linux-kernel - RE: [PATCHv5 4/8] zswap: add to mm/

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Date:	Mon, 18 Feb 2013 11:55:50 -0800 (PST)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Ric Mason <ric.masonn@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Minchan Kim <minchan@...nel.org>,
	Konrad Wilk <konrad.wilk@...cle.com>,
	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@...ux.vnet.ibm.com>,
	Joe Perches <joe@...ches.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Subject: RE: [PATCHv5 4/8] zswap: add to mm/

> From: Seth Jennings [mailto:sjenning@...ux.vnet.ibm.com]
> Subject: Re: [PATCHv5 4/8] zswap: add to mm/
> 
> On 02/15/2013 10:04 PM, Ric Mason wrote:
> > On 02/14/2013 02:38 AM, Seth Jennings wrote:
> <snip>
> >> + * The statistics below are not protected from concurrent access for
> >> + * performance reasons so they may not be a 100% accurate.  However,
> >> + * the do provide useful information on roughly how many times a
> >
> > s/the/they
> 
> Ah yes, thanks :)
> 
> >
> >> + * certain event is occurring.
> >> +*/
> >> +static u64 zswap_pool_limit_hit;
> >> +static u64 zswap_reject_compress_poor;
> >> +static u64 zswap_reject_zsmalloc_fail;
> >> +static u64 zswap_reject_kmemcache_fail;
> >> +static u64 zswap_duplicate_entry;
> >> +
> >> +/*********************************
> >> +* tunables
> >> +**********************************/
> >> +/* Enable/disable zswap (disabled by default, fixed at boot for
> >> now) */
> >> +static bool zswap_enabled;
> >> +module_param_named(enabled, zswap_enabled, bool, 0);
> >
> > please document in Documentation/kernel-parameters.txt.
> 
> Will do.

Is that a good idea?  Konrad's frontswap/cleancache patches
to fix frontswap/cleancache initialization so that backends
can be built/loaded as modules may be merged for 3.9.
AFAIK, module parameters are not included in kernel-parameters.txt.

Dan
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