linux-kernel - Re: Linux kernel in-tree Rust support

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Message-ID: <20201217214506.GD28574@duo.ucw.cz>
Date:   Thu, 17 Dec 2020 22:45:06 +0100
From:   Pavel Machek <pavel@....cz>
To:     Josh Triplett <josh@...htriplett.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        alex.gaynor@...il.com, Greg KH <gregkh@...uxfoundation.org>,
        geofft@...reload.com, jbaublitz@...hat.com,
        Masahiro Yamada <masahiroy@...nel.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: Linux kernel in-tree Rust support

On Tue 2020-07-28 23:34:17, Josh Triplett wrote:
> On Tue, Jul 28, 2020 at 10:40:38PM +0200, Pavel Machek wrote:
> > > We just need to make sure that any kernel CI infrastructure tests that
> > > right away, then, so that failures don't get introduced by a patch from
> > > someone without a Rust toolchain and not noticed until someone with a
> > > Rust toolchain tests it.
> > 
> > So... I'm fan of Rust, but while trying to use it one thing was obvious: it
> > takes _significantly_ longer than C to compile and needs gigabyte a lot of RAM.
> > 
> > Kernel is quite big project, can CI infrastructure handle additional load?
> > 
> > Will developers see significantly longer compile times when Rust is widespread?
> 
> I wouldn't expect the addition of Rust to the kernel to substantially
> impact overall build time; on balance, I'd expect the major bottleneck
> in kernel builds to continue to be linking and other serialized steps,
> not compiling and other highly parallel steps.

Well.. not everyone has 32 cores in their notebook.

> There are also *many* things that can be done to improve Rust build time
> in a project. And I don't expect that in-kernel Rust will have many
> dependencies on third-party crates (since they'd need to be checked into

Okay. I did some refactoring recently and I really wished kernel was
in Rust (and not in C)... so lets see what happens.

Best regards,

  	       	  	      	     	    	   	      	      Pavel
-- 
http://www.livejournal.com/~pavelmachek

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