device: 0.686
PID: 0.635
architecture: 0.607
mistranslation: 0.452
arm: 0.362
virtual: 0.354
performance: 0.345
graphic: 0.269
semantic: 0.234
network: 0.227
ppc: 0.175
user-level: 0.158
VMM: 0.116
socket: 0.115
risc-v: 0.095
hypervisor: 0.094
debug: 0.084
vnc: 0.080
peripherals: 0.074
i386: 0.069
boot: 0.069
register: 0.059
TCG: 0.055
x86: 0.036
permissions: 0.036
kernel: 0.023
files: 0.010
assembly: 0.007
KVM: 0.002

qemu seems to lack support for pid namespace.