Hope this helps,
https://stackoverflow.com/questions/61052733/obtaining-physical-address-trace-from-gem5.
Greetings,
Miguel Antonio Avargues Gutiérrez.
El 31/03/2021 a las 18:57, Joardar, Biresh Kumar via gem5-users escribió:
Hello,
I intend to observe all the physical DRAM addresses that are accessed
when an application is being executed in full-system mode. Following
some earlier discussions on this mailing list, I used the commMonitor.
I added the following lines to fs.py file:
test_sys.monitor = CommMonitor()
test_sys.monitor.trace = MemTraceProbe(trace_file = "monitor.ptrc.gz")
Next, I connected the CommMonitor as follows in the CacheConfig.py file:
system.l2.mem_side = system.monitor.slave
system.monitor.master = system.membus.slave
I create and then restore from a checkpoint just before the
application is started. Following is my command line:
./build/X86/gem5.opt configs/example/fs.py --kernel
/home/myComputer/Desktop/x86_64-vmlinux-2.6.28.4-smp --disk-image
/home/myComputer/Desktop/x86root-parsec.img --script
/home/myComputer/Desktop/gem5/configs/boot/test.rcS --caches --l2cache
--checkpoint-restore=1 --restore-with-cpu=TimingSimpleCPU
Next, I use the decode_packet_trace.py file in utils folder to process
the .ptrc file obtained after simulation. Following is a sample of the
output of this step:
5,u,531425792,64,256,4986860244500
6,u,535891200,64,2,4986860333000
9,u,529653760,64,512,4986868293000
9,u,530137088,64,512,4986868293000
9,u,529657856,64,512,4986868293000
9,u,530022400,64,512,4986868293000
10,u,531425216,64,256,4986868293000
8,u,529655744,64,512,4986868294500
8,u,521711552,64,512,4986868294500
...
The 3rd column in this output seems to be the address. However, DRAM
addresses are usually represented in Hexadecimal format. In the entire
output file, I did not find any alphabet character. All addresses are
just numbers. Is this expected output? Do I need to convert these
addresses to hexadecimal format manually next or did I make a mistake
in the full-sytem setup?
Thanks,
Biresh
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