> > 
> > % perf stat -a -I 1000 --metric-only
> >      1.001452803 frontend cycles idle insn per cycle       stalled cycles 
> > per insn branch-misses of all branches
> 
> where does 'frontend' collumn come from?
> can't see it in the code or get it in output..

It comes from the shadow stats. All the columns are collected from
there. Probably your CPU doesn't implement it. I try to hide 
it when it's not supported.

-Andi

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