linux-kernel - Re: [PATCH] fix up perfmon to build on -mm

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Message-ID: <20071107170734.GA8358@kroah.com>
Date:	Wed, 7 Nov 2007 09:07:34 -0800
From:	Greg KH <greg@...ah.com>
To:	Stephane Eranian <eranian@....hp.com>
Cc:	Andrew Morton <akpm@...l.org>, perfmon@...ali.hpl.hp.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix up perfmon to build on -mm

On Wed, Nov 07, 2007 at 02:34:49AM -0800, Stephane Eranian wrote:
> Greg,
> 
> On Tue, Nov 06, 2007 at 04:34:54PM -0800, Greg KH wrote:
> > Here's a patch against my current tree that gets the perfmon code
> > building and hopefully working.
> > 
> Thanks for your quick help.
> 
> > Note, it needs the kobject_create_and_register() patch which is in my
> > tree, but I do not think it made it to -mm yet.  The next -mm cycle
> > should have it.
> > 
> > Also, the sysfs usage in the perfmon code is quite strange and not
> > documented at all.  Yes, there is a little bit in the documentation
> > about what a few of the files do, but there are _way_ more files and
> > even directories being created under /sys/kernel/perfmon/ that are not
> > documented at all here.
> > 
> The full documentation for /sys/kernel/perfmon is in Documentation/perfmon2.txt

That is what I was referring to, that file does not describe all of the
sysfs files in /sys/kernel/perfmon by far.

> > If you document this stuff, I think I can clean up your sysfs code a
> > lot, making things simpler, easier to extend, and easier to understand.
> > But as it is, I don't want to break anything as it's totally unknown how
> > this stuff is supposed to work...
> > 
> I certainly welcome your help.
> 
> > Hint, use the Documentation/ABI directory to document your sysfs
> > interfaces, that is what it is there for...
> > 
> I will move the description from perfmon2.txt to its own file in
> ABI/testing.

That would be great to have, thanks.

greg k-h
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