linux-kernel - Re: [PATCH 1/4] x86/mm/tlb: Revert the recent lazy TLB patches

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Message-ID: <15474e3aa44fe9f67b6fa6ddb67ff8fc0e6831ad.camel@surriel.com>
Date:   Wed, 22 Aug 2018 18:11:02 -0400
From:   Rik van Riel <riel@...riel.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Andrew Lutomirski <luto@...nel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Will Deacon <will.deacon@....com>,
        Jann Horn <jannh@...gle.com>,
        Adin Scannell <ascannell@...gle.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH 1/4] x86/mm/tlb: Revert the recent lazy TLB patches

On Wed, 2018-08-22 at 14:37 -0700, Linus Torvalds wrote:
> On Wed, Aug 22, 2018 at 8:46 AM Peter Zijlstra <peterz@...radead.org>
> wrote:
> > 
> > Revert [..] in order to simplify the TLB invalidate fixes for x86.
> > We'll try again later.
> 
> Rik, I assume I should take your earlier "yeah, I can try later" as
> an
> ack for this?

Yes, feel free to add my Acked-by: to all these
patches.

Patch 3/4 is not ideal, with the slow path in
tlb_remove_table sending two IPIs (one to every
CPU, one to the CPUs in the mm_cpumask), but
that is a slow path we should not be hitting
much anyway.

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