[Gems-users] Separate User and OS Execution

["Dave Z." <zhu_dave@xxxxxxxxx>]

Hello,

I'm trying to separate user and OS execution, in other
words I'm trying to see how my benchmarks behave
isolated from the OS (e.g. state transitions only in
user mode, etc) . So, I'm trying to isolate the
program simulation as I don't want to get metrics
related with the OS. On my previous inquiry, Dan
recommended that I modify Ruby's commands.C
(operate_memory()). I couldn't find that function, the
closest I could find is observe_memory(). I did the
following change:

void
mh_memorytracer_observe_memory(memory_transaction_t
*mem_trans)
{
  // Pass this request off to
SimicsDriver::makeRequest()
  SimicsDriver* simics_interface_ptr =
static_cast<SimicsDriver*>(g_system_ptr->getDriver());
  mem_trans->priv = 1; // THIS IS WHAT I'VE ADDED
 
simics_interface_ptr->observeMemoryAccess(mem_trans);
}

As the priv bit is set, it should return from the
function instead of calling any other Ruby
functionality, right? But I still get the same results
including user accesses and supervisor accesses. Am I
missing something?

Thank you very much.


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