linux-kernel - Re: [PATCH -v2 15/17] sched: Fix migrate

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Message-ID: <20201006135025.GW2628@hirez.programming.kicks-ass.net>
Date:   Tue, 6 Oct 2020 15:50:25 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     tglx@...utronix.de, mingo@...nel.org, linux-kernel@...r.kernel.org,
        bigeasy@...utronix.de, qais.yousef@....com, swood@...hat.com,
        valentin.schneider@....com, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com,
        vincent.donnefort@....com, tj@...nel.org
Subject: Re: [PATCH -v2 15/17] sched: Fix migrate_disable() vs rt/dl balancing

On Tue, Oct 06, 2020 at 09:44:45AM -0400, Steven Rostedt wrote:
> As I've always said. When dealing with real-time systems, you need to be
> careful about how you organize your tasks. Ideally, any RT task that is
> pinned to a CPU shouldn't be sharing that CPU with anything else that may
> be critical.

Due to locks we're always sharing.. :-)