linux-kernel - Re: [RFC PATCH 0/2] Node migration between memory tiers

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Message-ID: <ZW3zl2Fke5FtQCv3@tiehlicka>
Date:   Mon, 4 Dec 2023 16:43:19 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     sthanneeru.opensrc@...ron.com
Cc:     aneesh.kumar@...ux.ibm.com, linux-cxl@...r.kernel.org,
        linux-mm@...ck.org, dan.j.williams@...el.com, hannes@...xchg.org,
        hasanalmaruf@...com, haowang3@...com, ying.huang@...el.com,
        gregory.price@...verge.com, tj@...nel.org,
        hezhongkun.hzk@...edance.com, fvdl@...gle.com, john@...alactic.com,
        emirakhur@...ron.com, vtavarespetr@...ron.com,
        Ravis.OpenSrc@...ron.com, Jonathan.Cameron@...wei.com,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [RFC PATCH 0/2] Node migration between memory tiers

On Fri 01-12-23 03:34:20, sthanneeru.opensrc@...ron.com wrote:
> From: Srinivasulu Thanneeru <sthanneeru.opensrc@...ron.com>
> 
> 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