From: "Theodore Ts'o" <tytso@mit.edu>
To: Christoph Hellwig <hch@infradead.org>
Cc: John Garry <john.g.garry@oracle.com>,
Ojaswin Mujoo <ojaswin@linux.ibm.com>,
linux-ext4@vger.kernel.org,
Ritesh Harjani <ritesh.list@gmail.com>,
linux-kernel@vger.kernel.org,
"Darrick J . Wong" <djwong@kernel.org>,
linux-block@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org, dchinner@redhat.com
Subject: Re: [RFC 0/7] ext4: Allocator changes for atomic write support with DIO
Date: Tue, 12 Dec 2023 10:16:13 -0500 [thread overview]
Message-ID: <20231212151613.GA142380@mit.edu> (raw)
In-Reply-To: <ZXhb0tKFvAge/GWf@infradead.org>
On Tue, Dec 12, 2023 at 05:10:42AM -0800, Christoph Hellwig wrote:
> On Tue, Dec 12, 2023 at 07:46:51AM +0000, John Garry wrote:
> > It is assumed that the user will fallocate/dd the complete file before
> > issuing atomic writes, and we will have extent alignment and length as
> > required.
>
> I don't think that's a long time maintainable usage model.
For databases that are trying to use this to significantly improve
their performance by eliminating double writes, the allocation and
writes are being done by a single process. So for *that* use case, it
is quite maintainable.
Cheers,
- Ted
next prev parent reply other threads:[~2023-12-12 15:18 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-30 13:53 [RFC 0/7] ext4: Allocator changes for atomic write support with DIO Ojaswin Mujoo
2023-11-30 13:53 ` [RFC 1/7] iomap: Don't fall back to buffered write if the write is atomic Ojaswin Mujoo
2023-11-30 21:10 ` Dave Chinner
2023-12-01 10:42 ` John Garry
2023-12-01 13:27 ` Matthew Wilcox
2023-12-01 19:06 ` John Garry
2023-12-01 22:07 ` Dave Chinner
2023-12-04 9:02 ` John Garry
2023-12-04 18:17 ` Darrick J. Wong
2023-12-04 18:34 ` John Garry
2023-12-07 12:43 ` John Garry
2023-11-30 13:53 ` [RFC 2/7] ext4: Factor out size and start prediction from ext4_mb_normalize_request() Ojaswin Mujoo
2023-11-30 13:53 ` [RFC 3/7] ext4: add aligned allocation support in mballoc Ojaswin Mujoo
2023-11-30 13:53 ` [RFC 4/7] ext4: allow inode preallocation for aligned alloc Ojaswin Mujoo
2023-11-30 13:53 ` [RFC 5/7] block: export blkdev_atomic_write_valid() and refactor api Ojaswin Mujoo
2023-12-01 10:47 ` John Garry
2023-12-11 10:57 ` Ojaswin Mujoo
2023-11-30 13:53 ` [RFC 6/7] ext4: Add aligned allocation support for atomic direct io Ojaswin Mujoo
2023-11-30 13:53 ` [RFC 7/7] ext4: Support atomic write for statx Ojaswin Mujoo
2023-12-04 10:36 ` [RFC 0/7] ext4: Allocator changes for atomic write support with DIO John Garry
2023-12-04 13:38 ` Ojaswin Mujoo
2023-12-04 14:44 ` John Garry
2023-12-11 10:54 ` Ojaswin Mujoo
2023-12-12 7:46 ` John Garry
2023-12-12 13:10 ` Christoph Hellwig
2023-12-12 15:16 ` Theodore Ts'o [this message]
2023-12-12 15:19 ` Christoph Hellwig
2023-12-12 16:10 ` John Garry
2023-12-13 5:59 ` Ojaswin Mujoo
2023-12-13 9:17 ` John Garry
2023-12-13 6:42 ` Ojaswin Mujoo
2023-12-13 9:20 ` John Garry
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