linux-kernel - Re: [PATCH V4 4/4] mm: frontswap: config and doc files

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Date:	Tue, 7 Jun 2011 14:03:28 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org, jeremy@...p.org,
	hughd@...gle.com, ngupta@...are.org, JBeulich@...ell.com,
	kurt.hackel@...cle.com, npiggin@...e.de, akpm@...ux-foundation.org,
	riel@...hat.com, hannes@...xchg.org, matthew@....cx,
	chris.mason@...cle.com
Subject: Re: [PATCH V4 4/4] mm: frontswap: config and doc files

On Fri, May 27, 2011 at 12:49:25PM -0700, Dan Magenheimer wrote:
> [PATCH V4 4/4] mm: frontswap: config and doc files
> 
> Add configuration and documentation files.
> 
> Signed-off-by: Dan Magenheimer <dan.magenheimer@...cle.com>
> 
> Diffstat:
>  Documentation/ABI/testing/sysfs-kernel-mm-frontswap |   16 
>  Documentation/vm/frontswap.txt                      |  210 ++++++++++
>  mm/Kconfig                                          |   16 
>  mm/Makefile                                         |    1 
>  4 files changed, 243 insertions(+)
> 
> --- linux-2.6.39/mm/Makefile	2011-05-18 22:06:34.000000000 -0600
> +++ linux-2.6.39-frontswap/mm/Makefile	2011-05-26 15:37:25.262292918 -0600
> @@ -25,6 +25,7 @@ obj-$(CONFIG_HAVE_MEMBLOCK) += memblock.
>  
>  obj-$(CONFIG_BOUNCE)	+= bounce.o
>  obj-$(CONFIG_SWAP)	+= page_io.o swap_state.o swapfile.o thrash.o
> +obj-$(CONFIG_FRONTSWAP)	+= frontswap.o
>  obj-$(CONFIG_HAS_DMA)	+= dmapool.o
>  obj-$(CONFIG_HUGETLBFS)	+= hugetlb.o
>  obj-$(CONFIG_NUMA) 	+= mempolicy.o
> --- linux-2.6.39/mm/Kconfig	2011-05-18 22:06:34.000000000 -0600
> +++ linux-2.6.39-frontswap/mm/Kconfig	2011-05-26 15:39:26.294884780 -0600
> @@ -347,3 +347,19 @@ config NEED_PER_CPU_KM
>  	depends on !SMP
>  	bool
>  	default y
> +
> +config FRONTSWAP
> +	bool "Enable frontswap pseudo-RAM driver to cache swap pages"
> +	default y

default n

> +	help
> + 	  Frontswap is so named because it can be thought of as the opposite of
> + 	  a "backing" store for a swap device.  The storage is assumed to be
> + 	  a synchronous concurrency-safe page-oriented pseudo-RAM device (such
> +	  as Xen's Transcendent Memory, aka "tmem") which is not directly
> +	  accessible or addressable by the kernel and is of unknown (and
> +	  possibly time-varying) size.  When a pseudo-RAM device is available,
> +	  a signficant swap I/O reduction may be achieved.  When none is
> +	  available, all frontswap calls are reduced to a single pointer-
> +	  compare-against-NULL resulting in a negligible performance hit.
> +
> +	  If unsure, say Y to enable frontswap.
> --- linux-2.6.39/Documentation/ABI/testing/sysfs-kernel-mm-frontswap	1969-12-31 17:00:00.000000000 -0700
> +++ linux-2.6.39-frontswap/Documentation/ABI/testing/sysfs-kernel-mm-frontswap	2011-05-26 15:37:25.135819879 -0600
> @@ -0,0 +1,16 @@
> +What:		/sys/kernel/mm/frontswap/
> +Date:		June 2010

Not 2011?
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