Re: [PATCH 7/8] kernel/fork: Only cache the VMAP stack in finish_task_switch().
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- To: Andy Lutomirski <luto@xxxxxxxxxx>
- Subject: Re: [PATCH 7/8] kernel/fork: Only cache the VMAP stack in finish_task_switch().
- From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
- Date: Mon, 14 Feb 2022 13:24:03 +0100
- Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, Ben Segall <bsegall@xxxxxxxxxx>, Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>, Dietmar Eggemann <dietmar.eggemann@xxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Juri Lelli <juri.lelli@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Vincent Guittot <vincent.guittot@xxxxxxxxxx>
- In-reply-to: <YgpGnFlTS+2Ugfw4@linutronix.de>
- References: <20220125152652.1963111-1-bigeasy@linutronix.de> <20220125152652.1963111-8-bigeasy@linutronix.de> <00f9c7a6-2d1d-f871-e9bc-00e2217f40f9@kernel.org> <YgpGnFlTS+2Ugfw4@linutronix.de>
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
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