linux-kernel - Re: [tip:x86/mm] x86/mm/tlb: Make lazy TLB mode lazier

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Message-ID: <20180719091349.GY2494@hirez.programming.kicks-ass.net>
Date:   Thu, 19 Jul 2018 11:13:49 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Rik van Riel <riel@...riel.com>
Cc:     songliubraving@...com, linux-kernel@...r.kernel.org,
        dave.hansen@...el.com, hpa@...or.com, tglx@...utronix.de,
        mingo@...nel.org, torvalds@...ux-foundation.org,
        linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/mm] x86/mm/tlb: Make lazy TLB mode lazier

On Wed, Jul 18, 2018 at 02:51:45PM -0400, Rik van Riel wrote:

> > Ah, ok. I wasn't entirely sure the new lazy was purely for the idle
> > case. But yes, the KVM paravirt thing should get the idle case right.
> > 
> Not just idle, but also running in kernel threads like ksoftirqd,
> kworker, kswapd, etc.

Right, that's what I thought.

> However, kvm_flush_tlb_other calls
> native_flush_tlb_other, so it should get that optimization automatically
> from my patch series.

Aah, seems I forgot that part, then yes indeed, it all works.