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

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Date:   Mon, 4 Dec 2017 10:07:57 +0100
From:   Juri Lelli <juri.lelli@...hat.com>
To:     Steven Rostedt <rostedt@...dmis.org>
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 04/12/17 03:09, Steven Rostedt wrote:
> 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.
> 

Right, sorry. I meant num_online_cpus() == 1.

Best,

Juri