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 DA801C10F03 for ; Thu, 25 Apr 2019 07:48:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9A673217D7 for ; Thu, 25 Apr 2019 07:48:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9A673217D7 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 494BE6B000C; Thu, 25 Apr 2019 03:48:44 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 441096B000D; Thu, 25 Apr 2019 03:48:44 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 30A0B6B000E; Thu, 25 Apr 2019 03:48:44 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-ed1-f70.google.com (mail-ed1-f70.google.com [209.85.208.70]) by kanga.kvack.org (Postfix) with ESMTP id CF8056B000C for ; Thu, 25 Apr 2019 03:48:43 -0400 (EDT) Received: by mail-ed1-f70.google.com with SMTP id e22so11220522edd.9 for ; Thu, 25 Apr 2019 00:48:43 -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=vlwgYT+kNZGNtlhgcPt6OaoKxXU+/F17Asts9ky7DrU=; b=hdNmDGKhlO5jD6xSfsgm5K/sC79AyoLTBjdj9yCRC3sEbV88lXQVGO/0LTfmsLWnD5 PjwO7UNbUzDZKGadDpd1iC/or20+i+7h0cCcZmhwEuwGlbtOJT9Fr/nnltxB+GKIy22T dlRIDItAz9xBJvJ18yqnk8J6yi+iY158YHuuJmpw1UkEBl+lHfbngvyDbGueOMhiarRP v5Z5s0NzWc/RLZ2ztQfSSXn44jajf6HPoRLpP7jHJBvo2EGoDIPQ8MdX4ATSmjRJUE/J 0E+XMTzX1YoEJrc7LWxlcLaF7hIFhcCDhblP8nX07iQsW2txi/PDtuvmC0XkP1UBAKhA DjeA== 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: APjAAAWV6rTKrKim5LSQv0rcfQsoGWXLnujgp4cg19QkptwiuO+yYMP+ hUY3LOcrAMkh82zJ916lUJEI6FiooSoqgqwfwxeXCac1epd8JZZ7r8vbrgsc7w8g8aCw6ne6VII fxT9XvL7u8mTDwZYPHSkLE/0SWPW+6SZb3UKRkPdFYuZLf/ISNfkqV3+lMd1n3IY= X-Received: by 2002:a17:906:3e91:: with SMTP id a17mr18815289ejj.73.1556178523395; Thu, 25 Apr 2019 00:48:43 -0700 (PDT) X-Google-Smtp-Source: APXvYqzcbCal2/EwsfwLGLG/2uXE7qYo8K5rzLHIx5rmLy2JJJAEoZLrKGlnbKPolkoe4RWrLU/E X-Received: by 2002:a17:906:3e91:: with SMTP id a17mr18815265ejj.73.1556178522668; Thu, 25 Apr 2019 00:48:42 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1556178522; cv=none; d=google.com; s=arc-20160816; b=E5fLXB2CwrL0aaPBInY72xRpXVOx4cohaSEaH0A/CvU6JBrMy1NrPJhNk7K8V9MT2K DuFyV31+i5A5ymU5AW0O27Wn3Wi1M9WQB6pV8zwX074vrewzMMrUlRxiIO7VFeYv/sTv DtcJiSEGN8zIFsu6Zpz5xSKcnAsG6uu2y0SHVQm6z9thgvOAqLVyATD5/IqkzEDGEiIQ ckWrPkIVe54Cazmtrzmhjh+ki63sFiFWE26MkldoelseTG31hSWeBzCvEjqaIkKgAVej sJZqLEHxka5QPWP1uDLVo0vIq4Hqjz3GcuK4itcIjlwo2inGDGi0hMMOmkGSRg2rSO2x 7QbQ== 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=vlwgYT+kNZGNtlhgcPt6OaoKxXU+/F17Asts9ky7DrU=; b=fU0Vc+ay4EEH7FNuiwmOfp6/jdlS+oUal7ud6uWEJ5PjJa3qIlcVhaFCqP9JpHOopK M5YSUmeeLiK2O7GylyVyV1a7tponyjBrpVRlNEm5meRqj3VpzwfXhI/u8ch8mOXIHcN/ 6iUap05GJk8N3HSWDpQMVIEKAaGu3ndByIrDecghr5DGxPaCNp4TeiWmLSNuHfMP1lcI Xs6wgc1DvYgVM+nYLu2fb1y5h9fbQCoHXg+AXmALce4OVbLUaUCQiE8I7uWqU0HlDDnJ wsHrz5SR/I9EfcmKHGPtLozP2ZH/biV4WRIHWPTYJKW3OEGIxxtgT+weO90CVj2lkT3q REYg== 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 g5si1043192eje.144.2019.04.25.00.48.42 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 25 Apr 2019 00:48:42 -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 23A2AAF60; Thu, 25 Apr 2019 07:48:42 +0000 (UTC) Date: Thu, 25 Apr 2019 09:48:41 +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: <20190425074841.GN12751@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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5A90DA2E42F8AE43BC4A093BF067884825785F04@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 07:43:09, Du, Fan wrote: > > > >-----Original Message----- > >From: Michal Hocko [mailto:mhocko@kernel.org] > >Sent: Thursday, April 25, 2019 2:38 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 09:21:35, Fan Du wrote: > >> On system with heterogeneous memory, reasonable fall back lists woul be: > >> a. No fall back, stick to current running node. > >> b. Fall back to other nodes of the same type or different type > >> e.g. DRAM node 0 -> DRAM node 1 -> PMEM node 2 -> PMEM node 3 > >> c. Fall back to other nodes of the same type only. > >> e.g. DRAM node 0 -> DRAM node 1 > >> > >> a. is already in place, previous patch implement b. providing way to > >> satisfy memory request as best effort by default. And this patch of > >> writing build c. to fallback to the same node type when user specify > >> GFP_SAME_NODE_TYPE only. > > > >So an immediate question which should be answered by this changelog. Who > >is going to use the new gfp flag? Why cannot all allocations without an > >explicit numa policy fallback to all existing nodes? > > 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. -- Michal Hocko SUSE Labs