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

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Message-ID: <20150609092009.GA5926@amd>
Date:	Tue, 9 Jun 2015 11:20:09 +0200
From:	Pavel Machek <pavel@....cz>
To:	Joe Perches <joe@...ches.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
	Len Brown <len.brown@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] power: hibernate: Use separate messages for "Syncing
 filesystems"

On Mon 2015-06-08 16:23:24, Joe Perches wrote:
> 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.

Hibernation is little special here, because that's what user actually
sees, and because message interleaving is extremely unlikely there.

Unless you have a real problem with this, just let it be.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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