From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.1 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3062CC468C6 for ; Thu, 19 Jul 2018 09:14:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D1540206B7 for ; Thu, 19 Jul 2018 09:14:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="tMUQfbR0" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D1540206B7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730821AbeGSJ4L (ORCPT ); Thu, 19 Jul 2018 05:56:11 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:36910 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726704AbeGSJ4L (ORCPT ); Thu, 19 Jul 2018 05:56:11 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=JeFK8tOezHXJTwWgDOi2sa3rSt1ZV2Xb/G0KT5OadUc=; b=tMUQfbR0eGMYYShpQIvBioLYX p3lKM5/17XfCyK8jEGxShgtApr2zFPOcKEqsYlWc/UmxSdIbzdnY8hrJ3dKsE2VX3NFx7Ci1ZMsVA 8nmo6PVxbJZ65RDr54BvSuxThL8VnuCg2vdWri9D8GfmXFJIVHcOwNNE44o3nzNFvCtRwEwS/si9K 5/TuaObCaK5Gj2v35yDl1HKIlqXYcGMlIbYzjxRFuNcZpfrT/OfPHdQU8g6tbHA0Mv+ar08Mx5N5/ SqnmFdhIBcgpUdO40l7ZoyxjY09V8rUqrqIh/F7dJFSTGbCqc0syxwB99nP+DYDlnLt2CneH9lTvH opr0r2uWw==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1fg50R-0007Wf-IW; Thu, 19 Jul 2018 09:13:51 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 41B2020289330; Thu, 19 Jul 2018 11:13:49 +0200 (CEST) Date: Thu, 19 Jul 2018 11:13:49 +0200 From: Peter Zijlstra To: Rik van Riel Cc: songliubraving@fb.com, linux-kernel@vger.kernel.org, dave.hansen@intel.com, hpa@zytor.com, tglx@linutronix.de, mingo@kernel.org, torvalds@linux-foundation.org, linux-tip-commits@vger.kernel.org Subject: Re: [tip:x86/mm] x86/mm/tlb: Make lazy TLB mode lazier Message-ID: <20180719091349.GY2494@hirez.programming.kicks-ass.net> References: <20180716190337.26133-5-riel@surriel.com> <20180717113330.GU2476@hirez.programming.kicks-ass.net> <08AC2AF2-17DE-4416-BBBD-B6B950D20906@surriel.com> <20180718160007.GS2494@hirez.programming.kicks-ass.net> <081E558D-DB34-4A18-A35C-896BC47F6EBA@surriel.com> <20180718182359.GW2494@hirez.programming.kicks-ass.net> <477353D9-BA10-4AAB-ACC4-DDFDAE63895B@surriel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <477353D9-BA10-4AAB-ACC4-DDFDAE63895B@surriel.com> User-Agent: Mutt/1.10.0 (2018-05-17) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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.