linux-kernel - Re: [PATCH 5/6] mm/migration: export demotion

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Message-ID: <20220422175020.lm2xqbg7lm2tr25r@offworld>
Date:   Fri, 22 Apr 2022 10:50:20 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Yang Shi <shy828301@...il.com>
Cc:     jvgediya@...ux.ibm.com, ying.huang@...el.com, weixugc@...gle.com,
        linux-mm@...ck.org, mhocko@...nel.org, akpm@...ux-foundation.org,
        rientjes@...gle.com, yosryahmed@...gle.com, hannes@...xchg.org,
        shakeelb@...gle.com, dave.hansen@...ux.intel.com,
        tim.c.chen@...ux.intel.com, roman.gushchin@...ux.dev,
        gthelen@...gle.com, a.manzanares@...sung.com,
        heekwon.p@...sung.com, gim.jongmin@...sung.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] mm/migration: export demotion_path of a node via
 sysfs

On Fri, 22 Apr 2022, Yang Shi wrote:

>On Fri, Apr 22, 2022 at 10:31 AM Yang Shi <shy828301@...il.com> wrote:
>>
>> On Fri, Apr 15, 2022 at 10:39 PM Davidlohr Bueso <dave@...olabs.net> wrote:
>> >
>> > Add a /sys/devices/system/node/nodeX/demotion_path file
>> > to export the possible target(s) in node_demotion[node].
>>
>> I'm not sure if you noticed that Jagdish Gediya is working on the
>> similar patch, please see
>> https://lore.kernel.org/linux-mm/20220413092206.73974-1-jvgediya@linux.ibm.com/
>
>Loop in Jagdish Gediya, Ying Huang and Wei Xu.
>

Hmm I had missed this thread, I'll go have a look.

>>
>> It would be better to combine the two to avoid duplicate effort.

Indeed - and even more reason for lsfmm discussions defining the
future ABI for tiering.

Thanks,
Davidlohr