linux-kernel - Re: [4.9-rc1] Build-time 2x slower

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Message-ID: <CA+55aFy8xV7MZDQTOghuaozg4crCb7GHF6c+y9038=Wd1S852g@mail.gmail.com>
Date:   Wed, 19 Oct 2016 08:29:14 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Jörg Otte <jrg.otte@...il.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc:     Michal Marek <mmarek@...e.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Ming Lei <tom.leiming@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [4.9-rc1] Build-time 2x slower

On Wed, Oct 19, 2016 at 4:07 AM, Jörg Otte <jrg.otte@...il.com> wrote:
>
> Additional info: I usally use schedutil governor.
> If I switch to performance governor problems go away.
> Maybe a cpufreq problem?

Oh, I completely misread the original bug report, and then didn't read
your confirmation email right.

I thought you had a slower build of the different kernels (when
building on the same kernel), and that the _build_ itself had slowed
down for some reason. But you're actually saying that doing the _same_
build actually takes longer when running on 4.9-rc1.

My bad.

There are a few small cpufreq changes there in between commit
29fbff8698fc (that you reported was fine - please tell me I got _that_
right, at least?) and 4.9-rc1. Adding Rafael to the cc.

That said, none of them look all that likely to me. It *would* be good
if you could bisect it a bit (perhaps not fully, but a couple of
bisection steps to narrow down what area it is).

                 Linus