting a crash
> with those on em64t .
> 
> With both above options I get
> 
> <0>init[1]: segfault at ffffffff8010ef44 rip ffffffff8010ef44 rsp 00007fffferror 5
> <0>init[1]: segfault at ffffffff8010ef44 rip ffffffff8010ef44 rsp 00007ffffffe8de8 error 5
> 
> printed never ending right after init starts.
> 
> If I only turn on "Non-preemptible critical section latency timing",
> then when I enter the command,
> "echo 0 > /proc/sys/kernel/preempt_max_latency"
> 
> The kernel will spit out a couple of max critical section updates , then
> it will hang silently.
> 
> This is all new in 2.6.13-rtX . It could have just come in with 2.6.13 ,
> but I thought I'd mention it.

Did you try the latest patches I just sent. Mainly this last one on
-rt2?  There is a deadlock that is fixed wrt the BKL.

-- Steve