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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; 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Mon, 04 Dec 2023 07:43:30 -0800 (PST) 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