linux - perf samples on esxi virtualized debian squeeze -


perf report not show output when running on esxi virtualized debian squeeze

root@my:~# uname -a  linux 2.6.32-5-amd64 #1 smp fri may 10 08:43:19 utc 2013 x86_64 gnu/linux  root@my:~# dpkg --get-selections | grep linux-tools  linux-tools-2.6.32  root@my:~# perf stat true performance counter stats 'true':     0.723921  task-clock-msecs         #      0.261 cpus           1  context-switches         #      0.001 m/sec           0  cpu-migrations           #      0.000 m/sec          99  page-faults              #      0.137 m/sec  6442450941  cycles                   # 8899383.967 m/sec  6442450941  instructions             #      1.000 ipc           0  cache-references         #      0.000 m/sec           0  cache-misses             #      0.000 m/sec  0.002775829  seconds time elapsed  root@my:~# perf record -a -g -f sleep 20  [ perf record: woken 1 times write data ]  [ perf record: captured , wrote 0.042 mb perf.data (~1826 samples) ] root@my:~# perf report  # samples: 0 # # overhead        command  shared object  symbol # ........  .............  .............  ...... # # # (for higher level overview, try: perf report --sort comm,dso) #

why there no samples in recording?


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