Hi,
A few questions regarding M5 and the best way to get configuration
settings and access information.
Background: Porting Wattch to a new simulator just involves, passing
architecture parameters (like number of processors, l2 cache size,
number of dtlb entries, etc ...) calling init_power() routine ( allocate
various structures which hold current power information),
calculate_core_power() (static estimate of power consumptions), adding
calls which update structures within Wattch when a certain power related
structure is accessed, calling update_power_stats() at the end of each
cycle (which looks at all the power related accesses on the architecture
in the current cycle) and finally displaying the end power results. One
obvious location to put these routines is in src/sim/simulate.cc in
function simulate, but there are problems and maybe I could get some
suggestions on a better place to add these routines or how to use M5
more effectively.
1) Is there any structure or class accessible which contains all the
parameter information for the current architecture in C++ code within
the simulate() function? I need things like the number of cores on the
processor, l2 cache size, dtlb entries, in order to initialize Wattch
to the correct values. I understand that python is specifying these
parameter values, and they are being translated to C++ objects, I am
just wondering how can get a hold of these object values from within
src/sim/simulate.cc::simulate() so I can pass them to Wattch.
2) It will be necessary to update structures within Wattch that keep
track of things like alu_accesses[cpu_id]. Am I right in assuming that
the Struct Param.cpu_id in BaseCpu has a unique id for each core in a
system which I can use to keep track of the different core's statistics?
Thanks,
-Richard
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