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

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Message-Id: <F00701B2-F4AD-48B2-9710-33E4CFA5C5AA@linux.alibaba.com>
Date:   Mon, 25 May 2020 11:33:00 +0800
From:   changhuaixin <changhuaixin@...ux.alibaba.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     changhuaixin <changhuaixin@...ux.alibaba.com>,
        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

Thanks for your kindly reply. Let me have a check.

> On May 23, 2020, at 2:28 AM, Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> 
> 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