linux-kernel - Re: [PATCH] Add option to disable kernel compression

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Date:	Thu, 11 Apr 2013 09:46:02 +0200
From:	Alexander Stein <alexander.stein@...tec-electronic.com>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	Christian Ruppert <christian.ruppert@...lis.com>,
	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Noam Camus <noamc@...hip.com>,
	pierrick hascoet <pierrick.hascoet@...lis.com>
Subject: Re: [PATCH] Add option to disable kernel compression

Hello,

On Thursday 11 April 2013 13:08:08, Vineet Gupta wrote:
> On 04/09/2013 05:19 PM, Christian Ruppert wrote:
> > Until now, kernel compression can only be disabled by deselecting
> > HAVE_<compression> in the architecture Kconfig. However, some
> > users/platforms within the same architecture might want to use
> > compression while others might want to disable it.
> > This patch is a solution to the dilemma.
> >
> > Signed-off-by: Christian Ruppert <christian.ruppert@...lis.com>
> > ---
> >  init/Kconfig |    8 +++++++-
> >  1 files changed, 7 insertions(+), 1 deletions(-)
> >
> > diff --git a/init/Kconfig b/init/Kconfig
> > index 5341d72..0924c51 100644
> > --- a/init/Kconfig
> > +++ b/init/Kconfig
> > @@ -101,7 +101,6 @@ config HAVE_KERNEL_LZO
> >  choice
> >  	prompt "Kernel compression mode"
> >  	default KERNEL_GZIP
> > -	depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO
> >  	help
> >  	  The linux kernel is a kind of self-extracting executable.
> >  	  Several compression algorithms are available, which differ
> > @@ -120,6 +119,13 @@ choice
> >  
> >  	  If in doubt, select 'gzip'
> >  
> > +config KERNEL_UNCOMPRESSED
> > +	bool "No compression"
> 
> > +	help
> > +	  No compression at all. The kernel is huge but the compression and
> > +	  decompression times are zero.
> > +	  This is usually not what you want.
> > +
> >  config KERNEL_GZIP
> >  	bool "Gzip"
> >  	depends on HAVE_KERNEL_GZIP
> 
> FWIW, this is an issue for ARC port where one of our platforms runs on a very slow
> FPGA, hence doesn't want to spend time uncompressing the image - while others do
> want the gzip.
> 
> Reviewed-by: Vineet Gupta <vgupta@...opsys.com>

Even some other platforms, e.g. ARM you want no compression, if you can effort the additional space, if you want to boot extremely fast.

Best regards,
Alexander

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