linux-kernel - Re: [PATCH v8 3/7] init: add support for zstd compressed kernel

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Message-ID: <20200724121716.GB632343@gmail.com>
Date:   Fri, 24 Jul 2020 14:17:16 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Nick Terrell <nickrterrell@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, Chris Mason <clm@...com>,
        linux-kbuild@...r.kernel.org, x86@...nel.org,
        gregkh@...uxfoundation.org, Petr Malat <oss@...at.biz>,
        Kees Cook <keescook@...omium.org>,
        Kernel Team <Kernel-team@...com>,
        Adam Borowski <kilobyte@...band.pl>,
        Patrick Williams <patrickw3@...com>, rmikey@...com,
        Patrick Williams <patrick@...cx.xyz>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Norbert Lange <nolange79@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alex Xu <alex_y_xu@...oo.ca>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Nick Terrell <terrelln@...com>
Subject: Re: [PATCH v8 3/7] init: add support for zstd compressed kernel


* Randy Dunlap <rdunlap@...radead.org> wrote:

> On 7/23/20 12:27 PM, Nick Terrell wrote:
> > +config KERNEL_ZSTD
> > +	bool "ZSTD"
> > +	depends on HAVE_KERNEL_ZSTD
> > +	help
> > +	  ZSTD is a compression algorithm targeting intermediate compression
> > +	  with fast decompression speed. It will compress better than GZIP and
> > +	  decompress around the same speed as LZO, but slower than LZ4. You
> > +	  will need at least 192 KB RAM or more for booting. The zstd command
> > +	  line tools is required for compression.
> 
> 	       tools are required

Since 'zstd' is the singular tool required for compression AFAICS:

   LZ4            = lz4c
   XZ             = xz
  +ZSTD           = zstd

"The zstd command line tool is required for compression" is the 
intended wording I'd say?

Thanks,

	Ingo