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=-2.5 required=3.0 tests=MAILING_LIST_MULTI,SPF_PASS, 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 A5781C282D4 for ; Wed, 30 Jan 2019 07:18:05 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6D20221473 for ; Wed, 30 Jan 2019 07:18:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6D20221473 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id DFF118E0002; Wed, 30 Jan 2019 02:18:04 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id DD5F68E0001; Wed, 30 Jan 2019 02:18:04 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CC59F8E0002; Wed, 30 Jan 2019 02:18:04 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from mail-pf1-f198.google.com (mail-pf1-f198.google.com [209.85.210.198]) by kanga.kvack.org (Postfix) with ESMTP id 87A7B8E0001 for ; Wed, 30 Jan 2019 02:18:04 -0500 (EST) Received: by mail-pf1-f198.google.com with SMTP id 75so19015145pfq.8 for ; Tue, 29 Jan 2019 23:18:04 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:date:from:to :cc:subject:message-id:references:mime-version:content-disposition :in-reply-to:user-agent; bh=mmdDNS+DHTyOMjuCvROx/E6yPyWbz3WbKEsTLrej1y0=; b=FU99M4W8CyeqApaw6DIdYrVQLzdgPW/XCMyNbjAvjkXvAEvrajH9F08lle3WFW/aE9 eaOQTFCJNhb2kvMvNuODvZQ+k4MT8yMS87o6xiTp8NmWqtqOlQ7dl3trWLjZMlDvMdFa dYs4qkwEXtvdLqdToisaZ5FCOCqrCEkunIYhqNJWnwG78PqHq6Son60+ipv+HLoVHRAW QxbcguTTIOEDFUyQbne4c5l1ig8GBBAkbqHdB4hgrdjyoqreMSa2vBrKE0f4CW+nYuFU RM3ROMXPlJOqpt6o038ST/AOSrI7lSz1I6qU0tupNpE5us9d7XnDbD43ikpvXnKe9V0I 6ZqA== X-Original-Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org X-Gm-Message-State: AJcUukdKGUTyaK8NgKZCxjUaRE7ylaOynvjmney1HyGpQ1l1ABLv3EK1 kyWANiZx1UNFitprLtOw5QTkkhGtzjigMxZ/4VxQdPYL1E5rXN+8CrkVtq+nc+MA7enlCtZcH4O 2AGSj6kFZrfbf2F0jFcsGKsKeZxyT5VKtQ1KZHP/g9xgLfRyUWYF3aJdR5FKttuI= X-Received: by 2002:a17:902:a03:: with SMTP id 3mr29529743plo.112.1548832684205; Tue, 29 Jan 2019 23:18:04 -0800 (PST) X-Google-Smtp-Source: ALg8bN7ukgOakcq0Ch7Jj8KnMQ1zPddZnJHAMl43YSZDt89PDG2xGwHa+Q96JJROtFdSemFGAoUz X-Received: by 2002:a17:902:a03:: with SMTP id 3mr29529714plo.112.1548832683456; Tue, 29 Jan 2019 23:18:03 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1548832683; cv=none; d=google.com; s=arc-20160816; b=CFNFrmGO5mjcA9eNFr8Uko3f9Cs2hyFDUthhOTak4VmRYN91Nt9y4l1nbX7mDEXX3Y cdZRKt8JOeRb64pYJuB7h0wM6XYdIgWBOvbEPjGmqbJSjW3Z/Gv6k01Eyxqs14suby9j tvDdLEEZPtosIt/rUa4yNiPfxMev7Vd3bVjSsgr2u1JeRaXQ/LKjIzJEV4VzzxsKMkN9 G1JS4OU5xHkeYDIiNs2t2Fhoc+jU5mmCHuPWAwoMpYN4FDPrUWwLiJuRnJvqz3CzgnjM FuAPX8KHosZ2wgQRSeyMLBCKtfDma9Qbh6iFdBu9Vt2EQHxHVEZKd2dITSXBmxyvvZQC b3dg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=user-agent:in-reply-to:content-disposition:mime-version:references :message-id:subject:cc:to:from:date; bh=mmdDNS+DHTyOMjuCvROx/E6yPyWbz3WbKEsTLrej1y0=; b=EzSJdmLCBe0THep/uTmmcvXUF1VHmUL0feZNq3rtn1sVuNiS5bzOjsp07ZMgR9bThd Wlps7ObYjZDJzUQs6nR/edBBHhMhMyHgUAtSL0cNJ0Hkd6aP7FocRYFpwqqyThvSQ4yK WoD7yzGFyqi9bsZCp61t19PfsAQUSRjSgdqJlrJ4yG5hl2dy99XqFHDF7pKCq81zFjqF WOpiFZC5oRFkKMkKjXryTF7JOxYfsFmjowsxMFJvinhn/vnY2KZ+IvY5N6c4GDmMIQVx d9rn5C5KxqCCJR1ELZ0sVvHHhSbTOzVLP4bEKh0Df0DlUbTpKSdxh6n896KSzCYESuc7 VmDA== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from mx1.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id q20si681417pgl.268.2019.01.29.23.18.03 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 29 Jan 2019 23:18:03 -0800 (PST) Received-SPF: softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id CB835AC5B; Wed, 30 Jan 2019 07:18:01 +0000 (UTC) Date: Wed, 30 Jan 2019 08:17:59 +0100 From: Michal Hocko To: Andrea Arcangeli Cc: lsf-pc@lists.linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Peter Xu , Blake Caldwell , Mike Rapoport , Mike Kravetz , Mel Gorman , Vlastimil Babka , David Rientjes Subject: Re: [LSF/MM TOPIC] NUMA remote THP vs NUMA local non-THP under MADV_HUGEPAGE Message-ID: <20190130071759.GR18811@dhcp22.suse.cz> References: <20190129234058.GH31695@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190129234058.GH31695@redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue 29-01-19 18:40:58, Andrea Arcangeli wrote: > Hello, > > I'd like to attend the LSF/MM Summit 2019. I'm interested in most MM > topics and it's enlightening to listen to the common non-MM topics > too. > > One current topic that could be of interest is the THP / NUMA tradeoff > in subject. > > One issue about a change in MADV_HUGEPAGE behavior made ~3 years ago > kept floating around for the last 6 months (~12 months since it was > initially reported as regression through an enterprise-like workload) > and it was hot-fixed in commit > ac5b2c18911ffe95c08d69273917f90212cf5659, but it got quickly reverted > for various reasons. > > I posted some benchmark results showing that for tasks without strong > NUMA locality the __GFP_THISNODE logic is not guaranteed to be optimal > (and here of course I mean even if we ignore the large slowdown with > swap storms at allocation time that might be caused by > __GFP_THISNODE). The results also show NUMA remote THPs help > intrasocket as well as intersocket. > > https://lkml.kernel.org/r/20181210044916.GC24097@redhat.com > https://lkml.kernel.org/r/20181212104418.GE1130@redhat.com > > The following seems the interim conclusion which I happen to be in > agreement with Michal and Mel: > > https://lkml.kernel.org/r/20181212095051.GO1286@dhcp22.suse.cz > https://lkml.kernel.org/r/20181212170016.GG1130@redhat.com I am definitely interested in discussing this topic and actually wanted to propose it myself. I would add that part of the discussion was proposing a neww memory policy that would effectively enable per-vma node-reclaim like behavior. -- Michal Hocko SUSE Labs