linux-kernel - Re: [ANNOUNCE] v5.2.21-rt15

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Message-ID: <20191217081449.xsrfpma4frgynkmg@linutronix.de>
Date:   Tue, 17 Dec 2019 09:14:49 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Richard Cochran <richardcochran@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [ANNOUNCE] v5.2.21-rt15

On 2019-12-16 20:45:49 [-0800], Richard Cochran wrote:
> On Mon, Dec 16, 2019 at 06:34:16PM +0100, Sebastian Andrzej Siewior wrote:
> > 
> >   - Since the migrate_disable() rework, with heave changing of the
> >     task's affinity mask the kernel could issue a warning in
> >     migrate_enable() and crash later.
> 
> What is "heave changing?"

Sorry. "heavy changing". You need to change the affinity mask of a task
very often and one requirement is that new affinity mask does not
contain a CPU on which the task is currently running.

> Just Curious,
> 
> Richard

Sebastian