On Sun, Feb 21, 2016 at 05:39:40PM +0100, Jiri Olsa wrote: > On Thu, Feb 18, 2016 at 06:39:21PM +0100, Andi Kleen wrote: > > > Where before it wasn't there: > > > > > > cat /tmp/before > > > 0.282628,,task-clock,282628,100.00 > > > 1,,context-switches,282628,100.00 > > > 0,,cpu-migrations,282628,100.00 > > > 52,,page-faults,282628,100.00 > > > 861213,,cycles,285354,100.00 > > > <not supported>,,stalled-cycles-frontend,0,100.00 > > > <not supported>,,stalled-cycles-backend,0,100.00 > > > 686082,,instructions,285354,100.00 > > > 137846,,branches,285354,100.00 > > > 7142,,branch-misses,285354,100.00 > > > > This is intentional. See the standard perf output: > > > > > > 521,232 instructions # 0.63 insns per cycle > > > > # 1.13 stalled cycles > > per insn > > > > So this line has multiple metrics. In CSV this is expressed as a mostly > > empty line. > > it's intentional if you have data from stalled cycles counter > on cpu where this one is non supported you get blank line:
I fixed this now by probing for the stalled cycles counters in advance. That avoids a couple of other issues too, like the empty columns in --metric-only, and even makes the output of standard perf stat shorter. -Andi
