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

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Message-ID: <20200508140938.GA3344@hirez.programming.kicks-ass.net>
Date:   Fri, 8 May 2020 16:09:38 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Quentin Perret <qperret@...gle.com>
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

On Fri, May 08, 2020 at 02:05:07PM +0100, Quentin Perret wrote:
> So, all in all, I don't think the series actively makes schedutil worse
> by adding out-of-line calls in the hot path or anything like that, and

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.

While that's probably not a very big deal, it does increase L1$ pressure
and things.