linux-kernel - Re: [PATCH v4 0/7] Split a folio to any lower order folios

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Date: Wed, 14 Feb 2024 12:18:14 -0500
From: Zi Yan <ziy@...dia.com>
To: "\"Pankaj Raghav (Samsung)\"" <kernel@...kajraghav.com>
Cc: Zi Yan <ziy@...dia.com>,
 "\"Matthew Wilcox (Oracle)\"" <willy@...radead.org>, linux-mm@...ck.org,
 David Hildenbrand <david@...hat.com>, Yang Shi <shy828301@...il.com>,
 Yu Zhao <yuzhao@...gle.com>,
 "\"Kirill A . Shutemov\"" <kirill.shutemov@...ux.intel.com>,
 Ryan Roberts <ryan.roberts@....com>,
 "Michal Koutný" <mkoutny@...e.com>,
 Roman Gushchin <roman.gushchin@...ux.dev>,
 "\"Zach O'Keefe\"" <zokeefe@...gle.com>, Hugh Dickins <hughd@...gle.com>,
 Mcgrof Chamberlain <mcgrof@...nel.org>,
 Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
 cgroups@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 0/7] Split a folio to any lower order folios

Hi Pankaj,

On 13 Feb 2024, at 16:55, Zi Yan wrote:

> From: Zi Yan <ziy@...dia.com>
>
> Hi all,
>
> File folio supports any order and multi-size THP is upstreamed[1], so both
> file and anonymous folios can be >0 order. Currently, split_huge_page()
> only splits a huge page to order-0 pages, but splitting to orders higher than
> 0 is going to better utilize large folios. In addition, Large Block
> Sizes in XFS support would benefit from it[2]. This patchset adds support for

Just talked to Matthew about his order-1 pagecache folio, I am planning to
grab that into this one, so that I can remove the restriction in my patches
and you guys do not need to do that in your patchset. Let me know if it works
for you.

--
Best Regards,
Yan, Zi

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