linux-kernel - Re: [PATCH 1/3] selftests/mm: make file-backed THP split work by setting force option

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Message-ID: <04002289-c78f-4e1d-b242-144dd53a62f8@redhat.com>
Date: Wed, 22 Jan 2025 15:26:52 +0100
From: David Hildenbrand <david@...hat.com>
To: Zi Yan <ziy@...dia.com>, linux-mm@...ck.org,
 Andrew Morton <akpm@...ux-foundation.org>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc: "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
 "Matthew Wilcox (Oracle)" <willy@...radead.org>,
 Ryan Roberts <ryan.roberts@....com>, Hugh Dickins <hughd@...gle.com>,
 Yang Shi <yang@...amperecomputing.com>, Miaohe Lin <linmiaohe@...wei.com>,
 Kefeng Wang <wangkefeng.wang@...wei.com>, Yu Zhao <yuzhao@...gle.com>,
 John Hubbard <jhubbard@...dia.com>, linux-kselftest@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] selftests/mm: make file-backed THP split work by
 setting force option

On 22.01.25 13:40, Zi Yan wrote:
> Commit acd7ccb284b8 ("mm: shmem: add large folio support for tmpfs")
> changes huge=always to allocate THP/mTHP based on write size and
> split_huge_page_test does not write PMD size data, so file-back THP is not
> created during the test.

Just curious, why can't we write PMD size data instead, to avoid messing 
with the "force" option?

-- 
Cheers,

David / dhildenb