linux-kernel - Re: [patch v12 09/13] task isolation: add preempt notifier to sync per-CPU vmstat dirty info to thread info

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Message-ID: <878rrryp8y.ffs@tglx>
Date:   Wed, 27 Apr 2022 09:11:41 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Marcelo Tosatti <mtosatti@...hat.com>, linux-kernel@...r.kernel.org
Cc:     Nitesh Lal <nilal@...hat.com>,
        Nicolas Saenz Julienne <nsaenzju@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Alex Belits <abelits@...its.com>, Peter Xu <peterx@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Oscar Shiang <oscar0225@...email.tw>,
        Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [patch v12 09/13] task isolation: add preempt notifier to sync
 per-CPU vmstat dirty info to thread info

On Tue, Mar 15 2022 at 12:31, Marcelo Tosatti wrote:
> If a thread has task isolation activated, is preempted by thread B,
> which marks vmstat information dirty, and is preempted back in,
> one might return to userspace with vmstat dirty information on the 
> CPU in question.
>
> To address this problem, add a preempt notifier that transfers vmstat dirty
> information to TIF_TASK_ISOL thread flag.

How does this compile with CONFIG_KVM=n?

Thanks,

        tglx