linux-ext4 - Re: [PATCH v4 5/9] Documentation: add a new file documenting multigrain timestamps

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Message-ID: <420ac42f-dad2-4fd9-b36a-6405d14b6e25@infradead.org>
Date: Tue, 9 Jul 2024 16:50:24 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Jeff Layton <jlayton@...nel.org>, Alexander Viro
 <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>,
 Jan Kara <jack@...e.cz>, Steven Rostedt <rostedt@...dmis.org>,
 Masami Hiramatsu <mhiramat@...nel.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Chandan Babu R <chandan.babu@...cle.com>, "Darrick J. Wong"
 <djwong@...nel.org>, Theodore Ts'o <tytso@....edu>,
 Andreas Dilger <adilger.kernel@...ger.ca>, Chris Mason <clm@...com>,
 Josef Bacik <josef@...icpanda.com>, David Sterba <dsterba@...e.com>,
 Hugh Dickins <hughd@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>,
 Jonathan Corbet <corbet@....net>
Cc: Dave Chinner <david@...morbit.com>, Andi Kleen <ak@...ux.intel.com>,
 Christoph Hellwig <hch@...radead.org>, Uros Bizjak <ubizjak@...il.com>,
 Kent Overstreet <kent.overstreet@...ux.dev>, kernel-team@...com,
 linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
 linux-ext4@...r.kernel.org, linux-btrfs@...r.kernel.org, linux-mm@...ck.org,
 linux-nfs@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v4 5/9] Documentation: add a new file documenting
 multigrain timestamps

On 7/8/24 8:53 AM, Jeff Layton wrote:
> Add a high-level document that describes how multigrain timestamps work,
> rationale for them, and some info about implementation and tradeoffs.
> 
> Signed-off-by: Jeff Layton <jlayton@...nel.org>
> ---
>  Documentation/filesystems/multigrain-ts.rst | 120 ++++++++++++++++++++++++++++
>  1 file changed, 120 insertions(+)
> 
> diff --git a/Documentation/filesystems/multigrain-ts.rst b/Documentation/filesystems/multigrain-ts.rst
> new file mode 100644
> index 000000000000..e4f52a9e3c51
> --- /dev/null
> +++ b/Documentation/filesystems/multigrain-ts.rst
> @@ -0,0 +1,120 @@

> +Inode Timestamp Ordering
> +========================
> +
> +In addition just providing info about changes to individual files, file

   In addition to just

> +timestamps also serve an important purpose in applications like "make". These
> +programs measure timestamps in order to determine whether source files might be
> +newer than cached objects.