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h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=YOaNcpQ6My2bUhBcS70FOu0bLg5v5vZHCTRkgHEbbYM=; b=tj/UJeCdsMGyPWGdKIizicxYxzBgTyG1loqLjwj9GNYY5CVkpbGvV79Sugd3/xJZYqnx5P 0cM9dGOVT7TG1MmP/dBn/0UEwDd59VfveUq3avVaAKDudbopYSwMw26Rfmg6R/plnXcaey 8vK4WDl22XY+fI2mSXzqxXBlvrw21Ps= Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 64AAF139AA; Mon, 4 Dec 2023 15:43:20 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id VZXlFZjzbWU9WgAAD6G6ig (envelope-from ); Mon, 04 Dec 2023 15:43:20 +0000 Date: Mon, 4 Dec 2023 16:43:19 +0100 From: Michal Hocko To: sthanneeru.opensrc@micron.com Cc: aneesh.kumar@linux.ibm.com, linux-cxl@vger.kernel.org, linux-mm@kvack.org, dan.j.williams@intel.com, hannes@cmpxchg.org, hasanalmaruf@fb.com, haowang3@fb.com, ying.huang@intel.com, gregory.price@memverge.com, tj@kernel.org, hezhongkun.hzk@bytedance.com, fvdl@google.com, john@jagalactic.com, emirakhur@micron.com, vtavarespetr@micron.com, Ravis.OpenSrc@micron.com, Jonathan.Cameron@huawei.com, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org Subject: Re: [RFC PATCH 0/2] Node migration between memory tiers Message-ID: References: <20231130220422.2033-1-sthanneeru.opensrc@micron.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20231130220422.2033-1-sthanneeru.opensrc@micron.com> X-Stat-Signature: w3mazfn14h4o14ktt9ff7s6hupngjx61 X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 4702DA0019 X-Rspam-User: X-HE-Tag: 1701704601-906592 X-HE-Meta: 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 vy1WxKns DTpTxSN2ZcC1IapsNkw8JjL35r0f/PaVZdRLsrvOr263K0ikaF/1ji1XsWWrc8t8u1rORHLqnzAVSmNj37CdN+eWrnspA32oN/aKo5hO/KIK+gUJaPDHLGmuZtUVBcxDLw3TCIUZZYYY8N731mws0YbzkO6ohNL3BQN2KcnFELMLzIX0d2GYRleuFHx8siiA7aQ6FWEakX/81GBQ2Eef6+tIjkLPC4BaHO5EjzQzIdSd0NdtfEP8DtvBbVoSfDofShZ7jiPMSyPMU8dpIit5A5BqChQ== 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: List-Subscribe: List-Unsubscribe: On Fri 01-12-23 03:34:20, sthanneeru.opensrc@micron.com wrote: > From: Srinivasulu Thanneeru > > The memory tiers feature allows nodes with similar memory types > or performance characteristics to be grouped together in a > memory tier. However, there is currently no provision for > moving a node from one tier to another on demand. Could you expand on why this is really needed/necessary? What is the actual usecase? -- Michal Hocko SUSE Labs