linux-kernel - Re: [RFC PATCH v3 0/7] Speed booting by sorting ORC unwind tables at build time

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Message-ID: <20191115072511.GA114447@gmail.com>
Date:   Fri, 15 Nov 2019 08:25:11 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Shile Zhang <shile.zhang@...ux.alibaba.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: [RFC PATCH v3 0/7] Speed booting by sorting ORC unwind tables at
 build time


* Shile Zhang <shile.zhang@...ux.alibaba.com> wrote:

> Hi,
> 
> I refactored the sortextable code and add ORC unwind tables sort
> support, for kernel boot speedup by sorting kernel tables at build time
> as much as possible.
> 
> Followed Peter's suggestion, I put ORC tables sort into a separated
> thread makes these tables sort concurrently. That helps to avoid
> kernel's link time as possible.

Could you please also measure how much boot time this saves, 
approximately, and how long it takes to do it at build time?

Thanks,

	Ingo