linux-kernel - Re: [PATCH 2/2] fs: print a message when freezing/unfreezing filesystems

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Message-ID: <20140515021749.GA3123@thunk.org>
Date:	Wed, 14 May 2014 22:17:49 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Dave Chinner <david@...morbit.com>
Cc:	Mateusz Guzik <mguzik@...hat.com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Josef Bacik <jbacik@...com>,
	Jan Kara <jack@...e.cz>, Al Viro <viro@...IV.linux.org.uk>,
	Eric Sandeen <esandeen@...hat.com>
Subject: Re: [PATCH 2/2] fs: print a message when freezing/unfreezing
 filesystems

On Thu, May 15, 2014 at 07:54:57AM +1000, Dave Chinner wrote:
> On Tue, May 13, 2014 at 08:31:02PM +0200, Mateusz Guzik wrote:
> > This helps hang troubleshooting efforts when only dmesg is available.
> 
> I really don't think that spamming dmesg every time a filesystem is
> frozen or thawed is a good idea. This happens a *lot* when systems
> are using snapshots, and for the most part nobody cares about
> freeze/thaw cycles because they almost always work just fine.

The problems people are worried about are when there is freezing and
unfreezing taking place in combination with a machine-level
suspend/resume cycle, no?  What if we only spammed dmesg when doing a
suspend/resume?

						- Ted
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