Messages in this thread | | | Date | Fri, 7 Aug 2009 13:19:49 +0200 | From | Ingo Molnar <> | Subject | Re: [patch] x86, perf_counter, bts: add bts to perf_counter |
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note, i had this running in the background, as root:
/home/mingo/bin/perf top >/dev/null 2>/dev/null&
that is what interacted most likely. I killed that task and did a user-space only recording via:
titan:~> perf record -f -e branches:u -c 1 ./loop_1b_instructions
and that succeeded:
^C[ perf record: Captured and wrote 827.901 MB perf.data (~36171547 samples) ]
to make BTS sampling really practical we need a 'flight data recorder' mode for the mmap buffer (overwrite mode), right? Peter sent you a patch for that some time ago - did anything good happen to that patch?
Ingo
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