linux-kernel - Re: [PATCH RESEND 0/8] hugetlb: add demote/split page functionality

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Message-Id: <20210816162749.22b921a61156a091f3e1d14d@linux-foundation.org>
Date:   Mon, 16 Aug 2021 16:27:49 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        David Hildenbrand <david@...hat.com>,
        Michal Hocko <mhocko@...e.com>,
        Oscar Salvador <osalvador@...e.de>, Zi Yan <ziy@...dia.com>,
        Muchun Song <songmuchun@...edance.com>,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH RESEND 0/8] hugetlb: add demote/split page functionality

Also, pushback...

On Mon, 16 Aug 2021 15:49:45 -0700 Mike Kravetz <mike.kravetz@...cle.com> wrote:

> 
> Real world use cases
> --------------------
> There are groups today using hugetlb pages to back VMs on x86.  Their
> use case is as described above.  They have experienced the issues with
> performance and not necessarily getting the excepted number smaller huge

("number of")

> pages after free/allocate cycle.
> 

It really is a ton of new code.  I think we're owed much more detail
about the problem than the above.  To be confident that all this
material is truly justified?

Also, some selftests and benchmarking code in tools/testing/selftests
would be helpful?