linux-kernel - Re: [PATCH 00/10] objtool: Honey, I shrunk the instruction

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Date:   Thu, 9 Feb 2023 11:57:40 -0800
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, jpoimboe@...hat.com, linux@...ssschuh.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/10] objtool: Honey, I shrunk the instruction

On Wed, Feb 08, 2023 at 06:17:56PM +0100, Peter Zijlstra wrote:
> Hi,
> 
> Boris complained he could no longer build allyesconfig on his 32G desktop
> machine without having OOM terminate either objtool or chrome.
> 
> After talking about these patches on IRC, Nathan mentioned the linux-clang CI
> was also having trouble of recent, and these patches appear to make it happy
> again.
> 
> In total these patches shrink an allyesconfig run by about 6G:
> 
> pre:	5:58.22 real,   226.69 user,    131.22 sys,     26221520 mem
> post:	5:03.34 real,   210.75 user,    88.80 sys,      20241232 mem
> 
> Also at:
> 
>   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/log/?h=objtool/core

For patches 1-9:

Acked-by: Josh Poimboeuf <jpoimboe@...nel.org>

To make the last patch legit we could just have reloc_offset(),
reloc_addend(), reloc_type() helpers to abstract access to rela/rel
fields.

And I'm sure there are other savings we could do to struct reloc, like
single-linked lists, bitfields, etc.

Let me know if you want me to do it.

-- 
Josh