WIP cargo dev bless for x.py (on my own Rust checkout) #1
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Before, `clippy_project_root` worked by ascending the path from the build directory. This worked as long as it was executed from the Clippy checkout as the Clippy build directory is part of the Clippy checkout. It didn't work when executed from the rust checkout because the Rust build directory is at `./rust/build/` which doesn't have the Clippy project at in the ancestors. The solution to make the function behave the same in the Rust checkout, is to ascend from the `CARGO_MANIFEST_DIR` instead. This commit passed Clippy CI: rust-lang/rust-clippy#6512
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bypass auto_da_alloc for metadata files This saves about 0.7% when rerunning the UI test suite. I.e. when the metadata files exist and will be overwritten. No improvements expected for a clean build. So it might show up in incr-patched perf results. ``` regular rename: Benchmark #1: touch src/tools/compiletest/src/main.rs ; RUSTC_WRAPPER="" schedtool -B -e ./x.py test src/test/ui Time (mean ± σ): 47.305 s ± 0.170 s [User: 1631.540 s, System: 412.648 s] Range (min … max): 47.125 s … 47.856 s 20 runs non-durable rename: Benchmark #1: touch src/tools/compiletest/src/main.rs ; RUSTC_WRAPPER="" schedtool -B -e ./x.py test src/test/ui Time (mean ± σ): 46.930 s ± 0.064 s [User: 1634.344 s, System: 396.038 s] Range (min … max): 46.759 s … 47.043 s 20 runs ``` There are more places that trigger auto_da_alloc behavior by overwriting existing files with O_TRUNC, but those are much harder to locate because `O_TRUNC` is set on `open()` but the writeback is triggered on `close()`. The latter is the part which shows up in profiles.
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