On Sat, Oct 22, 2016 at 10:28:06AM +0200, Ingo Molnar wrote: SNIP
> > tools/perf/ui/browsers/hists.h | 1 + > > tools/perf/util/hist.c | 1 + > > tools/perf/util/hist.h | 1 + > > tools/perf/util/mem-events.c | 128 ++ > > tools/perf/util/mem-events.h | 37 + > > tools/perf/util/sort.c | 2 +- > > tools/perf/util/sort.h | 1 + > > 13 files changed, 3210 insertions(+), 2 deletions(-) > > create mode 100644 tools/perf/Documentation/perf-c2c.txt > > create mode 100644 tools/perf/builtin-c2c.c > > Pulled the perf-c2c-for-mingo-20161021 tag, thanks a lot Arnaldo! > > I can see some teething problems. For example if I run it on an older kernel > (v4.4 > distro kernel), I get this: > > triton:~/tip> perf c2c record perf bench sched pipe > # Running 'sched/pipe' benchmark: > # Executed 1000000 pipe operations between two processes > > Total time: 12.001 [sec] > > 12.001919 usecs/op > 83320 ops/sec > [ perf record: Woken up 18 times to write data ] > [ perf record: Captured and wrote 5.356 MB perf.data (69804 samples) ] > > but there's no 'perf c2c report' TUI output at all: > > Shared Data Cache Line Table (0 entries, sorted on remote HITMs) > > > Total Rmt ----- LLC Load Hitm ----- ---- > Store Reference ---- --- Load Dram ---- LLC Total ----- Core Load > Hit ----- -- LLC Load Hit - > Index Cacheline records Hitm Total Lcl Rmt > Total L1Hit L1Miss Lcl Rmt Ld Miss Loads FB > L1 L2 Llc Rm > > > > and just an empty screen. > > If I do 'perf report' I get two events: > > Available samples > 24K cpu/mem-loads,ldlat=30/P > 45K cpu/mem-stores/P > > and both have some real data. > > What am I missing? hm, most likely you did not generate any remote HITMs.. if it was on the laptop? you might get some results for local HITMs with -d option: $ perf c2c report -d lcl the default display/filter is for Remote HITMs.. perhaps we could be smart enough and switch to local when we found no data for remote jirka
