performance: 0.745
debug: 0.733
device: 0.698
ppc: 0.658
VMM: 0.503
TCG: 0.461
assembly: 0.459
KVM: 0.365
i386: 0.343
arm: 0.338
x86: 0.316
vnc: 0.315
semantic: 0.309
kernel: 0.257
peripherals: 0.215
architecture: 0.202
boot: 0.200
hypervisor: 0.200
risc-v: 0.172
graphic: 0.167
virtual: 0.137
register: 0.129
PID: 0.128
network: 0.113
mistranslation: 0.059
user-level: 0.050
permissions: 0.048
socket: 0.032
files: 0.007

source code of function trace_memory_region_ops_write()