linux-kernel - Re: [PATCH 16/16] f2fs: update Kconfig and Makefile

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Date:	Sun, 07 Oct 2012 02:58:13 +0900
From:	Jaegeuk Kim <jaegeuk.kim@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	±èÀç±Ø <jaegeuk.kim@...sung.com>,
	viro@...iv.linux.org.uk, 'Theodore Ts'o' <tytso@....edu>,
	linux-kernel@...r.kernel.org, chur.lee@...sung.com,
	cm224.lee@...sung.com, jooyoung.hwang@...sung.com
Subject: Re: [PATCH 16/16] f2fs: update Kconfig and Makefile

2012-10-05 (ê¸ˆ), 09:53 -0700, Greg KH:
> On Fri, Oct 05, 2012 at 09:06:09PM +0900, ê¹€ìž¬ê·¹ wrote:
> > This adds Makefile and Kconfig for f2fs, and updates Makefile and Kconfig files
> > in the fs directory.
> 
> I found it easier to comment about this here, instead of where the code
> implemented this, as you describe it well here:
> 
> > +config F2FS_STAT_FS
> > +	bool "F2FS Status Information"
> > +	depends on F2FS_FS
> > +	default y
> > +	help
> > +	  /proc/fs/f2fs/ contains information about partitions mounted as f2fs.
> > +	  For each partition, a corresponding directory, named as its device
> > +	  name, is provided with the following proc entries.
> > +
> > +	  f2fs_stat	major file system information managed by f2fs currently
> > +	  f2fs_sit_stat	average SIT information about whole segments
> > +	  f2fs_mem_stat	current memory footprint consumed by f2fs
> > +
> > +	  e.g., in /proc/fs/f2fs/sdb1/
> 
> As this is primarily debugging information, why not just always enable
> it, and put in debugfs instead of in procfs?  That's where new debugging
> information should be going.  Side benefit, your code should shrink a
> bit if you use debugfs instead of procfs :)
> 
> Or, if this is really needed by all users, what is wrong with
> /sys/fs/f2fs/ instead?
> 

Thank you for good recommendation. :)
Since this status information is just for showing how fs is working in
run-time, not configuring some kind of parameters in the fs, so I think
proc or debugfs would be one of candidates.

Between them, IMHO, this status information will not be used for
debugging in practical.
Instead, I think the debugging information would include something like
ftrace, locking trace, IO trace, and so on.
So, currently, I just want to show the current fs status by proc simply.
And, of course, in the future, I have to reexamine and rewrite the proc
entry finally.

Thank you,

> thanks,
> 
> greg k-h
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-- 
Jaegeuk Kim
Samsung

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