Received: by 2002:ac0:a5a6:0:0:0:0:0 with SMTP id m35-v6csp112434imm; Wed, 5 Sep 2018 16:02:56 -0700 (PDT) X-Google-Smtp-Source: ANB0VdaNt2jsJf65Ku4o/k0MvxNhxt8kGa5A6njNGk5ehfrL8dx4x6XYqiP+qHEvMWaXBvHF+ZE4 X-Received: by 2002:a17:902:724c:: with SMTP id c12-v6mr40806656pll.326.1536188576629; Wed, 05 Sep 2018 16:02:56 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1536188576; cv=none; d=google.com; s=arc-20160816; b=UIE4W0LNXDk0pq+QphoPOruwT1zx6ozM6OH9cqW+hEbO13IELlUgM5eV5MSI/l6ltv vBuY9zkac7ra1tiACD5piyKcb8zlYikKJgHZaineHia4iHWkuRfrtje0esIv5qYyhbi7 AoZgtBoxl9/JITmba3Omdq+bk902uVs3E/psasH+exubptlesilFotUs1vto/MkiLUA4 YlqqP0pXj7ZKhHz+RxBbr6Mgq0NCZBPximgoi8PSWFM7/XmkIli2gtwiLuKOXuQAZgdJ +o+gGAzTPOiy5uUTIcOF4pY/KApTM099JUOztuDjRbDy/OyVvmL76NlHXvgjGVq+EBdj vG8Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:user-agent:references :message-id:in-reply-to:subject:cc:to:from:date; bh=nN+P0PkYGEZGlY7ICoWDDPSJsgu53V7gugbjNYXgN+s=; b=wkOuFjLqpi9CmQwlAEBSDT5NJPsszz5MutQf0DNbZJ5wvQ8UYsDRwELwAO1jcZUk6d z38HoPSyBbG8MU7rE9WiY0s8W3YiTZdAYBXFl+J7uCbzNfNHmf1n3zcczydhVmjaOgWG M6LHwZaGA5NkLxSpmXXg0qDPzdJzqQbe3fAW+FsUuiJ5YYQJW3D2vnLGY3Rq3jHN9H0i F1TRFLjzfh4S2YXdXMe+bKvTzx1hCJyoqXDAmNLS7Zw4vHbGphpF59p+IpgRai9tHrXf Fzf9P5FadcMw2NTCrRzTfzclwnCC1a5p+31s4rUni4vf3vnYGqTHUFycYofq6Qu3gqar sO0g== ARC-Authentication-Results: i=1; mx.google.com; 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 92-v6si3492573plw.81.2018.09.05.16.02.40; Wed, 05 Sep 2018 16:02:56 -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; 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 S1727694AbeIFDdn (ORCPT + 99 others); Wed, 5 Sep 2018 23:33:43 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:60554 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727604AbeIFDdn (ORCPT ); Wed, 5 Sep 2018 23:33:43 -0400 Received: from p4fea45ac.dip0.t-ipconnect.de ([79.234.69.172] helo=nanos) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1fxgnP-0008At-MV; Thu, 06 Sep 2018 01:01:11 +0200 Date: Thu, 6 Sep 2018 01:01:09 +0200 (CEST) From: Thomas Gleixner To: Laurent Dufour cc: Christopher Lameter , Daniel Jordan , linux-kernel@vger.kernel.org, "linux-mm@kvack.org" , Aaron Lu , alex.kogan@oracle.com, akpm@linux-foundation.org, boqun.feng@gmail.com, brouer@redhat.com, dave@stgolabs.net, dave.dice@oracle.com, Dhaval Giani , ktkhai@virtuozzo.com, Pavel.Tatashin@microsoft.com, paulmck@linux.vnet.ibm.com, shady.issa@oracle.com, tariqt@mellanox.com, tim.c.chen@intel.com, vbabka@suse.cz, longman@redhat.com, yang.shi@linux.alibaba.com, shy828301@gmail.com, Huang Ying , subhra.mazumdar@oracle.com, Steven Sistare , jwadams@google.com, ashwinch@google.com, sqazi@google.com, Shakeel Butt , walken@google.com, rientjes@google.com, junaids@google.com, Neha Agarwal Subject: Re: Plumbers 2018 - Performance and Scalability Microconference In-Reply-To: <839e2703-1588-0873-00a7-d04810f403cf@linux.vnet.ibm.com> Message-ID: References: <1dc80ff6-f53f-ae89-be29-3408bf7d69cc@oracle.com> <01000165aa490dc9-64abf872-afd1-4a81-a46d-a50d0131de93-000000@email.amazonses.com> <839e2703-1588-0873-00a7-d04810f403cf@linux.vnet.ibm.com> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 5 Sep 2018, Laurent Dufour wrote: > On 05/09/2018 17:10, Christopher Lameter wrote: > > Large page sizes also reduce contention there. > > That's true for the page fault path, but for process's actions manipulating the > memory process's layout (mmap,munmap,madvise,mprotect) the impact is minimal > unless the code has to manipulate the page tables. And how exactly are you going to do any of those operations _without_ manipulating the page tables? Thanks, tglx