linux-kernel - Re: [PATCH 2/2] zram: gather statistics in a unique file

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Date:	Mon, 11 Feb 2013 10:16:27 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Davidlohr Bueso <davidlohr.bueso@...com>
Cc:	linux-kernel@...r.kernel.org, Nitin Gupta <ngupta@...are.org>
Subject: Re: [PATCH 2/2] zram: gather statistics in a unique file

On Mon, Feb 11, 2013 at 10:07:45AM -0800, Davidlohr Bueso wrote:
> On Sun, 2013-02-10 at 21:41 -0800, Greg Kroah-Hartman wrote:
> > On Sun, Feb 10, 2013 at 08:29:06PM -0800, Davidlohr Bueso wrote:
> > > Instead of having one sysfs file per zram statistic, group them all
> > > in a single, reader-friendly, 'statistics' file. This not only reduces
> > > code but is also makes it easier to visualize. The new file looks like:
> > > 
> > > Number of reads:        24
> > > Number of writes:       1055
> > > Invalid IO:             0
> > > Notify free:            0
> > > Zero pages:             1042
> > > Orig data size:         49152 bytes
> > > Compressed data:        838 bytes
> > > Total memory used:      53248 bytes
> > > 
> > > Signed-off-by: Davidlohr Bueso <davidlohr.bueso@...com>
> > 
> > No, please, the rule for sysfs is "one value per file", not files with
> > lots of data that you need to parse.
> 
> Ok.
> 
> > 
> > If you want to do something like this, then do it in debugfs, but NEVER
> > in sysfs.
> 
> So, you would you be open to having the statistics file in debugfs and
> removing the individual files sysfs?

If these are merely debugging information, they should go to debugfs.
If they are something that all users need/want, they should stay in
sysfs as-is.

thanks,

greg k-h
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