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

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Date:   Thu, 23 Jul 2020 11:46:40 +0800
From:   Huaixin Chang <changhuaixin@...ux.alibaba.com>
To:     jpoimboe@...hat.com
Cc:     bp@...en8.de, changhuaixin@...ux.alibaba.com, hpa@...or.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 RESEND 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.

Kernel initialization unwind_init() cannot be removed because lookup_num_blocks
is still needed.

Huaixin Chang (3):
  scripts/sorttable: Change section type of orc_lookup to SHT_PROGBITS
  scripts/sorttable: Build orc fast lookup table via sorttable tool
  x86/unwind/orc: Simplify unwind_init() for x86 boot

 arch/x86/kernel/unwind_orc.c      | 41 +---------------
 include/asm-generic/vmlinux.lds.h |  2 +
 scripts/sorttable.h               | 99 ++++++++++++++++++++++++++++++++++++---
 3 files changed, 96 insertions(+), 46 deletions(-)

-- 
2.14.4.44.g2045bb6