linux-kernel - Re: [PATCH 7/8] kernel/fork: Only cache the VMAP stack in finish_task

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Message-ID: <YgpJ41q35k+KCsk4@linutronix.de>
Date:   Mon, 14 Feb 2022 13:24:03 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH 7/8] kernel/fork: Only cache the VMAP stack in
 finish_task_switch().

On 2022-02-14 13:10:06 [+0100], To Andy Lutomirski wrote:
> 
> I think I could use the first few bytes of the stack as a RCU-head. Let
> me try that.

task::stack_vm_area and ::stack. Now I remember why I went for that bit.
But I do have (hopefully) a better idea now.

> > --Andy

Sebastian