linux-kernel - Re: [PATCH] x86/tlb: Revert: Align TLB invalidation info

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Message-ID: <265A9BFA-8111-4ED8-8B49-0A15BA4EF9BA@vmware.com>
Date:   Wed, 17 Apr 2019 04:52:39 +0000
From:   Nadav Amit <namit@...are.com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>
Subject: Re: [PATCH] x86/tlb: Revert: Align TLB invalidation info

> On Apr 16, 2019, at 11:28 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> 
> On Tue, Apr 16, 2019 at 10:45:05AM -0700, Linus Torvalds wrote:
>> So very much Ack on that patch, but maybe we could do a bit more cleanup here?
> 
> Yeah, Nadav was going to try and clean that up. But I figured we should
> get this revert in and backported while it's hot :-)

I will get to it hopefully next week. I need to do some benchmarking to see
the impact of getting it off the stack, although usually the IPI itself
dominates the TLB shootdown performance overhead.