linux-kernel - Re: [PATCHv11 3/4] zswap: add to mm/

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Message-ID: <5193EEE7.80603@sr71.net>
Date:	Wed, 15 May 2013 13:24:07 -0700
From:	Dave Hansen <dave@...1.net>
To:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Minchan Kim <minchan@...nel.org>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>,
	Jenifer Hopper <jhopper@...ibm.com>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <jweiner@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Joe Perches <joe@...ches.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Hugh Dickens <hughd@...gle.com>,
	Paul Mackerras <paulus@...ba.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: [PATCHv11 3/4] zswap: add to mm/

On 05/15/2013 01:09 PM, Seth Jennings wrote:
> On Wed, May 15, 2013 at 02:55:06PM -0400, Konrad Rzeszutek Wilk wrote:
>>> Sorry, but I don't think that's appropriate for a patch in the MM subsystem.
>>
>> Perhaps a compromise can be reached where this code is merged as a driver
>> not a core mm component. There is a high bar to be in the MM - it has to
>> work with many many different configurations. 
>>
>> And drivers don't have such a high bar. They just need to work on a specific
>> issue and that is it. If zswap ended up in say, drivers/mm that would make
>> it more palpable I think.

The issue is not whether it is a loadable module or a driver.  Nobody
here is stupid enough to say, "hey, now it's a driver/module, all of the
complex VM interactions are finally fixed!"

If folks don't want this in their system, there's a way to turn it off,
today, with the sysfs tunables.  We don't need _another_ way to turn it
off at runtime (unloading the module/driver).


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