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 CA72FC67790 for ; Wed, 25 Jul 2018 14:38:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7963020852 for ; Wed, 25 Jul 2018 14:38:58 +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="hs3+90oM" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7963020852 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 S1729361AbeGYPuz (ORCPT ); Wed, 25 Jul 2018 11:50:55 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:33304 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727881AbeGYPuy (ORCPT ); Wed, 25 Jul 2018 11:50:54 -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=flikRzjsIyrBZ/3YFHHY9qeSJTh3nRKuMjJpCdb8Azo=; b=hs3+90oMaqXuvTC+Gp839Z29A Op9AekYZFvBjFIWfopiDNgK1kucHIECpQ/exFhia+GvGzx5f+t0mqye++jUgn+L26v7kmbZEZNeIa z/Fc24PXxWTM0ZGFkAU2O4leWmLBdvK46kUzy/pGFJQfpOrFQ6StkfV6olCyUo4YguWT/BYkHsUDy 2+wS5s5Kw/FXJBG05JUo9U20BHCuvRtk83iwOoVnfRoK32dLItgDQcF3YZH5VNnInD7Giwr5QO1kC YgDC6wbBomdJUslvYvV0ZwnV9E3GOwiO/irYTAzH/+L0vSeJvflx0GiF2aDstF8BneB9gnn5doWu6 tcOYttIkw==; Received: from willy by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1fiKwE-0001bM-9u; Wed, 25 Jul 2018 14:38:50 +0000 Date: Wed, 25 Jul 2018 07:38:50 -0700 From: Matthew Wilcox To: "Elliott, Robert (Persistent Memory)" Cc: Cannon Matthews , Michal Hocko , Mike Kravetz , Andrew Morton , "Kirill A. Shutemov" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , Andres Lagar-Cavilla , Salman Qazi , Paul Turner , David Matlack , Peter Feiner , Alain Trinh Subject: Re: [PATCH v2] RFC: clear 1G pages with streaming stores on x86 Message-ID: <20180725143850.GA2886@bombadil.infradead.org> References: <20180724210923.GA20168@bombadil.infradead.org> <20180725023728.44630-1-cannonmatthews@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.2 (2017-12-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 25, 2018 at 05:02:46AM +0000, Elliott, Robert (Persistent Memory) wrote: > Even with that, one CPU core won't saturate the memory bus; multiple > CPU cores (preferably on the same NUMA node as the memory) need to > share the work. It's probably OK to not saturate the memory bus; it'd be nice if other cores were allowed to get work done. If your workload is single-threaded, you're right, of course, but who has a single-threaded workload these days?!