linux-kernel - Re: [PATCH 6/6] Add Propeller configuration for kernel build.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240729095303.GD37996@noisy.programming.kicks-ass.net>
Date: Mon, 29 Jul 2024 11:53:03 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Rong Xu <xur@...gle.com>
Cc: Han Shen <shenhan@...gle.com>, Sriraman Tallam <tmsriram@...gle.com>,
	David Li <davidxl@...gle.com>, Jonathan Corbet <corbet@....net>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H . Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
	Arnd Bergmann <arnd@...db.de>, Josh Poimboeuf <jpoimboe@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Vegard Nossum <vegard.nossum@...cle.com>,
	John Moon <john@...on.dev>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Samuel Holland <samuel.holland@...ive.com>,
	Mike Rapoport <rppt@...nel.org>,
	"Paul E . McKenney" <paulmck@...nel.org>,
	Rafael Aquini <aquini@...hat.com>, Petr Pavlu <petr.pavlu@...e.com>,
	Eric DeVolder <eric.devolder@...cle.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Benjamin Segall <bsegall@...gle.com>,
	Breno Leitao <leitao@...ian.org>,
	Wei Yang <richard.weiyang@...il.com>,
	Brian Gerst <brgerst@...il.com>, Juergen Gross <jgross@...e.com>,
	Palmer Dabbelt <palmer@...osinc.com>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	Kees Cook <kees@...nel.org>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	Xiao Wang <xiao.w.wang@...el.com>,
	Jan Kiszka <jan.kiszka@...mens.com>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
	linux-efi@...r.kernel.org, linux-arch@...r.kernel.org,
	llvm@...ts.linux.dev, Krzysztof Pszeniczny <kpszeniczny@...gle.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 6/6] Add Propeller configuration for kernel build.

On Sun, Jul 28, 2024 at 01:29:59PM -0700, Rong Xu wrote:
> Add the build support for using Clang's Propeller optimizer. Like
> AutoFDO, Propeller uses hardware sampling to gather information
> about the frequency of execution of different code paths within a
> binary. This information is then used to guide the compiler's
> optimization decisions, resulting in a more efficient binary.
> 
> The support requires a Clang compiler LLVM 19 or later, and the
> create_llvm_prof tool
> (https://github.com/google/autofdo/releases/tag/v0.30.1). This

What's the relation between this and llvm-profgen? Is the above simply
a google 'internal' proof of concept thing that will eventually make its
way into llvm-profgen?

It seems a bit weird LLVM landed propeller without the required profile
generation tool.