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

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Date:   Fri,  7 Aug 2020 12:17:59 +0800
From:   Huaixin Chang <changhuaixin@...ux.alibaba.com>
To:     changhuaixin@...ux.alibaba.com
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: [PATCH v2 0/3] Build ORC fast lookup table in scripts/sorttable tool

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