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

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Message-ID: <b12c2e22-f41c-490d-9d74-c85aa397e017@default>
Date:	Thu, 16 May 2013 09:45:43 -0700 (PDT)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	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>,
	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,
	Jonathan Corbet <corbet@....net>
Subject: RE: [PATCHv11 3/4] zswap: add to mm/

> From: Rik van Riel [mailto:riel@...hat.com]
> Sent: Wednesday, May 15, 2013 4:15 PM
> To: Dan Magenheimer
> Cc: Seth Jennings; Andrew Morton; Greg Kroah-Hartman; Nitin Gupta; Minchan Kim; Konrad Wilk; Robert
> Jennings; Jenifer Hopper; Mel Gorman; Johannes Weiner; Larry Woodman; Benjamin Herrenschmidt; Dave
> Hansen; Joe Perches; Joonsoo Kim; Cody P Schafer; Hugh Dickens; Paul Mackerras; linux-mm@...ck.org;
> linux-kernel@...r.kernel.org; devel@...verdev.osuosl.org
> Subject: Re: [PATCHv11 3/4] zswap: add to mm/
> 
> On 05/14/2013 04:18 PM, Dan Magenheimer wrote:
> 
> > It's unfortunate that my proposed topic for LSFMM was pre-empted
> > by the zsmalloc vs zbud discussion and zswap vs zcache, because
> > I think the real challenge of zswap (or zcache) and the value to
> > distros and end users requires us to get this right BEFORE users
> > start filing bugs about performance weirdness.  After which most
> > users and distros will simply default to 0% (i.e. turn zswap off)
> > because zswap unpredictably sometimes sucks.
> 
> I'm not sure we can get it right before people actually start
> using it for real world setups, instead of just running benchmarks
> on it.
> 
> The sooner we get the code out there, where users can play with
> it (even if it is disabled by default and needs a sysfs or
> sysctl config option to enable it), the sooner we will know how
> well it works, and what needs to be changed.

/me sets stage of first Star Wars (1977)

/me envisions self as Obi-Wan Kenobi, old and tired of fighting,
in lightsaber battle with protege Darth Vader / Anakin Skywalker

/me sadly turns off lightsaber, holds useless handle at waist,
takes a deep breath, and promptly gets sliced into oblivion.

Time for A New Hope(tm).

(/me cc's Jon Corbet for a longshot last chance of making LWN's
Kernel Development Quotes of the Week.)
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