linux-kernel - Re: [RFC PATCH v2 0/4] Add support for LZ4-compressed kernel

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Date:	Wed, 27 Feb 2013 11:08:53 -0500 (EST)
From:	Nicolas Pitre <nico@...xnic.net>
To:	Joe Perches <joe@...ches.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Peter Korsgaard <jacmet@...site.dk>,
	"Markus F.X.J. Oberhumer" <markus@...rhumer.com>,
	Kyungsik Lee <kyungsik.lee@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Michal Marek <mmarek@...e.cz>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org, x86@...nel.org,
	celinux-dev@...ts.celinuxforum.org,
	Nitin Gupta <nitingupta910@...il.com>,
	Richard Purdie <rpurdie@...nedhand.com>,
	Josh Triplett <josh@...htriplett.org>,
	Joe Millenbach <jmillenbach@...il.com>,
	David Sterba <dsterba@...e.cz>,
	Richard Cochran <richardcochran@...il.com>,
	Albin Tonnerre <albin.tonnerre@...e-electrons.com>,
	Egon Alter <egon.alter@....net>, hyojun.im@....com,
	chan.jeong@....com, raphael.andy.lee@...il.com
Subject: Re: [RFC PATCH v2 0/4] Add support for LZ4-compressed kernel

On Wed, 27 Feb 2013, Joe Perches wrote:

> https://lkml.org/lkml/2013/1/29/145

Connecting to lkml.org (lkml.org)|87.253.128.182|:443... connected.
HTTP request sent, awaiting response... 500 Server Error

> I did not and do not see significant value in
> adding LZ4 given Markus' LZO improvements.

Please someone post a comprehensive comparison with all the results in 
the same email.

> The new LZO code is faster than ever and it's
> a standalone improvement.
> 
> Why would the LZO code not be updated?

It is used by filesystems, etc.  So of course it needs to be updated to 
faster code.

> Markus has posted what seems a clean git pull
> request.  It was not cc'd to arm or linux-arch.
> 
> http://linux-kernel.2935.n7.nabble.com/GIT-PULL-Update-LZO-compression-code-for-v3-9-td605184.html

Maybe a reminder should be sent to Linus about this.

>From the above we can see this:

   **LZO-2013-UA : updated LZO version available in linux-next plus 
   experimental ARM Unaligned Access patch. This needs approval from 
   some ARM maintainer ist NOT YET INCLUDED.

What is that experimental patch in need of approval?


Nicolas
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