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. 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 the tree).
