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

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Message-ID: <20130515200942.GA17724@cerebellum>
Date:	Wed, 15 May 2013 15:09:42 -0500
From:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	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>,
	Dave Hansen <dave@...1.net>, 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 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.
> 
> I am heading to the airport shortly so this email is a bit hastily typed.
> 
> 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.
> 
> Thoughts?

zswap, the writeback code particularly, depends on a number of non-exported
kernel symbols, namely:

swapcache_free
__swap_writepage
__add_to_swap_cache
swapcache_prepare
swapper_spaces

So it can't currently be built as a module and I'm not sure what the MM
folks would think about exporting them and making them part of the KABI.

Seth

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