linux-kernel - Re: [PATCH v2] sched/core: Don't use dying mm as active

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Date:   Mon, 29 Jul 2019 11:28:04 -0400
From:   Rik van Riel <riel@...riel.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Waiman Long <longman@...hat.com>
Cc:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Phil Auld <pauld@...hat.com>, Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH v2] sched/core: Don't use dying mm as active_mm of
 kthreads

On Mon, 2019-07-29 at 17:03 +0200, Peter Zijlstra wrote:

> The 'sad' part is that x86 already switches to init_mm on idle and we
> only keep the active_mm around for 'stupid'.

Wait, where do we do that?

> Rik and Andy were working on getting that 'fixed' a while ago, not
> sure
> where that went.

My lazy TLB stuff got merged last year. 

Did we miss a spot somewhere, where the code still
quietly switches to init_mm for no good reason?

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