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

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Date:   Thu, 26 Nov 2020 01:59:49 +0000
From:   Damien Le Moal <Damien.LeMoal@....com>
To:     "geert@...ux-m68k.org" <geert@...ux-m68k.org>
CC:     "paul.walmsley@...ive.com" <paul.walmsley@...ive.com>,
        "palmer@...belt.com" <palmer@...belt.com>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "aou@...s.berkeley.edu" <aou@...s.berkeley.edu>
Subject: Re: [PATCH] riscv: defconfig: k210: Disable CONFIG_VT

On Wed, 2020-11-25 at 13:47 +0100, Geert Uytterhoeven wrote:
> 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.

Indeed. Good point. Thanks !

> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 

-- 
Damien Le Moal
Western Digital