linux-kernel - Re: [PATCHv2 5/9] debugfs: add get/set for atomic types

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Message-ID: <50EB32FB.30802@linux.vnet.ibm.com>
Date:	Mon, 07 Jan 2013 14:41:31 -0600
From:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	devel@...verdev.osuosl.org,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>, linux-mm@...ck.org,
	Minchan Kim <minchan@...nel.org>, Mel Gorman <mgorman@...e.de>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>,
	Johannes Weiner <jweiner@...hat.com>,
	Nitin Gupta <ngupta@...are.org>,
	Jenifer Hopper <jhopper@...ibm.com>
Subject: Re: [PATCHv2 5/9] debugfs: add get/set for atomic types

On 01/07/2013 02:32 PM, Greg Kroah-Hartman wrote:
> On Mon, Jan 07, 2013 at 02:24:36PM -0600, Seth Jennings wrote:
>> debugfs currently lack the ability to create attributes
>> that set/get atomic_t values.
> 
> I hate to ask, but why would you ever want to do such a thing?

There are a few atomic_t statistics in zswap that are valuable to have
in the debugfs attributes.  Rather than have non-atomic mirrors of all
of them, as is done in zcache right now (see
drivers/staging/ramster/zcache-main.c:131), I thought this to be a
cleaner solution.

Granted, I personally have no use for the setting part; only the
getting part.  I only included the setting operations to keep the
balance and conform with the rest of the debugfs implementation.

Seth

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