linux-kernel - Re: [LSF/MM/BPF TOPIC] untorn buffered writes

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Message-ID: <ZlW4o4O9saBw5Xjr@infradead.org>
Date: Tue, 28 May 2024 03:57:39 -0700
From: Christoph Hellwig <hch@...radead.org>
To: John Garry <john.g.garry@...cle.com>
Cc: Christoph Hellwig <hch@...radead.org>, Theodore Ts'o <tytso@....edu>,
	lsf-pc@...ts.linux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-mm <linux-mm@...ck.org>, Luis Chamberlain <mcgrof@...nel.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Matthew Wilcox <willy@...radead.org>,
	Dave Chinner <david@...morbit.com>, linux-kernel@...r.kernel.org
Subject: Re: [LSF/MM/BPF TOPIC] untorn buffered writes

On Tue, May 28, 2024 at 10:21:15AM +0100, John Garry wrote:
> If so, I am not sure if a mmap interface would work for DB usecase, like
> PostgreSQL. I can ask.

Databases really should be using direct I/O for various reasons.  And if
Postgres still isn't doing that we shouldn't work around that in the
kernel.