#! /usr/bin/env stapprobe perf.sw.cpu_clock!, timer.profile { // NB: To avoid contention on SMP machines, no global scalars/arrays used, // only contention-free statistics aggregates. tid=tid(); e=execname() if (!user_mode()) kticks[e,tid] <<< 1 else uticks[e,tid] <<< 1 ticks <<< 1 tids[e,tid] <<< 1}global uticks%, kticks%, ticksglobal tids%probe timer.s(5), end { allticks = @count(ticks) printf ("%16s %5s %7s %7s (of %d ticks)\n", "comm", "tid", "%user", "%kernel", allticks) foreach ([e,tid] in tids- limit 20) { // SystemTap only performs integer arithmetic. // To avoid losing precision the decimal point is shifted // to the right four places (*100000). Think of this as // the original result value x.xxyy becoming xxxyy.0. // The integer percentage xxx is obtained // by dividing by 100 and the fractional percentage // is obtained with a modulo 100 operation. uscaled = @count(uticks[e,tid])*10000/allticks kscaled = @count(kticks[e,tid])*10000/allticks printf ("%16s %5d %3d.%02d%% %3d.%02d%%\n", e, tid, uscaled/100, uscaled%100, kscaled/100, kscaled%100) } printf("\n") delete uticks delete kticks delete ticks delete tids}