linux-kernel - Re: [RESEND PATCH v7 00/10] Small-sized THP for anonymous memory

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Date:   Fri, 24 Nov 2023 10:02:10 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Zi Yan <ziy@...dia.com>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Ryan Roberts <ryan.roberts@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yin Fengwei <fengwei.yin@...el.com>,
        Yu Zhao <yuzhao@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Yang Shi <shy828301@...il.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Itaru Kitayama <itaru.kitayama@...il.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        John Hubbard <jhubbard@...dia.com>,
        David Rientjes <rientjes@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Hugh Dickins <hughd@...gle.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v7 00/10] Small-sized THP for anonymous memory

>> So we're really only concerned about:
>> * AnonHugePages
>> * ShmemHugePages
>> * FileHugePages
>>
>> The question is if we really want to continue extending/adjusting the old meminfo interfaces and talk about how to perform accounting there.
>>
>> Because, as we learned, we might get a new file-based sysfs based interface, because Greg seems to be against exposing new values in the old single-file-based one.
> 
> I am not aware of this. And it is interesting. Do you have a pointer?

Sure:

https://lore.kernel.org/all/2023110216-labrador-neurosis-1e6e@gregkh/T/#u

> 
>>
>> In a new one, we have all freedom to expose what we actually want nowadays, and can just document that the old interface was designed with the assumption that there is only a single THP size.
> 
> This sounds like a good strategy and hopefully we could design the new THP interface
> more future proof.

Yes!

-- 
Cheers,

David / dhildenb