From: Peter Zijlstra <peterz@infradead.org>
To: shile.zhang@linux.alibaba.com
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>,
Michal Marek <michal.lkml@markovi.net>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Josh Poimboeuf <jpoimboe@redhat.com>,
x86@kernel.org, "H . Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org
Subject: Re: [RFC PATCH 0/4] Speed booting by sorting ORC unwind tables at build time
Date: Thu, 7 Nov 2019 16:22:44 +0100 [thread overview]
Message-ID: <20191107152244.GD4114@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20191107143205.206606-1-shile.zhang@linux.alibaba.com>
On Thu, Nov 07, 2019 at 10:32:01PM +0800, shile.zhang@linux.alibaba.com wrote:
> From: Shile Zhang <shile.zhang@linux.alibaba.com>
>
> Hi,
>
> I found the unwind_init taken long time (more than 90ms) in kernel
> booting, mainly spent on sorting the two ORC unwind tables, orc_unwind
> and orc_unwind_ip.
>
> I also noticed that this issued has reported and discussed last year:
> https://lkml.org/lkml/2018/10/8/342
> But seems no final solution until now, I tried to sort the ORC tables at
> build time, followed the helpful hints from Josh and Ingo in that thread.
> And mainly referred the implementation of 'sortextable' tool:
> https://lore.kernel.org/linux-mips/1334872799-14589-1-git-send-email-ddaney.cavm@gmail.com/
>
> What I did:
>
> - Add a Kconfig to control build-time sorting or runtime sorting;
> - Referred 'sortextable', create a similar helper tool 'sortorctable',
> help to sort the ORC unwind tables at vmlinux link process.
What is the build-time cost for doing this? The link phase is already a
fairly big bottleneck for building a kernel.
Can sort{ex,orc}table() be ran concurrently? Do they want to be the same
(threaded) tool?
next prev parent reply other threads:[~2019-11-07 15:23 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-07 14:32 [RFC PATCH 0/4] Speed booting by sorting ORC unwind tables at build time shile.zhang
2019-11-07 14:32 ` [RFC PATCH 1/4] scripts: Add sortorctable to sort ORC unwind tables shile.zhang
2019-11-07 14:32 ` [RFC PATCH 2/4] kbuild: Sort ORC unwind tables in vmlinux link process shile.zhang
2019-11-07 14:32 ` [RFC PATCH 3/4] x86/unwind/orc: Skip sorting if BUILDTIME_ORCTABLE_SORT is configured shile.zhang
2019-11-07 14:32 ` [RFC PATCH 4/4] x86/Kconfig: Add a Kconfig option to sort ORC tables at build time shile.zhang
2019-11-07 15:22 ` Peter Zijlstra [this message]
2019-11-08 1:42 ` [RFC PATCH 0/4] Speed booting by sorting ORC unwind " Shile Zhang
2019-11-08 9:21 ` Peter Zijlstra
2019-11-08 9:25 ` Peter Zijlstra
2019-11-11 2:44 ` Shile Zhang
2019-11-07 15:46 ` Josh Poimboeuf
2019-11-08 1:43 ` Shile Zhang
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