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

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Message-ID: <fggmw4jfozww47c3pbpbad7v5ew3jvvgiqg7ccloz6xl5xd4dy@2nxr5lhhzbcb>
Date: Wed, 14 Feb 2024 18:38:11 +0100
From: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
To: Zi Yan <ziy@...dia.com>
Cc: "\"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

On Wed, Feb 14, 2024 at 12:18:14PM -0500, Zi Yan wrote:
> 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.
> 

Cool! Sounds good to me. I generally base my baseline based on -rcs. So
I might include it while sending for reviews until 6.8. I will remove
that patch once this gets in for the 6.9 merge window.

Thanks.
--
Pankaj