linux-kernel - Re: [PATCH 1/6] power: hibernate: Use separate messages for "Syncing filesystems"

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Message-ID: <1433805804.2730.22.camel@perches.com>
Date:	Mon, 08 Jun 2015 16:23:24 -0700
From:	Joe Perches <joe@...ches.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	linux-pm@...r.kernel.org, Len Brown <len.brown@...el.com>,
	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] power: hibernate: Use separate messages for
 "Syncing filesystems"

On Tue, 2015-06-09 at 01:35 +0200, Rafael J. Wysocki wrote:
> On Thursday, June 04, 2015 11:36:44 AM Joe Perches wrote:
> > Add the ability to see how long it takes to sync the filesystems
> > via the printk time mechanism.
> > 
> > Start to standardize the printk "PM: doing something...done"
> > messages on two separate lines.
> 
> Well, it would be good to say what problem this is attempting to fix.
> 
> And while I understand the underlying concern, there is a merit in keeping
> each of these messages in one line (if everything goes well), so I'm wondering
> what about printing each of them in one go after the operation with a tail
> depending on the result?  Like
> 
> printk(KERN_INFO "PM: Syncing filesystems ... done\n");
> 
> on success or
> 
> printk(KERN_INFO "PM: Syncing filesystems ... failed\n");
> 
> on failure?

Maybe.

I believe there are multi-second delays possible when
syncing the filesystems on things like usb memory sticks.

I think the dmesg line count here isn't particularly important
and there's some small value in consistently presenting timing
information via dmesg timestamps when using 2 lines.

There's also some small value in patch 6/6 and the consistent
prefixing of "PM: " on all these messages.


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