Re: Subject: [PATCH V7 2/4] mm: frontswap: core code

From: Seth Jennings <sjenning@linux.vnet.ibm.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	jeremy@goop.org, hughd@google.com, ngupta@vflare.org,
	konrad.wilk@oracle.com, JBeulich@novell.com,
	kurt.hackel@oracle.com, npiggin@kernel.dk,
	akpm@linux-foundation.org, riel@redhat.com, hannes@cmpxchg.org,
	matthew@wil.cx, chris.mason@oracle.com, jackdachef@gmail.com,
	cyclonusj@gmail.com
Subject: Re: Subject: [PATCH V7 2/4] mm: frontswap: core code
Date: Thu, 25 Aug 2011 08:29:49 -0500	[thread overview]
Message-ID: <4E564E4D.4030302@linux.vnet.ibm.com> (raw)
In-Reply-To: <20110825150532.a4d282b1.kamezawa.hiroyu@jp.fujitsu.com>

On 08/25/2011 01:05 AM, KAMEZAWA Hiroyuki wrote:
> On Tue, 23 Aug 2011 07:58:15 -0700
> Dan Magenheimer <dan.magenheimer@oracle.com> wrote:
> 
>> From: Dan Magenheimer <dan.magenheimer@oracle.com>
>> Subject: [PATCH V7 2/4] mm: frontswap: core code
>>
>> This second patch of four in this frontswap series provides the core code
>> for frontswap that interfaces between the hooks in the swap subsystem and
>> a frontswap backend via frontswap_ops.
>>
>> Two new files are added: mm/frontswap.c and include/linux/frontswap.h
>>
>> Credits: Frontswap_ops design derived from Jeremy Fitzhardinge
>> design for tmem; sysfs code modelled after mm/ksm.c
>>
>> [v7: rebase to 3.0-rc3]
>> [v7: JBeulich@novell.com: new static inlines resolve to no-ops if not config'd]
>> [v7: JBeulich@novell.com: avoid redundant shifts/divides for *_bit lib calls]
>> [v6: rebase to 3.1-rc1]
>> [v6: lliubbo@gmail.com: fix null pointer deref if vzalloc fails]
>> [v6: konrad.wilk@oracl.com: various checks and code clarifications/comments]
>> [v5: no change from v4]
>> [v4: rebase to 2.6.39]
>> Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com>
>> Reviewed-by: Konrad Wilk <konrad.wilk@oracle.com>
>> Acked-by: Jan Beulich <JBeulich@novell.com>
>> Acked-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
>> Cc: Jeremy Fitzhardinge <jeremy@goop.org>
>> Cc: Hugh Dickins <hughd@google.com>
>> Cc: Johannes Weiner <hannes@cmpxchg.org>
>> Cc: Nitin Gupta <ngupta@vflare.org>
>> Cc: Matthew Wilcox <matthew@wil.cx>
>> Cc: Chris Mason <chris.mason@oracle.com>
>> Cc: Rik Riel <riel@redhat.com>
>> Cc: Andrew Morton <akpm@linux-foundation.org>
>>
<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.

> 
> Thanks,
> -Kame
> 
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