Good catch, Torsten. I stumbled across this issue a few weeks ago myself but didn't figure out a solution yet. See https://github.com/genodelabs/genode/issues/1508
On Wed, 27 May 2015 10:53:59 +0200 Torsten Frenzel <fren...@os.inf.tu-dresden.de> wrote: > Hello, > > currently, I explore Genode's tracing-feature and have a few questions > regarding policy modules and trace buffers: > > I'm working with the 15.02 release and found two examples of policy modules, > called null and rpc_name. Are there other examples in branches of the repo on > how to implement a custom policy module. In general what are the > restrictions, when implementing a policy module? > > Is it possible to extract more specific information for a certain event, for > example, the name of the destination, that was called. Furthermore, the > policy modules for Rpc_call and Rpc_returned events have access to a data > structure of type Msgbuf_base. As far as I understood the message buffer > contains the arch-depended marshalled data. Is there a generic mechanism to > interpret these data in a meaningful way inside policy module or the trace > monitor? > > It would be helpful to accurately timestamp every recorded event with a value > of a real time clock. But that would require access to service that provides > such an information. Again, I cannot see how to get access to such a service > from inside the policy module, because it hasn't access to the Genode runtime > environment. Maybe the correct approach would be to use a fast timestamp > function inside the policy module and later calculate the real time value in > the trace monitor? > > Is it possible to disable/enable specific types of events (, may be using the > Trace::Control data structure)? > > Is there a mechanism that the trace monitor is notified, when a trace-buffer > is full or has reached a threshold? > > > When I played around with the test_trace program, I noticed that loading more > than policy module into core fails. After some investigations I found that > the slab_size for the constructed allocator used in the Policy_registry class > for Trace::Policy objects is only 4 bytes, but Trace::Policy objects have a > larger size of 26 bytes. When I changed the constructor in the session > component as shown below everything works fine. So for some reason the > compiler selects the Avl_node_base::Policy class in the template. > > diff -r ./base/src/core/include/trace/session_component.h . > 40,41c40,41 > < Tslab<Trace::Policy, 4096> _policies_slab; > --- > > Tslab<Policy, 4096> _policies_slab; > > > Regards, > Torsten > > > ------------------------------------------------------------------------------ > _______________________________________________ > genode-main mailing list > genode-main@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/genode-main -- Johannes Schlatow, M.Sc. IDA, Institute of Computer and Network Engineering Technische Universität Braunschweig Hans-Sommer-Str. 66 38106 Braunschweig - Germany Phone +49 531 391 - 9668 www.ida.ing.tu-bs.de schla...@ida.ing.tu-bs.de ------------------------------------------------------------------------------ _______________________________________________ genode-main mailing list genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
