linux-kernel - Re: [PATCH 0/2] Squashfs: add LZ4 compression

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Date:	Mon, 22 Jul 2013 11:05:30 +0800
From:	Gu Zheng <guz.fnst@...fujitsu.com>
To:	Phillip Lougher <phillip@...ashfs.org.uk>
CC:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-embedded@...r.kernel.org
Subject: Re: [PATCH 0/2] Squashfs: add LZ4 compression

Hi Phillip,
	Have some tests been carried out to confirm that Squashfs really 
can get benefit from LZ4 compression, comparing with lzo?

Thanks,
Gu

On 07/22/2013 10:21 AM, Phillip Lougher wrote:

> Hi
> 
> Now that LZ4 compression support is in 3.11-rc1, I have written the
> following two patches for Squashfs to use it.
> 
> Phillip Lougher (2):
>   Squashfs: add LZ4 compression support
>   Squashfs: Add LZ4 compression configuration option
> 
>  Documentation/filesystems/squashfs.txt |    8 +-
>  fs/squashfs/Kconfig                    |   15 +++
>  fs/squashfs/Makefile                   |    1 +
>  fs/squashfs/decompressor.c             |    7 ++
>  fs/squashfs/decompressor.h             |    4 +
>  fs/squashfs/lz4_wrapper.c              |  163 ++++++++++++++++++++++++++++++++
>  fs/squashfs/squashfs_fs.h              |    1 +
>  7 files changed, 195 insertions(+), 4 deletions(-)
>  create mode 100644 fs/squashfs/lz4_wrapper.c
> 
> These patches are also available in the git tree here:
> 
> browse: https://git.kernel.org/cgit/linux/kernel/git/pkl/squashfs-lz4.git
> git clone: git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-lz4.git
> 
> LZ4 support has (obviously) also been added to the squashfs-tools
> (Mksquashfs and Unsquashfs).  This is available from the Squashfs-tools
> git repository here:
> 
> browse: https://git.kernel.org/cgit/fs/squashfs/squashfs-tools.git
> git clone: git://git.kernel.org/pub/scm/fs/squashfs/squashfs-tools.git
> 
> When building the squashfs-tools edit the Makefile to enable LZ4
> support (by default it is disabled).
> 
> LZ4 compression can be specified by using the -comp option, e.g.
> % mksquashfs xxx img.sqsh -comp lz4
> 
> The use of LZ4 high compression can be specified using -Xhc, e.g.
> 
> % mksquashfs xxx img.sqsh -comp lz4 -Xhc
> 
> Phillip
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