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

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Date: Tue, 28 May 2024 12:09:02 +0100
From: John Garry <john.g.garry@...cle.com>
To: Christoph Hellwig <hch@...radead.org>
Cc: 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 28/05/2024 11:57, Christoph Hellwig wrote:
> 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.

As I understand, direct IO support for that DB is a work-in-progress, 
but if and ever it is completed I don't know.

Regardless, my plan is to work towards direct IO kernel support now.