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Message-ID: <20190729154419.GJ31398@hirez.programming.kicks-ass.net>
Date: Mon, 29 Jul 2019 17:44:19 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Rik van Riel <riel@...riel.com>
Cc: Waiman Long <longman@...hat.com>, 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, Jul 29, 2019 at 11:28:04AM -0400, Rik van Riel wrote:
> 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?
drivers/idle/intel_idle.c: leave_mm(cpu);
drivers/acpi/processor_idle.c: acpi_unlazy_tlb(smp_processor_id());
> > 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.
Yes, but we never got around to getting rid of active_mm for x86, right?
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