linux-kernel - Re: [PATCH] xfs: Remove i_rwsem lock in buffered read

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Message-ID: <Z4kWf4oCHNd86Hkd@bfoster>
Date: Thu, 16 Jan 2025 09:23:59 -0500
From: Brian Foster <bfoster@...hat.com>
To: Dave Chinner <david@...morbit.com>
Cc: Christoph Hellwig <hch@...radead.org>,
	"Darrick J. Wong" <djwong@...nel.org>,
	Chi Zhiling <chizhiling@....com>,
	Amir Goldstein <amir73il@...il.com>, cem@...nel.org,
	linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Chi Zhiling <chizhiling@...inos.cn>,
	John Garry <john.g.garry@...cle.com>
Subject: Re: [PATCH] xfs: Remove i_rwsem lock in buffered read

On Thu, Jan 16, 2025 at 08:41:21AM +1100, Dave Chinner wrote:
> On Tue, Jan 14, 2025 at 09:55:21PM -0800, Christoph Hellwig wrote:
> > On Mon, Jan 13, 2025 at 08:40:51AM -0500, Brian Foster wrote:
...
> 
> > I don't really have time to turn this hand waving into, but maybe we 
> > should think if it's worthwhile or if I'm missing something important.
> 
> If people are OK with XFS moving to exclusive buffered or DIO
> submission model, then I can find some time to work on the
> converting the IO path locking to use a two-state shared lock in
> preparation for the batched folio stuff that will allow concurrent
> buffered writes...
> 

Ack to this, FWIW. I think this is a natural/logical approach,
prototyping and whatnot notwithstanding.

Brian

> -Dave.
> -- 
> Dave Chinner
> david@...morbit.com
>