linux-kernel - Re: [ANNOUNCE] v5.6.2-rt1

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Date:   Wed, 15 Apr 2020 13:12:35 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Juri Lelli <juri.lelli@...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] v5.6.2-rt1

On 2020-04-08 09:00:13 [+0200], Juri Lelli wrote:
> Hi,
Hi,

> On 03/04/20 19:04, Sebastian Andrzej Siewior wrote:
> > Dear RT folks!
> > 
> > I'm pleased to announce the v5.6.2-rt1 patch set. 
> > 
> > Changes since v5.4.28-rt19:
> > 
> >   - Rebase to v5.6.2
> 
> I was reviewing the new set and I couldn't find v5.4.28-rt19
> 6dbbc833c99f ("mm: perform lru_add_drain_all() remotely"). Don't think
> it has been squashed either.
> 
> Am I wrong? If not, why was that left out?

I was going to drop it from v5.4 but kept it last minute. I announced in
	https://lkml.kernel.org/r/20200309171350.kjb3pdjazhxm2li2@linutronix.de

that the problem it fixes is not limited to RT so we need a solution for
both config switches. The current plan for local-locks is not to work
cross CPU because it breaks the local_irq_save() / preempt_disable()
replacement which is something this patch relies on.
The worker triggered via vmstat_update() is also blocked if the user
task runs at an elevated priority for longer time.

> Thanks!
> 
> Juri

Sebastian