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

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Message-ID: <20200511091244.GB229633@google.com>
Date:   Mon, 11 May 2020 10:12:44 +0100
From:   Quentin Perret <qperret@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Greg KH <gregkh@...uxfoundation.org>, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com, sudeep.holla@....com,
        rafael@...nel.org, viresh.kumar@...aro.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        mcgrof@...nel.org, keescook@...omium.org, yzaikin@...gle.com,
        fweisbec@...il.com, tkjos@...gle.com, kernel-team@...roid.com
Subject: Re: [PATCH 00/14] Modularize schedutil

Hi Peter,

On Friday 08 May 2020 at 16:09:38 (+0200), Peter Zijlstra wrote:
> Do note that (afaik) ARM64 (and Power and probably others) has modules
> in an address space that is not reachable from regular kernel text and
> needs those intermediate trampolines.

Right, but I meant this series in its current form doesn't actively make
things worse for existing users. That is, the act of modularizing
schedutil has no impact on those who compile it in (because I agree that
would be a solid reason for refusing that series), and they are still
perfectly free to do so.

The 'new' users who deliberately decide to compile it as a module will
have to pay that price, but that is their choice. And in the Android
case, as you've understood, this is a price we are ready to pay.

Thanks,
Quentin