linux-kernel - Re: [PATCH v8 07/11] Documentation: add a new file documenting multigrain timestamps

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Message-ID: <135fb33cc23ba1ff07045637916e44f6d6614851.camel@kernel.org>
Date: Thu, 19 Sep 2024 18:53:08 +0200
From: Jeff Layton <jlayton@...nel.org>
To: Bagas Sanjaya <bagasdotme@...il.com>, John Stultz <jstultz@...gle.com>, 
 Thomas Gleixner <tglx@...utronix.de>, Stephen Boyd <sboyd@...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>, Jonathan Corbet
 <corbet@....net>, 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>, Chuck Lever
 <chuck.lever@...cle.com>, Vadim Fedorenko <vadim.fedorenko@...ux.dev>
Cc: Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org, 
 linux-fsdevel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, 
 linux-doc@...r.kernel.org, linux-xfs@...r.kernel.org,
 linux-ext4@...r.kernel.org,  linux-btrfs@...r.kernel.org,
 linux-nfs@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v8 07/11] Documentation: add a new file documenting
 multigrain timestamps

On Mon, 2024-09-16 at 08:01 +0700, Bagas Sanjaya wrote:
> On Sat, Sep 14, 2024 at 01:07:20PM -0400, Jeff Layton wrote:
> > +Multigrain timestamps aim to remedy this by selectively using fine-grained
> > +timestamps when a file has had its timestamps queried recently, and the current
> > +coarse-grained time does not cause a change.
> 
> Do you mean using fine-grained timestamps when timestamps of a file has been
> recently queried/modified BUT its coarse-grained timestamps aren't changed?
> 
> Confused...
> 

Yes, I'll do an s/and/but/ there in the Documentation. Basically, we
want to avoid updating the floor whenever we can (since it's a global
variable), so we only get a fine-grained time if there is no other way
to effect a change to the timestamps.

Thanks!
-- 
Jeff Layton <jlayton@...nel.org>