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Rollup merge of rust-lang#65094 - oxalica:linux-statx, r=alexcrichton
Prefer statx on linux if available This PR make `metadata`-related functions try to invoke `statx` first on Linux if available, making `std::fs::Metadata::created` work on Linux with `statx` supported. It follows the discussion in rust-lang#61386 , and will fix rust-lang#59743 The implementation of this PR is simply converting `struct statx` into `struct stat64` with extra fields for `btime` if `statx` succeeds, since other fields are not currently used. --- I also did a separated benchmark for `fs::metadata`, `stat64`, `statx`, and `statx` with conversion to `stat64`. It shows that `statx` with conversion is even more faster than pure `statx`. I think it's due to `sizeof stat64 == 114` but `sizeof statx == 256`. Anyway, the bare implementation of `statx` with conversion is only about 0.2% slower than the original impl (`stat64`-family). With heap-allocation counted (~8.5% of total cost), the difference between `stat` and `statx` (with or without conversion) is just nothing. Therefore, I think it is not urgent to use bare `struct statx` as underlying representation now. There is no need to break `std::os::linux::fs::MetadataExt::as_raw_stat` (rust-lang#61386 (comment)) [Separated bare benchmarks](https://gist.github.com/oxalica/c4073ecb202c599fe41b7f15f86dc79c): ``` metadata_ok time: [529.41 ns 529.77 ns 530.19 ns] metadata_err time: [538.71 ns 539.39 ns 540.35 ns] stat64_ok time: [484.32 ns 484.53 ns 484.75 ns] stat64_err time: [481.77 ns 482.00 ns 482.24 ns] statx_ok time: [488.07 ns 488.35 ns 488.62 ns] statx_err time: [487.74 ns 488.00 ns 488.27 ns] statx_cvt_ok time: [485.05 ns 485.28 ns 485.53 ns] statx_cvt_err time: [485.23 ns 485.45 ns 485.67 ns] ``` r? @alexcrichton
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