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

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Date:   Thu, 30 Apr 2020 10:32:17 +0800
From:   changhuaixin <changhuaixin@...ux.alibaba.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     changhuaixin <changhuaixin@...ux.alibaba.com>,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        bp@...en8.de, hpa@...or.com, jpoimboe@...hat.com,
        luto@...capital.net, michal.lkml@...kovi.net, mingo@...hat.com,
        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 Apr 29, 2020, at 4:49 PM, Peter Zijlstra <peterz@...radead.org> 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.
> 
> And what does it add to the build time?

It takes a little more than 7ms to build fast lookup table in sorttable on the same CPU. And it is on the critical path.