Received: by 2002:a25:ad19:0:0:0:0:0 with SMTP id y25csp7763511ybi; Mon, 22 Jul 2019 20:15:10 -0700 (PDT) X-Google-Smtp-Source: APXvYqzKui+hXOfuQxrdb0euONzm8etkNj0eMx2PeThxGfPutHdy+H8FxJsRMd4U1FRVfkgO9Ijq X-Received: by 2002:a17:90a:2430:: with SMTP id h45mr82142304pje.14.1563851710700; Mon, 22 Jul 2019 20:15:10 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1563851710; cv=none; d=google.com; s=arc-20160816; b=GQ9pFbuZOG9JOTyEYC5gbFm82RhPUiDpt1nlFKNMi2hsf6lNpW5o+3KjXWF7cwN37I 8+3Y2vAvG4QID15TNbxVuyEykpK6K15ADi1sUhq/dgvu7JuiPBRM8lGy2OecXYXDNnd6 TapwWBuTUDS7G7IpWyJ3W7ZZ2pjxUhD1Okn5N2kB7cr2rWB7G7av7h4/WvZbTHXWNtkl +bDugF7DLejw4JoB7/V50jyoQFlTzoo6g3QlAgcHPtBIZzt0xIdV/wNyQm/CBg3CByjj 54NbJKT6YRygIZMT/rmNiBNDU0W6rAKSuX3cIs9Q3RfPuC1h8SALKBN8IyB95UdA/20J 137w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date:dkim-signature; bh=pY0LA8u0+TRN74LRfvbZ9clUI8/84sjDmmtXY1EVvV4=; b=gi/J0O9+xXFMnCtjlOxtmeiTXkFUkzT0XtJjINmMRbaB/ar7u7OX/Mp36UA3q1MTvE 207AEebuW7Sff+C6HCekhGkYnRmPaZPPwpgZCLU33FJuGOt9zG40FLIjnuik/29YzyVH eHtcX/KqxRUyCil59O26Ylntzc6OWdQ5qiM/5mgoI08RrQ+zEZbzMeYqCE1oVcLhTuFR RP2VXr26uLC51VO+ZrOgzF8l8Tcbx6LD+baLPNteVXCYXAPxBuNmp4jzinsFb7XXjAaN onjJc16dQE7oJO4CNKiV2IgkTHz26tMip8j3QXfl1XbGKE+0qh4muwSsX1brKR0Jdd48 hnsg== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b=rGWFNPUo; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id t70si14840149pgd.573.2019.07.22.20.14.54; Mon, 22 Jul 2019 20:15:10 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b=rGWFNPUo; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730526AbfGVVJZ (ORCPT + 99 others); Mon, 22 Jul 2019 17:09:25 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:40506 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727845AbfGVVJZ (ORCPT ); Mon, 22 Jul 2019 17:09:25 -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=pY0LA8u0+TRN74LRfvbZ9clUI8/84sjDmmtXY1EVvV4=; b=rGWFNPUoxM9eF46CBWGZYiC4I 12MmieSfQODgiiA2tRe5i/NGtXNT3dyP5lUxqXFQZWoCz5UAVZD9mPmrbmP+JRDnq9yl103cyoulg 32BEnbX04xVNbYnQ/ajs6a5Y/jWPGdliZHznjbTYJYreDIKsztww+Wdy0tfhfgHyGy0gLCEj2RBu5 CVs4UcR5OKm2Uj2/bY3xnwDsZR1wn5+fN0Z093T9FJXNoH1CaA8GzeTbqLyPIEy8Q8oCOdmCcGQo3 aDcU4G0/AUgV5sfcsy5z46EENvsjsf3zRJV8Ko1KTRHyKGWFrmBP57TOyIwMIQ8StPmBnzBTk3G23 RZpO0s0cw==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=worktop.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hpfYf-0003OI-1a; Mon, 22 Jul 2019 21:09:21 +0000 Received: by worktop.programming.kicks-ass.net (Postfix, from userid 1000) id F1B0B980D1F; Mon, 22 Jul 2019 23:09:18 +0200 (CEST) Date: Mon, 22 Jul 2019 23:09:18 +0200 From: Peter Zijlstra To: Nadav Amit Cc: Andy Lutomirski , x86@kernel.org, linux-kernel@vger.kernel.org, Dave Hansen , Thomas Gleixner , Ingo Molnar Subject: Re: [RFC 0/7] x86/percpu: Use segment qualifiers Message-ID: <20190722210918.GM6698@worktop.programming.kicks-ass.net> References: <20190718174110.4635-1-namit@vmware.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190718174110.4635-1-namit@vmware.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 18, 2019 at 10:41:03AM -0700, Nadav Amit wrote: > GCC 6+ supports segment qualifiers. Using them allows to implement > several optimizations: Overall I like this. Nice!