linux-kernel - Re: Add simple way to add statistic counters to debugfs

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Message-ID: <20111202191824.GB13613@kroah.com>
Date:	Fri, 2 Dec 2011 11:18:24 -0800
From:	Greg KH <greg@...ah.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	fengguang.wu@...el.com
Subject: Re: Add simple way to add statistic counters to debugfs

On Fri, Dec 02, 2011 at 10:43:24AM -0800, Andi Kleen wrote:
> This extends debugfs to make it very simple to add per cpu counters
> statistics that are exported there. This is useful for all kind
> of debugging situations. The counters have very little overhead
> and are simpler to use than trace points.
> 
> This is the infrastructure for debugfs and a demo application 
> to instrument the dcache RCU which I developed some time ago
> to track down some problems there.
> 
> Posting here also so that Fengguang can use it.
> 
> Module support is still missing, but could be added without too 
> much work.

I like this a lot, very nice job.  I just had one comment with the first
patch.

And yes, I would like module support as well, but others can add that if
they really need it :)

Care to fix up the first patch and I'll be glad to take the two debugfs
patches and any others if you want me to.

thanks,

greg k-h
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