[v2] ARM ZSTD boot compression

[PATCH v2 0/3] ARM ZSTD boot compression

Posted by Andreas Kemnade 4 weeks, 1 day ago

Add ZSTD compression to still have a quite high compression but with
not too much boot delay penality. 

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
---
Changes in v2:
- rebased
- practically rewritten 3/3 (and therefore changed author)
- added more measurements
- Link to v1: https://lore.kernel.org/lkml/ZDoDYh01GYjdwp63@probook/

To: Russell King <linux@armlinux.org.uk>
To: Nick Terrell <terrelln@fb.com>
To: David Sterba <dsterba@suse.com>
To: Nathan Chancellor <nathan@kernel.org>
To: Nick Desaulniers <ndesaulniers@google.com>
To: Bill Wendling <morbo@google.com>
To: Justin Stitt <justinstitt@google.com>
Cc: j.neuschaefer@gmx.net
Cc: f.fainelli@gmail.com
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Tony Lindgren <tony@atomide.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org

---
Andreas Kemnade (1):
      ARM: compressed: Enable ZSTD compression

Jonathan Neuschäfer (2):
      ARM: compressed: Pass the actual output length to the decompressor
      ARM: compressed: Bump MALLOC_SIZE to 128 KiB

 arch/arm/Kconfig                      |  1 +
 arch/arm/boot/compressed/Makefile     |  3 ++-
 arch/arm/boot/compressed/decompress.c | 15 ++++++++++++---
 arch/arm/boot/compressed/head.S       |  4 ++--
 arch/arm/boot/compressed/misc.c       | 10 +++++++++-
 arch/arm/boot/compressed/misc.h       |  3 ++-
 6 files changed, 28 insertions(+), 8 deletions(-)
---
base-commit: 8d3ae59288f1e7d58d76558a6ee96d533bc5019f
change-id: 20260828-zstd2-045ce924f624

Best regards,
--  
Andreas Kemnade <andreas@kemnade.info>

Re: [PATCH v2 0/3] ARM ZSTD boot compression

Posted by Andreas Kemnade 2 weeks ago

On Fri, 28 Aug 2026 22:32:18 +0200
Andreas Kemnade <andreas@kemnade.info> wrote:

> Add ZSTD compression to still have a quite high compression but with
> not too much boot delay penality. 
> 
> Signed-off-by: Andreas Kemnade <andreas@kemnade.info>

Anything left for me to do here?

Regards,
Andreas
> ---
> Changes in v2:
> - rebased
> - practically rewritten 3/3 (and therefore changed author)
> - added more measurements
> - Link to v1: https://lore.kernel.org/lkml/ZDoDYh01GYjdwp63@probook/
> 
> To: Russell King <linux@armlinux.org.uk>
> To: Nick Terrell <terrelln@fb.com>
> To: David Sterba <dsterba@suse.com>
> To: Nathan Chancellor <nathan@kernel.org>
> To: Nick Desaulniers <ndesaulniers@google.com>
> To: Bill Wendling <morbo@google.com>
> To: Justin Stitt <justinstitt@google.com>
> Cc: j.neuschaefer@gmx.net
> Cc: f.fainelli@gmail.com
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: Tony Lindgren <tony@atomide.com>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
> 
> ---
> Andreas Kemnade (1):
>       ARM: compressed: Enable ZSTD compression
> 
> Jonathan Neuschäfer (2):
>       ARM: compressed: Pass the actual output length to the decompressor
>       ARM: compressed: Bump MALLOC_SIZE to 128 KiB
> 
>  arch/arm/Kconfig                      |  1 +
>  arch/arm/boot/compressed/Makefile     |  3 ++-
>  arch/arm/boot/compressed/decompress.c | 15 ++++++++++++---
>  arch/arm/boot/compressed/head.S       |  4 ++--
>  arch/arm/boot/compressed/misc.c       | 10 +++++++++-
>  arch/arm/boot/compressed/misc.h       |  3 ++-
>  6 files changed, 28 insertions(+), 8 deletions(-)
> ---
> base-commit: 8d3ae59288f1e7d58d76558a6ee96d533bc5019f
> change-id: 20260828-zstd2-045ce924f624
> 
> Best regards,
> --  
> Andreas Kemnade <andreas@kemnade.info>
> 
>

Re: [PATCH v2 0/3] ARM ZSTD boot compression

Posted by Linus Walleij 1 week, 6 days ago

Hi Andreas,

On Sat, Sep 12, 2026 at 12:38 PM Andreas Kemnade <andreas@kemnade.info> wrote:
> On Fri, 28 Aug 2026 22:32:18 +0200

> Andreas Kemnade <andreas@kemnade.info> wrote:
>
> > Add ZSTD compression to still have a quite high compression but with
> > not too much boot delay penality.
> >
> > Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
>
> Anything left for me to do here?

I think the patches look good.
Reviewed-by: Linus Walleij <linusw@kernel.org>

Please put them into Russell's patch tracker:
https://www.arm.linux.org.uk/developer/patches/

Yours,
Linus Walleij