linux-kernel - Re: [PATCH 0/2] Build ORC fast lookup table in scripts/sorttable tool

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Message-ID: <20200522182815.ezanmvbemhzq2fmm@treble>
Date:   Fri, 22 May 2020 13:28:15 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Huaixin Chang <changhuaixin@...ux.alibaba.com>
Cc:     linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        bp@...en8.de, hpa@...or.com, 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 0/2] Build ORC fast lookup table in scripts/sorttable tool

On Wed, Apr 29, 2020 at 02:46:24PM +0800, Huaixin Chang 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.
> 
> Huaixin Chang (2):
>   scripts/sorttable: Build orc fast lookup table via sorttable tool
>   x86/unwind/orc: Remove unwind_init() from x86 boot
> 
>  arch/x86/include/asm/unwind.h |  2 -
>  arch/x86/kernel/setup.c       |  2 -
>  arch/x86/kernel/unwind_orc.c  | 51 ----------------------
>  scripts/sorttable.h           | 99 ++++++++++++++++++++++++++++++++++++++++---
>  4 files changed, 92 insertions(+), 62 deletions(-)

I tested this (rebased on tip/master), it seems to break ORC
completely... e.g. /proc/self/stack is empty.

-- 
Josh