linux-kernel - Re: [PATCH 0000/2297] [ANNOUNCE, RFC] "Fast Kernel Headers" Tree -v1: Eliminate the Linux kernel's "Dependency Hell"

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Message-ID: <20220103135400.4p5ezn3ntgpefuan@box.shutemov.name>
Date:   Mon, 3 Jan 2022 16:54:00 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 0000/2297] [ANNOUNCE, RFC] "Fast Kernel Headers" Tree
 -v1: Eliminate the Linux kernel's "Dependency Hell"

On Sun, Jan 02, 2022 at 10:57:35PM +0100, Ingo Molnar wrote:
>  - As to testing & runtime behavior: while all of these patches are 
>    intended to be bug-free, I did find a couple of semi-bugs in the kernel 
>    where a specific order of headers guaranteed a particular code 
>    generation outcome - and if that header order was disturbed, the kernel 
>    would silently break and fail to boot ...

Looks like you are doing a lot of uninlining. Do you see any runtime
performance degradation with the patchset?

-- 
 Kirill A. Shutemov