On Thu, 2009-07-30 at 16:10 -0500, Jason Wessel wrote: > Maxim Levitsky wrote: > > On Thu, 2009-07-30 at 03:31 -0500, Jason Wessel wrote: > >> > >> 3) Develop a low level dedicated ethernet debug interface. If you have > >> more than one ethernet, or an ethernet device that has multiple hardware > >> queues, it is plausible to have a dedicated way to talk to a device > >> which has no restrictions on getting preempted, or used by another part > >> of the kernel. This lends itself to an ideal medium for kgdb > >> communications. > > > Or, even better, to make in possible to switch between a normal, and > > exclusive mode? Maybe this cab be done without (or with slight) > > modifications to network drivers. Why not to make kgdb own the > > network device (use it exclusively), but use same interfaces as > > regular kernel does? > > The key problem is how such a switch is governed between normal and > exclusive mode works. If it involves locks kgdboe is not going to > work reliably from the exception context. I mean the switch should happen just once, when kgdboe is loaded, and back when unloaded.
> > Having kgdboe directly own an interface and use the same kernel API as > the network stack won't work out of the box because there is probing, > interrupt control and lots of other tidbits. This is a case where the > polling API needs some work or a dedicated API is needed, because this > is a case where you really don't want the whole network stack > involved. IE it would be nice to be able to debug the networking > stack with kgdboe. Sure, but I feel that doing any significant changes to _all_ ethernet drivers is a huge job. > > Patches which implement new functionality, ideas and discussion about > any aspect of kernel debugging are always welcome on the kgdb mailing > list. :-) Best regards, Maxim Levitsky > > Cheers, > Jason. > ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Kgdb-bugreport mailing list Kgdb-bugreport@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kgdb-bugreport