Dear perf maintainers,

After upgrading my system to linux 4.15 (from 4.14), `perf report` became unusably slow. I estimate a decrease in performance by a factor of 100x-1000x. Some 21M perf.data files take about 30 seconds in the "Processing events" step. `git bisect` points to

commit d8a88dd243a170a226aba33e7c53704db2f82aa6 (HEAD, refs/bisect/bad)
Author: Milian Wolff <[email protected]>
    perf util: Enable handling of inlined frames by default

The slowdown can be worked around with `--no-inline`. If the slowdown is expected, I would suggest reverting the default setting here or maybe printing a warning if a lot of time is spent on this feature.

Do you need any additional information about my system or the recorded data I am looking at?

Thanks,
Janno

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