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A comment on Rust in Linux kernel is just a beginning. Parent comment

Re:Rust in Linux kernel is just a beginning by raverbashing on Tuesday October 25, 2022 @03:55AM (#33327488)
I think it's more related to the grammatical complexity of the language than to safety itself

(Same reason why C with typedefs is slower to compile than plain C, why C++ is slower, etc)

(that and cargo dependencies, etc - also C compilers have some +30yrs of optimizations)

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Re:Rust in Linux kernel is just a beginning by akira2501 on Tuesday October 25, 2022 @04:25AM (#33327732)
I've seen some Rust programs that look nice, but in the kernel, the code ends up making perl'ls propensity for line noise look competitive. I'm sure some of that is the need to shovel between languages, but it does make you wonder if the entire effort is a little misguided.

A full Rust kernel might be neat. A compromised Rust driver inside of a C kernel is never going to be the default choice.

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Re:Rust in Linux kernel is just a beginning by bonzini on Tuesday October 25, 2022 @05:17AM (#33328135)
Most of the code committed to the kernel is infrastructure for C<->Rust interoperability. It's the least readable of it all, and as fun to work on as watching paint dry.

The actual driver code is pretty readable, see https://lwn.net/Articles/863459/.

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Re:Rust in Linux kernel is just a beginning by coldacid on Tuesday October 25, 2022 @11:39AM (#33332073)
>A full Rust kernel might be neat.

May I interest you in Redox? https://www.redox-os.org/

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Re:Rust in Linux kernel is just a beginning by steveklabnik on Tuesday October 25, 2022 @02:19PM (#33334266)
If "embedded OS" counts as "full Rust kernel", you may want to check out https://hubris.oxide.computer/

Obviously very different than Linux.

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Re:Rust in Linux kernel is just a beginning by WastingMyTime89 on Tuesday October 25, 2022 @06:10AM (#33328489)
More complexe languages are faster to compile. The issue is mostly the implementation. It could, should and will be better but it takes time.
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Re:Rust in Linux kernel is just a beginning by api on Tuesday October 25, 2022 @07:39AM (#33329171)
As others have pointed out most of the performance hit is in the optimization of the relatively verbose IR code the Rust compiler sends to LLVM, not the Rust compiler itself.

There's been multiple passes at making the Rust compiler faster. It'll happen. There's a GCC-based Rust implementation in the works too.

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