linux-kernel - Re: [WIP 0/3] Memory model and atomic API in Rust

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Date: Wed, 27 Mar 2024 15:57:12 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: comex <comexk@...il.com>, "Dr. David Alan Gilbert" <dave@...blig.org>, 
	Philipp Stanner <pstanner@...hat.com>, Boqun Feng <boqun.feng@...il.com>, 
	rust-for-linux <rust-for-linux@...r.kernel.org>, linux-kernel@...r.kernel.org, 
	linux-arch@...r.kernel.org, llvm@...ts.linux.dev, 
	Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Wedson Almeida Filho <wedsonaf@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...sung.com>, 
	Alice Ryhl <aliceryhl@...gle.com>, Alan Stern <stern@...land.harvard.edu>, 
	Andrea Parri <parri.andrea@...il.com>, Will Deacon <will@...nel.org>, 
	Peter Zijlstra <peterz@...radead.org>, Nicholas Piggin <npiggin@...il.com>, 
	David Howells <dhowells@...hat.com>, Jade Alglave <j.alglave@....ac.uk>, 
	Luc Maranget <luc.maranget@...ia.fr>, "Paul E. McKenney" <paulmck@...nel.org>, 
	Akira Yokosawa <akiyks@...il.com>, Daniel Lustig <dlustig@...dia.com>, 
	Joel Fernandes <joel@...lfernandes.org>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, kent.overstreet@...il.com, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Marco Elver <elver@...gle.com>, 
	Mark Rutland <mark.rutland@....com>, 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>, Catalin Marinas <catalin.marinas@....com>, 
	linux-arm-kernel@...ts.infradead.org, linux-fsdevel@...r.kernel.org
Subject: Re: [WIP 0/3] Memory model and atomic API in Rust

On Wed, 27 Mar 2024 at 14:41, Kent Overstreet <kent.overstreet@...ux.dev> wrote:
>
>
> On the hardware end, the Mill guys were pointing out years ago that
> register renaming is a big power bottleneck in modern processors;

LOL.

The Mill guys took the arguments from the Itanium people, and turned
the crazy up to 11, with "the belt" and seemingly trying to do a
dataflow machine but not worrying over-much about memory accesses etc.

The whole "we'll deal with it in the compiler" is crazy talk.

In other words, I'll believe it when I see it. And I doubt we'll ever see it.

               Linus