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Message-ID: <CAMuHMdVEO+o0Py3ioC6ohbJooQdMhD9AXTHD1j1y+C_1TqSAAg@mail.gmail.com> Date: Sun, 6 Jul 2025 12:43:50 +0200 From: Geert Uytterhoeven <geert@...ux-m68k.org> To: Daniel Palmer <daniel@...f.com> Cc: linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] m68k: Enable dead code elimination On Sun, 6 Jul 2025 at 11:14, Geert Uytterhoeven <geert@...ux-m68k.org> wrote: > On Wed, 16 Apr 2025 at 13:42, Daniel Palmer <daniel@...f.com> wrote: > > Allow the experimental dead code elimination config to be enabled. > > > > For my 68000 nommu config this frees up a few hundred K of memory > > so seems worth while. > > > > Boot and build tested on nommu and mmu enabled configs. > > > > Before: > > Memory: 5388K/8192K available (1986K kernel code, 114K rwdata, > > 244K rodata, 92K init, 41K bss, 2624K reserved, 0K cma-reserved) > > > > After > > Memory: 5684K/8192K available (1714K kernel code, 112K rwdata, > > 228K rodata, 92K init, 37K bss, 2328K reserved, 0K cma-reserved) > > > > Signed-off-by: Daniel Palmer <daniel@...f.com> > > Thanks for your patch! > > Note that enabling this requires enabling CONFIG_EXPERT first, which is > currently enabled in the Coldfire defconfigs, but not in the Classic > defconfigs. For atari_defconfig, I see a size reduction of ca. 150 KiB > (gcc 13.3.0). Let's share the actual figures I had saved before: $ bloat-o-meter vmlinux-v6.16-rc2+EXPERT{,+LD_DEAD_CODE_DATA_ELIMINATION} add/remove: 0/2125 grow/shrink: 10275/32 up/down: 52254/-205419 (-153165) [...] Total: Before=5277826, After=5124661, chg -2.90% dmesg: -Memory: 265412K/276480K available (4345K kernel code, 486K rwdata, 1240K rodata, 164K init, 143K bss, 10440K reserved, 0K cma-reserved) +Memory: 265616K/276480K available (4205K kernel code, 484K rwdata, 1180K rodata, 160K init, 143K bss, 10236K reserved, 0K cma-reserved) gcc version 13.3.0 (Ubuntu 13.3.0-6ubuntu2~24.04) 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
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