From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 33C261AAE3C; Thu, 20 Jun 2024 11:13:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718882025; cv=none; b=JTYCzJmX3YVAEy+0mx7PThqaclp/jd0mILyAjrhA0LZzpc3w8w+9GUcdXlvPwoofRU8kshUtdq084ZJIX2fFVwZsE03vS+ASiLzWZp3AKIYc/d7QxLCOBcaxR41pR9SgxBctRojZX0lB7HsoLe4mn2/49LbvdPxZAGmMf8woND0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718882025; c=relaxed/simple; bh=+15SEO7s9fPAXDlSVWgRq2WgxDQxLqYWdLWFCT6QWAk=; h=Date:From:To:CC:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=KH1H5Nl9PviTLAGLXYpjWKfF1zhtBZZosYsvOjsyndEv9+F4BfKS3ODF03+SAuGTPhFHAeEIZQAaZccb9C3v+2BTHU4FGp1k5U0HtF6fw+B/Ixd/Wp9YpyaQXgaqaB1Zm0RgTCEAG49NxaxZZUDkgPJTBH/1g2q/epnKOLAYCoE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=Huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=185.176.79.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=Huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.186.231]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4W4dCP59wMz6JBHx; Thu, 20 Jun 2024 19:13:37 +0800 (CST) Received: from lhrpeml500005.china.huawei.com (unknown [7.191.163.240]) by mail.maildlp.com (Postfix) with ESMTPS id D9480140CB1; Thu, 20 Jun 2024 19:13:39 +0800 (CST) Received: from localhost (10.203.174.77) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Thu, 20 Jun 2024 12:13:39 +0100 Date: Thu, 20 Jun 2024 12:13:38 +0100 From: Jonathan Cameron To: Huang Ying CC: Dan Williams , Dave Jiang , , , Alison Schofield , Andrew Morton , Bharata B Rao , Alistair Popple , "Aneesh Kumar K . V" , Davidlohr Bueso , Vishal Verma , Ira Weiny Subject: Re: [PATCH v3 2/3] cxl/region: Support to calculate memory tier abstract distance Message-ID: <20240620121338.0000734f@Huawei.com> In-Reply-To: <20240618084639.1419629-3-ying.huang@intel.com> References: <20240618084639.1419629-1-ying.huang@intel.com> <20240618084639.1419629-3-ying.huang@intel.com> Organization: Huawei Technologies Research and Development (UK) Ltd. X-Mailer: Claws Mail 4.1.0 (GTK 3.24.33; x86_64-w64-mingw32) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: lhrpeml500002.china.huawei.com (7.191.160.78) To lhrpeml500005.china.huawei.com (7.191.163.240) On Tue, 18 Jun 2024 16:46:38 +0800 Huang Ying wrote: > An abstract distance value must be assigned by the driver that makes > the memory available to the system. It reflects relative performance > and is used to place memory nodes backed by CXL regions in the appropriate > memory tiers allowing promotion/demotion within the existing memory tiering > mechanism. > > The abstract distance is calculated based on the memory access latency > and bandwidth of CXL regions. > > Signed-off-by: "Huang, Ying" > Acked-by: Dan Williams LGTM Reviewed-by: Jonathan Cameron