dtrace discuss - Mar 2010 - tracing stops after a while, even with bufpolicy=ring

Hi,

I need to do some anoymous tracing on a customer''s system, as I need to
catch events just before a panic.

Even though the script has the following line :


#pragma D option bufpolicy=ring

Tracing stops after a few hours, and the event is missed.

system is an x86 with KU 138889-07

Any idea why dtrace stops tracing, as if the ring policy was not applied  ?

Cheers,

Philippe Magerus

Hey Philippe,

Why are you using anonymous tracing? I suppose DTrace might be aborting and it
might not have a way of alerting you. If you run dtrace(1M) with bufpolicy=ring
you can still recover the data from a crash dump.

Adam

On Mar 30, 2010, at 2:28 AM, philippe magerus wrote:
> Hi,
> 
> I need to do some anoymous tracing on a customer''s system, as I
need to catch events just before a panic.
> 
> Even though the script has the following line :
> 
> 
> #pragma D option bufpolicy=ring
> 
> Tracing stops after a few hours, and the event is missed.
> 
> system is an x86 with KU 138889-07
> 
> Any idea why dtrace stops tracing, as if the ring policy was not applied  ?
> 
> Cheers,
> 
> Philippe Magerus
> _______________________________________________
> dtrace-discuss mailing list
> dtrace-discuss at opensolaris.org

--
Adam Leventhal, Fishworks                        http://blogs.sun.com/ahl