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

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Date:   Thu, 20 Oct 2022 01:15:01 +0100
From:   Qais Yousef <qyousef@...alina.io>
To:     John Stultz <jstultz@...gle.com>
Cc:     Alexander Gordeev <agordeev@...ux.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Connor O'Brien <connoro@...gle.com>,
        John Dias <joaodias@...gle.com>, Rick Yiu <rickyiu@...gle.com>,
        John Kacur <jkacur@...hat.com>,
        Qais Yousef <qais.yousef@....com>,
        Chris Redpath <chris.redpath@....com>,
        Abhijeet Dharmapurikar <adharmap@...cinc.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>, kernel-team@...roid.com,
        "J . Avila" <elavila@...gle.com>
Subject: Re: [PATCH RFC v4 2/3] sched: Avoid placing RT threads on cores
 handling long softirqs

On 10/19/22 15:09, John Stultz wrote:

> I fret there are some edge cases where on the target cpu softirqs
> might be pending but ksoftirqd isn't running yet maybe due to a
> lowish-prio rt task - such that the cpu could still be considered a
> good target. But this seems a bit of a stretch.

Could using ksoftirqd_running() instead help with robustness here?


Cheers

--
Qais Yousef