linux-kernel - Re: [PATCH v2 1/6] Add AutoFDO support for Clang build

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Message-ID: <20241003160309.GY5594@noisy.programming.kicks-ass.net>
Date: Thu, 3 Oct 2024 18:03:09 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Rong Xu <xur@...gle.com>, Han Shen <shenhan@...gle.com>,
	Sriraman Tallam <tmsriram@...gle.com>,
	David Li <davidxl@...gle.com>,
	Krzysztof Pszeniczny <kpszeniczny@...gle.com>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>, Bill Wendling <morbo@...gle.com>,
	Borislav Petkov <bp@...en8.de>, Breno Leitao <leitao@...ian.org>,
	Brian Gerst <brgerst@...il.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Juergen Gross <jgross@...e.com>,
	Justin Stitt <justinstitt@...gle.com>, Kees Cook <kees@...nel.org>,
	linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev, Masahiro Yamada <masahiroy@...nel.org>,
	"Mike Rapoport (IBM)" <rppt@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Samuel Holland <samuel.holland@...ive.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Wei Yang <richard.weiyang@...il.com>, workflows@...r.kernel.org,
	x86@...nel.org, "Xin Li (Intel)" <xin@...or.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v2 1/6] Add AutoFDO support for Clang build

On Thu, Oct 03, 2024 at 08:51:51AM -0700, Nick Desaulniers wrote:
> On Thu, Oct 3, 2024 at 8:42 AM Peter Zijlstra <peterz@...radead.org> wrote:
> >
> > On Wed, Oct 02, 2024 at 04:34:00PM -0700, Rong Xu wrote:
> > > +6) Rebuild the kernel using the AutoFDO profile file with the same config as step 1,
> > > +    (Note CONFIG_AUTOFDO_CLANG needs to be enabled):
> > > +
> > > +      .. code-block:: sh
> > > +
> > > +         $ make LLVM=1 CLANG_AUTOFDO_PROFILE=<profile_file
> > > +
> >
> >
> > Can this be done without the endless ... code-block nonsense?
> 
> Dunno, I think it looks pretty nice once rendered. Makes it

It makes it absolute crap for all of us who 'render' text documents
using less or vi.