linux-kernel - Re: [PATCH v15 01/10] mm/demotion: Add support for explicit memory tiers

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Message-ID: <c4c37505-0320-2a00-0f8f-0490f39486ff@linux.ibm.com>
Date:   Thu, 18 Aug 2022 19:22:26 +0530
From:   Aneesh Kumar K V <aneesh.kumar@...ux.ibm.com>
To:     linux-mm@...ck.org, akpm@...ux-foundation.org
Cc:     Wei Xu <weixugc@...gle.com>, Huang Ying <ying.huang@...el.com>,
        Yang Shi <shy828301@...il.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Tim C Chen <tim.c.chen@...el.com>,
        Michal Hocko <mhocko@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hesham Almatary <hesham.almatary@...wei.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Alistair Popple <apopple@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Johannes Weiner <hannes@...xchg.org>, jvgediya.oss@...il.com,
        Bharata B Rao <bharata@....com>
Subject: Re: [PATCH v15 01/10] mm/demotion: Add support for explicit memory
 tiers

On 8/18/22 6:40 PM, Aneesh Kumar K.V wrote:

> + */
> +#define MEMTIER_CHUNK_BITS	7
> +#define MEMTIER_CHUNK_SIZE	(1 << MEMTIER_CHUNK_BITS)
> +/*
> + * Smaller abstract distance values imply faster(higher) memory tiers. Offset
> + * the DRAM adistance so that we can accommodate devices with a slightly lower
> + * adistance value (slightly slower) than default DRAM adistance to be part of

                      (^^^ slightly faster)
> + * the same memory tier.
> + */
>