linux-kernel - Re: [PATCH] riscv: defconfig: k210: Disable CONFIG

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Date:   Wed, 25 Nov 2020 13:47:17 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Damien Le Moal <Damien.LeMoal@....com>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] riscv: defconfig: k210: Disable CONFIG_VT

Hi Damien,

On Wed, Nov 25, 2020 at 12:00 PM Damien Le Moal <Damien.LeMoal@....com> wrote:
> On 2020/11/25 18:26, Geert Uytterhoeven wrote:
> > On Wed, Nov 25, 2020 at 10:02 AM Damien Le Moal <Damien.LeMoal@....com> wrote:
> >> On 2020/11/25 17:51, Geert Uytterhoeven wrote:
> >> I was just fiddling with CONFIG_UNIX98_PTYS. Disabling it is OK with the simple
> >> busybox userspace (no telnet/xterm like app running). But it saves only about
> >> 1KB with my toolchain (gcc 9.3). So I left that one enabled. I am surprised that
> >> you see 16K size impact... How big is your image ?
> >>
> >> For me, it is 1.768 MB right now for the sdcard defconfig, with CONFIG_VT
> >> disabled and ext2 enabled.
> >
> > It might depend on how you measure.  "size" says 15 KiB impact for UNIX98
> > ptys, while bloat-o-meter reported less than 7 (my script uses "size").
>
> I look at the size of the arch/riscv/boot/loader.bin file since that is what
> gets loaded in RAM and booted. It is significantly smaller than vmlinux file
> size. E.g. for the sd card defconfig, I have:
>
> vmlinux: 2369920 B
> loader.bin: 1751250 B

Doesn't loader.bin lack bss?
Bss does consume RAM, so you do want to take that into account, too.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds