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Message-ID: <20180320133851.GB3784@kernel.org>
Date: Tue, 20 Mar 2018 10:38:51 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Jan-Oliver Kaiser <janno@...-sws.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
milian.wolff@...b.com
Subject: Re: `perf report` about 1000x(!) slower in linux 4.15
Em Tue, Mar 20, 2018 at 12:57:29PM +0100, Jan-Oliver Kaiser escreveu:
> 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 <milian.wolff@...b.com>
> 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?
Can you try with the latest perf tool?
[acme@...et perf]$ make perf-tarxz-src-pkg ; ls -la perf-4*
TAR
PERF_VERSION = 4.16.rc6.gecd380
-rw-rw-r--. 1 acme acme 1323568 Mar 20 10:30 perf-4.16.0-rc6.tar.xz
[acme@...et perf]$
With a recently checked out kernel sources, or, as a convenience, I'm
pushing this to:
http://vger.kernel.org/~acme/perf/perf-4.16.0-rc6.tar.xz
You just expand it and then:
[acme@...et tmp]$ tar xf perf-4.16.0-rc6.tar.xz
[acme@...et tmp]$ cd perf-4.16.0-rc6/
[acme@...et perf-4.16.0-rc6]$ make -C tools/perf install-bin
And check if the problem is present there as well.
If it is, please tell us what is your distro, the output of:
perf report --header-only
Thanks,
- Arnaldo
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