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[78.0.206.107]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7bd6683aa8asm44078807b3.26.2026.05.03.20.56.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 03 May 2026 20:57:01 -0700 (PDT) Message-ID: Date: Sun, 3 May 2026 21:57:33 -0600 Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 03/14] mm/huge_memory: remove READ_ONLY_THP_FOR_FS from file_thp_enabled() To: Zi Yan , Andrew Morton , David Hildenbrand , "Matthew Wilcox (Oracle)" , Song Liu Cc: Chris Mason , David Sterba , Alexander Viro , Christian Brauner , Jan Kara , Lorenzo Stoakes , Baolin Wang , "Liam R. Howlett" , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org References: <20260429152924.727124-1-ziy@nvidia.com> <20260429152924.727124-4-ziy@nvidia.com> Content-Language: en-US From: Nico Pache In-Reply-To: <20260429152924.727124-4-ziy@nvidia.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 4/29/26 9:29 AM, Zi Yan wrote: > Replace it with a check on the max folio order of the file's address space > mapping, making sure PMD folio is supported. Keep the inode open-for-write > check, since even if collapse_file() now makes sure all to-be-collapsed > folios are clean and the created PMD file THP can be handled by FSes > properly, the filemap_flush() could perform undesirable write back. > > Signed-off-by: Zi Yan > --- > mm/huge_memory.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index 2f3fcb4dd1ef8..3b324f03e9283 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -86,9 +86,6 @@ static inline bool file_thp_enabled(struct vm_area_struct *vma) > { > struct inode *inode; > > - if (!IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS)) > - return false; > - > if (!vma->vm_file) > return false; > > @@ -97,6 +94,9 @@ static inline bool file_thp_enabled(struct vm_area_struct *vma) > if (IS_ANON_FILE(inode)) > return false; > > + if (!mapping_pmd_folio_support(vma->vm_file->f_mapping)) Other than my question in the previous patch about >= PMD_ORDER vs == PMD_ORDER. LGTM Reviewed-by: Nico Pache > + return false; > + > return !inode_is_open_for_write(inode) && S_ISREG(inode->i_mode); > } >