linux-kernel - Re: [PATCH v9 4/5] tick/nohz_full: Ensure quiet_vmstat() is called on exit to user-mode when the idle tick is stopped

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Message-ID: <20221214130040.GC1930067@lothringen>
Date:   Wed, 14 Dec 2022 14:00:40 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Marcelo Tosatti <mtosatti@...hat.com>
Cc:     atomlin@...hat.com, cl@...ux.com, tglx@...utronix.de,
        mingo@...nel.org, peterz@...radead.org, pauld@...hat.com,
        neelx@...hat.com, oleksandr@...alenko.name,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v9 4/5] tick/nohz_full: Ensure quiet_vmstat() is called
 on exit to user-mode when the idle tick is stopped

On Tue, Dec 06, 2022 at 01:18:30PM -0300, Marcelo Tosatti wrote:
> From: Aaron Tomlin <atomlin@...hat.com>
> 
> This patch ensures CPU-specific vmstat differentials do not remain
> when the scheduling-tick is stopped and before exiting to user-mode
> in the context of nohz_full only.

Please also don't forget to mention why this change is needed.

Thanks.