From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl0-f72.google.com (mail-pl0-f72.google.com [209.85.160.72]) by kanga.kvack.org (Postfix) with ESMTP id CAF906B03B4 for ; Wed, 6 Dec 2017 04:37:16 -0500 (EST) Received: by mail-pl0-f72.google.com with SMTP id w15so162269plp.14 for ; Wed, 06 Dec 2017 01:37:16 -0800 (PST) Received: from bombadil.infradead.org (bombadil.infradead.org. [65.50.211.133]) by mx.google.com with ESMTPS id v77si1751622pfa.223.2017.12.06.01.37.11 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 06 Dec 2017 01:37:11 -0800 (PST) Date: Wed, 6 Dec 2017 10:37:05 +0100 From: Peter Zijlstra Subject: Re: x86 TLB flushing: INVPCID vs. deferred CR3 write Message-ID: <20171206093705.y74zuyexf44sl6n4@hirez.programming.kicks-ass.net> References: <3062e486-3539-8a1f-5724-16199420be71@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3062e486-3539-8a1f-5724-16199420be71@intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Dave Hansen Cc: the arch/x86 maintainers , Andy Lutomirski , LKML , Linux-MM , "Kleen, Andi" , "Chen, Tim C" , Linus Torvalds 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! -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org