linux-kernel - Re: [PATCH v3] Decompressors: Add boot-time XZ support

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Message-ID: <4D02A275.1060308@pavlinux.ru>
Date:	Sat, 11 Dec 2010 00:58:13 +0300
From:	Pavel Vasilyev <pavel@...linux.ru>
To:	Lasse Collin <lasse.collin@...aani.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] Decompressors: Add boot-time XZ support

On 10.12.2010 21:50, Lasse Collin wrote:
> From: Lasse Collin <lasse.collin@...aani.org>
[--- ням ---]
>  
> +config KERNEL_XZ
> +	bool "XZ"
> +	depends on HAVE_KERNEL_XZ
> +	help
> +	  XZ uses the LZMA2 algorithm and instruction set specific
> +	  BCJ filters which can improve compression ratio of executable
> +	  code. The size of the kernel is about 30% smaller with XZ in
> +	  comparison to gzip. On architectures for which there is a BCJ
> +	  filter (i386, x86_64, ARM, IA-64, PowerPC, and SPARC), XZ
> +	  will create a few percent smaller kernel than plain LZMA.
> +
> +	  The speed is about the same as with LZMA: The decompression
> +	  speed of XZ is better than that of bzip2 but worse than gzip
> +	  and LZO. Compression is slow.
> +
>  config KERNEL_LZO
>  	bool "LZO"
>  	depends on HAVE_KERNEL_LZO

Not worked without this:

--- кусь ---

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index e330da2..d27a9c7 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -52,6 +52,7 @@ config X86
        select HAVE_KERNEL_BZIP2
        select HAVE_KERNEL_LZMA
        select HAVE_KERNEL_LZO
+       select HAVE_KERNEL_XZ
        select HAVE_HW_BREAKPOINT
        select HAVE_MIXED_BREAKPOINTS_REGS
        select PERF_EVENTS

--- кусь ---

.... and for other archs needed.
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