linux-kernel - Re: [PATCH v2 0/3] Build ORC fast lookup table in scripts/sorttable tool

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Date:   Wed, 19 Aug 2020 11:03:04 +0800
From:   changhuaixin <changhuaixin@...ux.alibaba.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     bp@...en8.de, hpa@...or.com, jpoimboe@...hat.com,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        luto@...capital.net, michal.lkml@...kovi.net, mingo@...hat.com,
        peterz@...radead.org, tglx@...utronix.de, x86@...nel.org,
        yamada.masahiro@...ionext.com
Subject: Re: [PATCH v2 0/3] Build ORC fast lookup table in scripts/sorttable
 tool

Hi，Ingo

This patchset reverts the hacks from patchset v1. Also it includes some other fixes upon v1 as suggested.
Will you please have a look at this?

The previous links are:
https://lore.kernel.org/lkml/20200724135531.GB648324@gmail.com/

Thanks,
huaixin

> On Aug 7, 2020, at 12:17 PM, Huaixin Chang <changhuaixin@...ux.alibaba.com> wrote:
> 
> Move building of fast lookup table from boot to sorttable tool. This saves us
> 6380us boot time on Intel(R) Xeon(R) CPU E5-2682 v4 @ 2.50GHz with cores. It
> adds a little more than 7ms to boot time when testing on the same CPU.
> 
> Changelog v2:
> 1. Write .orc_lookup section header via objtool
> 2. Move two ORC lookup table macro from orc_lookup.h into orc_types.h
> 3. Spell 'ORC' in capitalized fashion
> 
> Huaixin Chang (3):
>  objtool: Write .orc_lookup section header
>  scripts/sorttable: Build ORC fast lookup table via sorttable tool
>  x86/unwind/orc: Simplify unwind_init() for x86 boot
> 
> arch/x86/include/asm/orc_lookup.h      | 16 ------
> arch/x86/include/asm/orc_types.h       | 16 ++++++
> arch/x86/kernel/unwind_orc.c           | 41 +--------------
> arch/x86/kernel/vmlinux.lds.S          |  2 +-
> scripts/sorttable.h                    | 96 +++++++++++++++++++++++++++++++---
> tools/arch/x86/include/asm/orc_types.h | 16 ++++++
> tools/objtool/orc_gen.c                |  4 ++
> 7 files changed, 128 insertions(+), 63 deletions(-)
> 
> -- 
> 2.14.4.44.g2045bb6