From: Jan Kara <jack@suse.cz>
To: Ritesh Harjani <riteshh@linux.ibm.com>
Cc: tytso@mit.edu, jack@suse.cz, linux-ext4@vger.kernel.org,
linux-fsdevel@vger.kernel.org, mbobrowski@mbobrowski.org
Subject: Re: [RFC 0/5] Ext4: Add support for blocksize < pagesize for dioread_nolock
Date: Wed, 6 Nov 2019 18:23:02 +0100 [thread overview]
Message-ID: <20191106172302.GE12685@quack2.suse.cz> (raw)
In-Reply-To: <20191016073711.4141-1-riteshh@linux.ibm.com>
On Wed 16-10-19 13:07:06, Ritesh Harjani wrote:
> This patch series adds the support for blocksize < pagesize for
> dioread_nolock feature.
>
> Since in case of blocksize < pagesize, we can have multiple
> small buffers of page as unwritten extents, we need to
> maintain a vector of these unwritten extents which needs
> the conversion after the IO is complete. Thus, we maintain
> a list of tuple <offset, size> pair (io_end_vec) for this &
> traverse this list to do the unwritten to written conversion.
>
> Appreciate any reviews/comments on this patches.
I know Ted has merged the patches already so this is just informational but
I've read the patches and they look fine to me. Thanks for the work! I was
just thinking that we could actually make the vector tracking more
efficient because the io_end always looks like:
one-big-extent-to-fully-write + whatever it takes to fully write out the
last page
So your vectors could be also expressed as "extent to write" + bitmap of
blocks written in the last page. And 64-bits are enough for the bitmap for
anything ext4 supports so we could easily save allocation of ioend_vec etc.
Just a suggestion.
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2019-11-06 17:23 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-16 7:37 [RFC 0/5] Ext4: Add support for blocksize < pagesize for dioread_nolock Ritesh Harjani
2019-10-16 7:37 ` [RFC 1/5] ext4: keep uniform naming convention for io & io_end variables Ritesh Harjani
2019-10-25 13:07 ` Jan Kara
2019-10-16 7:37 ` [RFC 2/5] ext4: Add API to bring in support for unwritten io_end_vec conversion Ritesh Harjani
2019-10-16 7:37 ` [RFC 3/5] ext4: Refactor mpage_map_and_submit_buffers function Ritesh Harjani
2019-10-16 7:37 ` [RFC 4/5] ext4: Add support for blocksize < pagesize in dioread_nolock Ritesh Harjani
2019-10-16 7:37 ` [RFC 5/5] ext4: Enable blocksize < pagesize for dioread_nolock Ritesh Harjani
2019-10-23 23:26 ` [RFC 0/5] Ext4: Add support for " Theodore Y. Ts'o
2019-10-24 1:12 ` Ritesh Harjani
2019-10-29 7:19 ` Ritesh Harjani
2019-11-03 19:16 ` Theodore Y. Ts'o
2019-11-04 10:16 ` Matthew Bobrowski
2019-11-04 10:37 ` Ritesh Harjani
2019-11-04 10:49 ` Matthew Bobrowski
2019-11-04 16:08 ` Theodore Y. Ts'o
2019-11-04 10:43 ` Ritesh Harjani
2019-11-04 11:59 ` Ritesh Harjani
2019-11-06 17:23 ` Jan Kara [this message]
2019-11-07 11:15 ` Ritesh Harjani
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