linux-kernel - RE: Subject: [PATCH V7 2/4] mm: frontswap: core code

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Message-ID: <75ecaef7-054a-4acd-b1c5-8041ccde3501@default>
Date:	Thu, 25 Aug 2011 10:52:18 -0700 (PDT)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org, jeremy@...p.org,
	hughd@...gle.com, ngupta@...are.org,
	Konrad Wilk <konrad.wilk@...cle.com>, JBeulich@...ell.com,
	Kurt Hackel <kurt.hackel@...cle.com>, npiggin@...nel.dk,
	akpm@...ux-foundation.org, riel@...hat.com, hannes@...xchg.org,
	matthew@....cx, Chris Mason <chris.mason@...cle.com>,
	jackdachef@...il.com, cyclonusj@...il.com
Subject: RE: Subject: [PATCH V7 2/4] mm: frontswap: core code

> From: Seth Jennings [mailto:sjenning@...ux.vnet.ibm.com]
> To: KAMEZAWA Hiroyuki
> 
> On 08/25/2011 01:05 AM, KAMEZAWA Hiroyuki wrote:
> <cut>
> >
> >
> > I'm sorry if I miss codes but.... is an implementation of frontswap.ops included
> > in this patch set ? Or how to test the work ?
> 
> The zcache driver (in drivers/staging/zcache) is the one that registers frontswap ops.
> 
> You can test frontswap by enabling CONFIG_FRONTSWAP and CONFIG_ZCACHE, and putting
> "zcache" in the kernel boot parameters.

Also see Xen tmem (in drivers/xen).  I am also working on a related project
called RAMster that uses frontswap.  And someone has started code for KVM
to work with transcendent memory (including frontswap).  But for now zcache
is the only non-virtualization in-kernel user for frontswap.

Dan

P.S. A recent build fix for zcache is necessary for it to work without
manual modification to the zcache Makefile.
See 8c70aac04e01a08b7eca204312946206d1c1baac in Linus's tree.
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