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, URIBL_BLOCKED,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 5BDA5C282E3 for ; Thu, 25 Apr 2019 08:43:07 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 26246217FA for ; Thu, 25 Apr 2019 08:43:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 26246217FA 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 7C2C76B0005; Thu, 25 Apr 2019 04:43:06 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7738C6B0006; Thu, 25 Apr 2019 04:43:06 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 664586B0007; Thu, 25 Apr 2019 04:43:06 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-ed1-f72.google.com (mail-ed1-f72.google.com [209.85.208.72]) by kanga.kvack.org (Postfix) with ESMTP id 13CB76B0005 for ; Thu, 25 Apr 2019 04:43:06 -0400 (EDT) Received: by mail-ed1-f72.google.com with SMTP id s21so11312454edd.10 for ; Thu, 25 Apr 2019 01:43:06 -0700 (PDT) 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=6bCTRhaJZcHleBm+PC1JlrZO4wAxSCu2khUzsJ1UBUs=; b=unfXQhxADGeSbFpfg3whXIAmkYTUH/2Ceo/5W1fmJppoAkYD+esA0xHZY5wkNCL024 OZSAdw7e36+49jmb9fEz1yoICe4EtIbyAEOzsSjXRK/D5RzWpIo+0+W/ddiPG74rQCe7 WT6AYFzzKYGJ0LfZJOFdR+tQNEQQJQtr3Y9JU6JzGH8bi8EZ1ciReHh8rnBEYuBtBGbm YRG1loncGcfITOeZPJapKfo7SUNu6hfTpLvcaMpP6GtqwA+T/B1h2cswt5Cgl0qcFp03 2329ZU1RxSur+ZmB09kdLiQxwLWb4KjTsMRSQyGO7hg4oFmtiEd6rkMymyNxv6IyZvig rdMw== 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: APjAAAWA3tO5x2WpB3wUyZg10ItkP+LjUO/xqw5e9zXWyKTH4MZnI9RE O7I2OrjPoS78Ew5Ck8pmwA8nkbAlRATUbWlP9xIDtivl12DeHLlaGCjEdquSpYSRU1m9Giymubd Q9EwDGYOmgoQgbfWXMjW1K9pVL47FSLgvqvlImEBgAHzjMtNTWtAHxGeccuDtDhI= X-Received: by 2002:a50:89b9:: with SMTP id g54mr22346168edg.37.1556181785557; Thu, 25 Apr 2019 01:43:05 -0700 (PDT) X-Google-Smtp-Source: APXvYqxXhblkermAnQdiW/y2qj4dgWHi0nUkIXRHEeeUOx1P3K1OFQX98n7B89+x8hbO2KplR67W X-Received: by 2002:a50:89b9:: with SMTP id g54mr22346114edg.37.1556181784539; Thu, 25 Apr 2019 01:43:04 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1556181784; cv=none; d=google.com; s=arc-20160816; b=fUTKz9TvuBsOI55SZNSo9QZZi1RjBCq2erhbCDEwhWfacEBo0oGfB4Iru51xmJFpVz I1L6bj6pdCnLOIMlZ2xeg767IVON5oBjFLWwdALjmUWieLTw85TIdi9g+UW0SjqKmJRC l6APlZXt5cJRDjwpbzCrvGu2eVW1z3D3IjP0eYx5GuwPUx0eL6j3PDCCvVRSiTNfX2z5 Dl0hs4ofITMxNHp8y9wsUtDNbnE/ktFfVM8z8wxfQMU+z+WtPR1XTRIhQI04/hKAmA4F CVD2hIzseSuQLnLWzicY3eSMW+vpShGWe8J9RwsumiPUdAfNtP8QxbCpiGUhD0W/bHTO 44kw== 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=6bCTRhaJZcHleBm+PC1JlrZO4wAxSCu2khUzsJ1UBUs=; b=HimuLXszl3Zh0yrssYZxzHz7XHTZ44xgToVkwhCj5Dpn5z3WKzq2nBf0k8MYyzihzf ePqayA+dLGMtFJjFptZfFNZ7yTRxjPvsLEKWQ4cbdzeJvOkgM4ypDw61cmx0N+vaUGGn DRIVqT93fOpFQcI19jr6xHT7kZVTD6YthbkLULxv6I43RkumO45BoCbK+B2bD0w6uC1e kAtoIO2wEJ+rG+4ozFBRqc3SEXkjxPpmKUlS6VWjHZMVJaLycbw+IHYPjkQIbUnrUqzK qo4236X6DMxY6TEVNjAKxftBQC+1bx9MXmhDqrznu4P7xuykXCK1EYTf7f7YhpUF+14q 02wA== 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 x4si1439721edh.33.2019.04.25.01.43.04 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 25 Apr 2019 01:43:04 -0700 (PDT) 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 A9156AD18; Thu, 25 Apr 2019 08:43:03 +0000 (UTC) Date: Thu, 25 Apr 2019 10:43:02 +0200 From: Michal Hocko To: "Du, Fan" Cc: "akpm@linux-foundation.org" , "Wu, Fengguang" , "Williams, Dan J" , "Hansen, Dave" , "xishi.qiuxishi@alibaba-inc.com" , "Huang, Ying" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" Subject: Re: [RFC PATCH 5/5] mm, page_alloc: Introduce ZONELIST_FALLBACK_SAME_TYPE fallback list Message-ID: <20190425084302.GQ12751@dhcp22.suse.cz> References: <1556155295-77723-1-git-send-email-fan.du@intel.com> <1556155295-77723-6-git-send-email-fan.du@intel.com> <20190425063807.GK12751@dhcp22.suse.cz> <5A90DA2E42F8AE43BC4A093BF067884825785F04@SHSMSX104.ccr.corp.intel.com> <20190425074841.GN12751@dhcp22.suse.cz> <5A90DA2E42F8AE43BC4A093BF067884825785F50@SHSMSX104.ccr.corp.intel.com> <20190425080936.GP12751@dhcp22.suse.cz> <5A90DA2E42F8AE43BC4A093BF067884825785FA5@SHSMSX104.ccr.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5A90DA2E42F8AE43BC4A093BF067884825785FA5@SHSMSX104.ccr.corp.intel.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 Thu 25-04-19 08:20:28, Du, Fan wrote: > > > >-----Original Message----- > >From: owner-linux-mm@kvack.org [mailto:owner-linux-mm@kvack.org] On > >Behalf Of Michal Hocko > >Sent: Thursday, April 25, 2019 4:10 PM > >To: Du, Fan > >Cc: akpm@linux-foundation.org; Wu, Fengguang ; > >Williams, Dan J ; Hansen, Dave > >; xishi.qiuxishi@alibaba-inc.com; Huang, Ying > >; linux-mm@kvack.org; linux-kernel@vger.kernel.org > >Subject: Re: [RFC PATCH 5/5] mm, page_alloc: Introduce > >ZONELIST_FALLBACK_SAME_TYPE fallback list > > > >On Thu 25-04-19 07:55:58, Du, Fan wrote: > >> >> PMEM is good for frequently read accessed page, e.g. page cache(implicit > >> >> page > >> >> request), or user space data base (explicit page request) > >> >> For now this patch create GFP_SAME_NODE_TYPE for such cases, > >additional > >> >> Implementation will be followed up. > >> > > >> >Then simply configure that NUMA node as movable and you get these > >> >allocations for any movable allocation. I am not really convinced a new > >> >gfp flag is really justified. > >> > >> Case 1: frequently write and/or read accessed page deserved to DRAM > > > >NUMA balancing > > Sorry, I mean page cache case here. > Numa balancing works for pages mapped in pagetable style. I would still expect that a remote PMEM node access latency is smaller/comparable to the real storage so a promoting part is not that important for the unmapped pagecache. Maybe I am wrong here but that really begs for some experiments before we start adding special casing. -- Michal Hocko SUSE Labs