linux-kernel - Re: [RESEND PATCH v2 0/2] Add support for ZSTD-compressed kernel

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Message-ID: <20180817192244.GF12066@tassilo.jf.intel.com>
Date:   Fri, 17 Aug 2018 12:22:44 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Adam Borowski <kilobyte@...band.pl>
Cc:     René Rebe <rene@...ctcode.com>,
        Nick Terrell <terrelln@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        Kernel Team <Kernel-team@...com>, Chris Mason <clm@...com>,
        Julian Andres Klode <julian.klode@...onical.com>
Subject: Re: [RESEND PATCH v2 0/2] Add support for ZSTD-compressed kernel

On Fri, Aug 17, 2018 at 07:57:46PM +0200, Adam Borowski wrote:
> > The "favourite compressor" seems to roughly change every year, so if
> > we keep adding new ones things will get more and more convoluted.
> 
> The above patchset drops just bzip2.  It is the only one that's strictly
> beaten in every way (ratio, time, memory usage), there are also no other

Does time include build time? I've been reverting back to gzip recently
because I care very much about that.

> uses of bzip2 anywhere in the kernel so we'd get to drop its code
> completely: 900 lines of Linus' happiness.

Great!

> 
> Other candidates are lzo and bare lzma (you want lz4, zstd or xz instead),
> but those are used elsewhere thus there's hardly any gain.  If you want them
> gone, please say so -- I'll include their droppage.

Yes would be good to remove the kernel image support for those too
just to simplify the config process, even if it doesn't save much code.

-Andi