linux-kernel - Re: [PATCHv13 0/4] zswap: compressed swap caching

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Date:	Thu, 13 Jun 2013 14:06:17 -0500
From:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
To:	Bob Liu <bob.liu@...cle.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 Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Dan Magenheimer <dan.magenheimer@...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@...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: [PATCHv13 0/4] zswap: compressed swap caching

On Thu, Jun 13, 2013 at 08:34:38PM +0800, Bob Liu wrote:
> Hi Seth,
> 
> On 06/04/2013 04:33 AM, Seth Jennings wrote:
> > This is the latest version of the zswap patchset for compressed swap caching.
> > This is submitted for merging into linux-next and inclusion in v3.11.
> > 
> 
> Have you noticed that pool_pages >> stored_pages, like this:
> [root@...dev32 zswap]# cat *
> 0
> 424057
> 99538
> 0
> 2749448
> 0
> 24
> 60018
> 16837
> [root@...dev32 zswap]# cat pool_pages
> 97372
> [root@...dev32 zswap]# cat stored_pages
> 53701
> [root@...dev32 zswap]#
> 
> I think it's unreasonable to use more pool pages than stored pages!

Gah, in the moving of the zbud metadata for v13, I forgot to init the new
under_reclaim field of the zbud header.  Patch going out now.

Thanks for reporting!

Seth

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