linux-kernel - Re: x86 TLB flushing: INVPCID vs. deferred CR3 write

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Message-ID: <20171206093705.y74zuyexf44sl6n4@hirez.programming.kicks-ass.net>
Date:   Wed, 6 Dec 2017 10:37:05 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     the arch/x86 maintainers <x86@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        "Kleen, Andi" <andi.kleen@...el.com>,
        "Chen, Tim C" <tim.c.chen@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: x86 TLB flushing: INVPCID vs. deferred CR3 write

On Tue, Dec 05, 2017 at 05:27:31PM -0800, Dave Hansen wrote:
> tl;dr: Kernels with pagetable isolation using INVPCID compile kernels
> 0.58% faster than using the deferred CR3 write.  This tends to say that
> we should leave things as-is and keep using INVPCID, but it's far from
> definitive.

Much appreciated, thanks Dave!