linux-kernel - Re: [ANNOUNCE] v5.4.26-rt17

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Message-ID: <20200330154110.GA2975@zipoli.concurrent-rt.com>
Date:   Mon, 30 Mar 2020 11:41:10 -0400
From:   Joe Korty <joe.korty@...current-rt.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
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] v5.4.26-rt17

On Fri, Mar 20, 2020 at 08:28:30PM +0100, Sebastian Andrzej Siewior wrote:
> Dear RT folks!
> 
> I'm pleased to announce the v5.4.26-rt17 patch set. 
> 
> Changes since v5.4.26-rt16:
> 
>   - Revert the "cross CPU pagevec" access with a static key switch. The
>     old behaviour has been almost fully restored: There is no cross CPU
>     access of the local_lock. Instead the workqueue is scheduled on
>     remote CPU like in the !RT case.

[try #2]
This reversion fixes the oops I was getting when CONFIG_PREEMPT_RT=n,
CONFIG_PREEMPT=y, with nohz_full operational, when the system is under
heavy memory pressure (mem=4G on the kernel command line, 8 cpu setup,
make -j11 kernel build).