Appended data not reportable

[David Flater <dflater@nist.gov>]

With kernel/perf 3.7.1, trying to do something akin to the "sum" option of
gprof to pool the samples from multiple runs.

This option from the perf-record man page looked promising:
-A, --append
    Append to the output file to do incremental profiling.

bash-4.2$ perf record -F 1000 ./app
bash-4.2$ perf record -F 1000 -A ./app

perf.data gets bigger, but then neither perf report nor perf script work.  Both
say:
0x1a0 [0]: failed to process type: 0

Is this a regression?

Thanks,
-- 
David Flater, National Institute of Standards and Technology, U.S.A.