Hi guys, I was playing with gem5 (full system simulation) and found one interesting feature. If you make some changes to the disk image (using mount command on the host) and restore your simulation using previously saved checkpoint you may not find your changes in the simulated filesystem. The main reason for this is the fact that OS has its own cache for the filesystem which is stored in the main memory. You need to manually drop this cache to force simulated OS to read data from the disk image.
This can be done the following way: # sync # echo 3 > /proc/sys/vm/drop_caches Here is example: $ ./build/ARM/gem5.opt configs/example/fs.py --disk-image=arm-ubuntu-natty-headless.img -r 1 $ telnet 127.0.0.1 3456 # cd / # ls bin dev home lost+found mnt proc sbin srv tmp var boot etc lib media opt root selinux sys usr # sync # echo 3 > /proc/sys/vm/drop_caches # ls benchmarks boot etc lib media opt root selinux sys tmp var bin dev home lost+found mnt proc sbin srv usr You may see that the benchmarks folder appeared. I took me some time to understand what's happening. I didn't find this solution somewhere on the website and want to share it with the community. Have a nice day Oleg _______________________________________________ gem5-users mailing list gem5-users@gem5.org http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
