linux-kernel - Re: [PATCH RESEND 0/4] memory tiering: calculate abstract distance based on ACPI HMAT

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Message-ID: <6c8ed42d-ea71-c11e-2689-c4fc23845ccf@amd.com>
Date:   Tue, 1 Aug 2023 08:05:00 +0530
From:   Bharata B Rao <bharata@....com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Alistair Popple <apopple@...dia.com>
Cc:     Huang Ying <ying.huang@...el.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org,
        nvdimm@...ts.linux.dev, linux-acpi@...r.kernel.org,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Wei Xu <weixugc@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Michal Hocko <mhocko@...nel.org>,
        Yang Shi <shy828301@...il.com>,
        Rafael J Wysocki <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH RESEND 0/4] memory tiering: calculate abstract distance
 based on ACPI HMAT

On 24-Jul-23 11:28 PM, Andrew Morton wrote:
> On Fri, 21 Jul 2023 14:15:31 +1000 Alistair Popple <apopple@...dia.com> wrote:
> 
>> Thanks for this Huang, I had been hoping to take a look at it this week
>> but have run out of time. I'm keen to do some testing with it as well.
> 
> Thanks.  I'll queue this in mm-unstable for some testing.  Detailed
> review and testing would be appreciated.

I gave this series a try on a 2P system with 2 CXL cards. I don't trust the
bandwidth and latency numbers reported by HMAT here, but FWIW, this patchset
puts the CXL nodes on a lower tier than DRAM nodes.

Regards,
Bharata.