Re: [Gems-users] UserMode vs. SupervisorMode cache requests

[Philip Garcia <pcgarcia@xxxxxxxx>]

I'm pretty sure there's a bug in Opal regarding the change in context, and in the default install, it doesn't change what context is running.  If this is the case, it's possible that the code that handles the user/supervisor mode checks might be checking the context and testing for zero, and always returning the wrong value.

Phil
On Feb 17, 2010, at 10:31 PM, Byn Choi wrote:

> Carole,
> 
> With stock install (no manual changes to ruby/opal), you should see usermode accesses, as long as the setup is correct, i.e. there actually is a usermode app running inside the simulation environment. You may want to double check that first.
> 
> If you are sure that there is an app running inside your simulation environment, then the next place to poke around is the simics-ruby interface, specifically the ruby_operate function in ruby/module/ruby.c. This gets called every time simics wants to do a memory access, and it passes an object of type generic_transaction_t to ruby. Follow from there how the request passed down through ruby/simics/Commands.C, ruby/simics/SimicsDriver.C and eventually ruby/simics/SimicsProcessor.C. There, it gets converted to CacheMsg type.
> 
> I would first do a sanity check by putting a small code along that call chain to see if I am actually getting any usermode accesses through that ruby interface - small code to keep a count of such accesses, run for a while, check to see if it's non-zero. If it isn't, then at least you know your checkpoint isn't the problem, and you can go from there.
> 
> Byn
> 
> On Feb 17, 2010, at 10:10 PM, Carole-Jean Wu wrote:
> 
>> Hello list,
>> 
>> I would like to separate user mode requests from supervisor mode requests in Simics-3.0.x/GEMS-2.1.X. I know that there is a field in all cache messages, called AccessModeType, which is set to either UserMode of SupervisorMode. However, in my ruby statistic files, I do not see any UserMode requests at all. Did any of you experience similar situation? Or, can someone point me where to look at?
>> 
>> Thanks in advance,
>> Carole
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