On 1/9/15 7:55 AM, Jiri Olsa wrote:
hi, I couldn't use following perf command to insert return probe:# perf probe -a fork_exit=do_fork%return Added new event: Failed to write event: Invalid argument Error: Failed to add events. I'm pretty sure I used this command before, so seems like it's broken. I can still use debugfs tracing interface to do that: # echo 'r:do_fork_entry do_fork' > kprobe_events I used Arnaldo's latest perf/core and FC20 kernel: # uname -a Linux krava 3.17.7-200.fc20.x86_64 #1 SMP Wed Dec 17 03:35:33 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux # ./perf version perf version 3.18.g6a7d78
If you want to bisect it the perf-probe command works for me on FC20, 3.17.7-200.fc20.x86_64 with perf from 3.12 (my local modified version is based on 3.12).
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