linux-kernel - Re: [GIT PULL] perf changes for v3.12

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Message-ID: <CA+55aFyyJpCC0EFfPpGYi+6goWbA+LZbrkFcLNW3x8xYHfKvdQ@mail.gmail.com>
Date:	Wed, 4 Sep 2013 10:53:47 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] perf changes for v3.12

On Tue, Sep 3, 2013 at 6:29 AM, Ingo Molnar <mingo@...nel.org> wrote:
>
> Please pull the latest perf-core-for-linus git tree from:

I don't think this is new at all, but I just tried to do a perf
record/report of "make -j64 test" on git:

It's a big perf.data file (1.6G), but after it has done the
"processing time ordered events" thing it results in:

┌─Warning:───────────────────────────────────┐
│Processed 8672030 events and lost 71 chunks!│
│Check IO/CPU overload!                      │
│                                            │
│                                            │
│Press any key...                            │
└────────────────────────────────────────────┘

and then it just hangs using 100% CPU time. Pressing any key doesn't
do anything.

It may well still be *doing* something, and maybe it will come back
some day with results. But it sure doesn't show any indication that it
will.

Try this (in a current git source tree: note, by "git" I actually mean
git itself, not some random git repository)::

    perf record -g -e cycles:pp make -j64 test >& out
    perf report

maybe you can reproduce it.

                Linus