Control: tag -1 unreproducible On Sun, 2012-12-30 at 08:56 +1100, Michael van der Kolff wrote: > Package: linux-tools-3.2 > Version: 3.2.17-1 > Severity: normal > > Dear Maintainer, > When issuing "perf record -p <annoying_process_id> -g", I got "Fatal: failed to > mmap with 22 (Invalid argument)". This is remedied by setting > /proc/sys/kernel/perf_event_paranoid to -1 (I tested it with 0, and it still > occurred). > > perf record should state what sys.kernel.perf_event_paranoid should be set to > in response to failure, instead of giving me such a useless error message. I can't reproduce this: $ perf record -p 20140 -g # 20140 is my own process ^C[ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.015 MB perf.data (~634 samples) ] $ perf record -p 1 -g Error: Permission error - are you root? Consider tweaking /proc/sys/kernel/perf_event_paranoid: Is the target process running under the same uid as perf? Can you provide an strace log for this? Ben. -- Ben Hutchings It is easier to change the specification to fit the program than vice versa.
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