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From:   Norbert Lange <nolange79@gmail.com>
Date:   Fri, 3 Jul 2020 19:36:45 +0200
Message-ID: <CADYdroMqpTM105UZy+CJ3VOu8Ahgonb4JEMCEt3D4+hP92A6xA@mail.gmail.com>
Subject: Re: Kernel compression benchmarks
To:     Kees Cook <keescook@chromium.org>
Cc:     Nick Terrell <nickrterrell@gmail.com>,
        Nick Terrell <terrelln@fb.com>,
        Sedat Dilek <sedat.dilek@gmail.com>,
        "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Chris Mason <clm@fb.com>, linux-kbuild@vger.kernel.org,
        x86@kernel.org, gregkh@linuxfoundation.org,
        Petr Malat <oss@malat.biz>, Kernel Team <Kernel-team@fb.com>,
        Adam Borowski <kilobyte@angband.pl>,
        Patrick Williams <patrickw3@fb.com>, rmikey@fb.com,
        mingo@kernel.org, Patrick Williams <patrick@stwcx.xyz>
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Am Fr., 3. Juli 2020 um 18:06 Uhr schrieb Kees Cook <keescook@chromium.org>:
>
> On Fri, Jul 03, 2020 at 10:15:20AM +0200, Sedat Dilek wrote:
> > On Thu, Jul 2, 2020 at 5:18 PM Kees Cook <keescook@chromium.org> wrote:
> > >
> > > On Wed, Jul 01, 2020 at 10:35:48AM -0400, Alex Xu (Hello71) wrote:
> > > > ZSTD compression patches have been sent in a number of times over the
> > > > past few years. Every time, someone asks for benchmarks. Every time,
> > > > someone is concerned about compression time. Sometimes, someone provides
> > > > benchmarks.
> > >
> > > Where's the latest series for this, btw? I thought it had landed. :P It
> > > seemed like it was done.
> > >
> >
> > Hi,
> >
> > Again, I would like to see this upstream, too.
> >
> > Last I asked for a rebase against Linux v5.8-rc1 or later.
> >
> > Beyond above adaptations, the latest series "zstd-v5" of Nick T.s
> > patchset needs some addition of zstd to the patch (see [1]):
> >
> > commit 8dfb61dcbaceb19a5ded5e9c9dcf8d05acc32294
> > "kbuild: add variables for compression tools"
> >
> > NOTE:
> > "zstd-v5" was against Linux-next 20200408 or download the series from
> > patchwork LKML which applies cleanly against Linux v5.7 - last is what
> > I did.
> >
> > There was a follow-up to the above patch (see [2]):
> >
> > commit e4a42c82e943b97ce124539fcd7a47445b43fa0d
> > "kbuild: fix broken builds because of GZIP,BZIP2,LZOP variables"
>
> Okay, cool. Yes, now is the right time to send an updated series based
> on v5.8-rc2 with any outstanding adjusted/fixes made.
>
> It seems v5 is here?
> https://lore.kernel.org/lkml/20200408215711.137639-1-nickrterrell@gmail.com/
>
> That wasn't sent "to" a maintainer, so it likely went unnoticed by either
> akpm or the x86 maintainers. I think this should likely go via the x86
> tree.
>
> > Nevertheless, this is the kernel-side of doing - user-space like for
> > example Debian's initramfs-tools needs adaptations (see [3]).
>
> Right, but the kernel needs to implement the support first. :)
>
> > @Kees: Can you aid Nick T. to get this upstream? You know the
> > processes a bit better than me.
>
> Sure; Nick, can you please rebase and handle any issues from v5? With
> the result, send a v6 as you did for v5 before, but I would make your
> "to" be:
>
> Borislav Petkov <bp@alien8.de>
> Thomas Gleixner <tglx@linutronix.de>

I got the hint to bring in Andrew Morton <akpm@linux-foundation.org> [1],
so you might add him aswell (he signded-off changes in lib/decompress*.c).

Norbert

https://lwn.net/ml/linux-kernel/CADYdroP0zdz=QtuDFCXpkDohEAgGOc7hDHT8_NnqKuvi979J5Q@mail.gmail.com/

>
> and keep the CC as you had it.
>
> --
> Kees Cook