linux-kernel - Re: [PATCH 00/14] Modularize schedutil

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Date:   Wed, 13 May 2020 12:02:13 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Quentin Perret <qperret@...gle.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        the arch/x86 maintainers <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Benjamin Segall <bsegall@...gle.com>,
        Mel Gorman <mgorman@...e.de>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Todd Kjos <tkjos@...gle.com>,
        "Cc: Android Kernel" <kernel-team@...roid.com>
Subject: Re: [PATCH 00/14] Modularize schedutil

On Wed, May 13, 2020 at 10:41:17AM +0100, Quentin Perret wrote:
> Hi Rafael,
> 
> On Tuesday 12 May 2020 at 19:30:52 (+0200), Rafael J. Wysocki wrote:
> > I don't see any technical reason for making schedutil modular in the
> > context of GKI other than to make the GKI image smaller, but I don't
> > expect that to be significant enough.
> 
> The fact that we can make the image smaller, and we give vendors one
> less reason to not-want GKI _is_ desirable IMO.
> 
>   $ size vmlinux.*
>      text	   data	    bss	    dec	    hex	filename
>   19225963	9601976	 491084	29319023	1bf5f6f	vmlinux.after
>   19230599	9603236	 491084	29324919	1bf7677	vmlinux.before
> 
> ^ that's with the series applied. 'before' means sugov is =y, and
> 'after' is sugov =m. So modularizing saves just over 4K on text, and a
> bit of data too. Is it significant? Maybe not. But it's quite likely
> that those who don't use schedutil will find any unnecessary byte to be
> one too many.

It's not significant at all, just always build it in, no one will notice
it, it's just a page or two.  Serial port drivers are way bigger :)

thanks,

greg k-h