linux-kernel - Re: [PATCH v3 -next 0/5] Add support for LZ4-compressed kernel

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Date:	Wed, 6 Mar 2013 15:15:05 +0900
From:	Kyungsik Lee <kyungsik.lee@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Russell King <linux@....linux.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org, x86@...nel.org,
	celinux-dev@...ts.celinuxforum.org,
	Nicolas Pitre <nico@...xnic.net>,
	David Sterba <dsterba@...e.cz>,
	Nitin Gupta <nitingupta910@...il.com>,
	Joe Millenbach <jmillenbach@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michal Marek <mmarek@...e.cz>, hyojun.im@....com,
	chan.jeong@....com, raphael.andy.lee@...il.com
Subject: Re: [PATCH v3 -next 0/5] Add support for LZ4-compressed kernel

On Tue, Mar 05, 2013 at 03:06:16PM -0800, Andrew Morton wrote:
> On Tue,  5 Mar 2013 20:47:31 +0900 Kyungsik Lee <kyungsik.lee@....com> wrote:
> 
> > This is the third version. In this version, Some codes are fixed
> > and more description and note are added. I would like to thank David Sterba
> > for his review.
> > 
> > The Last patch[5/5] of the patch set is for making x86 and arm default to
> > LZ4-compressed for testing the LZ4 code in the linux-next.
> > It was requested by Andrew Morton in the patch set v2.
> > 
> > Currently, A preliminary version of LZ4 de/compression tool is supported.
> > However, It is expected that we will have a tool with more features
> > once its format is finished.
> 
> What happened to the changelog?  The earlier version at least had some
> rudimentary benchmarking results, but now we don't even have that. 
> 
> Someone should prepare the information explaining why we added this to
> Linux, and I'd prefer that person be you rather than me!  Certainly it
> should include performance measurements - both speed and space.  Also
> it should capture our thinking regarding all the other decompressors,
> explaining why we view it as acceptable to add yet another one.
Sorry, It will have all the information you mentioned. I can reply to
this thread if you want.

Or I might need another patch(v4). I have one thing to be confirmed
regarding LZ4 format. One of the patch set needs to be fixed
if there is a change. After that I can include the information
in the changelog.

> Please, put yourself in the position of someone reading these commits
> in 2017 wondering "why did they merge this".  We should tell them.

Thanks,
Kyungsik
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