linux-kernel - Re: [RFC PATCH 2/8] mm: Add PG

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Message-ID: <13db54a4-5f02-4b57-8ff9-6298c2c4b8d3@kernel.org>
Date: Thu, 13 Nov 2025 13:34:22 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: Matthew Wilcox <willy@...radead.org>,
 Ojaswin Mujoo <ojaswin@...ux.ibm.com>
Cc: Christian Brauner <brauner@...nel.org>, djwong@...nel.org,
 ritesh.list@...il.com, john.g.garry@...cle.com, tytso@....edu,
 dchinner@...hat.com, hch@....de, linux-xfs@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
 linux-fsdevel@...r.kernel.org, linux-mm@...ck.org, jack@...e.cz,
 nilay@...ux.ibm.com, martin.petersen@...cle.com, rostedt@...dmis.org,
 axboe@...nel.dk, linux-block@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/8] mm: Add PG_atomic

On 12.11.25 16:56, Matthew Wilcox wrote:
> On Wed, Nov 12, 2025 at 04:36:05PM +0530, Ojaswin Mujoo wrote:
>> From: John Garry <john.g.garry@...cle.com>
>>
>> Add page flag PG_atomic, meaning that a folio needs to be written back
>> atomically. This will be used by for handling RWF_ATOMIC buffered IO
>> in upcoming patches.
> 
> Page flags are a precious resource.  I'm not thrilled about allocating one
> to this rather niche usecase.

Fully agreed.

-- 
Cheers

David