> > A new --smi-cost mode in perf stat is implemented to measure the SMI cost > > by calculating cycles and aperf results. In practice, the percentages of > > SMI cycles should be more useful than absolute value. > > That's only true for performance oriented analysis, but for analyzing the > root cause of latencies the actual cycles are definitely interesting.
perf stat also prints the absolute cycles of course (unless you do --metric-only) It cannot print individual cycles (per SMI occurrence), the only way to do that would be to poll constantly. -Andi
