linux-kernel - Re: [RFC PATCH v4 2/3] sched: Avoid placing RT threads on cores handling long softirqs

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Message-ID: <CANDhNCrGoWWaoYfsqVOqqNBsbZk5vXjsktrqKYM92-9LpD5P9w@mail.gmail.com>
Date:   Tue, 4 Oct 2022 18:13:52 -0700
From:   John Stultz <jstultz@...gle.com>
To:     Hillf Danton <hdanton@...a.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        "Connor O'Brien" <connoro@...gle.com>,
        Qais Yousef <qais.yousef@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC PATCH v4 2/3] sched: Avoid placing RT threads on cores
 handling long softirqs

On Tue, Oct 4, 2022 at 5:22 PM Hillf Danton <hdanton@...a.com> wrote:
> On 3 Oct 2022 19:29:36 -0700 John Stultz <jstultz@...gle.com>
> >
> > Why would ksoftirqd preempt the rt task?
> >
> For example the kthread becomes sensitive to latency.

Again, my apologies, I'm still not sure I am following. Could you
expand a bit on the case you're concerned about? Is it the case where
the ksoftirqd thread is configured to run at higher rtprio?

thanks
-john