linux-kernel - Re: [PATCH v9 04/10] x86: refcount: prevent gcc distortions

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Message-ID: <8762567F-AF91-4D51-AEAD-4F4A18E59F8E@vmware.com>
Date:   Mon, 8 Oct 2018 02:17:09 +0000
From:   Nadav Amit <namit@...are.com>
To:     Ingo Molnar <mingo@...nel.org>
CC:     "hpa@...or.com" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jan Beulich <JBeulich@...e.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH v9 04/10] x86: refcount: prevent gcc distortions

at 2:31 AM, Ingo Molnar <mingo@...nel.org> wrote:

> 
> * Nadav Amit <namit@...are.com> wrote:
> 
>>> Are you using defconfig or a reasonable distro-config for your tests?
>> 
>> I think it is best to take the kernel and run localyesconfig for testing.
> 
> Ok, agreed - and this makes the numbers you provided pretty representative.
> 
> Good - now that all of my concerns were addressed I'd like to merge the remaining 3 patches as 
> well - but they are conflicting with ongoing x86 work in tip:x86/core. The extable conflict is 
> trivial, the jump-label conflict a bit more involved.
> 
> Could you please pick up the updated changelogs below and resolve the conflicts against 
> tip:master or tip:x86/build and submit the remaining patches as well?

For the record, I summarized my analysis of the poor function inlining
decisions in Linux in the following blog-post:

https://nadav.amit.zone/blog/linux-inline

Regards,
Nadav