linux-kernel - Re: [PATCH v2 0/4] Introduce and use absolute

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Message-ID: <CAEdQ38HeUPDyiZhhriHqdA+Qeyrb3M=FoKWKgs0dZaEjbcpVUQ@mail.gmail.com>
Date:   Mon, 20 Sep 2021 11:59:05 -0700
From:   Matt Turner <mattst88@...il.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Ulrich Teichert <krypton@...ich-teichert.org>,
        Michael Cree <mcree@...on.net.nz>,
        Guenter Roeck <linux@...ck-us.net>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        "James E . J . Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        alpha <linux-alpha@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-parisc <linux-parisc@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>,
        Sparse Mailing-list <linux-sparse@...r.kernel.org>
Subject: Re: [PATCH v2 0/4] Introduce and use absolute_pointer macro

On Mon, Sep 20, 2021 at 11:46 AM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Mon, Sep 20, 2021 at 11:26 AM Ulrich Teichert
> <krypton@...ich-teichert.org> wrote:
> >
> > The main trouble is that my system has only 64MB of memory and the smallest
> > kernel image with all drivers I need was about 105MB big.
>
> Are you sure you aren't looking at some debug image?
>
> I just tried building something based on your Jensen config (lots of
> new questions, you sent your old config from 4.18.0-rc5 time), and I
> get
>
>   [torvalds@...en linux]$ ll -h arch/alpha/boot/vmlinux*
>   -rwxr-xr-x. 1 torvalds torvalds 5.4M Sep 20 11:32 arch/alpha/boot/vmlinux
>   -rw-r--r--. 1 torvalds torvalds 2.3M Sep 20 11:32 arch/alpha/boot/vmlinux.gz
>
> so yeah, it's not exactly tiny, but at 5.4MB it's certainly not 105MB.
>
> The "vmlinux" file itself is huge, but that's due to CONFIG_DEBUG_INFO=y.
>
> You can easily disable DEBUG_INFO entirely (or at least do
> DEBUG_INFO_REDUCED), and get much smaller files.
>
> With the attached config, the vmlinux file is just 7MB (but the actual
> one you boot is that same 5.4M file because it's been stripped).
>
> NOTE! The attached config is basically just the one you sent me, with
> "make defconfig" done and DEBUG_INFO removed. It might have drivers
> missing, or extraneous code that you don't need because of all the
> changes in config variables since that very old one.
>
> It would be very interesting to hear whether this all still boots. I
> do think people still occasionally boot-test some other alpha
> configurations, but maybe not.

I test on a couple of alpha configurations with some regularity:
Marvel (AlphaServer ES47) and Nautilus (UP1500). I have more systems I
could test but I'd need to get a lot more organized to make space.

In the decade plus I've been around Linux on alpha I've don't actually
recall hearing of anyone using Linux on a Jensen system before :)