From: Goldwyn Rodrigues <rgoldwyn@suse.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: [PATCH 4/9] btrfs: Switch to iomap_dio_rw() for dio
Date: Fri, 27 Mar 2020 11:13:48 -0500 [thread overview]
Message-ID: <20200327161348.to4upflzczkbbpfo@fiona> (raw)
In-Reply-To: <20200327081024.GA24827@infradead.org>
On 1:10 27/03, Christoph Hellwig wrote:
> On Thu, Mar 26, 2020 at 04:02:49PM -0500, Goldwyn Rodrigues wrote:
> > BTRFS direct I/O is now done under i_rwsem, shared in case of
> > reads and exclusive in case of writes. This guards against simultaneous
> > truncates.
>
> Btw, you really want to add the optimization of only taking it shared
> for all the easy write cases similar to what XFS has done for ages
> and what ext4 picked up now. Without that performance on someworkloads
> is going to be horrible. That could be a patch on top of this one,
> though.
Yes, I will work on that. The idea of dropping the lock seems a little
weird.
--
Goldwyn
next prev parent reply other threads:[~2020-03-27 16:13 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-26 21:02 [PATCH 0/9 v7] btrfs direct-io using iomap Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 1/9] fs: Export generic_file_buffered_read() Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 2/9] iomap: add a filesystem hook for direct I/O bio submission Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 3/9] iomap: Remove lockdep_assert_held() Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 4/9] btrfs: Switch to iomap_dio_rw() for dio Goldwyn Rodrigues
2020-03-27 8:10 ` Christoph Hellwig
2020-03-27 16:13 ` Goldwyn Rodrigues [this message]
2020-05-07 6:14 ` Christoph Hellwig
2020-05-07 11:37 ` David Sterba
2020-05-07 12:10 ` Christoph Hellwig
2020-05-07 13:44 ` Goldwyn Rodrigues
2020-05-08 3:14 ` Goldwyn Rodrigues
2020-05-09 13:59 ` Christoph Hellwig
2020-05-10 4:06 ` Goldwyn Rodrigues
2020-05-12 14:58 ` Christoph Hellwig
2020-05-12 17:19 ` Goldwyn Rodrigues
2020-05-15 14:13 ` Christoph Hellwig
2020-05-18 14:36 ` Goldwyn Rodrigues
2020-05-19 20:11 ` Goldwyn Rodrigues
2020-05-20 6:11 ` Christoph Hellwig
2020-05-22 11:36 ` David Sterba
2020-05-22 12:08 ` Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 5/9] btrfs: Use ->iomap_end() instead of btrfs_dio_data Goldwyn Rodrigues
2020-03-27 8:16 ` Christoph Hellwig
2020-03-27 16:11 ` Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 6/9] fs: Remove dio_end_io() Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 7/9] btrfs: remove BTRFS_INODE_READDIO_NEED_LOCK Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 8/9] btrfs: btrfs: split btrfs_direct_IO Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 9/9] btrfs: unlock extents in ->iomap_end() for DIO reads Goldwyn Rodrigues
2020-03-27 15:56 ` [PATCH 0/9 v7] btrfs direct-io using iomap David Sterba
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200327161348.to4upflzczkbbpfo@fiona \
--to=rgoldwyn@suse.de \
--cc=hch@infradead.org \
--cc=linux-btrfs@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox