linux-kernel - Re: [GIT PULL] RCU updates for v5.1

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Date:   Tue, 5 Mar 2019 18:13:21 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        "Paul E. McKenney" <paulmck@...ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] RCU updates for v5.1

On Tue, Mar 5, 2019 at 4:03 AM Ingo Molnar <mingo@...nel.org> wrote:
>
> Please pull the latest core-rcu-for-linus git tree from:
>
>    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-rcu-for-linus

Hmm. I think this made my build time explode.

I'm bisecting, but it looks like my allmodconfig builds went from ~31
min to ~39 min with this pull.

NOTE! I'm  not saying that the kernel slowed down. Just the *build*
(with the same kernel) slowed down.

It's odd, and maybe I did something wrong, so I'll have to
double-check the numbers, but I thought I'd mention it in case
somebody goes "Ahh, I did X to the include files, so now every
compiler invocation probably sees all of xyz and that will slow things
down enormously".

            Linus