On full system you can also try to instrument the syscall function symbol, we 
do something analogous for panic detection: 
https://github.com/gem5/gem5/blob/f28b2e773f2ee97bf9c755b33aef9befc052d281/src/arch/arm/linux/fs_workload.cc#L207
________________________________
From: ABD ALRHMAN ABO ALKHEEL via gem5-users <[email protected]>
Sent: Saturday, October 24, 2020 10:00 PM
To: gem5 users mailing list <[email protected]>; gem5-users 
<[email protected]>
Cc: ABD ALRHMAN ABO ALKHEEL <[email protected]>
Subject: [gem5-users] track the write syscall in the kernel

Hi All;

I want to track the write syscall in order to do some calculations on the 
written bytes. I just want to know what is the function that does write syscall 
function and how I can the written bytes from it.

Any help would be appreciated.

Thanks

https://github.com/torvalds/linux/blob/master/fs/read_write.c
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