linux-kernel - Re: [PATCH] sched/rt: Do not pull from current CPU if only one cpu to pull

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Message-ID: <20171204030916.0cf09b0f@vmware.local.home>
Date:   Mon, 4 Dec 2017 03:09:16 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Juri Lelli <juri.lelli@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Daniel Wagner <wagi@...om.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] sched/rt: Do not pull from current CPU if only one cpu
 to pull

On Mon, 4 Dec 2017 08:45:17 +0100
Juri Lelli <juri.lelli@...hat.com> wrote:

> Right. I was wondering however if for the truly UP case we shouldn't be
> initiating/queueing callbacks (pull/push) at all?

If !CONFIG_SMP then it's not compiled in. The issue came up when Daniel
ran a CONFIG_SMP kernel on an arch that only supports UP.

> 
> DEADLINE doesn't use (yet?) the PUSH_IPI, but we will need a similar
> patch to keep logics aligned.

Maybe.

-- Steve