Linus Torvalds' Initial Comment On Rust Code Prospects Within The Linux Kernel

Ok, but how is the code written in Rust compared to C at the performance level ?
Is Rust adding any safety checks at runtime that makes the code slower based on the assumption that the code is badly written ?

Rust's safety checks are statically analyzed. Compilation time is a bit slower, but there aren't runtime checks. Features involving dynamic casting are always expensive, whether written manually or supported by language.

[p91paul]

and nothing works, that's why nothing but c++ is used as viable replacement for c
i didn't say "call c code", i said "understand c headers". even perl can "call c code"

A quick Google lookup will teach you that Rust bindgen *understands C headers* and generates Rust bindings from that.

[Danny3]

Ok, but how is the code written in Rust compared to C at the performance level ?
Is Rust adding any safety checks at runtime that makes the code slower based on the assumption that the code is badly written ?

[pal666]

There are multiple solutions for this in many languages.

and nothing works, that's why nothing but c++ is used as viable replacement for c

In Rust, one could use bindgen to generate Rust FFI and you then call C code from that

i didn't say "call c code", i said "understand c headers". even perl can "call c code"

[CommunityMember]

As long it's not a requirement to have rust compiler installed, to be able to properly build mainline kernel, guessing it's OK.

It seems likely any early usage of rust would be in specific use cases such as a new driver which might very well not be built by default (so no rustc requirements). But, remember, you are the frog (and the water is slowing getting hotter).

[onicsis]

As long it's not a requirement to have rust compiler installed, to be able to properly build mainline kernel, guessing it's OK.

[RahulSundaram]

viable c replacement has to understand c headers

Not necessarily but it does make it easier to replace incrementally. There are multiple solutions for this in many languages. In Rust, one could use bindgen to generate Rust FFI and you then call C code from that

[pal666]

It might evolve into a viable C replacement.

viable c replacement has to understand c headers

[pal666]

well, it has to be disabled by default because gcc 4.9 doesn't support it

[dxin]

This is getting interesting. I guess it's finally time for me to learn a new language.