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

[Linus Torvalds]

On Tue, Sep 3, 2013 at 6:29 AM, Ingo Molnar <mingo@xxxxxxxxxx> 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:

ââWarning:ââââââââââââââââââââââââââââââââââââ
âProcessed 8672030 events and lost 71 chunks!â
âCheck IO/CPU overload!                      â
â                                            â
â                                            â
âPress any key...                            â
ââââââââââââââââââââââââââââââââââââââââââââââ

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
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