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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2FF16E7849A for ; Mon, 2 Oct 2023 09:21:56 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id AEA1F8D0011; Mon, 2 Oct 2023 05:21:55 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A990E8D0001; Mon, 2 Oct 2023 05:21:55 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 988018D0011; Mon, 2 Oct 2023 05:21:55 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 8A7B48D0001 for ; Mon, 2 Oct 2023 05:21:55 -0400 (EDT) Received: from smtpin02.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 5BC8DB3811 for ; Mon, 2 Oct 2023 09:21:55 +0000 (UTC) X-FDA: 81299979390.02.9739630 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf06.hostedemail.com (Postfix) with ESMTP id 2352A180009 for ; Mon, 2 Oct 2023 09:21:52 +0000 (UTC) Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=Nzewkw8t; spf=pass (imf06.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1696238513; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=9SMs8mHNoKs8/KwUwp2IfY8WHFPaduo12w1Xi37QfxA=; b=ca7D4s9/N7GFXWJIEivcOk5ckak1A1DL35ecfXS2uKt6cfKg9yiXA7anBIhZrAPC3YbHfd +KLwknHxiZYq5ITUwXkd+RvSnkk4Z7QhAjMmnNyQkEHsBXBqrpWomzWptGFWVkS6qfJYMj 2bbtfQUz3xNA8T5QXgel+2IPT9yd3vY= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1696238513; a=rsa-sha256; cv=none; b=wePqdVBCIOqf0zM/ZPAoCHpx5dc7M3OxCujAtjhLbQfOAH3r+vadEvhQk34EwgGoHcj5z5 6wGKbWpXs5Mx++VqVK+90QriI+e5mrrZUTZ06gg6aqZag1rEdL1sOdrpBCR+JYF/2pjTM7 i29/PeVyXvxw0SoZddDaCfLiFOCpZsU= ARC-Authentication-Results: i=1; imf06.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=Nzewkw8t; spf=pass (imf06.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1696238512; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9SMs8mHNoKs8/KwUwp2IfY8WHFPaduo12w1Xi37QfxA=; b=Nzewkw8tBxvNiI7PxExgDkf5fPU2zZoRuRs0fcP6oWR+eNSdIpM2ZpU4+3hCHnkfXwX1o/ 37tJTf7kRsi/2lDMjh2qMhgHewZpVn03hGfPnIKwfFS49dhPuYBZhf0r/o0uDUg32x5waU cMNC2t1NVFcV/DshqAcGmdPoq4XuPCs= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-428-X-5Ov-ewOjStB4mWoC8sQw-1; Mon, 02 Oct 2023 05:21:49 -0400 X-MC-Unique: X-5Ov-ewOjStB4mWoC8sQw-1 Received: by mail-wm1-f70.google.com with SMTP id 5b1f17b1804b1-402cd372b8bso150915735e9.2 for ; Mon, 02 Oct 2023 02:21:48 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696238508; x=1696843308; h=content-transfer-encoding:in-reply-to:organization:from:references :cc:to:content-language:subject:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=9SMs8mHNoKs8/KwUwp2IfY8WHFPaduo12w1Xi37QfxA=; b=NhXnv6Xw8ZF94rTcP7ws+MNu7LJ3oKa0nC2brveoTYTHijKL2vQj+fWFwuhIJ8zwIC pNDL6+SXlgqahMle/Cz2csjBllm+pxXQmwahtpsPenb78R/DxYlTWjJNtfIir+2rIcjh FtaLUKEBLuB4kWfwdLPAyMY3fre5begMLhqW6OOZBW9/3/hD9/E+21UE7O7C2YqxpH3o IAPtPJN7Rbk7xBEDWwM15NjGUfIwQhg+suKh+Cqrzwg0y1L7WMIN97rSjaAXHnhKapmy KSuVn/58eX4QGPLRvK+cBN0P1iqEOwpJiAhw4MgJ6vo3fFl0V2NNGh6S+KGCsXL74FVe VXFA== X-Gm-Message-State: AOJu0YwiJbukJZQs1cRMwMMQbTTLL5Oox61f9htJyAwwMHSX8uZn4QgH k7pp+ydosqyv/UwvU+XSoSl9SXkPZnFpwGtyvn5oCeYmnTiQ38Dmh7VOIz2iXbI2/X/3MqMozM0 FR0Gde+4/JMM= X-Received: by 2002:a1c:f215:0:b0:401:8225:14ee with SMTP id s21-20020a1cf215000000b00401822514eemr9384953wmc.41.1696238508091; Mon, 02 Oct 2023 02:21:48 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGpoIYDU+1jiVcXrF63R4snLKaA9DHdUaPschGkCCIHkpc4jwwbfh1yuXRNn7DbT9sCTvXBqw== X-Received: by 2002:a1c:f215:0:b0:401:8225:14ee with SMTP id s21-20020a1cf215000000b00401822514eemr9384934wmc.41.1696238507655; Mon, 02 Oct 2023 02:21:47 -0700 (PDT) Received: from ?IPV6:2003:cb:c735:f200:cb49:cb8f:88fc:9446? (p200300cbc735f200cb49cb8f88fc9446.dip0.t-ipconnect.de. [2003:cb:c735:f200:cb49:cb8f:88fc:9446]) by smtp.gmail.com with ESMTPSA id p8-20020a7bcc88000000b003fbe4cecc3bsm6791845wma.16.2023.10.02.02.21.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Oct 2023 02:21:47 -0700 (PDT) Message-ID: <0b6f739b-723a-bc53-03a3-f4a793f339b4@redhat.com> Date: Mon, 2 Oct 2023 11:21:46 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.15.1 Subject: Re: [PATCH v4 2/2] dax/kmem: allow kmem to add memory with memmap_on_memory To: Vishal Verma , Andrew Morton , Oscar Salvador , Dan Williams , Dave Jiang Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, Huang Ying , Dave Hansen , "Aneesh Kumar K.V" , Michal Hocko , Jonathan Cameron , Jeff Moyer References: <20230928-vv-kmem_memmap-v4-0-6ff73fec519a@intel.com> <20230928-vv-kmem_memmap-v4-2-6ff73fec519a@intel.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20230928-vv-kmem_memmap-v4-2-6ff73fec519a@intel.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 2352A180009 X-Rspam-User: X-Stat-Signature: 6jr98r893passx69zeecu9pge4kg95pn X-Rspamd-Server: rspam03 X-HE-Tag: 1696238512-161791 X-HE-Meta: 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 N5arFDV/ 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 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 28.09.23 22:30, Vishal Verma wrote: > Large amounts of memory managed by the kmem driver may come in via CXL, > and it is often desirable to have the memmap for this memory on the new > memory itself. > > Enroll kmem-managed memory for memmap_on_memory semantics if the dax > region originates via CXL. For non-CXL dax regions, retain the existing > default behavior of hot adding without memmap_on_memory semantics. > > Add a sysfs override under the dax device to control this behavior and > override either default. > > Cc: Andrew Morton > Cc: David Hildenbrand > Cc: Michal Hocko > Cc: Oscar Salvador > Cc: Dan Williams > Cc: Dave Jiang > Cc: Dave Hansen > Cc: Huang Ying > Reviewed-by: Jonathan Cameron > Signed-off-by: Vishal Verma > --- Reviewed-by: David Hildenbrand -- Cheers, David / dhildenb