linux-ext4 - Re: [PATCH 01/11] ext4: add handling for extended mount options

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Date:   Mon, 22 Jul 2019 17:02:35 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Andreas Dilger <adilger@...ger.ca>
Cc:     Harshad Shirwadkar <harshadshirwadkar@...il.com>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 01/11] ext4: add handling for extended mount options

On Mon, Jul 22, 2019 at 12:15:11PM -0600, Andreas Dilger wrote:
> Unless I missed it, this patch series needs a 00/11 email that describes
> *what* "fast commit" is, and why we want it.  This should include some
> benchmark results, since (I'd assume) that the "fast" part of the feature
> name implies a performance improvement?

For background, it's a simplified version of the scheme proposed by
Park and Shin, in their paper, "iJournaling: Fine-Grained Journaling
for Improving the Latency of Fsync System Call"[1]

[1] https://www.usenix.org/conference/atc17/technical-sessions/presentation/park

I agree we should have a cover letter for this patch series.  Also, we
should add documentation to Documentation/filesystems/journaling.rst
about this feature; what it does, how it works, its basic on-disk
format changes, etc.

The fs/jbd2 layer isn't as well documented as the fs/ext4 code, and
bringing Documentation/filesystems/journaling.rst to the same level as
Documentation/filesystems/ext4/* isn't a fair/reasonable request.  On
the other hand, documenting what is being added by this patch series
is something that I think we should do.

   	     	    	     	    - Ted