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Date:   Fri, 22 Apr 2022 10:50:20 -0700
From:   Davidlohr Bueso <dave@stgolabs.net>
To:     Yang Shi <shy828301@gmail.com>
Cc:     jvgediya@linux.ibm.com, ying.huang@intel.com, weixugc@google.com,
        linux-mm@kvack.org, mhocko@kernel.org, akpm@linux-foundation.org,
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        shakeelb@google.com, dave.hansen@linux.intel.com,
        tim.c.chen@linux.intel.com, roman.gushchin@linux.dev,
        gthelen@google.com, a.manzanares@samsung.com,
        heekwon.p@samsung.com, gim.jongmin@samsung.com,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/6] mm/migration: export demotion_path of a node via
 sysfs
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On Fri, 22 Apr 2022, Yang Shi wrote:

>On Fri, Apr 22, 2022 at 10:31 AM Yang Shi <shy828301@gmail.com> wrote:
>>
>> On Fri, Apr 15, 2022 at 10:39 PM Davidlohr Bueso <dave@stgolabs.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